OLED Color Filter Blocking Wall for View Angle Color Shift
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Solution Overview
Problem
Conventional OLED display panels face issues with inconsistent view angle light emission ratios and large view angle color shift due to the use of traditional black matrix materials, which cause uneven light emission and reddish picture color at wide angles.
Innovation Solution
The OLED display panel employs a sandwich-structured blocking wall composed of color filter films of different colors, where the middle layer is thicker than the upper and lower layers, effectively blocking stray light and improving color purity by reducing the step between color filter films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional black matrix materials are used, then light-shielding function is achieved, but view angle color shift increases and light emission consistency deteriorates
Solution Approach 1:
The blocking wall is segmented into multiple layers (first blocking wall layer, second blocking wall layer, third blocking wall layer) with alternating colors. This segmentation allows each layer to selectively block specific wavelengths of stray light while transmitting others, thereby reducing overall view angle color shift and improving light emission consistency across different viewing angles.
Solution Approach 2:
Different layers of the blocking wall have different local optical properties (different colors). The first blocking wall layer has a first color, the second has a second color, and the third has a third color, creating local quality variations that enable selective light blocking at different wavelengths, thus improving color consistency without compromising stray light blocking.
2Manufacturing precision
If black matrix is used to block stray light, then color purity improves, but preparation process complexity increases
Solution Approach 1:
The blocking wall structure is merged with the color filter layer, eliminating the need for a separate black matrix layer. The alternating colored blocking wall layers perform both the light-shielding function of a black matrix and the color-filtering function, thereby maintaining color purity while simplifying the overall preparation process by reducing the number of separate components and steps.
Solution Approach 2:
The blocking wall structure serves multiple functions simultaneously: it blocks stray light (original black matrix function), filters colors (color filter function), and improves view angle consistency. This multi-functionality eliminates the need for separate black matrix and color filter layers, reducing preparation process complexity while maintaining or improving color purity.
3Area of stationary object
If color filter films are placed adjacent to each other, then display area increases, but stray light between sub-pixels increases
Solution Approach 1:
The blocking wall is segmented into multiple alternating colored layers positioned between adjacent color filter films. This segmentation creates intermediate light-blocking structures that prevent stray light from one sub-pixel from entering adjacent sub-pixels, thereby maintaining high display area while effectively reducing inter-sub-pixel stray light.
Solution Approach 2:
The blocking wall acts as an intermediary structure between adjacent color filter films. The alternating colored layers of the blocking wall mediate the light interaction between neighboring sub-pixels, blocking stray light paths while allowing direct light transmission, thus enabling close placement of color filter films without significant stray light interference.
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 solution enhances the consistency of view angle light emission ratios of RGB colors, mitigates the reddish picture color issue, and reduces view angle color shift, resulting in improved display performance.
Implementation Method 1
Color filters are optical filters presenting colors that can accurately select a small range waveband of light waves to pass through, and reflect other undesirable light waves
Implementation Method 2
The color filter films of at least two different colors are alternately arranged in the light filter layer, and a blocking wall with a sandwich structure is provided between two adjacent color filter films of different colors
Data Source
AI summary
An OLED display panel, a preparation method thereof and a display device are provided. The OLED display panel includes a light-emitting layer and a light filter layer. The light filter layer includes a color filter film. The color filter film includes at least two of a red filter film, a green filter film and a blue filter film. At least two color filter films of different colors are alternately arranged in the light filter layer.