Display Substrate Light-Blocking Patterns for Fingerprint Recognition
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Solution Overview
Problem
The existing display substrates with fingerprint recognition functions face instability in light transmittance due to irregular and uncertain light transmission gaps, affecting the preparation yield and accuracy of fingerprint acquisition and recognition.
Innovation Solution
A display substrate design featuring a base substrate with a drive circuit layer, a first electrode layer containing light-blocking patterns that correspond to and overlap with light transmission gaps, and a pixel definition layer with sub-pixel openings, ensuring stable light transmittance and simplifying the preparation process by using the same material and patterning process for light-blocking and electrode patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light transmission gaps are provided for fingerprint recognition, then fingerprint recognition function is enabled, but light transmittance becomes unstable and preparation yield decreases
Solution Approach 1:
The patent applies local quality by differentiating the function of different regions within the drive circuit layer. Specifically, certain regions are designated as light transmission gaps (without transistor structures) to enable fingerprint recognition, while other regions maintain complete circuit structures for display driving. This spatial differentiation of functional quality allows the substrate to simultaneously achieve fingerprint recognition capability and stable light transmittance in display regions.
Solution Approach 2:
The drive circuit layer is segmented into multiple functional regions: light transmission gaps for fingerprint recognition and complete circuit regions for display driving. This segmentation separates the fingerprint sensing function from the display driving function, allowing independent optimization of each region's light transmittance characteristics and reducing mutual interference.
2Adaptability or versatility
If irregular light transmission gaps are used for fingerprint recognition, then fingerprint recognition is enabled, but measurement precision and preparation yield are affected
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric parameters of the light transmission gaps, including their position, size, and distribution pattern. By carefully controlling these parameters, the design achieves sufficient light transmittance for fingerprint recognition while minimizing impact on display performance and maintaining preparation yield.
3Manufacturing precision
If separate processes are used for light-blocking patterns and electrode patterns, then functional precision is maintained, but manufacturing complexity increases
Solution Approach 1:
The patent applies merging by integrating the formation of light-blocking patterns and electrode patterns into a single patterning process. The patterns are designed with appropriate spacing and geometric features that allow both functions to be achieved in one exposure and development cycle, eliminating the need for separate patterning steps while maintaining the required precision for both light blocking and electrical connectivity.
4Object-affected harmful factors
If light-blocking patterns overlap with sub-pixel openings, then light transmission is blocked, but display quality deteriorates
Solution Approach 1:
The patent applies local quality by ensuring that light-blocking patterns are positioned only in regions where blocking is needed (outside sub-pixel openings) while maintaining transparency or appropriate optical properties in regions corresponding to sub-pixel openings. This spatial differentiation ensures effective light leakage control in non-display areas without compromising display quality.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate has a display side and includes a base substrate, a drive circuit layer, a first electrode layer, and a pixel definition layer. The drive circuit layer includes a plurality of first gaps to allow light from the display side to transmit therethrough. The first electrode layer includes a plurality of first electrode patterns and a plurality of light-blocking patterns. The pixel definition layer includes a plurality of sub-pixel openings exposing the plurality of first electrode patterns, respectively. In a direction perpendicular to the base substrate, at least a portion of the plurality of light-blocking patterns do not overlap with the plurality of sub-pixel openings, and correspond to and at least partially overlapped with at least a portion of the plurality of first gaps, respectively.