IMAGE DISPLAY APPARATUS

• US 20200135101A1
• Filed: 03/26/2018
• Published: 04/30/2020
• Est. Priority Date: 06/21/2017
• Status: Active Grant

• Current Assignee: Shenzhen Torey Microelectronic Technology Co., Ltd.
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: YAMAGUCHI, MASAYUKI
• Granted Patent: US 10,885,840 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• 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 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An image display apparatus includes: a region division unit that divides a display surface into a plurality of regions; a degree-of-influence calculation unit that calculates a first degree of influence representing a degree of influence of a brightness level of each of the regions on a brightness level of a respective region adjacent to the region; and a brightness correction unit that corrects a brightness level of each pixel. Influence of not only a location of connection in wiring in a display unit with an input terminal of a power supply for the display unit but also a wiring configuration of the display unit is reflected on the first degree of influence.

Claims

1. An image display apparatus that displays an image on a display unit based on image data, comprising:

a region division unit that divides a display surface of the display unit into a plurality of regions;

a degree-of-influence calculation unit that calculates a first degree of influence representing a degree of influence of a brightness level of each of the regions on a brightness level of a respective region adjacent to the region, the regions resulting from the division by the region division unit; and

a brightness correction unit that corrects a brightness level of each of pixels in the image data based on the first degree of influence,

wherein influence of not only a location of connection in wiring in the display unit with an input terminal of a power supply for the display unit but also a wiring configuration of the display unit is reflected on the first degree of influence,

wherein the region division unit includes;

a brightness-level-total calculation unit that calculates totals of brightness levels of the pixels, the totals being calculated for respective lines of the pixels on the display surface; and

a difference calculation unit that calculates differences in the totals of the brightness levels between mutually adjacent lines of the pixels, and

wherein the region division unit selects a difference that is more than or equal to a first threshold and the number of which is not more than a predetermined number from a highest difference among the differences calculated by the difference calculation unit, and the region division unit sets a border between the lines of the pixels corresponding to the selected difference to a border for the division.

3. The image display apparatus according to claim 1, further comprising:

a memory unit that stores a second degree of influence representing a degree of influence of a brightness level of each of a plurality of uniform regions on a brightness level of a respective region adjacent to the region in a state where the uniform regions result from division performed on the display surface of the display unit; and

a regional brightness-level-total calculation unit that calculates totals of the brightness levels of the pixels in each region resulting from the division by the region division unit,

wherein the degree-of-influence calculation unit calculates the first degree of influence based on each of the totals calculated by the regional brightness-level-total calculation unit and the second degree of influence on one of the plurality of uniform regions that includes a pixel in a center of the region resulting from the division by the region division unit.

4. The image display apparatus according to claim 1,

wherein the brightness correction unit calculates a correction value for correcting the brightness level of each of the pixels in the image data based on the first degree of influence and corrects gradations of sub pixels included in the pixel in the image data based on the correction value.

5. The image display apparatus according to claim 1,

wherein the display unit displays an image for each of frames, and

wherein the brightness correction unit corrects a brightness level of each of pixels in image data in a target frame in a case where the image data regarding a most recent frame represents a still image and where image data regarding frames from a frame three frames before the target frame to the target frame consecutively represents a still image,

each of the still images being represented by the corresponding image data,

if a maximum value of a difference between a location of a border in the most recent frame between the regions resulting from the division by the region division unit and a location of a border in a frame one frame before the most recent frame between the regions resulting from the division by the region division unit is less than a second threshold, and

if a difference between a maximum value of the differences calculated by the difference calculation unit for the most recent frame and a maximum value of the differences calculated by the difference calculation unit for the frame one frame before the most recent frame is less than a third threshold.

6. The image display apparatus according to claim 3, further comprising

a brightness calculation unit that calculates the brightness level of each of the pixels in the image data based on the gradations of the sub pixels included in the pixel in the image data.

2. (canceled)