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January 30, 2015   Posted by: Dr. Ace Jeangle

How to use HDMI-dualLVDS converter

Our dualLVDS converter has two LVDS channels and supports 24-bits color panels with up to WUXGA (1920×1200 px) resolution. It also has on-board configurable backlight voltage generator and microcontroller with USB interface. We offer this converter as a standalone product, and also in bundle with 10″ WUXGA panel.

DualLVDS converter board has the following connectors:
HDMI-dualLVDS converter

Powering board

Converter board alone takes up to 0.4A current in active mode, with connected 10″ FullHD+ current goes up to 1.2A when backlight is set to maximum value. Board and LCD can be powered either by external power supply (5V at least 2A, jack is OD=2.6mm, ID=0.65mm, positive central pin) or by USB. By default it can be powered by external supply only. For USB power you should install 0R resistor in R12 position. CAUTION! Do not connect external power supply when R12 is installed, it can damage your USB port.

Backlight voltage generator

Converter has on-board configurable backlight voltage generator that can deliver up to 35V/1A. Backlight voltage can be set with R3, R11 resistors (see above picture for formula). We supply boards with default 24V backlight voltage. Take note that R11 should be in 5K – 20K range. If LCD backlight takes more than 3W, then U6 and L1 inductor can have temperature up to 100C degree. In this case you should use additional heat sink to avoid overheating.

LVDS cable

If you buy standalone board, then you will need to make your own LVDS cable for your LCD panel. We supply mate housing connector and 50 pcs of pin terminals together with board, they can be crimped to cable wires with AWG #32 crimp tool. We recommend using PA-09 crimp pliers, it has affordable price and provides high quality results. Below is pinout of LVDS connector, PDF version is available here: dualLVDS board pinout.
dualLVDS Pinout
Pins GPIO_xxx are connected directly to PIC microcontroller and can be used to control different functions of LCD. We ship board with our standard example program (see source code below) that uses pin GPIO_RA5 to turn on LCD backlight when input video signal is detected. If video signal is lost, LCD backlight will be turned off. Also, pin GPIO_RC5 is connected to PIC PWM generator, and can be used to control brightness of LCD backlight.

Update of EDID information

We supply our converter board with pre-loaded EDID data for our 10″ FullHD+ LCD (resolution 1920×1200 px). You will need to update EDID information in converter in order to use it with your own LCD. EDID update procedure is described here: How to program custom EDID data in HDMI converter

Firmware update with USB bootloader

Board is supplied with embedded USB bootloader for easy firmware upload. To update firmware you should start board in bootloader mode by shorting both pins on ambient light sensor connector with jumper, then turn on power. Green LED will light on, and you will have 3 seconds to remove jumper in order to start bootloader. Green LED will blink when bootloader is active. You should follow steps 4 and 5 of this firmware upload procedure: Firmware upload HID USB bootloader is available here: HID USB bootloader. You can use firmware for our FullHD+ LCD bundle for your own LCD projects, latest version of firmware is available here: dualLVDS/FullHD+ firmware

Building PIC firmware

To build own PIC firmware you will need MPLAB.X environment from Microchip with XC8 compiler: MPLAB X, XC8 compiler.
Bootloader occupies the program memory region 0x000-0x903. The application firmware is supposed to occupy the 0x904-[end of flash] region of program memory.
Here are two linker setting changes that are required for the application project:

  1. Under the build configuration–>XC8 global options–>XC8 linker–>Option categories:Additional options the “Codeoffset” must be set to: 0x904
  2. Under the build configuration–>XC8 global options–>XC8 linker–>Option categories:Memory model, the “ROM ranges” must be set to: default,-0-903

In addition to the above, make certain that all configuration bit settings between the bootloader firmware project, and the application firmware project, match 100% exactly, see our example firmware for details:

#include "typedefs.h"


#define _XTAL_FREQ 48000000                     // Frequency of crystal (INTOSC in our case)

void main(void) {
    OSCCON = 0xFC;                              // 3x PLL enabled from 16MHz HFINTOSC
    ACTCON = 0x90;                              // Enable active clock tuning from USB
    while(OSCSTATbits.PLLRDY == 0);             // Wait for PLL ready/locked

    ANSELAbits.ANSA4=0; TRISAbits.TRISA4=1;     // Define SCDT In pin (input)
    LATAbits.LATA5=0; TRISAbits.TRISA5=0;       // Define SCDT Out pin (output, default to 0)
    LATCbits.LATC5=0; TRISCbits.TRISC5=0;       // Define PWM pin (output, default to 0)
    LATCbits.LATC3=1; TRISCbits.TRISC3=0;       // Define LED pin (output, default to 1 - LED Off)

    while(1) {
        // If video signal is detected
        if (PORTAbits.RA4) {                    
            LATAbits.LATA5=1;                   // Enable video outputs
            LATCbits.LATC5=1;                   // Enable backlight (PWM=1 - max. brightness)
            LATCbits.LATC3=0;                   // Turn LED On
        // If video signal is lost
        else {
            LATAbits.LATA5=0;                   // Disable video outputs
            LATCbits.LATC5=0;                   // Disable backlight (PWM=0 - turn off backlight)
            LATCbits.LATC3=1;                   // Turn LED Off

