Why is it possible to flip the screen?











up vote
16
down vote

favorite
2












My friend running Ubuntu just called me saying: "my screen got flipped, how to fix it?"



I told him how to fix it but that raises the question, why is it possible to flip the screen? On Linux you could flip the screen, on windows you could make it rotate sideways.



I can't think of any reason that would make the feature useful, if you want to rotate a picture you could do that in the image viewer.



What type of users flip their Linux or Windows screens? For whom is this feature created?










share|improve this question




















  • 38




    It's necessary for users ɐıʃɐɹʇsn∀ uı
    – bmargulies
    11 hours ago






  • 9




    I was reading color inversion until I arrived at the words rotate sideways.
    – Chris
    8 hours ago






  • 2




    A much harder question: Why is this part of the OS, and not part of the display? I'd guess this goes back to VGA or earlier.
    – Peter
    7 hours ago










  • This is very handy with projectors.
    – TLW
    4 hours ago






  • 1




    @Peter - because not all displays have this feature, and having this feature in both your monitor and your OS doesn't hurt anything, whereas having this feature in neither is inconvenient if you need it.
    – TLW
    4 hours ago















up vote
16
down vote

favorite
2












My friend running Ubuntu just called me saying: "my screen got flipped, how to fix it?"



I told him how to fix it but that raises the question, why is it possible to flip the screen? On Linux you could flip the screen, on windows you could make it rotate sideways.



I can't think of any reason that would make the feature useful, if you want to rotate a picture you could do that in the image viewer.



What type of users flip their Linux or Windows screens? For whom is this feature created?










share|improve this question




















  • 38




    It's necessary for users ɐıʃɐɹʇsn∀ uı
    – bmargulies
    11 hours ago






  • 9




    I was reading color inversion until I arrived at the words rotate sideways.
    – Chris
    8 hours ago






  • 2




    A much harder question: Why is this part of the OS, and not part of the display? I'd guess this goes back to VGA or earlier.
    – Peter
    7 hours ago










  • This is very handy with projectors.
    – TLW
    4 hours ago






  • 1




    @Peter - because not all displays have this feature, and having this feature in both your monitor and your OS doesn't hurt anything, whereas having this feature in neither is inconvenient if you need it.
    – TLW
    4 hours ago













up vote
16
down vote

favorite
2









up vote
16
down vote

favorite
2






2





My friend running Ubuntu just called me saying: "my screen got flipped, how to fix it?"



I told him how to fix it but that raises the question, why is it possible to flip the screen? On Linux you could flip the screen, on windows you could make it rotate sideways.



I can't think of any reason that would make the feature useful, if you want to rotate a picture you could do that in the image viewer.



What type of users flip their Linux or Windows screens? For whom is this feature created?










share|improve this question















My friend running Ubuntu just called me saying: "my screen got flipped, how to fix it?"



I told him how to fix it but that raises the question, why is it possible to flip the screen? On Linux you could flip the screen, on windows you could make it rotate sideways.



I can't think of any reason that would make the feature useful, if you want to rotate a picture you could do that in the image viewer.



What type of users flip their Linux or Windows screens? For whom is this feature created?







linux ubuntu display






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 20 mins ago









Alexander Revo

2,9832813




2,9832813










asked 19 hours ago









Lynob

1,584133269




1,584133269








  • 38




    It's necessary for users ɐıʃɐɹʇsn∀ uı
    – bmargulies
    11 hours ago






  • 9




    I was reading color inversion until I arrived at the words rotate sideways.
    – Chris
    8 hours ago






  • 2




    A much harder question: Why is this part of the OS, and not part of the display? I'd guess this goes back to VGA or earlier.
    – Peter
    7 hours ago










  • This is very handy with projectors.
    – TLW
    4 hours ago






  • 1




    @Peter - because not all displays have this feature, and having this feature in both your monitor and your OS doesn't hurt anything, whereas having this feature in neither is inconvenient if you need it.
    – TLW
    4 hours ago














  • 38




    It's necessary for users ɐıʃɐɹʇsn∀ uı
    – bmargulies
    11 hours ago






  • 9




    I was reading color inversion until I arrived at the words rotate sideways.
    – Chris
    8 hours ago






