OLED Display Black Matrix Structure for Reflection Control
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Solution Overview
Problem
Organic light-emitting diode (OLED) display devices with polarizers suffer from reduced luminance, leading to increased power consumption to compensate, which is undesirable in terms of manufacturing cost and energy efficiency.
Innovation Solution
A display device design that eliminates the polarizer by using a substrate with multiple sub-pixels, each comprising a light-emitting element, encapsulation layer, touch electrode, color filters, and a black matrix structure, which includes a first and second black matrix to manage light reflection without the need for a polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is used to reduce external light reflection, then reflection is reduced, but luminance is lowered and power consumption increases
Solution Approach 1:
The patent removes the polarizer from the display device structure entirely. Instead of using a polarizer to reduce reflection, the invention uses a black matrix with specific refractive index properties and optical cavity structures to achieve both reflection reduction and maintain luminance without the harmful effects of polarizers
Solution Approach 2:
The patent changes the optical parameters by using a black matrix with specifically controlled refractive index (different from both the encapsulation layer and color filter layers) and controlling the thickness of various layers to create optical cavities. This parameter optimization allows the system to reduce reflection while maintaining high luminance without requiring a polarizer
2Object-affected harmful factors
If a polarizer is used to reduce external light reflection, then reflection is reduced, but power consumption increases
Solution Approach 1:
The patent removes the polarizer from the display device structure entirely. Instead of using a polarizer to reduce reflection, the invention uses a black matrix with specific refractive index properties and optical cavity structures to achieve both reflection reduction and maintain luminance without the harmful effects of polarizers
Solution Approach 2:
The patent converts the potentially harmful effect of light reflection into a beneficial optical cavity structure. By carefully designing the thickness and refractive indices of layers, the reflection that would normally be harmful is transformed into constructive interference that enhances luminance, thereby reducing power consumption requirements
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 design enhances luminance while reducing power consumption and manufacturing costs by minimizing light reflection and eliminating the polarizer's luminance degradation, resulting in a more efficient and cost-effective OLED display.
Implementation Method 1
a first color filter and a second color filter, wherein the first color filter and the second color filter are adjacent to each other, and a black matrix between the first color filter and the second color filter. The black matrix includes a first black matrix and a second black matrix disposed on and covering a side surface of the first black matrix
Data Source
AI summary
A display device includes a plurality of pixels disposed on a substrate, wherein each of the plurality of pixels is composed of a plurality of sub-pixels; a transistor disposed in each of the plurality of sub-pixels; a light-emitting element disposed in each of the plurality of sub-pixels, wherein the light-emitting element includes a light-emitting layer; an encapsulation layer covering the light-emitting layer; a touch electrode disposed on the encapsulation layer; multiple color filters, each corresponding to one of the plurality of sub-pixels, and a black matrix disposed between a first color filter and a second color filter, wherein the black matrix includes a first black matrix, and a second black matrix disposed on and covering a side surface of the first black matrix.