Display Substrate Light-Blocking Pattern for Transistor Channel Protection
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Solution Overview
Problem
Current display technologies, such as AMOLED, face challenges in achieving superior performance and efficiency due to issues with transistor switching characteristics and light-blocking patterns, which affect the display's overall performance and reliability.
Innovation Solution
A display substrate design featuring a base with pixel units arranged in rows and columns, including sub-pixels with specific transistor configurations and a light-blocking pattern that covers channel regions of certain transistors to prevent illumination and maintain switching characteristics, along with a planarization layer and conductive layers for signal lines and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the channel regions of transistors are exposed to light, then the display can achieve better light emission efficiency, but the switching characteristics of the transistors deteriorate due to photo-induced effects
Solution Approach 1:
The pixel structure is divided into distinct functional regions: a light-emitting region containing the light-emitting element, and a non-light-emitting region containing the transistor channel regions. This spatial segmentation allows the light-emitting region to be exposed to light for efficient emission while the transistor channel regions are protected from light exposure to maintain switching characteristics.
Solution Approach 2:
A light-blocking layer is introduced as an intermediary component between the light source and the transistor channel regions. This layer selectively blocks light from reaching the channel regions while allowing light to pass through to the light-emitting region, thereby resolving the contradiction between light emission efficiency and transistor reliability.
2Reliability
If the pixel structure is expanded to include more transistor components for compensation, then the display performance and reliability are improved, but the pixel area and device complexity increase
Solution Approach 1:
Multiple transistor components (driving transistor, reset transistor, compensation transistor) are merged into a single integrated pixel structure with shared elements. The light-blocking layer serves multiple functions by simultaneously protecting all transistor channel regions, and the pixel structure integrates signal lines and transistor components in a compact arrangement that reduces overall pixel area while maintaining compensation functionality.
Solution Approach 2:
The light-blocking layer is designed as a multi-functional element that simultaneously serves as a protective layer for transistor channel regions, a structural component of the pixel, and a signal transmission pathway. This multi-functionality allows the structure to provide compensation capabilities without proportionally increasing pixel area.
3Reliability
If light-blocking patterns are added to protect transistor channel regions, then transistor switching characteristics are maintained, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The light-blocking patterns are merged with existing pixel structures such as the electrode layers or insulation layers. By integrating the light-blocking function into already-present structural elements rather than adding completely separate components, the patent maintains transistor reliability while minimizing increases in device complexity.
Solution Approach 2:
Existing structural layers in the display device are designed to serve multiple functions: structural support, electrical insulation, and light blocking. This multi-functionality allows the patent to protect transistor channel regions without adding dedicated light-blocking components, thereby reducing the net increase in device complexity.
Data Source
AI summary
The present disclosure provides a display substrate and a display device. The display substrate includes: a base; multiple pixel units arranged in multiple rows along a first direction and multiple columns along a second direction and arranged on the base, and each pixel unit includes multiple sub-pixels, each sub-pixel includes a pixel circuit; an active semiconductor layer including a channel region, a source doping region and a drain doping region of each transistor in each pixel circuit, the pixel circuit includes a driving transistor, a data writing transistor, a storage capacitor, a threshold compensation transistor, a first reset transistor, a light-emitting device; a first light-blocking pattern arranged on a side of the active semiconductor layer away from the base, an orthographic projection of the first light-blocking pattern on the base covers orthographic projections of channel regions of the first reset transistor and the threshold compensation transistor on the base.