Liquid crystal display apparatus

• US 20060279523A1
• Filed: 08/23/2006
• Published: 12/14/2006
• Est. Priority Date: 09/08/2000
• Status: Abandoned Application

• Current Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Maeda, Takeshi, Nitta, Hiroyuki, Kawabe, Kazuyoshi, Hirakata, Junichi
• Application Number:
  US11/508,202
• Publication Number:
  US 20060279523A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• CPC Class Codes: G09G 3/2077 by a combination of two or more gradation control methods
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display apparatus for executing display in accordance with an image signal, including, a display panel, a plurality of light-sources for illuminating the display panel, and a control circuit for controlling light-emission luminance of the light-sources. The light-emission luminance includes a first light-emission luminance and a second light-emission luminance, and the display panel includes a plurality of display areas, wherein each of the display areas corresponding to each of the light-sources. The control circuit controls switching timing between the first light-emission luminance and the second light-emission luminance of each of the light-sources in accordance with rewriting timing of the image signal concerned with each of the display areas.

Claims

1. A display apparatus for executing display in accordance with an image signal, comprising:

a display panel;

a plurality of light-sources for illuminating the display panel; and

a control circuit for controlling light-emission luminance of the plurality of light-sources;

wherein the light-emission luminance includes a first light-emission luminance and a second light-emission luminance, the display panel includes a plurality of display areas, each of the display areas corresponding to each of the light-sources, and the control circuit controls switching timing between the first light-emission luminance and the second light-emission luminance of each of the light-sources in accordance with rewriting timing of the image signal concerned with each of the display areas.

2. A display apparatus according to claim 1, wherein the rewriting timing of the image signal corresponding to each of the display areas is different from the switching timing between the first light-emission luminance and the second light-emission luminance of each of the light-sources and are shifted with each other.

3. A display apparatus according to claim 1, wherein after a predetermined period has passed since the image signal is rewritten corresponding to each of the display areas, the first light-emission luminance is switched to the second light-emission luminance of each of the light sources.

4. A display apparatus according to claim 1, wherein the first light-emission luminance is a light-out luminance and the second light-emission luminance is a light-on luminance.

5. A display apparatus according to claim 1, wherein the control circuit controls the light-emission luminance of the plurality of light sources irrespective of RGB of the image signal.

6. A display apparatus for executing display in accordance with an image signal, comprising:

a display panel;

a plurality of light-sources for illuminating the display panel; and

a control circuit for controlling a first light-emission luminance and a second light-emission luminance of each of the light-sources respectively;

wherein a phase of a switching frequency between the first light-emitting luminance and the second light-emitting luminance of the plurality of light sources are different from one another.

7. A display apparatus according to claim 6, wherein a phase of switching frequency between the first light-emitting luminance of each of the light sources is different from phase of a rewriting time-period of the image signal for display areas of the display panel which corresponds to each of the light sources.

8. A display apparatus according to claim 6, wherein the phase of switching frequency between the first light-emitting luminance and the second light-emitting luminance of each of the light-sources is slower compared to a phase of a rewriting time-period of the image signal concerned with display areas of the display panel.

9. A display panel according to claim 6, wherein the first light-emission luminance is a light-out luminance and the second light-emission luminance is a light-on luminance.

10. A display apparatus according to claim 6, wherein the control circuit controls the first light-emitting luminance and the second light-emitting luminance of each of the light sources respectively, irrespective of RGB of the image signal.

11. A display apparatus for executing display in accordance with image signal, comprising:

a display panel;

a plurality of light sources for illuminating the display panel; and

a control circuit for controlling light-up/light-off of each of the light-sources;

wherein the display panel includes a plurality of display areas, each of the display areas corresponding to each of the light-sources; and

wherein the control circuit lights up each of the light sources, after a predetermined time has passed since the image signal is rewritten corresponding to each of the display areas.