METHOD FOR IMPROVING A DISPLAY IMAGE PERFORMANCE OF A TRANSFLECTIVE LCD

• US 20060109233A1
• Filed: 03/21/2005
• Published: 05/25/2006
• Est. Priority Date: 11/23/2004
• Status: Abandoned Application

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: Lee, Hsin-Ta, Chen, Yen-Hua
• Application Number:
  US10/907,123
• Publication Number:
  US 20060109233A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2300/0456 with a reflective area and a transmissive area combined in one pixel, such as in transflectance pixels
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A method for improving the display image performance of a transflective LCD containing a back light is disclosed. The method includes setting the LCD driving voltages in a first range when the back light unit is on, and setting the LCD driving voltages in a second range when the back light unit is off, where the second range is different from the first range.

Claims

1. A method for improving the display image performance of a transflective liquid crystal display (LCD), wherein the images produced by the transflective liquid crystal display are supported by a plurality of driving voltages, and the transflective liquid crystal display further comprises a backlight source, the method comprising:

setting the driving voltages in a first driving voltage range when the backlight source is on; and

setting the driving voltages in a second driving voltage range when the backlight source is off, wherein the second driving voltage range is different from the first driving voltage range.

2. The method of claim 1, wherein the transflective liquid crystal display further comprises a plurality of LCD driving integrated circuits (ICs) for providing the driving voltages to the transflective liquid crystal display, and the method further comprises controlling the LCD driving ICs for setting the driving voltages.

3. The method of claim 1, wherein the transflective liquid crystal display further comprises a signal processing logic for controlling the settings of the driving voltages.

4. The method of claim 3, wherein the signal processing logic utilizes at least one set of program codes for controlling the settings of the driving voltages and the on and off function of the backlight source.

5. The method of claim 3, wherein the signal processing logic further controls the on and off function of the backlight source.

6. The method of claim 5, wherein the signal processing logic sets the driving voltages in a first driving voltage range when the signal processing logic receives an instruction to turn the backlight source on.

7. The method of claim 5, wherein the signal processing logic sets the driving voltages in a second driving voltage range when the signal processing logic receives an instruction to turn the backlight source off.

8. The method of claim 3, wherein the signal processing logic is a digital signal processing (DSP) IC.

9. The method of claim 1, wherein the first driving voltage range is set according to the gray level performance of the images produced by the transflective liquid crystal display, and the second driving voltage range is set according to the readability of the images produced by the transflective liquid crystal display.

10. The method of claim 1, wherein the second driving voltage range provides an electricity-saving function to the transflective liquid crystal display.

11. The method of claim 10, wherein the maximum value of the second driving voltage range is less than the maximum value of the first driving voltage range.

12. The method of claim 1, wherein the voltage distribution of the second driving voltage range is greater than the voltage distribution of the first driving voltage range.

13. The method of claim 1 further comprising setting the driving voltages in a third driving voltage range when the back light is half on, wherein the third driving voltage range is different from the first and second driving voltage ranges.