Under-Display Camera Panel With Variable Black Matrix Holes
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Solution Overview
Problem
In display panels with under-display cameras, the field of view (FOV) is reduced due to light absorption by the side surfaces of open spaces in the black matrix, compromising visibility and usability.
Innovation Solution
A display panel design with varying hole densities in the black matrix around a photosensor, combined with a light blocking material, to enhance light transmission and control luminance based on ambient brightness, thereby improving FOV and reducing unintended malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the black matrix is made open to secure photosensor transmittance, then light transmission to the photosensor is improved, but light is absorbed by the side surfaces of the open space, reducing the field of view
Solution Approach 1:
The black matrix is designed with different hole densities in different regions: a first region with lower hole density corresponding to the photosensor area, and a second region with higher hole density in surrounding areas. This local differentiation allows optimal light transmission to the photosensor while reducing parasitic light absorption in peripheral regions, thereby improving the field of view without compromising sensor performance.
2Ease of manufacture
If the black matrix has uniform hole density, then manufacturing is simplified, but visibility and field of view are compromised due to excessive light absorption in certain areas
Solution Approach 1:
The black matrix employs spatially varying hole density with a first region having a first density and a second region having a second density. This local quality variation optimizes light transmission characteristics in different areas, reducing harmful light absorption in the second region while maintaining adequate light transmission to the photosensor in the first region, thereby improving overall visibility and field of view.
3Illumination intensity
If light blocking material is added to control luminance, then screen brightness consistency is improved, but device complexity increases
Solution Approach 1:
A light blocking material is introduced as an intermediary element between the black matrix and the photosensor or display elements. This material selectively blocks excess light in specific regions, controlling luminance distribution and maintaining consistent screen brightness across different viewing angles and lighting conditions, while the overall structural complexity remains manageable through strategic placement rather than comprehensive modification.
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 solution enhances the field of view and maintains consistent screen brightness across different angles and lighting conditions, improving the overall usability of electronic devices with under-display cameras.
Implementation Method 1
the black matrix may have a first plurality of holes having a first density in the first region, and a second plurality of holes a second density in the second region
Implementation Method 2
when light is transmitted through the open space, the light may be absorbed by the side surfaces of the open space
Implementation Method 3
The electronic device may further include a light blocking material provided on at least part of the first region of the display panel
Data Source
AI summary
An electronic device may include a housing, a display panel including a plurality of color pixels and a black matrix provided between the plurality of color pixels, and a photosensor provided between the housing and the display panel, wherein the display panel has a first region corresponding to the photosensor and a second region surrounding the first region, the black matrix has a first plurality of holes having a first density in the first region, and a second plurality of holes a second density in the second region, and the second density is higher than the first density.