Display Device Light Absorbing Layer Opening Design
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Solution Overview
Problem
Existing display devices face challenges in maintaining light-emitting angles and ambient contrast ratios due to the absorption of ambient light by light absorbing layers, which affects the brightness and contrast of organic light-emitting diode displays, especially under strong ambient conditions.
Innovation Solution
A display device design featuring a first substrate with a display element layer, a second substrate with a gray film and a light absorbing layer, where the orthogonal projection area of the gray film overlaps the opening of the light absorbing layer, ensuring that the light-emitting region is not obstructed, and the area of the opening is less than half the area of the pixel structure, allowing efficient blocking of ambient light while maintaining the light-emitting angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light absorbing layer is disposed onto the opposite substrate for absorbing ambient light, then the reflection of ambient light is controlled, but a portion of light emitted from the light-emitting layer is blocked, influencing the light-emitting angle
Solution Approach 1:
The light absorbing layer is segmented by providing openings (transparent regions) within it, dividing the layer into light-absorbing portions and light-transmitting portions. This segmentation allows different regions to perform different functions: blocking ambient light while transmitting emitted light, thereby resolving the contradiction between controlling ambient light reflection and maintaining light-emitting angle.
Solution Approach 2:
Different regions of the light absorbing layer are given different optical properties. The regions with openings have high transparency to emitted light, while the regions without openings have high light-absorbing capability. This local differentiation allows the layer to simultaneously control ambient light reflection and maintain the light-emitting angle of the display device.
2Object-affected harmful factors
If a light absorbing layer is disposed onto the opposite substrate for absorbing ambient light, then the reflection of ambient light is controlled, but the emitting brightness of the light-emitting layer is reduced
Solution Approach 1:
The light absorbing layer is divided into light-absorbing regions and light-transmitting regions (openings). The openings allow emitted light to pass through without absorption, preserving the brightness of the display, while the light-absorbing regions block ambient light. This segmentation resolves the contradiction between controlling ambient light reflection and maintaining emitting brightness.
Solution Approach 2:
The light absorbing layer with openings acts as an intermediary structure that selectively interacts with different light sources. It mediates between ambient light (which should be blocked) and emitted light (which should pass through), allowing the display to maintain brightness while controlling ambient light reflection.
3Object-affected harmful factors
If the orthogonal projection area of the light absorbing layer overlaps the light-emitting layer, then ambient light reflection is controlled, but the light-emitting angle cannot be maintained
Solution Approach 1:
The overlapping light absorbing layer is segmented by providing openings, creating regions that absorb light and regions that transmit light. This segmentation allows the layer to control ambient light reflection in the overlapping areas while maintaining light-emitting angle through the opening regions, resolving the contradiction.
Solution Approach 2:
The light absorbing layer exhibits different optical qualities in different locations: high absorption in regions without openings and high transmission in regions with openings. This local quality differentiation enables the layer to simultaneously control ambient light reflection and maintain the light-emitting angle despite overlapping with the light-emitting layer.
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 effectively controls ambient light reflection and maintains the light-emitting angle of the display device, enhancing the ambient contrast ratio and brightness, thereby improving display quality under varying light conditions.
Implementation Method 1
a light absorbing layer may be additionally disposed onto the opposite substrate for absorbing the ambient light
Implementation Method 2
the pixel structure includes a light-emitting layer and has a light-emitting region
Data Source
AI summary
According to an embodiment of the present disclosure, a display device including a first substrate, a display element layer, a second substrate opposite to the first substrate, a gray film disposed on the second substrate, and a light absorbing layer disposed on the second substrate is provided. The display element layer disposed on the first substrate includes at least one pixel structure including a light-emitting layer and having a light-emitting region. An orthogonal projection area of the gray film on the second substrate overlaps an orthogonal projection area of the opening of the light absorbing layer on the second substrate. An area of the pixel structure is P, an area of the light-emitting region is W. An area of the opening is AR. W<AR≤0.5P. An orthogonal projection area of the light-emitting region on the second substrate is located in an orthogonal projection area of the opening on the second substrate.