Ambient light sensor and backlight brightness

Ambient light sensor is available as an option, and can measure ambient light level for automatic backlight control.
ambient light sensor
Ambient light sensor should be connected to connector J1, red color wire to pin 1 on connector. Light level is available as a voltage in range 0 (dark) to 2.5V (max. light) on pin RC2 (ADC channel 6) of PIC microcontroller. Backlight brightness can be controlled with help of PWM signal on GPIO_RC5. Additional information about backlight control through USB HID commands is available in this how-to: How to control LCD backlight (USB HID)

Board schematic

Board schematic is available here: http://goo.gl/NSWTIQ

See in action

Video with dualLVDS converter board and our FullHD+ LCD is available here: FullHD+ LCD with HDMI dualLVDS converter

Follow us on Twitter to get instant notification about new firmware release:

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December 16, 2014   Posted by: Dr. Ace Jeangle

Unpleasant surprise from Molex and Mouser

We just finished shipping out all pre-sale orders for our new integrated 10″ LCD, and finally I have time to tell you whole story.

As you know, we expected to ship out all pre-orders end of October – beginning of November. First delay came from Malaysian customs department. They like to withhold shipments with new LCD p/n that is not in their database, and change HS code to the wrong one. DHL customs agent can’t help in situations like this, and we travel to airport, talk to customs officer, prove him that panels are to be used in computing applications, not in TV because of touch screen, no audio input, etc. They consider, then refuse, and we repeat this procedure several time until we meet up with the customs director to tell the story. Then they change to correct HS Code and release shipment.

Well, finally panels were received and we started with assembling process. PCB have been assembled already and successfully tested on our test prototype by production guys. So, we expected simple and fast procedure of assembling boards with LCD, final test and shipping out. How wrong we were! 2/3 of boards were returned from assembly back to production with “QC no pass” sign. Well, production tested these boards again and found out that video processor is dead for unknown reason. They repaired boards and send them back to assembly. And they again failed during assembly process! We got emergency case, and I cancelled my conference trip to get back to office and check situation myself. Indeed, problem magically arise in assembly room – assembled and tested boards simply die during assembly. We checked everything: LCD panels, every component on our board, connectivity, reflow profile, solder paste, ESD equipment used during assembly. Everything was OK, but board still randomly died during assembly process.

Source of problem has been found also accidentally. We received new stereo microscope for production, and after thorough inspection of own nails and killed fly, our technician put Molex FPC cable under microscope just for fun – and source of problem has been found! Half of FPC cables that we used to connect LCD to our board had shifted contacts! Cable has very fine pitch – just 0.3 mm, and shift was about 0.1 mm – its impossible to notice using standard magnifier that we used for manual inspection and we didn’t think we have to check Molex brand cable received from Mouser under microscope!

Defective Molex FPC

Due to this shift, we got accidental shorts between neighbor contacts by FPC connector contacts. As a result, video chip simply die. Around 60% of cables were affected. By chance, production used good cable for tests, and assembly used the rest of cables from purchased batch. That’s why boards worked during post-production tests, but accidentally failed during assembly final test.

Normal FPC

Finally, we sorted out our problem, and now assemble next batch of panels to open stock. Good lesson has been learned – always perform QC to ALL components – even if they are from brand companies like Molex and came from “trusted” sources like Mouser!

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December 12, 2014   Posted by: Dr. Ace Jeangle

How to use our new 10-inch integrated LCD


For first startup you will need:

  1. 10″ integrated LCD panel
  2. miniHDMI cable (available as an option)
  3. 5V/2A power supply, jack is OD=2.6mm, ID=0.65mm, positive (+) central pin (available as an option)
  4. miniUSB cable for touchscreen (available as an option)

LCD control board is fixed on the back side of LCD and connected to LCD panel by FPC cable:
New 10" integrated LCD control board
Powering LCD

LCD with control electronics takes around 1.2A current when backlight is set to maximum value, and it can be powered either by external power supply (5V/2A, jack is OD=2.6mm, ID=0.65mm, positive central pin) or by USB. Power mode is selected by installing one of 0R resistor – R6 for normal power supply or R7 for USB power. CAUTION! Do not install both resistors at once, because this can damage USB port on your computer.

By default we supply LCD with R6 installed, therefore you will need external power supply to run LCD. For USB power you should change 0R resistor from R6 position to R7 position, and make sure that your USB port can continuously provide at least 1.2A current. Power consumption can be significantly decreased by lowering backlight level.

