Color-Grouped Display Pixel Sensing for Temperature Compensation
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Solution Overview
Problem
Display apparatuses experience flicker and low-grayscale stains due to differences in driving characteristics of pixels, such as mobility and threshold voltages, and these differences are exacerbated by temperature variations, leading to non-uniform pixel performance.
Innovation Solution
A display apparatus and method that adjusts the timing of sensing operations to ensure pixels of the same color are sensed at similar temperatures, thereby reducing data deviation and improving uniformity by compensating for variations in threshold voltage and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing operations are performed sequentially on all pixels without temperature consideration, then the sensing process is simple and fast, but temperature variations cause data deviation and display defects such as flicker and low-grayscale stains
Solution Approach 1:
The pixel array is segmented into multiple groups based on color (e.g., red, green, blue pixel groups) and sensing timing. The panel driver performs sensing operations on different color groups sequentially, allowing temperature compensation for each group while maintaining manageable operation complexity.
Solution Approach 2:
The panel driver performs sensing operations on pixels of the same color before temperature variations significantly affect different color groups. By completing sensing for one color group before moving to the next, the system captures data when temperature conditions are more uniform, reducing data deviation.
2Reliability
If sensing operations are performed on all pixels simultaneously, then the driving time is short and productivity is high, but temperature-induced variations in pixel characteristics cannot be compensated
Solution Approach 1:
The sensing operation is divided into multiple sub-operations针对不同 color groups. This segmentation enables temperature compensation for each group while maintaining overall sensing efficiency through parallel processing capabilities of the panel driver.
Solution Approach 2:
The panel driver performs sensing operations in periodic cycles, alternating between different color pixel groups. Each cycle focuses on one color group, allowing temperature stabilization and compensation before moving to the next group, thereby improving reliability without excessive time penalty.
3Measurement precision
If pixels are sensed at different temperatures without compensation, then the sensing process is simple, but driving characteristics such as mobility and threshold voltage vary causing non-uniform pixel performance
Solution Approach 1:
The system performs sensing operations on pixels of the same color before temperature drift significantly affects subsequent groups. This preliminary sensing captures accurate pixel characteristics under relatively uniform temperature conditions, enabling effective compensation.
Solution Approach 2:
The panel driver changes the timing parameters of sensing operations based on pixel color groups. By adjusting when each color group is sensed relative to the display refresh cycle, the system accounts for temperature variations and maintains uniform pixel characteristic measurements.
Data Source
AI summary
A display apparatus includes: a display panel including a plurality of pixels and a panel driver for applying a data voltage to pixels by the same pixel-column and performing a sensing operation, which senses the pixels receiving the data voltage. The plurality of pixels include first pixels having a first color and second pixels having a second color different from the first color. After the sensing operation is performed on a first odd-numbered group of the first pixels, the sensing operation is performed on a first even-numbered group of the first pixels. After the sensing operation is performed on the first even-numbered group of the first pixels, the sensing operation is performed on a second odd-numbered group of the second pixels. After the sensing operation is performed on the second odd-numbered group, the sensing operation is performed on a second even-numbered group of the second pixels.