Display Substrate Voltage Segmentation for Purple Defect Removal
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Solution Overview
Problem
Under-display camera designs in displays suffer from purple defects due to uneven lighting times of subpixels, particularly in the first display area where the pixel circuit is disposed in the bezel area, leading to inconsistent charging times and perceived purple display.
Innovation Solution
A display substrate with a first display area having different initialization voltage lines connected to subpixels to ensure consistent charging times by applying distinct initialization voltages to each subpixel, with the first initialization voltage line connected to the first subpixel receiving a higher voltage than the second, and optionally a third subpixel receiving a lower voltage than the second, to synchronize lighting times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the pixel circuit is disposed in the bezel area to achieve under-display camera design, then the screen-to-body ratio is improved, but the subpixels exhibit uneven lighting times causing purple defects
Solution Approach 1:
The patent applies different initialization voltages to different subpixels (first subpixel receives first initialization voltage, second subpixel receives second initialization voltage) to compensate for their different lighting characteristics. This local differentiation in electrical parameters corrects the uneven lighting times caused by the bezel-area circuit placement, eliminating purple defects while preserving the full-screen display quality.
2Reliability
If different initialization voltages are applied to different subpixels to correct lighting time differences, then the purple defect is eliminated, but the circuit complexity increases
Solution Approach 1:
The patent segments the initialization voltage supply by providing separate initialization voltage lines for different subpixels. The first initialization voltage line connects to the first subpixel and the second initialization voltage line connects to the second subpixel, allowing independent voltage control. This segmentation enables precise correction of lighting time differences without requiring complex global control circuits.
Data Source
AI summary
Embodiments of the present disclosure provide a display substrate, a driving method therefor, and a display apparatus. The display substrate has a display area and a bezel area. The display area includes a first display area and a second display area. The first display area has a light transmittance higher than that of the second display area. The first display area includes a plurality of pixel units distributed in an array, each pixel unit including a first subpixel and a second subpixel emitting different colors of light. The first display area includes a first initialization voltage line and a second initialization voltage line. The first initialization voltage line is electrically connected to the first subpixel, the second initialization voltage line is electrically connected to the second subpixel, and the first initialization voltage line and the second initialization voltage line are configured to receive different initialization voltages.