Dual Black Matrix Structure for Display Light Reflection Reduction
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Solution Overview
Problem
Display devices suffer from reduced image sharpness due to external light reflection from internal elements, which affects the quality of images displayed, especially in devices with touch panels and organic light emitting elements.
Innovation Solution
The implementation of a display device structure that includes a substrate with a pixel defining layer, organic light emitting elements, a first black matrix, a thin film encapsulation layer, touch sensor portions with mesh structures, a second black matrix, and a polarizing film, where the widths of the black matrices are strategically designed to absorb and block external light, reducing reflectance and enhancing image sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single black matrix is used in conventional display devices, then the structure is simple, but external light is not sufficiently blocked and image sharpness is reduced
Solution Approach 1:
The black matrix is divided into two separate layers: a first black matrix disposed on the pixel defining layer and a second black matrix disposed on the touch sensor portions. This segmentation allows each black matrix to be optimized for its specific function - the first for blocking light from pixel areas and the second for blocking light from touch sensor areas - thereby more effectively reducing external light reflection while maintaining structural organization.
Solution Approach 2:
The solution transitions from a single-plane black matrix structure to a multi-layer structure by adding the second black matrix on a different layer (on the touch sensor portions). This dimensional change in the structure allows simultaneous optimization for both pixel area light blocking and touch sensor area light blocking without interfering with each other's functionality.
2Object-affected harmful factors
If the black matrix width is increased to block more light, then light blocking improves, but the display area is reduced
Solution Approach 1:
By segmenting the black matrix into two layers with different widths and positions, the total light blocking capability is enhanced without requiring a uniform increase in black matrix width across the entire display. The first black matrix has width substantially equal to the pixel defining layer width, while the second black matrix has width greater than the branch portions of the mesh structure, allowing optimized light blocking at each location.
Solution Approach 2:
Each black matrix is designed with locally optimized width characteristics: the first black matrix width matches the pixel defining layer width for optimal pixel area coverage, while the second black matrix width is specifically designed to cover the touch sensor mesh branches. This local quality optimization ensures maximum light blocking where needed while preserving display area elsewhere.
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 effectively reduces light reflectance and improves image sharpness by absorbing external light, ensuring clearer image display and increased viewing angles, particularly in devices with touch sensing capabilities.
Implementation Method 1
a first black matrix disposed on the pixel defining layer... a second black matrix disposed on the touch sensor portions... effectively reduces light reflectance and improves image sharpness by absorbing external light
Implementation Method 2
a polarizing film disposed on the second black matrix
Data Source
AI summary
A display device includes a pixel defining layer disposed on a substrate and defining a plurality of openings, a plurality of organic light emitting elements disposed in the openings, a first black matrix disposed on the pixel defining layer, a thin film encapsulation layer disposed on the organic light emitting elements and the first black matrix, a plurality of touch sensor portions disposed on the thin film encapsulation layer and overlapping with the pixel defining layer, a second black matrix disposed on the touch sensor portions, and a polarizing film disposed on the second black matrix.