SHARP LQ5AW136 TFT Display

I got a Sharp LQ5AW136 TFT display from an old car CD, TO interface it with ESP32 using the Fabgl library to drive the display.

Volkswagen VW Radio Navigation System MFD, Golf, 3b0035191d

this display uses different voltages. +5V -5V , 2.16 , 8 and 12V for the backlight inverter .

I cut the original display connector from the Car CD, and I did use it in the PCB board to interface with the display, I have to use load termination to lower the signal amplitude because the SHARP display requires it 0.7V for red green, and blue. I cut the VGA board from an old TV motherboard, I did use it as load termination.

1.ESP32

2. SHARP LQ5AW136 TFT DISPLAY

3. DC TO DC Buck converter 3

4. Dual voltage buck converter 1

5. Breakout board for the display connections

6. Load termination breakout board

7. old laptop power supply 19 V

8. Two potentiometers, one for backlight, the second for color intensity

9. backlight driver circuit

SHARP AVTFT displays are generally meant to be

driven with either a NTSC Composite Video or with discrete

RGB Video signals. SHARP’s AVTFTs have video

compatible inputs that enable easy interfacing to a camcorder,

a VCR, or the video output from a CCD camera.

Most AVTFTs have two video input channels. One channel

may be an NTSC Composite input and the other will

be discrete RGB Video input. An example of this video

input configuration is the LQ056A3CH01.

The LQ5AW116 is a dual video input channel

AVTFT with discrete RGB inputs. It has a composite

video input, but the display electronics merely use this

input to strip off the sync information, disregarding the

video content of the composite signal.

The LQ5AW116 was designed for discrete RGB

video sources. It does not have an onboard video

decoder. It requires an external video decoder IC like the

SHARP IR3Y18A to make it compatible with NTSC

video. However, if the user does not have a video source

and wants to drive the LQ5AW116 with a flap panel

video controller like a C&T, this paper will demonstrate a

method of interfacing to the C&T 65545 video controller

to drive either of the panel’s RGB input channels.

LQ5AW136 OPERATION

The LQ5AW116 is an AVTFT (Audio Visual Thin

Film Transistor) LCD. It can display one of two video

input channels by making pin 7, VSW = HIGH

(channel 1) or VSW = LOW (channel 2). The display

can generate an LCD pixel clock internally or it can use

an external clock depending on the setting of CLCK

input. If the video signal input is NTSC decoded RGB,

then CLCK = HIGH and an internal PLL will generate a

pixel clock that is phase locked to the sync input. By

doing this, pin 22 (CLK), pin 1 (HSYNC) and pin 2

(VSYNC) become outputs. If an RGB video signal is

available and the user would like to control the LCD

timing, set CLCK = LOW, making CLK, HSYNC, and

VSYNC inputs.

Pin 8 (SAM) determines the external clock sampling

mode. In Independent Data Sampling mode

(pin 8 = HIGH), external clock (18.2 MHz to 19.6 MHz)

is three times faster than in Simultaneous mode

(pin 8 = LOW) and video data is sampled sequentially

(first red, then green, and then blue). In Simultaneous

mode, all three video inputs are sampled at the same

point in time with a slower clock (6.8 MHz to 7.6 MHz).

https://www.youtube.com/watch?v=U8ZyUq8Dtkw