Display Device Pixel Compensation via Segmented Sensing
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Solution Overview
Problem
Current display devices face challenges in reducing sensing time, leading to increased occurrence of spots and afterimages, and struggle to maintain constant display luminance due to inefficiencies in driving methods.
Innovation Solution
The display device incorporates a sensing driver that extracts sensing values from pixels to detect changes in transistor mobility and threshold voltage, allowing for compensation calculations and adjusted image data to accelerate pixel compensation, while also incorporating a gamma voltage table to maintain constant luminance during active sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing period is extended to improve pixel compensation accuracy, then the display luminance becomes unstable and spots/afterimages occur, but if the sensing period is reduced to maintain stable luminance, then pixel compensation accuracy deteriorates
Solution Approach 1:
The pixel array is divided into multiple pixel rows, where odd-numbered pixel rows perform sensing operations during the sensing period while even-numbered pixel rows maintain normal display operations. This segmentation allows sensing and display to occur simultaneously in different spatial regions, eliminating the need to extend the overall sensing period while still achieving accurate pixel compensation.
Solution Approach 2:
The sensing operation is performed periodically on alternating pixel rows (odd rows in one frame, even rows in the next frame) rather than continuously on all rows. This periodic approach distributes the sensing time across multiple frames, maintaining stable luminance during each individual frame while still achieving comprehensive pixel compensation over time.
2Productivity
If sensing is performed during the emission period, then pixel compensation can be accelerated, but display luminance becomes unstable
Solution Approach 1:
The display panel is segmented into odd and even pixel rows that are driven differently. Odd pixel rows include both emission period and active sensing period, while even pixel rows include only emission period. This segmentation allows simultaneous sensing and display operations in different spatial regions, accelerating pixel compensation without compromising overall luminance stability.
Solution Approach 2:
The emission control line serves as an intermediary control mechanism that selectively activates the light emitting element in even pixel rows during the emission period while allowing sensing operations in odd pixel rows. This intermediary control enables the coexistence of display and sensing functions without direct interference.
Data Source
AI summary
A display device according to some embodiments includes pixels divided into pixel rows arranged in a horizontal direction, and including a light emitting element, and a first transistor for applying a drive current to the light emitting element, and a sensing driver configured to receive a sensing value extracted from one or more of the pixels, wherein at least one pixel row of the pixel rows is configured to be driven in one frame including an emission period in which the light emitting element emits light after a data voltage is applied to the pixels, and an active sensing period for sensing a characteristic of the first transistor.