Transparent Resin Layer Thickness Control for Display Color Shift
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Solution Overview
Problem
In top emission type organic light emitting displays, color shift and luminance unevenness occur due to thickness variations in the transparent resin layer between the organic light emitting devices and the color filter, leading to poor color reproduction and visual quality, especially at wider viewing angles.
Innovation Solution
A transparent resin layer with a thickness L1, calculated using the formula L1 ≤ {(LPITCH - LCF) + (LCF - LEL) / 2} + HKtan(sin^-1(1/n)), is sandwiched between the driving and sealing panels to inhibit color leak and light shielding variations, ensuring uniform light distribution and reduced color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the transparent resin layer is set equal to or less than the distance between pixels of the organic light emitting devices, then color leak from adjacent color filters is reduced, but thickness variation causes luminance unevenness at wider viewing angles
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the transparent resin layer within a specific range (0.5-5 μm) to optimize both color shift prevention and luminance uniformity. By adjusting this critical parameter, the invention resolves the contradiction between reducing color leak and preventing luminance unevenness at wide viewing angles.
2Object-affected harmful factors
If a transparent resin layer is provided between the organic light emitting devices and the color filter, then color leak is reduced, but thickness variation causes variation in light shielding amount
Solution Approach 1:
The patent controls the thickness parameter of the transparent resin layer within 0.5-5 μm to prevent both color leak and luminance uniformity issues. This precise parameter control ensures that the resin layer is thin enough to minimize light path variation but thick enough to maintain structural integrity and prevent color mixing between adjacent pixels.
3Ease of manufacture
If the transparent resin layer thickness varies between thinnest and thickest portions, then manufacturing is simplified, but light shielding variation is visually observed as luminance unevenness
Solution Approach 1:
The patent specifies a narrow thickness range (0.5-5 μm) for the transparent resin layer to minimize luminance unevenness while maintaining ease of manufacture. This parameter control ensures that even with normal manufacturing variations, the thickness remains within a range that prevents visually observable luminance differences at wide viewing angles.
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 specified thickness of the transparent resin layer effectively reduces color shift and luminance unevenness, enhancing the display's color reproduction range and visual quality at wider viewing angles by minimizing light leakage and uniformizing light shielding, thereby improving the overall image display.
Implementation Method 1
a transparent resin layer which is sandwiched between the sealing panel and the driving panel and has a thickness L1 satisfying Inequality (1)
Data Source
AI summary
A display unit in which viewing angle characteristics such as color shift and luminance unevenness depending on the viewing angle are improved and a manufacturing method thereof are provided. A display unit includes a driving panel having a plurality of light emitting devices arranged in a grid on a device substrate, a sealing panel including a sealing substrate, and a transparent resin layer which is sandwiched between the sealing panel and the driving panel. The transparent resin layer has a thickness L1 satisfying Mathematical formula 1L1≤{(LPITCH-LCF)+(LCF-LEL)/2}+HKtan{sin-1(1n)}.