Electronic device display with a backlight and control circuitry that corrects pixel data to reduce transition artifacts

Patent metadata

Field	Value
Publication number	US-10866458-B2
Application number	US-201916439453-A
Country	US
Kind code	B2
Filing date	Jun 12, 2019
Priority date	Oct 26, 2018
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

An electronic device may include display layers such as liquid crystal display layers and a backlight unit that provides illumination for the display layers. The backlight unit may include light-emitting diodes that emit light into the edge of a light guide film. To minimize the inactive area of the display, the light-emitting diodes may be tightly spaced to approximate a line light source instead of point light sources. Color and/or luminance compensation layers may be incorporated at various locations within the backlight structures to ensure that the backlight provided to the display layers is homogenous. A thin-film transistor layer of the display may be coupled to a printed circuit board by a flexible printed circuit. The flexible printed circuit may have additional solder mask layers to improve robustness, may include encapsulation, and may have traces with a varying pitch.

First claim

What is claimed is:

1. An electronic device comprising:
an array of display pixels;
display driver circuitry configured to provide image data to the array of display pixels; and
control circuitry including a content processor that is configured to:
receive uncorrected pixel data for a current frame; and
generate modified pixel data for the current frame based on the uncorrected pixel data for the current frame and pixel data for a previous frame using at least one look-up table, wherein the uncorrected pixel data includes black pixel data for a first display pixel, wherein the pixel data for the previous frame includes white pixel data for the first display pixel, and wherein the white pixel data for the first display pixel includes at least one sub-pixel value that is truncated.

2. The electronic device defined in claim 1 , wherein the control circuitry is configured to provide the modified pixel data to the display driver circuitry to be displayed on the array of display pixels.

3. The electronic device defined in claim 1 , wherein the at least one sub-pixel value is truncated for a white point adjustment.

4. The electronic device defined in claim 1 , wherein the white pixel data for the first display pixel includes a first value for a green sub-pixel, a second value for a red sub-pixel value that is lower than the first value, and a third value for a blue sub-pixel that is lower than the first value.

5. The electronic device defined in claim 4 , wherein the uncorrected pixel data for the current frame has a value of 0 for the green, red, and blue sub-pixels, and wherein the modified pixel data for the current frame includes a fourth value for the green sub-pixel that is equal to 0, a fifth value for the red sub-pixel that is greater than 0, and a sixth value for the blue sub-pixel that is greater than 0.

6. An electronic device comprising:
an array of display pixels;
display driver circuitry configured to provide image data to the array of display pixels; and
control circuitry including a content processor that is configured to:
receive uncorrected pixel data for a current frame; and
generate modified pixel data for the current frame based on the uncorrected pixel data for the current frame and pixel data for a previous frame using at least one look-up table, wherein the uncorrected pixel data includes black pixel data for a first display pixel, wherein the pixel data for the previous frame includes white pixel data for the first display pixel, and wherein the white pixel data for the first display pixel includes a first value for a first sub-pixel, a second value for a second sub-pixel value that is lower than the first value, and a third value for a third sub-pixel that is lower than the first value.

7. The electronic device defined in claim 6 , wherein the uncorrected pixel data for the current frame has a value of 0 for the first, second, and third sub-pixels, and wherein the modified pixel data for the current frame includes a fourth value for the first sub-pixel that is equal to 0, a fifth value for the second sub-pixel that is greater than 0, and a sixth value for the third sub-pixel that is greater than 0.

8. An electronic device comprising:
an array of display pixels;
display driver circuitry configured to provide image data to the array of display pixels; and
control circuitry including a content processor that is configured to:
receive uncorrected pixel data for a current frame; and
generate modified pixel data for the current frame based on the uncorrected pixel data for the current frame and pixel data for a previous frame using at least one look-up table, wherein generating the modified pixel data for the current frame based on the uncorrected pixel data for the current frame and the pixel data for the previous frame using the at least one look-up table comprises increasing target pixel values for red and blue sub-pixels in pixels undergoing white-to-black transitions.

Assignees

• Apple Inc

Inventors

• Lu Shin-Ying
• Xu Daming
• Gorkhali Suraj P
• Herranz Adria Fores
• Son Mookyung
• Suh Heesang
• Yin Victor H
• Holsteen Aaron L
• Li Xiaokai
• Ge Zhibing

Classifications

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G3/006

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title

• H01R4/04

  using electrically conductive adhesives · CPC title