  • 2




    A much harder question: Why is this part of the OS, and not part of the display? I'd guess this goes back to VGA or earlier.
    – Peter
    7 hours ago










  • This is very handy with projectors.
    – TLW
    4 hours ago






  • 1




    @Peter - because not all displays have this feature, and having this feature in both your monitor and your OS doesn't hurt anything, whereas having this feature in neither is inconvenient if you need it.
    – TLW
    4 hours ago








38




38




It's necessary for users ɐıʃɐɹʇsn∀ uı
– bmargulies
11 hours ago




It's necessary for users ɐıʃɐɹʇsn∀ uı
– bmargulies
11 hours ago




9




9




I was reading color inversion until I arrived at the words rotate sideways.
– Chris
8 hours ago




I was reading color inversion until I arrived at the words rotate sideways.
– Chris
8 hours ago




2




2




A much harder question: Why is this part of the OS, and not part of the display? I'd guess this goes back to VGA or earlier.
– Peter
7 hours ago




A much harder question: Why is this part of the OS, and not part of the display? I'd guess this goes back to VGA or earlier.
– Peter
7 hours ago












This is very handy with projectors.
– TLW
4 hours ago




This is very handy with projectors.
– TLW
4 hours ago




1




1




@Peter - because not all displays have this feature, and having this feature in both your monitor and your OS doesn't hurt anything, whereas having this feature in neither is inconvenient if you need it.
– TLW
4 hours ago




@Peter - because not all displays have this feature, and having this feature in both your monitor and your OS doesn't hurt anything, whereas having this feature in neither is inconvenient if you need it.
– TLW
4 hours ago










5 Answers
5






active

oldest

votes

















up vote
31
down vote



accepted










One common case where you'd want to turn your screen upside down is if you have a laptop doubling as a tablet computer, like this:



Leonovo Yoga in tablet mode



Another common case is if you attach a projector to the roof instead of letting it stand on a table.






share|improve this answer





















  • I would have thought that an inverted screen on a tablet computer is a feature, not something that needs to be fixed as noted in the question. The projector aspect is one I hadn't thought of, yet had to use during an assist at the library! Dying brain cells.
    – fred_dot_u
    13 hours ago










  • The thing with the computer is that you need to be able to turn the screen depending on what mode you're using it in. One way in ordinary laptop mode. Another in this tablet mode. You can see that the text "Lenovo" is upside down because of it.
    – user.S
    13 hours ago






  • 6




    You can also bounce a projector off a mirror, which requires the projector or OS to support displaying a mirror image. I've done this for back-projection in tight spaces.
    – Chris H
    10 hours ago






  • 3




    To be fair this has been a feature of e.g. nVidia drivers since long before anybody used a desktop OS on/as a tablet.
    – Lightness Races in Orbit
    9 hours ago






  • 1




    @AustinHemmelgarn Yes, it was just an example ("e.g." means "for example"). I was thinking of the old little proprietary control panel you'd get that you could use to flip the screen around aaaages ago, but yes my whole point is that this is not in any way a new technology. The whole tablet thing is very new by comparison.
    – Lightness Races in Orbit
    4 hours ago




















up vote
22
down vote













One can envision a circumstance in which the display mounting and associated brackets can only permit an inverted attachment of the panel. A kiosk with limited access may be one example, a display unit mounted at ceiling height with a mounting bracket that cannot be attached unless upside down.



In the case of a laptop, I can picture a situation in which the keyboard is mounted inside a box with the display extending outside the enclosure which would require to invert the image for viewing in a normal orientation.



