OLED Black Matrix Color Filter Light Shielding
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Solution Overview
Problem
Existing OLED displays face challenges in achieving optimal viewing angles and luminance efficiency due to issues with light leakage, color purity, and external light shielding, particularly when using polarizing plates and traditional light blocking methods.
Innovation Solution
The OLED display design incorporates a black matrix with a color filter on the thin film encapsulation member, where the sum of the color filter thickness and its distance from the organic light emitting member is less than the organic light emitting member's width, and the color filter's width is wider than the organic light emitting member, enhancing light distribution and external light shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used for external light shielding, then external light blocking is improved, but luminance efficiency deteriorates due to light absorption
Solution Approach 1:
The invention extracts and removes the polarizing plate from the OLED display structure, replacing it with a black matrix having a specific optical absorption coefficient that selectively blocks external light without absorbing emitted light, thereby eliminating the luminance efficiency loss caused by polarizing plates
Solution Approach 2:
The invention changes the optical parameters by specifying that the black matrix must have an optical absorption coefficient greater than 0.9 in the visible light range, transforming it into an effective external light shield that does not compromise the OLED's luminance efficiency
2Illumination intensity
If the color filter is placed closer to the organic light emitting member, then viewing angle is improved, but color purity deteriorates due to light leakage
Solution Approach 1:
The invention uses a composite structure combining the color filter layer with the black matrix layer, where the black matrix provides strong light absorption and the color filter provides color separation, achieving both wide viewing angle and high color purity through the synergistic effect of these two layers
Solution Approach 2:
The invention optimizes the distance parameter between the color filter and organic light emitting member, specifying it should be 10-50 μm, and controls the color filter thickness at 1-5 μm, achieving optimal balance between viewing angle and color purity through precise parameter control
3Object-affected harmful factors
If traditional light blocking methods are used, then external light shielding is improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges the external light shielding function with the existing black matrix structure that is already part of the OLED display, eliminating the need for separate light blocking components and simplifying the manufacturing process while maintaining effective external light shielding
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 improves viewing angles and luminance efficiency while reducing external light incidence, simplifying the manufacturing process and minimizing damage to the organic light emitting member, thereby increasing production yield and reducing costs.
Implementation Method 1
Holes injected from one electrode and electrons injected from the other electrode may be combined in the organic layer to form excitons. The excitons may generate energy such that light is emitted.
Implementation Method 2
a black matrix disposed on the thin film encapsulation member, and having a color filter disposed at a location corresponding to the organic light emitting member
Data Source
AI summary
An organic light emitting diode (OLED) display includes a substrate, a pixel electrode on the substrate, an organic light emitting member on the pixel electrode, a common electrode on the organic light emitting member, a thin film encapsulation member covering the common electrode, a black matrix on the thin film encapsulation member, and an upper protection film on the black matrix. The black matrix has a color filter at a location corresponding to the organic light emitting member. A sum of a thickness of the color filter and a distance between the color filter and the organic light emitting member is smaller than a width of the organic light emitting member.