Display Substrate With Relocated Color Filter For Fingerprint Recognition
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Solution Overview
Problem
Existing OLED display panels integrated with OPD for fingerprint recognition face challenges in achieving high display effect and accurate fingerprint recognition due to the influence of the color filter layer on light emission and the need to sacrifice pixel aperture ratios during the evaporation process.
Innovation Solution
A display substrate design featuring a repetitive unit arrangement of light-emitting elements and photoelectric conversion elements, optimized with a color filter layer and black matrix configuration, which improves light collimation and reduces stray light, enhancing both display quality and fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter layer is provided on the light-emitting side of OLED display substrate, then color gamut and color purity are improved, but light emission is influenced and display effect is compromised
Solution Approach 1:
The patent extracts the color filter layer from the conventional position on the light-emitting side and relocates it to the substrate side, below the OLED structure. This separation allows the OLED to emit light without direct interference from the color filters, improving light emission efficiency while maintaining color gamut through the relocated filter position.
Solution Approach 2:
The patent changes the spatial dimension of the color filter layer placement from the lateral dimension (on the light-emitting side) to the vertical dimension (on the substrate side beneath the OLED). This dimensional repositioning resolves the conflict between color filtration and light emission by placing the filter in a different spatial plane where it no longer directly blocks or interferes with the light path.
2Adaptability or versatility
If pixel aperture ratios are sacrificed during evaporation process, then OPD for fingerprint recognition can be integrated, but display quality and recognition accuracy are compromised
Solution Approach 1:
The patent segments the display substrate into distinct functional regions: light-emitting elements for display and photoelectric conversion elements for fingerprint recognition. This segmentation allows both functions to coexist without compromising each other, as each element type is optimally designed for its specific purpose without requiring aperture ratio sacrifices.
Solution Approach 2:
The patent creates a multi-functional display substrate that simultaneously performs display and fingerprint recognition functions. By integrating photoelectric conversion elements alongside light-emitting elements in the same substrate structure, the system achieves universal functionality without sacrificing the performance of either function, as each element maintains its optimal design characteristics.
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
The proposed solution improves the display effect by optimizing light emission and reduces the influence of the color filter layer, while also enhancing fingerprint recognition precision and efficiency, thus meeting the requirements for safer fingerprint payment systems.
Implementation Method 1
each repetitive unit includes a first light-emitting element, second light-emitting elements, a third light-emitting element... the first light-emitting element, the second light-emitting elements, and the third light-emitting element are sequentially arranged along a first direction
Implementation Method 2
the photoelectric conversion elements and the second light-emitting elements are adjacently arranged and distributed in one-to-one correspondence
Data Source
AI summary
A display substrate, including repetitive units; where each repetitive unit includes first, second and third light-emitting element and photoelectric conversion elements; the first and third light-emitting elements are of a same number; the second light-emitting elements and the photoelectric conversion elements are of a same number; second light-emitting elements are twice as many as the first light-emitting element; the first, second and third light-emitting elements are sequentially arranged along first direction; the second light-emitting elements and the photoelectric conversion elements are sequentially arranged along second direction, respectively; an angle between the first and second direction is >0° and ≤90°; the photoelectric conversion elements and the second light-emitting elements are adjacently arranged and distributed in one-to-one correspondence; any set of corresponding second light-emitting element and photoelectric conversion element are arranged along the first direction; the first or third light-emitting element is located between two adjacent photoelectric conversion elements.