I expect there are other circumstances in which this applies.






share|improve this answer




























    up vote
    19
    down vote













    Addressing the sideways rotation part of the question, the main time I've done so is when I've wanted to see many lines of content at once, e.g. a long file of code, a terminal output, or a spreadsheet. Some desktop monitors (e.g. this one) have a stand that rotates by 90°, but the software needs to rotate the video output too, otherwise everything becomes harder to read.






    share|improve this answer



















    • 3




      +1 for addressing sideways rotation; back before 27" monitors were the norm my favored workspace setup was two 23" monitors, one rotated sideways and off to the side for viewing documentation while the standard orientation was my main screen for doing work.
      – fluffy
      10 hours ago






    • 1




      Wow that's so smart
      – Lynob
      9 hours ago






    • 1




      @Lynob This concept has actually been around for almost half a century. The original Xerox Alto systems (the first computers with a graphical interface) used a screen in a portrait orientation like this because they were designed specifically for document processing. The use of a landscape orientation came about largely for viewing videos, and has largely stuck around because displaying a 16:9 video on a 9:16 screen wastes a huge amount of space.
      – Austin Hemmelgarn
      4 hours ago


















    up vote
    6
    down vote













    Many restaurants show their menus on rotated screen (portrait mode); same for airports Departure and Arrival lists. Newer ones are simple oversize screens with 90 degree rotated display.



    Others have already mentioned reasons for mirroring (projecting via a mirror to fold the distance needed; or back-projecting), and for 180 degree rotations (set-up tablets, etc.)






    share|improve this answer




























      up vote
      1
      down vote













      I know probably not many do this, but for some time that I had my desktop monitor close to where my head's at in bed, I would rotate the screen so I could read or watch a movie while laying on my side. I've also done that with my laptop a few times.






      share|improve this answer





















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        5 Answers
        5






        active

        oldest

        votes








        5 Answers
        5






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes








        up vote
        31
        down vote



        accepted










        One common case where you'd want to turn your screen upside down is if you have a laptop doubling as a tablet computer, like this:



        Leonovo Yoga in tablet mode



        Another common case is if you attach a projector to the roof instead of letting it stand on a table.






        share|improve this answer





















        • I would have thought that an inverted screen on a tablet computer is a feature, not something that needs to be fixed as noted in the question. The projector aspect is one I hadn't thought of, yet had to use during an assist at the library! Dying brain cells.
          – fred_dot_u
          13 hours ago










        • The thing with the computer is that you need to be able to turn the screen depending on what mode you're using it in. One way in ordinary laptop mode. Another in this tablet mode. You can see that the text "Lenovo" is upside down because of it.
          – user.S
          13 hours ago






        • 6




          You can also bounce a projector off a mirror, which requires the projector or OS to support displaying a mirror image. I've done this for back-projection in tight spaces.
          – Chris H
          10 hours ago






        • 3




          To be fair this has been a feature of e.g. nVidia drivers since long before anybody used a desktop OS on/as a tablet.
          – Lightness Races in Orbit
          9 hours ago






        • 1




          @AustinHemmelgarn Yes, it was just an example ("e.g." means "for example"). I was thinking of the old little proprietary control panel you'd get that you could use to flip the screen around aaaages ago, but yes my whole point is that this is not in any way a new technology. The whole tablet thing is very new by comparison.
          – Lightness Races in Orbit
          4 hours ago

















        up vote
        31
        down vote



        accepted










        One common case where you'd want to turn your screen upside down is if you have a laptop doubling as a tablet computer, like this:



        Leonovo Yoga in tablet mode



        Another common case is if you attach a projector to the roof instead of letting it stand on a table.






        share|improve this answer





















        • I would have thought that an inverted screen on a tablet computer is a feature, not something that needs to be fixed as noted in the question. The projector aspect is one I hadn't thought of, yet had to use during an assist at the library! Dying brain cells.
          – fred_dot_u
          13 hours ago










        • The thing with the computer is that you need to be able to turn the screen depending on what mode you're using it in. One way in ordinary laptop mode. Another in this tablet mode. You can see that the text "Lenovo" is upside down because of it.
          – user.S
          13 hours ago






        • 6




          You can also bounce a projector off a mirror, which requires the projector or OS to support displaying a mirror image. I've done this for back-projection in tight spaces.
          – Chris H
          10 hours ago






        • 3




          To be fair this has been a feature of e.g. nVidia drivers since long before anybody used a desktop OS on/as a tablet.
          – Lightness Races in Orbit
          9 hours ago






