Display Substrate Groove Design for Optical Compensation Accuracy
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Solution Overview
Problem
In display devices using optical compensation, the divergent light emitted by each light-emitting device causes inaccurate detection of luminous efficiency by photosensitive devices, leading to inadequate optical compensation due to light interference from adjacent units.
Innovation Solution
A display substrate design featuring a groove in the interlayer insulating layer, where the light-emitting unit covers the groove, allowing the photosensitive unit to receive light from both top and side surfaces, and a bottom emission type light-emitting unit with a reflective electrode to minimize light interference from adjacent pixel units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photosensitive device is used to detect light emitted by a light-emitting device for optical compensation, then the luminous efficiency can be monitored, but light interference from adjacent pixel units causes inaccurate detection
Solution Approach 1:
The pixel unit is segmented into distinct functional regions: a light-emitting region and a photosensitive region. The photosensitive unit is positioned in a non-light-emitting area adjacent to the light-emitting unit, physically separating the detection function from the light emission function. This spatial segmentation prevents the photosensitive unit from receiving light from adjacent pixel units while maintaining its ability to detect light from its corresponding light-emitting unit.
Solution Approach 2:
A black matrix structure serves as an intermediary element between adjacent pixel units. This black matrix absorbs or blocks stray light from adjacent light-emitting units, preventing it from reaching the photosensitive unit. The black matrix acts as a light-blocking mediator that eliminates the harmful light interference while allowing the photosensitive unit to accurately detect light from its designated light-emitting unit.
2Reliability
If optical compensation is performed on the entire display panel, then mura can be compensated, but the process is complex and time-consuming
Solution Approach 1:
The optical compensation process is segmented from a global panel-level operation to a localized pixel-level operation. Each pixel unit independently performs optical compensation by detecting light from its corresponding light-emitting unit and adjusting its drive signal accordingly. This segmentation eliminates the need for complex global compensation processes while maintaining effective mura correction, as each pixel autonomously compensates for its own optical characteristics.
Solution Approach 2:
Each pixel unit is equipped with its own photosensitive unit that enables it to perform self-diagnosis and self-compensation. The photosensitive unit detects the actual light output of the light-emitting unit, and the pixel unit autonomously adjusts its drive signal to compensate for variations in luminous efficiency. This self-service mechanism eliminates the need for external compensation equipment and complex manufacturing processes, simplifying the overall system while improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the accuracy of luminous efficiency detection and optical compensation by reducing light interference between adjacent pixel units, improving the overall performance of the display panel.
Implementation Method 1
a photosensitive unit for detecting light emitted by the light-emitting unit
Implementation Method 2
a bottom emission type light-emitting unit with a reflective electrode to minimize light interference from adjacent pixel units
Data Source
AI summary
A display substrate according to an embodiment of the present disclosure comprises a substrate and a plurality of pixel units on the substrate, at least one of the plurality of pixel units comprising a light-emitting unit, a photosensitive unit for detecting light emitted by the light-emitting unit, and an interlayer insulating layer between the photosensitive unit and the light-emitting unit, wherein the interlayer insulating layer comprises a groove, an orthogonal projection of which on the substrate does not coincide with an orthogonal projection of the photosensitive unit on the substrate, and the light-emitting unit covers the groove.