Firmware upgrade

We constantly add new features and provide bug fixes by releasing new firmware for our LCD panels. To update firmware you should start LCD in bootloader mode by shorting pins 5 and 7 on extension header before switching on power, then follow this firmware upload procedure: https://www.chalk-elec.com/?p=1826

New firmware for this 10″ panel is available here: http://goo.gl/wg8WY5
Follow us on Twitter to get instant notification about new firmware release:

Capacitive touchscreen

LCD touchscreen is based on capacitive technology with up to 10 fingers support, and can work in two modes depending on programmed firmware: single-touch mode and multi-touch mode. We supply LCD with default single-touch mode, because it can work without drivers with any USB host. For multi-touch mode you will need to follow firmware upgrade procedure described above and update Linux/Android kernel as per this How-to: https://www.chalk-elec.com/?p=2028

Ambient light sensor and backlight control

Starting from version 2.0 firmware for our 10″ integrated LCD supports LCD backlight control through standard USB HID protocol and automatic backlight control with optional ambient light sensor. Ambient light sensor should be connected to connector J1, red color wire to pin 1 on connector (pin 1 is marked with white dot). Additional details about backlight control from your host board or PC through USB HID commands are available here: How to control LCD backlight (USB HID).

  • Maximum brightness (MAX_BL parameter) is 18 for this 10″ LCD
  • Report ID for backlight control is 0x01

Capacitive button

To be added.

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October 19, 2014   Posted by: Dr. Ace Jeangle

How to get multi-touch working (Linux and Android)

All of our panels come with USB HID multi-touch controllers and are supported by standard “hid-multitouch” driver available in mainline Linux/Android kernel.

If your system already has this “hid-multitouch” driver available as a kernel module, then you can easy add multi-touch support by adding the following commands to your /etc/rc.local file (before “exit” statement):

modprobe hid-multitouch
echo W X Y Z > /sys/module/hid_multitouch/drivers/hid\:hid-multitouch/new_id


  • W – is USB bus number of touchscreen USB, can be figured out by “lsusb” command
  • X and Y – are VID and PID of touchscreen USB, also can be figured out by “lsusb” command
  • Z – is 1 for 7″ and 10″ panels, and 259 for 14″ and 15.6″ panels

If your system has no “hid-multitouch” driver compiled, then the following steps are required to get multi-touch working:

  1. Download kernel sources for your board.
  2. Modify hid-multitouch.c file, located in kernel/drivers/hid/ folder.
  3. Re-build the kernel with the HID-MULTITOUCH option enabled.
  4. Create an IDC (Input Device Configuration) file (required by Android only).

Let’s consider these steps in more details.

  1. Modify hid-multitouch.c file
    First of all, you should download kernel sources and default kernel configuration file for your board. Then, you should go to kernel/drivers/hid older and find there file hid-multitouch.c. This files contain VID:PID values of USB touchscreens that will be processed by hid-multitouch driver. And we should add VID:PID of our touchscreens there. They are:

    • 04D8:F724 for 7″ and new 10″ touchscreens
    • 0EEF:A107 for 14″ touchscreen

    Open file hid-multitouch.c, find mt_devices[] struct and insert the following code at the beginning of this structure define:

    static const struct hid_device_id mt_devices[] = {
        /* Chalkboard Electronics 7" and 10" */
        { .driver_data = MT_CLS_DEFAULT, HID_USB_DEVICE(0x04D8,0xF724) },

        /* Chalkboard Electronics 14" */
        { .driver_data = MT_CLS_DEFAULT, HID_USB_DEVICE(0x0EEF,0xA107) },

        // here the rest of definitions comes

  2. Re-build the kernel with the HID-MULTITOUCH option
    Type “make menuconfig” to configure the kernel, then go to Device Drivers -> HID Devices -> Special HID drivers -> HID Multitouch panels and select it as an embedded driver (*). Save the kernel configuration and compile it to make a zImage kernel file. Transfer the zImage file to your board.
  3. Create an IDC file
    This final step is required for Android only in order to match the resolution of the touch panel to HDMI. Create a plain text file as below:

    touch.deviceType = touchScreen
    touch.orientationAware = 1
    device.internal = 1
    keyboard.layout = qwerty
    keyboard.characterMap = qwerty2
    keyboard.orientationAware = 1
    keyboard.builtIn = 1
    cursor.mode = navigation
    cursor.orientationAware = 1

    The file name must be Vendor_xxxx_Product_yyyy.idc, where xxxx is VID of panel, and yyyy is PID of panel. The filename is case sensitive!In our case, you should use filename Vendor_04d8_Product_f724.idc (7″ and 10″ panels) or Vendor_0eef_Product_a107.idc (14″ panel). Now copy the IDC file to your Android board (Android must be rooted) with the following commands (substitute Vendor_xxxx_Product_yyyy.idc with real file name):

    adb shell
    mount -o rw,remount /system
    adb push Vendor_xxxx_Product_yyyy.idc /system/usr/idc/.
    adb reboot

That’s all. Now you should get multi-touch support working.

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