        • 1




          @AustinHemmelgarn Yes, it was just an example ("e.g." means "for example"). I was thinking of the old little proprietary control panel you'd get that you could use to flip the screen around aaaages ago, but yes my whole point is that this is not in any way a new technology. The whole tablet thing is very new by comparison.
          – Lightness Races in Orbit
          4 hours ago















        up vote
        31
        down vote



        accepted







        up vote
        31
        down vote



        accepted






        One common case where you'd want to turn your screen upside down is if you have a laptop doubling as a tablet computer, like this:



        Leonovo Yoga in tablet mode



        Another common case is if you attach a projector to the roof instead of letting it stand on a table.






        share|improve this answer












        One common case where you'd want to turn your screen upside down is if you have a laptop doubling as a tablet computer, like this:



        Leonovo Yoga in tablet mode



        Another common case is if you attach a projector to the roof instead of letting it stand on a table.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 13 hours ago









        user.S

        47126




        47126












        • I would have thought that an inverted screen on a tablet computer is a feature, not something that needs to be fixed as noted in the question. The projector aspect is one I hadn't thought of, yet had to use during an assist at the library! Dying brain cells.
          – fred_dot_u
          13 hours ago










        • The thing with the computer is that you need to be able to turn the screen depending on what mode you're using it in. One way in ordinary laptop mode. Another in this tablet mode. You can see that the text "Lenovo" is upside down because of it.
          – user.S
          13 hours ago






        • 6




          You can also bounce a projector off a mirror, which requires the projector or OS to support displaying a mirror image. I've done this for back-projection in tight spaces.
          – Chris H
          10 hours ago






        • 3




          To be fair this has been a feature of e.g. nVidia drivers since long before anybody used a desktop OS on/as a tablet.
          – Lightness Races in Orbit
          9 hours ago






        • 1




          @AustinHemmelgarn Yes, it was just an example ("e.g." means "for example"). I was thinking of the old little proprietary control panel you'd get that you could use to flip the screen around aaaages ago, but yes my whole point is that this is not in any way a new technology. The whole tablet thing is very new by comparison.
          – Lightness Races in Orbit
          4 hours ago




















        • I would have thought that an inverted screen on a tablet computer is a feature, not something that needs to be fixed as noted in the question. The projector aspect is one I hadn't thought of, yet had to use during an assist at the library! Dying brain cells.
          – fred_dot_u
          13 hours ago










        • The thing with the computer is that you need to be able to turn the screen depending on what mode you're using it in. One way in ordinary laptop mode. Another in this tablet mode. You can see that the text "Lenovo" is upside down because of it.
          – user.S
          13 hours ago






        • 6




          You can also bounce a projector off a mirror, which requires the projector or OS to support displaying a mirror image. I've done this for back-projection in tight spaces.
          – Chris H
          10 hours ago






        • 3




          To be fair this has been a feature of e.g. nVidia drivers since long before anybody used a desktop OS on/as a tablet.
          – Lightness Races in Orbit
          9 hours ago






        • 1




          @AustinHemmelgarn Yes, it was just an example ("e.g." means "for example"). I was thinking of the old little proprietary control panel you'd get that you could use to flip the screen around aaaages ago, but yes my whole point is that this is not in any way a new technology. The whole tablet thing is very new by comparison.
          – Lightness Races in Orbit
          4 hours ago


















        I would have thought that an inverted screen on a tablet computer is a feature, not something that needs to be fixed as noted in the question. The projector aspect is one I hadn't thought of, yet had to use during an assist at the library! Dying brain cells.
        – fred_dot_u
        13 hours ago




        I would have thought that an inverted screen on a tablet computer is a feature, not something that needs to be fixed as noted in the question. The projector aspect is one I hadn't thought of, yet had to use during an assist at the library! Dying brain cells.
        – fred_dot_u
        13 hours ago












        The thing with the computer is that you need to be able to turn the screen depending on what mode you're using it in. One way in ordinary laptop mode. Another in this tablet mode. You can see that the text "Lenovo" is upside down because of it.
        – user.S
        13 hours ago




