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#1 2021-07-29 20:35:08

HencoReyneke
Member
Registered: 2018-08-06
Posts: 8

2160P Display Issues - Sharp LQ156D1JX01 on RP4

Good evening all

I have a Sharp LQ156D1JX01 panel driven by a RTD2795_p2H_WS_R10.1 control board.

I have the panel functioning correctly on a RP3 B at 24hz but the refresh rate was horrendously slow.

I have since upgraded to a RP4 B 8gb since it comes native with "4k" display but i cannot get the screen to either turn on or display the calibration grid correctly.

I have installed the full version of Raspberry OS and managed to run the panel at 3840 X 2160 @ 60 Hz by setting the following in the config.txt file

hdmi_enable_4kp60=1
hdmi_group = 1
hdmi_mode = 97

However, when I use the same settings for NanoDLP I get no output from the display what soever.

I have aslo tried the instructions as outlined in the thread from https://www.nanodlp.com/forum/viewtopic.php?id=3044 but this does not work at all.

Could anyone possibly assist whom has gotten a 2160P display to work correctly with NanoDLP and a RP4?

Any and all assistance would be appreciated.

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#2 2021-08-01 18:35:25

abcdmku
Member
Registered: 2021-08-01
Posts: 1

Re: 2160P Display Issues - Sharp LQ156D1JX01 on RP4

I was having a similar issue using a 4k LCD from a dell monitor.

I cant post links, but thread #2665 got me 98% of the way there. I just had to swap the pixel width and height:

disable_overscan=0
dtparam=i2c_arm=on
dtparam=audio=on
dtoverlay=vc4-fkms-v3d
max_framebuffers=2

start_x=1
gpu_mem=256


disable_splash=1
boot_delay=0
dtoverlay=pi3-disable-bt
hdmi_ignore_cec_init=1

[pi4]
max_framebuffers=2
framebuffer_priority=2

[all]
hvs_priority=0x32ff
force_turbo=1
gpu_mem=256
enable_uart=1
start_x=0
disable_overscan=1
overscan_top=65
overscan_bottom=10
hdmi_ignore_edid=0xa5000080
hdmi_force_hotplug=1
hdmi_drive=1
hdmi_enable_4kp60=1
hdmi_group=2
hdmi_mode=87
hdmi_pixel_encoding=2
hdmi_pixel_freq_limit=700000000
hdmi_timings=3840 0 106 32 100 2160 0 12 2 10 0 0 0 60 0 277976160 3
framebuffer_width=3840
framebuffer_height=2160
framebuffer_depth=16
framebuffer_ignore_alpha=1
max_framebuffer_width=3840
max_framebuffer_height=2160

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#3 2021-08-04 22:52:22

HencoReyneke
Member
Registered: 2018-08-06
Posts: 8

Re: 2160P Display Issues - Sharp LQ156D1JX01 on RP4

Thank you soon much. Got the display going with your post.

Thank you again.

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#4 2021-11-09 17:54:20

PropellerHat
Member
Registered: 2019-07-23
Posts: 35

Re: 2160P Display Issues - Sharp LQ156D1JX01 on RP4

I have a panel of same resolution but can´t make it show any pic with these settings sad

What does this mean: [pi4] and this: [all]?

Anyway, so far the most promising looking help I´ve found in this jungle big_smile

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#5 2021-11-11 15:43:30

PropellerHat
Member
Registered: 2019-07-23
Posts: 35

Re: 2160P Display Issues - Sharp LQ156D1JX01 on RP4

I have the same controller, RPI4 and a 3840x2160 panel, but all I see is black.

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#6 2021-11-12 07:07:40

Shahin
Administrator
Registered: 2016-02-17
Posts: 3,517

Re: 2160P Display Issues - Sharp LQ156D1JX01 on RP4

Parameters may differ on Pi3 vs Pi4. Also make sure you are using recent firmware, Raspberry Pi firmware update sometimes help.

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#7 2021-12-07 06:55:43

Rahul
Member
Registered: 2019-11-27
Posts: 35

Re: 2160P Display Issues - Sharp LQ156D1JX01 on RP4

Not sure if you were able to resolve your issue with 4k Sharp display. Below are the settings that work well for me.


# Screen 1 @ HDMI0 - 4K LCD @2160x3840
hdmi_pixel_encoding:0=2
hdmi_force_mode:0=1
disable_overscan:0=1

hdmi_cvt:0=2160 3840 24 3 0 0 0
hdmi_group:0=2
hdmi_mode:0=87
hdmi_drive:0=2
hdmi_force_hotplug:0=1
config_hdmi_boost:0=4

framebuffer_width:0=2160
framebuffer_height:0=3840
max_framebuffer_width:0=2160
max_framebuffer_height:0=3840

framebuffer_depth:0=32
framebuffer_ignore_alpha:0=1
hdmi_pixel_freq_limit:0=500000000

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