macmuchmore
Posts: 11
Joined: Fri Mar 29, 2013 2:47 pm

Screen resolution

Mon Apr 10, 2017 3:43 pm

I just got the Raspberry Pi 7" Touchscreen Display (using it with a Raspberry Pi 3 and the latest Raspbian Jessie) and on the box it says the screen resolution is 800x480. In the System tab of the Raspberry Pi Configuration, it lists the resolution at 720x480.

1) Why is it not going to 800x480 automatically?
2) If I attempt to change the resolution in the System tab, in the dropdown it does not list the 800x480 resolution.
3) Can I actually get the Pi to display 800x480, or is 720x480 it? If I can, how do I change the output to 800x480?
4) if the screen is only 720x480, why does the box say 800x480?

Thanks,
Macmuchmore
Raspberry Pi's (Raspbian OS)
  • 1x Raspberry Pi 3
    1x512 MB Raspberry Pi
    1x256 MB Raspberry Pi

soswow
Posts: 1
Joined: Wed May 24, 2017 11:25 am

Re: Touchscreens for Raspberry Pi

Wed May 24, 2017 11:37 am

macmuchmore wrote:I just got the Raspberry Pi 7" Touchscreen Display (using it with a Raspberry Pi 3 and the latest Raspbian Jessie) and on the box it says the screen resolution is 800x480. In the System tab of the Raspberry Pi Configuration, it lists the resolution at 720x480.

1) Why is it not going to 800x480 automatically?
2) If I attempt to change the resolution in the System tab, in the dropdown it does not list the 800x480 resolution.
3) Can I actually get the Pi to display 800x480, or is 720x480 it? If I can, how do I change the output to 800x480?
4) if the screen is only 720x480, why does the box say 800x480?

Thanks,
Macmuchmore
What is your screen quality? Mine has random colored pixel all over the place. I believe it's because it tries to stretch 720x480 data feed on 800x480 screen.
Have you managed to solve this problem?

texy
Forum Moderator
Forum Moderator
Posts: 5173
Joined: Sat Mar 03, 2012 10:59 am
Location: Berkshire, England

Re: Touchscreens for Raspberry Pi

Fri May 26, 2017 7:48 am

These 2 posts were originally part of a much larger thread in the 'other projects' forum. As this is specifically related to the official display, I have separated them out and put them here.
Texy
Various male/female 40- and 26-way GPIO header for sale here ( IDEAL FOR YOUR PiZero ):
https://www.raspberrypi.org/forums/viewtopic.php?f=93&t=147682#p971555

ktb
Posts: 1447
Joined: Fri Dec 26, 2014 7:53 pm

Re: Screen resolution

Fri May 26, 2017 8:52 am

I believe what you're seeing is due to the limited functionality of rc_gui and raspi-config. I don't think this feature is meant to really work for anything other than HDMI displays. 720x480 is just the default in raspi-config and rc_gui and it doesn't mean that is what is being used with the DSI connected touchscreen.

What does the command tvservice -s return?

Code: Select all

pi@raspberrypi:~ $ tvservice -s
state 0x400000 [LCD], 800x480 @ 60.00Hz, progressive
https://github.com/raspberrypi-ui/rc_gu ... c/rc_gui.c
https://github.com/RPi-Distro/raspi-con ... spi-config

User avatar
elkberry
Posts: 167
Joined: Wed Dec 28, 2016 9:21 pm

Re: Screen resolution

Fri May 26, 2017 12:10 pm

Or use xdpyinfo; this also should show X11 running in 800x480 resolution.

Random colored pixels rather look like a hardware issue to me. At home and at work I have several RPi3's equipped with 7" Touch LCDs, and never seen any randomly colored pixels. Might be cabling, might be some crazy interference, might be a damaged VGPU, or a damaged converter board, or even damaged LCD controller.
From ZX81 to Raspberry Pi, but wait ... where's the 7805 gone?

RodMyers
Posts: 8
Joined: Tue Jun 13, 2017 11:32 pm

Re: Screen resolution

Wed Jun 14, 2017 12:11 am

Even though the specs say 800x600, the max resolution is 740x480?

User avatar
elkberry
Posts: 167
Joined: Wed Dec 28, 2016 9:21 pm

Re: Screen resolution

Wed Jun 14, 2017 6:14 pm

No, this is misinformation. The 7" Touch LCD has 800x480 true resolution. I know from my screen recordings, both from display memory by letting the VCPU copying the LCD display onto the HDMI output, and from taking shots using a FullHD video cam, then checking both shots closely. Yes, the LCD is 800x480.
From ZX81 to Raspberry Pi, but wait ... where's the 7805 gone?

RodMyers
Posts: 8
Joined: Tue Jun 13, 2017 11:32 pm

Re: Screen resolution

Wed Jun 14, 2017 10:46 pm

thank you.

i managed to web search a solution to gain a 900x600-ish display size

User avatar
buja
Posts: 626
Joined: Wed Dec 31, 2014 8:21 am
Location: Netherlands

Re: Screen resolution

Thu Jun 15, 2017 8:02 am

RodMyers wrote:thank you.

i managed to web search a solution to gain a 900x600-ish display size
Try this link: viewtopic.php?f=108&t=184762

grabbies200
Posts: 1
Joined: Thu Sep 20, 2012 4:21 am

Re: Screen resolution

Mon Feb 26, 2018 4:30 am

I had the same problem with the pixels having weird colors, especially when using the terminal in PIXEL. It is a software problem and not a hardware one as suggested above. The problem started after an apt-get install dist-upgrade for me. I re flashed my sd card to original image and problem was solved. In terms of the resolution, ignore what the resolution reports as it does not affect the monitor.

User avatar
ab1jx
Posts: 902
Joined: Thu Sep 26, 2013 1:54 pm
Location: Heath, MA USA

Re: Screen resolution

Fri Mar 02, 2018 2:57 am

The calibration being off could do that I think. Although I'm not sure about X reading back the wrong values. I just did a couple calibration posts from fixing mine. There's kernel level calibration and then calibration in X, if you start with kernel level and then do X you should find it.

Return to “Official Display”