        The thing with the computer is that you need to be able to turn the screen depending on what mode you're using it in. One way in ordinary laptop mode. Another in this tablet mode. You can see that the text "Lenovo" is upside down because of it.
        – user.S
        13 hours ago




        6




        6




        You can also bounce a projector off a mirror, which requires the projector or OS to support displaying a mirror image. I've done this for back-projection in tight spaces.
        – Chris H
        10 hours ago




        You can also bounce a projector off a mirror, which requires the projector or OS to support displaying a mirror image. I've done this for back-projection in tight spaces.
        – Chris H
        10 hours ago




        3




        3




        To be fair this has been a feature of e.g. nVidia drivers since long before anybody used a desktop OS on/as a tablet.
        – Lightness Races in Orbit
        9 hours ago




        To be fair this has been a feature of e.g. nVidia drivers since long before anybody used a desktop OS on/as a tablet.
        – Lightness Races in Orbit
        9 hours ago




        1




        1




        @AustinHemmelgarn Yes, it was just an example ("e.g." means "for example"). I was thinking of the old little proprietary control panel you'd get that you could use to flip the screen around aaaages ago, but yes my whole point is that this is not in any way a new technology. The whole tablet thing is very new by comparison.
        – Lightness Races in Orbit
        4 hours ago






        @AustinHemmelgarn Yes, it was just an example ("e.g." means "for example"). I was thinking of the old little proprietary control panel you'd get that you could use to flip the screen around aaaages ago, but yes my whole point is that this is not in any way a new technology. The whole tablet thing is very new by comparison.
        – Lightness Races in Orbit
        4 hours ago














        up vote
        22
        down vote













        One can envision a circumstance in which the display mounting and associated brackets can only permit an inverted attachment of the panel. A kiosk with limited access may be one example, a display unit mounted at ceiling height with a mounting bracket that cannot be attached unless upside down.



        In the case of a laptop, I can picture a situation in which the keyboard is mounted inside a box with the display extending outside the enclosure which would require to invert the image for viewing in a normal orientation.



        I expect there are other circumstances in which this applies.






        share|improve this answer

























          up vote
          22
          down vote













          One can envision a circumstance in which the display mounting and associated brackets can only permit an inverted attachment of the panel. A kiosk with limited access may be one example, a display unit mounted at ceiling height with a mounting bracket that cannot be attached unless upside down.



          In the case of a laptop, I can picture a situation in which the keyboard is mounted inside a box with the display extending outside the enclosure which would require to invert the image for viewing in a normal orientation.



          I expect there are other circumstances in which this applies.






          share|improve this answer























            up vote
            22
            down vote










            up vote
            22
            down vote









            One can envision a circumstance in which the display mounting and associated brackets can only permit an inverted attachment of the panel. A kiosk with limited access may be one example, a display unit mounted at ceiling height with a mounting bracket that cannot be attached unless upside down.



            In the case of a laptop, I can picture a situation in which the keyboard is mounted inside a box with the display extending outside the enclosure which would require to invert the image for viewing in a normal orientation.



            I expect there are other circumstances in which this applies.






            share|improve this answer












            One can envision a circumstance in which the display mounting and associated brackets can only permit an inverted attachment of the panel. A kiosk with limited access may be one example, a display unit mounted at ceiling height with a mounting bracket that cannot be attached unless upside down.



            In the case of a laptop, I can picture a situation in which the keyboard is mounted inside a box with the display extending outside the enclosure which would require to invert the image for viewing in a normal orientation.



            I expect there are other circumstances in which this applies.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 19 hours ago









            fred_dot_u

            645136




            645136






















                up vote
                19
                down vote













                Addressing the sideways rotation part of the question, the main time I've done so is when I've wanted to see many lines of content at once, e.g. a long file of code, a terminal output, or a spreadsheet. Some desktop monitors (e.g. this one) have a stand that rotates by 90°, but the software needs to rotate the video output too, otherwise everything becomes harder to read.






                share|improve this answer



















                • 3




                  +1 for addressing sideways rotation; back before 27" monitors were the norm my favored workspace setup was two 23" monitors, one rotated sideways and off to the side for viewing documentation while the standard orientation was my main screen for doing work.
                  – fluffy
                  10 hours ago






