Electronic device display with charge accumulation tracker
First Claim
1. An electronic device, comprising:
- a display;
control circuitry that generates image frames that are displayed on the display; and
a charge accumulation tracker that evaluates the image frames to identify when a risk of excessive charge accumulation in the display is present, wherein the charge accumulation tracker computes a median gray level for all pixels in a given one of the image frames and computes a charge accumulation metric for the given one of the image frames based on inputs including the median gray level, and wherein the charge accumulation tracker applies a weighting function to the median gray level when computing the charge accumulation metric.
1 Assignment
0 Petitions
Accused Products
Abstract
An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.
-
Citations
16 Claims
-
1. An electronic device, comprising:
-
a display; control circuitry that generates image frames that are displayed on the display; and a charge accumulation tracker that evaluates the image frames to identify when a risk of excessive charge accumulation in the display is present, wherein the charge accumulation tracker computes a median gray level for all pixels in a given one of the image frames and computes a charge accumulation metric for the given one of the image frames based on inputs including the median gray level, and wherein the charge accumulation tracker applies a weighting function to the median gray level when computing the charge accumulation metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A display that displays image frames, comprising:
-
an array of liquid crystal display pixels that displays the image frames, wherein the image frames include multiple subregions; and display driver circuitry that implements a charge accumulation tracker, wherein the charge accumulation tracker receives as inputs gray level values for the liquid crystal display pixels in each subregion and frame duration information, wherein the charge accumulation tracker computes a charge accumulation metric for each subregion as a product of the gray level values for the liquid crystal display pixels in the subregion and the frame duration information, wherein the charge accumulation tracker analyzes the image frames to identify when there is a risk of excess charge accumulation in any of the subregions, and wherein the display driver circuitry is configured to adjust a refresh rate for the image frames in response to detection of a risk of excess charge accumulation in any of the subregions. - View Dependent Claims (14)
-
-
15. A display that displays image frames, comprising:
-
an array of liquid crystal display pixels that displays the image frames; and display driver circuitry that implements a charge accumulation tracker, wherein the image frames each include multiple subregions and wherein the charge accumulation tracker separately analyzes each of the subregions of the image frames to identify when there is a risk of excess charge accumulation in the array, wherein the charge accumulation tracker receives as inputs gray level values for the liquid crystal display pixels in each subregion, and wherein the charge accumulation tracker computes an average gray level for each subregion. - View Dependent Claims (16)
-
Specification