Liquid crystal display device and display system with the same

Patent metadata

Field	Value
Publication number	US-9837006-B2
Application number	US-201514981409-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 31, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A liquid crystal display device is disclosed which includes a diagnosis controller configured to receive abnormity detection signals representing whether components of the liquid crystal display device are functioning normal. The components of the liquid crystal display device may include an LVDS interface, a timing controller, a data driver circuit, a backlight driver, a supply voltage generator. Such a liquid crystal display device handles treatable abnormities without any external help. In accordance therewith, complexity caused by transferring a large number of signals can be simplified.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
an LVDS (low voltage differential signal) interface configured to input external signals;
a timing controller configured to derive timing control signals from the signals applied from the LVDS interface;
at least one data driver circuit configured to apply data voltages to a liquid crystal display panel in response to the timing control signals;
a backlight driver configured to generate a backlight driving voltage to drive a backlight unit;
a supply voltage generator configured to generate supply voltages used to drive the LVDS interface, the timing controller and the data driver circuit; and
a diagnosis controller configured to input abnormity detection signals representing whether the LVDS interface, the timing controller, the data driver circuit, the backlight driver and the supply voltage generator are abnormal and generate a diagnosed resultant,
wherein the input abnormity detection signals input to the diagnosis controller includes an abnormity detection signal representing whether or not an error is generated in the LVDS interface, an abnormity detection signal representing whether or not an error is generated in the backlight driver, an abnormity detection signal representing whether or not an external main supply voltage is normally applied to the supply voltage generator, and an abnormity detection signal representing whether or not a driving voltage transferred from the supply voltage generator to the backlight driver is normal.

2. The liquid crystal display device of claim 1 , further comprising a crack detection line along an edge of the liquid crystal display panel, wherein the input abnormity detection signals input to the diagnosis controller further includes an abnormity detection signal representing whether the crack detection line is disconnected.

3. The liquid crystal display device of claim 1 , wherein
the data driver circuit is on the liquid crystal display panel, and
the abnormity detection signals input to the diagnosis controller further includes an abnormity detection signal reflecting a voltage attenuation caused by a bonding resistance between the data driver circuit and the liquid crystal display panel.

4. The liquid crystal display device of claim 1 , wherein the abnormity detection signals input to the diagnosis controller further includes an abnormity detection signal which is based on a level variation of a lock signal being applied from the timing controller and passing through the data driver circuit and represents whether or not the data driver circuit is normal.

5. The liquid crystal display device of claim 1 , further comprising a logic gate configured to logic-operate at least some of the input abnormity detection signals which output from each of the LVDS interface, the data driver circuit and the backlight driver and apply a logic-operated composite abnormity detection signal to the diagnosis controller.

6. The liquid crystal display device of claim 5 , wherein the logic gate includes an AND gate.

7. The liquid crystal display device of claim 1 , wherein the diagnosis controller externally transfers the diagnosed resultant using one of a PWM (pulse width modulation) method and an I2C communication method.

8. A display system, comprising:
a plurality of liquid crystal display devices disposed in a vehicle and configured to each generate a diagnosed resultant; and
a system controller configured to perform measures opposite to the diagnosed resultants which are transferred from the liquid crystal display devices,
wherein each of the liquid crystal display devices includes:
an LVDS (low voltage differential signal) interface configured to input external signals;
a timing controller configured to derive timing control signals from the signals applied from the LVDS interface;
at least one data driver circuit configured to apply data voltages to a liquid crystal display panel in response to the timing control signals;
a backlight driver configured to generate a backlight driving voltage used to drive a backlight unit;
a supply voltage generator configured to generate supply voltages used to drive the LVDS interface, the timing controller and the data driver circuit; and
a diagnosis controller configured to input abnormity detection signals representing whether the LVDS interface, the timing controller, the data driver circuit, the backlight driver and the supply voltage generator are abnormal, to generate a diagnosed resultant, and to transfer the diagnosed resultant to the system controller, and
wherein the input abnormity detection signals input to the diagnosis controller includes an abnormity detection signal representing whether or not an error is generated in the LVDS interface, an abnormity detection signal representing whether or not an error is generated in the backlight driver, an abnormity detection signal representing whether or not an external main supply voltage is normally applied to the supply voltage generator, and an abnormity detection signal representing whether or not a driving voltage transferred from the supply voltage generator to the backlight driver is normal.

9. The display system of claim 8 , wherein the diagnosed resultants are transferred to the system controller using one of a PWM (pulse width modulation) method and an I2C communication method.

10. The display system of claim 8 , wherein
each of the liquid crystal display devices further includes a crack detection line disposed along an edge of the liquid crystal display panel, and
the input abnormity detection signals input to the diagnosis controller further includes an abnormity detection signal representing whether the crack detection line is disconnected.

11. The display system device of claim 8 , wherein
the data driver circuit is disposed on the liquid crystal display panel, and
the abnormity detection signals input to the diagnosis controller further includes an abnormity detection signal reflecting a voltage attenuation which is caused by a bonding resistance between the data driver circuit and the liquid crystal display panel.

12. The display system of claim 8 , wherein the abnormity detection signals input to the diagnosis controller further includes an abnormity detection signal which is based on a level variation of a lock signal being applied from the timing controller and passing through the data driver circuit and represents whether or not the data driver circuit is normal.

13. The display system of claim 8 , wherein each of the liquid crystal display devices further includes a logic gate configured to logic-operate at least some of the input abnormity detection signals which output from each of the LVDS interface, the data driver circuit and the backlight driver and apply a logic-operated composite abnormity detection signal to the diagnosis controller.

14. The display system of claim 13 , wherein the logic gate includes an AND gate.

Assignees

• Lg Display Co Ltd

Inventors

• Hwang In Sung
• Kim Jong Dae

Classifications

• G09G3/36 Primary

  using liquid crystals · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2330/12

  Test circuits or failure detection circuits included in a display system, as permanent part thereof · CPC title

• G09G3/3611 Primary

  Control of matrices with row and column drivers · CPC title

• G09G3/3607

  for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127) · CPC title