                • 1




                  Wow that's so smart
                  – Lynob
                  9 hours ago






                • 1




                  @Lynob This concept has actually been around for almost half a century. The original Xerox Alto systems (the first computers with a graphical interface) used a screen in a portrait orientation like this because they were designed specifically for document processing. The use of a landscape orientation came about largely for viewing videos, and has largely stuck around because displaying a 16:9 video on a 9:16 screen wastes a huge amount of space.
                  – Austin Hemmelgarn
                  4 hours ago















                up vote
                19
                down vote













                Addressing the sideways rotation part of the question, the main time I've done so is when I've wanted to see many lines of content at once, e.g. a long file of code, a terminal output, or a spreadsheet. Some desktop monitors (e.g. this one) have a stand that rotates by 90°, but the software needs to rotate the video output too, otherwise everything becomes harder to read.






                share|improve this answer



















                • 3




                  +1 for addressing sideways rotation; back before 27" monitors were the norm my favored workspace setup was two 23" monitors, one rotated sideways and off to the side for viewing documentation while the standard orientation was my main screen for doing work.
                  – fluffy
                  10 hours ago






                • 1




                  Wow that's so smart
                  – Lynob
                  9 hours ago






                • 1




                  @Lynob This concept has actually been around for almost half a century. The original Xerox Alto systems (the first computers with a graphical interface) used a screen in a portrait orientation like this because they were designed specifically for document processing. The use of a landscape orientation came about largely for viewing videos, and has largely stuck around because displaying a 16:9 video on a 9:16 screen wastes a huge amount of space.
                  – Austin Hemmelgarn
                  4 hours ago













                up vote
                19
                down vote










                up vote
                19
                down vote









                Addressing the sideways rotation part of the question, the main time I've done so is when I've wanted to see many lines of content at once, e.g. a long file of code, a terminal output, or a spreadsheet. Some desktop monitors (e.g. this one) have a stand that rotates by 90°, but the software needs to rotate the video output too, otherwise everything becomes harder to read.






                share|improve this answer














                Addressing the sideways rotation part of the question, the main time I've done so is when I've wanted to see many lines of content at once, e.g. a long file of code, a terminal output, or a spreadsheet. Some desktop monitors (e.g. this one) have a stand that rotates by 90°, but the software needs to rotate the video output too, otherwise everything becomes harder to read.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 10 hours ago

























                answered 11 hours ago









                Charlie Harding

                52229




                52229








                • 3




                  +1 for addressing sideways rotation; back before 27" monitors were the norm my favored workspace setup was two 23" monitors, one rotated sideways and off to the side for viewing documentation while the standard orientation was my main screen for doing work.
                  – fluffy
                  10 hours ago






                • 1




                  Wow that's so smart
                  – Lynob
                  9 hours ago






                • 1




                  @Lynob This concept has actually been around for almost half a century. The original Xerox Alto systems (the first computers with a graphical interface) used a screen in a portrait orientation like this because they were designed specifically for document processing. The use of a landscape orientation came about largely for viewing videos, and has largely stuck around because displaying a 16:9 video on a 9:16 screen wastes a huge amount of space.
                  – Austin Hemmelgarn
                  4 hours ago














                • 3




                  +1 for addressing sideways rotation; back before 27" monitors were the norm my favored workspace setup was two 23" monitors, one rotated sideways and off to the side for viewing documentation while the standard orientation was my main screen for doing work.
                  – fluffy
                  10 hours ago






                • 1




                  Wow that's so smart
                  – Lynob
                  9 hours ago






                • 1




                  @Lynob This concept has actually been around for almost half a century. The original Xerox Alto systems (the first computers with a graphical interface) used a screen in a portrait orientation like this because they were designed specifically for document processing. The use of a landscape orientation came about largely for viewing videos, and has largely stuck around because displaying a 16:9 video on a 9:16 screen wastes a huge amount of space.
                  – Austin Hemmelgarn
                  4 hours ago








