DISPLAY AND BACKLIGHT CONTROLLER AND DISPLAY SYSTEM USING THE SAME

• US 20170047023A1
• Filed: 08/11/2015
• Published: 02/16/2017
• Est. Priority Date: 08/11/2015
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: MATSUI, Yoshikazu, YOSHIGA, Masahiro
• Granted Patent: US 9,779,673 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

A display system is provided with a low frequency driving mode. A low frequency display interval of the display system is divided into a charge period and a suspend period in the low frequency driving mode. A backlight brightness of the display system is changed in the suspend period.

Claims

1. A display system, comprising:

a display panel including a plurality of scan lines, a plurality of source lines intersecting the scan lines, and a plurality of pixels arranged at intersections of the scan lines and the source lines;

a backlight module coupled to the display panel for projecting light to the pixels of the display panel, the light having a backlight brightness; and

a display and backlight controller receiving an input image data and connected to the display panel and the backlight module for providing a low frequency driving mode,

wherein, in the low frequency driving mode, a display interval in one frame is divided into a charge period and a suspend period, and the backlight brightness is changed in the suspend period.

2. The display system as claimed in claim 1, wherein the backlight brightness starts to be changed at a first specific time in a second half of the suspend period.

3. The display system as claimed in claim 2, wherein the backlight brightness finishes to be changed at a second specific time in a first half of a charge period in a successive frame.

4. The display system as claimed in claim 1, wherein the period of the backlight brightness being changed is equal to or longer than a half of the charge period and is equal to or shorter than a half of the suspend period.

5. The display system as claimed in claim 1, wherein the backlight brightness is changed from a first brightness to a second brightness.

6. The display system as claimed in claim 1, wherein the second brightness is greater than the first brightness

7. The display system as claimed in claim 1, wherein the second brightness is smaller than the first brightness.

8. The display system as claimed in claim 5, wherein a backlight change ratio defined by a ratio of the first brightness to the second brightness is between 0.8 and 1.2.

9. The display system as claimed in claim 1, wherein the backlight brightness is changed at least two times in the suspend period of the display interval in one frame.

10. The display system as claimed in claim 9, wherein the backlight brightness is changed from a first brightness to a second brightness in a first period, and the backlight brightness is changed from the second brightness to a third brightness in a second period.

11. The display system as claimed in claim 10, wherein the summation of first period and the second period is equal to or longer than a half of the charge period and is equal to or shorter than a half of the suspend period.

12. The display system as claimed in claim 1, wherein the backlight brightness is changed to a specific value according to a predominant gray level of the input image data.

13. The display system as claimed in claim 1, wherein the display and backlight controller provides either the low frequency driving mode or a normal driving mode.

14. The display system as claimed in claim 13, wherein the backlight controller provides the low frequency driving mode if the input image data is determined as a still image or provides the normal driving mode if the input image data is determined as a moving image.

15. The display system as claimed in claim 13, wherein the display interval in one frame in the low frequency driving mode is longer than that in the normal driving mode.