Display Device Color Filter Shift for Diagonal Light
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Solution Overview
Problem
Display devices with organic EL light emitting elements face challenges in efficiently utilizing light emitted diagonally to the normal direction, leading to uneven luminance and chromaticity, which degrades image quality due to the angular distribution of light rays.
Innovation Solution
The display device arranges pixels with color filters and light emitting regions such that the center of each color filter is shifted closer to the light emitting region in an orthogonal projection, with varying lengths and pitches of color filters and light emitting regions to optimize light transmission efficacy, particularly for light emitted diagonally, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the center of each color filter is arranged at the same position as the center of the corresponding light emitting region, then the structure is simple and easy to manufacture, but light emitted in diagonal directions is not efficiently utilized, causing luminance and chromaticity unevenness
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of color filters in different regions of the display. Specifically, color filters in peripheral regions are shifted relative to the light emitting regions to capture diagonally emitted light, while central region filters maintain alignment. This regional differentiation optimizes light utilization for each area's specific viewing angle requirements, improving overall luminance uniformity without compromising manufacturing feasibility.
Solution Approach 2:
The patent introduces asymmetry in the color filter arrangement by deliberately offsetting the center position of color filters from the center position of light emitting regions in certain areas. This asymmetric arrangement, where the shift amount varies by region, enables more effective capture of diagonally emitted light rays, thereby improving luminance and chromaticity uniformity across the display surface.
2Illumination intensity
If color filters are arranged to capture diagonally emitted light, then luminance and chromaticity uniformity is improved, but the structure becomes more complex
Solution Approach 1:
The patent reduces overall device complexity by applying the complex shifted arrangement only to peripheral regions where diagonal light emission is most problematic, while maintaining simple centered alignment in central regions. This localized approach achieves luminance uniformity improvement with minimal additional structural complexity.
Solution Approach 2:
The patent applies the shifted color filter arrangement partially, only to specific peripheral regions rather than uniformly across the entire display. This partial application achieves the necessary light capture improvement without fully implementing the complex structure, thereby balancing performance enhancement with manufacturing simplicity.
3Measurement precision
If the display device uses white light emission with color filters, then color precision is improved, but light efficiency decreases due to angular distribution of emitted light
Solution Approach 1:
The patent optimizes light efficiency by implementing region-specific color filter arrangements that match the angular distribution characteristics of light emission in different areas. Peripheral region filters are shifted to capture diagonally emitted light, while central region filters remain centered. This localized optimization ensures efficient light utilization across all regions while maintaining the white light emission with color filter approach for color precision.
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 arrangement enhances the luminous efficacy of light transmitted through the color filters, reducing the attenuation of diagonally emitted light and minimizing luminance and chromaticity unevenness, resulting in improved image quality by more efficiently using the light emitted diagonally.
Implementation Method 1
each of the plurality of pixels includes a light emitting region and a color filter arranged over the light emitting region
Data Source
AI summary
A display device is provided that has pixels including a first pixel and a second pixel arranged to be adjacent to each other along a first direction. The pixels include a light emitting region and a color filter. Luminous efficacy of the first pixel is higher than that of the second pixel. In a plane view, a center position of each color filter is shifted in the first direction from a center position of a corresponding light emitting region, and a length parallel to the first direction of the color filter of the first pixel is longer than that of the second pixel. In the first direction, each first pixel is periodically arranged and a pitch of the color filter of each first pixel and a pitch of the light emitting region of each first pixel are different from each other.