                3




                3




                +1 for addressing sideways rotation; back before 27" monitors were the norm my favored workspace setup was two 23" monitors, one rotated sideways and off to the side for viewing documentation while the standard orientation was my main screen for doing work.
                – fluffy
                10 hours ago




                +1 for addressing sideways rotation; back before 27" monitors were the norm my favored workspace setup was two 23" monitors, one rotated sideways and off to the side for viewing documentation while the standard orientation was my main screen for doing work.
                – fluffy
                10 hours ago




                1




                1




                Wow that's so smart
                – Lynob
                9 hours ago




                Wow that's so smart
                – Lynob
                9 hours ago




                1




                1




                @Lynob This concept has actually been around for almost half a century. The original Xerox Alto systems (the first computers with a graphical interface) used a screen in a portrait orientation like this because they were designed specifically for document processing. The use of a landscape orientation came about largely for viewing videos, and has largely stuck around because displaying a 16:9 video on a 9:16 screen wastes a huge amount of space.
                – Austin Hemmelgarn
                4 hours ago




                @Lynob This concept has actually been around for almost half a century. The original Xerox Alto systems (the first computers with a graphical interface) used a screen in a portrait orientation like this because they were designed specifically for document processing. The use of a landscape orientation came about largely for viewing videos, and has largely stuck around because displaying a 16:9 video on a 9:16 screen wastes a huge amount of space.
                – Austin Hemmelgarn
                4 hours ago










                up vote
                6
                down vote













                Many restaurants show their menus on rotated screen (portrait mode); same for airports Departure and Arrival lists. Newer ones are simple oversize screens with 90 degree rotated display.



                Others have already mentioned reasons for mirroring (projecting via a mirror to fold the distance needed; or back-projecting), and for 180 degree rotations (set-up tablets, etc.)






                share|improve this answer

























                  up vote
                  6
                  down vote













                  Many restaurants show their menus on rotated screen (portrait mode); same for airports Departure and Arrival lists. Newer ones are simple oversize screens with 90 degree rotated display.



                  Others have already mentioned reasons for mirroring (projecting via a mirror to fold the distance needed; or back-projecting), and for 180 degree rotations (set-up tablets, etc.)






                  share|improve this answer























                    up vote
                    6
                    down vote










                    up vote
                    6
                    down vote









                    Many restaurants show their menus on rotated screen (portrait mode); same for airports Departure and Arrival lists. Newer ones are simple oversize screens with 90 degree rotated display.



                    Others have already mentioned reasons for mirroring (projecting via a mirror to fold the distance needed; or back-projecting), and for 180 degree rotations (set-up tablets, etc.)






                    share|improve this answer












                    Many restaurants show their menus on rotated screen (portrait mode); same for airports Departure and Arrival lists. Newer ones are simple oversize screens with 90 degree rotated display.



                    Others have already mentioned reasons for mirroring (projecting via a mirror to fold the distance needed; or back-projecting), and for 180 degree rotations (set-up tablets, etc.)







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 8 hours ago









                    Aganju

                    8,28431334




                    8,28431334






















                        up vote
                        1
                        down vote













                        I know probably not many do this, but for some time that I had my desktop monitor close to where my head's at in bed, I would rotate the screen so I could read or watch a movie while laying on my side. I've also done that with my laptop a few times.






                        share|improve this answer

























                          up vote
                          1
                          down vote













                          I know probably not many do this, but for some time that I had my desktop monitor close to where my head's at in bed, I would rotate the screen so I could read or watch a movie while laying on my side. I've also done that with my laptop a few times.






                          share|improve this answer























                            up vote
                            1
                            down vote










                            up vote
                            1
                            down vote









                            I know probably not many do this, but for some time that I had my desktop monitor close to where my head's at in bed, I would rotate the screen so I could read or watch a movie while laying on my side. I've also done that with my laptop a few times.






                            share|improve this answer












                            I know probably not many do this, but for some time that I had my desktop monitor close to where my head's at in bed, I would rotate the screen so I could read or watch a movie while laying on my side. I've also done that with my laptop a few times.







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered 6 hours ago









                            JoL

                            1735




                            1735






























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