LIQUID CRYSTAL DISPLAY MODULE AND DISPLAY SYSTEM INCLUDING THE SAME

• US 20100103090A1
• Filed: 10/23/2009
• Published: 04/29/2010
• Est. Priority Date: 10/23/2008
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: BAEK, Jong-Hak
• Application Number:
  US12/604,535
• Publication Number:
  US 20100103090A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A liquid crystal display (LCD) module includes a flexible backlight unit panel. The LCD module includes an LCD panel and the flexible back light unit panel. The flexible back light unit located behind of the LCD panel includes a plurality of planar light sources that are arranged in a matrix form to provide backlight to the LCD panel. The LCD module does not require diffusion sheet for distributing light sources, has a simple structure and is implemented as a small size, and may effectively perform a local dimming operation.

Claims

1. A liquid crystal display (LCD) module, comprising:

an LCD panel; and

a flexible back light unit panel located adjacent to the LCD panel, the flexible back light unit panel including a plurality of planar light sources arranged in a matrix form to provide backlight to the LCD panel.

2. The LCD module of claim 1, further comprising:

a control circuit to receive image data, and to generate first image data, a first control signal, second image data, and a second control signal based on the received image data.

3. The LCD module of claim 2, further comprising:

a back light unit driving circuit to receive the first image data and first control signal and to generate first gate control signals and first source signals to drive the flexible back light unit panel; and

an LCD driving circuit to receive the second image data and second control signal and to generate second gate control signals and second source signals to drive the LCD panel.

4. The LCD module of claim 3, wherein the back light unit driving circuit and the flexible back light unit panel are embodied as one unit, and the LCD driving circuit and the LCD panel are embodied as one unit, respectively.

5. The LCD module of claim 2, wherein the control circuit comprises:

an interface circuit to receive the image data, to generate a control signal based on the image data, and to buffer the image data;

a storage unit to store the buffered image data, and to output the first control signal and the second control signal based on the control signal from the interface circuit; and

a signal processing unit to receive the buffered image data, the first control signal, and the second control signal, and to generate the first image data, the first control signal, the second image data, and the second control signal based on the buffered image data, the first control signal and the second control signal.

6. The LCD module of claim 5, wherein the storage unit comprises:

a control register to store the control signal, and to output the first control signal and the second control signal based on the control signal; and

a frame buffer to store the buffered image data.

7. The LCD module of claim 5, wherein the signal processing unit comprises:

a back light unit image processor to receive the first control signal and the buffered image data, to perform signal processing on the buffered image data to generate the first image data and to output the first control signal; and

a display image processor to receive the second control signal and the buffered image data, to perform signal processing on the buffered image data to generate the second image data, and to output the second control signal.

8. The LCD module of claim 7, wherein the back light unit image processor comprises:

an image feature extraction unit to extract image features based on the buffered image data;

an image classification unit to classify the image data based on the extracted image features; and

a calculation unit to calculate a contrast value and a power supply control value based on the classified image data to generate the first image data.

9. The LCD module of claim 2, further comprising:

a power supply unit to provide a power supply voltage to the LCD panel and the flexible back light unit panel, and to adjust a magnitude of the power supply voltage based on a power control signal from the control circuit.

10. A display system, comprising:

a host to provide image data; and

an LCD module to receive the image data from the host, to generate first image data, a first control signal, second image data, and a second control signal based on the received image data, to drive a flexible back light unit panel based on the first image data and the first control signal, and to drive an LCD panel based on the second image data and the second control signal.

11. An LCD module, comprising:

an LCD layer; and

a backlight layer adjacent to the LCD layer, the backlight layer comprising a plurality of planar light elements, each planar light element including a substantially planar light-emitting surface to emit light toward the LCD layer,

wherein the substantially planar light-emitting surfaces of the plurality of planar light elements are located along substantially the same flat plane when the backlight layer is in an un-bent state.

12. The LCD module according to claim 11, wherein the LCD layer comprises a plurality of liquid cells arranged in a grid, and

the plurality of planar light elements of the backlight layer are arranged in a grid to correspond to the grid of the LCD layer.

13. The LCD module according to claim 11, wherein the plurality of planar light elements are formed on a flexible plastic substrate.

14. The LCD module according to claim 11, wherein each of the plurality of planar light elements comprises:

at least one first transistor;

at least one capacitor having a first end connected to a drain of the first transistor;

at least a second transistor having a gate connected to the drain of the first transistor and a source connected to a second end of the capacitor; and

at least one diode connected to the drain of the second transistor.

15. The LCD module according to claim 14, wherein the backlight layer further comprises:

a plurality of column electrodes, each column electrode of the plurality of column electrodes connected to a source of the first electrode of a plurality of planar backlight elements arranged in a column; and

a plurality of row electrodes orthogonal to the plurality of column electrodes, each row electrode of the plurality of row electrodes connected to a gate of the first transistor of a plurality of planar backlight elements arranged in a row.

16. The LCD module according to claim 15, further comprising:

a backlight layer driving circuit to transmit control signals to the plurality of column electrodes and the plurality of row electrodes, respectively.

17. The LCD module according to claim 16, wherein the backlight layer driving circuit is located on the backlight layer.

18. The LCD module according to claim 16, further comprising:

an LCD driving circuit to drive the LCD layer; and

a controller to receive an image signal and to output a first image data signal and a first control signal to the backlight unit driver circuit and to output a second image data signal and a second control signal to the LCD driving circuit.

19. The LCD module according to claim 18, wherein the controller comprises:

an interface circuit to receive the image signal and to output an interface circuit control signal and the image signal;

a control register to receive the interface circuit control signal and to output a first control signal to control operation of the backlight layer and a second control signal to control operation of the LCD layer;

a frame memory to buffer the image signal;

a backlight layer image processor to receive the first control signal and the buffered image signal, to process the buffered image signal, and to output first image data and the first control signal to control the backlight layer; and

a display image processor to receive the second control signal and the buffered image signal, to process the buffered image signal, and to output second image data and the second control signal to control the LCD layer.

20. The LCD module according to claim 19, wherein the backlight layer processor comprises:

an image feature extraction unit to receive the buffered image signal, to extract at least one feature from the image signal, and to output an extracted image feature signal;

an image classification unit to receive the extracted image feature signal, to classify the image according to the extracted image feature signal, and to output a classification signal; and

a calculation unit to calculate characteristics of the classification signal and to output the second image data.

21. A display system, comprising:

a host to output an image signal; and

an LCD module to receive and display the image signal, the LCD module comprising;

an LCD layer;

a backlight layer adjacent to the LCD layer, the backlight layer comprising a plurality of planar light elements to diffusely emit light toward the LCD layer; and

a controller to control operation of the LCD layer and the backlight layer,

wherein the controller receives the image signal and controls operation of the LCD layer and the backlight layer according to the received image signal.