Display Panel Refraction Layer for Ambient Light Control
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Solution Overview
Problem
OLED display panels experience color mixing, glare, and other issues due to the reflection of ambient light when in a black state, particularly with strong ambient light.
Innovation Solution
A display panel design that includes a refraction layer positioned below the color filter layer, which refracts ambient light entering from the outside or reflected by the light-emitting element back to the black matrix, thereby reducing the influence of external ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is attached to the light-emitting surface to reduce external light reflectivity, then the reflectivity is reduced, but the light-emitting effect is reduced due to large light loss
Solution Approach 1:
The patent extracts the light-blocking function from the light-emitting path by introducing a light-shielding layer in the pixel defining layer. This layer selectively blocks ambient light from reaching the anode while allowing emitted light to pass through, separating the functions of light emission and ambient light rejection.
Solution Approach 2:
The patent introduces an intermediary light-shielding layer between the ambient light and the anode. This intermediary structure absorbs or blocks ambient light before it can cause reflection and color mixing, while being transparent to the emitted light from the light-emitting element.
2Illumination intensity
If ambient light enters the display panel and reaches the anode, then the display panel can be seen in bright environments, but color mixing and glare occur when in black state
Solution Approach 1:
The patent applies local quality by creating a light-shielding layer with specific optical properties only in the pixel defining layer areas where ambient light would cause problems. The layer has different optical characteristics for different regions: blocking ambient light in non-opening areas while maintaining transparency in opening areas for light emission.
Solution Approach 2:
The patent converts the harmful effect of ambient light into a beneficial one by using the light-shielding layer to selectively block only the problematic ambient light that causes color mixing and glare, while allowing the useful emitted light to pass through uninterrupted.
3Productivity
If a color filter is disposed on the light-emitting surface to improve light-emitting efficiency, then light-emitting efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The patent merges the light-shielding function with the existing pixel defining layer structure. Instead of adding a separate complex light-shielding component, the light-shielding layer is integrated into the pixel defining layer, combining multiple functions into a single structural element.
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 refraction layer effectively prevents color mixing and glare by refracting most ambient light at large angles onto the black matrix, improving the display effect in black states or low grayscale, making the black state darker and enhancing display quality.
Implementation Method 1
The refraction layer is arranged on the encapsulation layer and is used to refract the light entering the refraction layer
Data Source
AI summary
A display panel and a display device are disclosed. The display panel includes a substrate, a light-emitting element layer, a pixel defining layer, an encapsulation layer, a refraction layer, and a color filter layer. The refraction layer is arranged on the encapsulation layer to refract light entering the refraction layer. The color filter layer is arranged on the refraction layer, and includes a black matrix disposed in a non-opening area and multiple color filters disposed in a non-opening area. Every two adjacent color filters are separated by the black matrix. The refraction layer includes multiple refraction portions. Each refraction portion is arranged under the black matrix, is located in the non-opening area, and extends toward the opening area. The refraction portions are each used to refract the external ambient light and receive the reflected light reflected by the light-emitting element and refract the reflected light to the black matrix.