Flexible Substrate Chromaticity Compensation for Yellowish Light
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Solution Overview
Problem
Conventional display devices using polyimide (PI) flexible substrates undergo high-temperature processing, leading to yellowish light emission, which is not effectively addressed by existing technologies.
Innovation Solution
A display device comprising a first and second flexible substrate with distinct light transmission chromaticity coordinates, where the difference in chromaticity between the two substrates is adjusted through variations in thickness, element doping, polymer concentration, and processing temperatures to compensate for the yellowish hue, ensuring x1−x2≥0.002 or y1−y2≥0.002, thereby improving light color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high-temperature processing is used for polyimide flexible substrate, then the substrate has high temperature resistance, but the light emitted from the display panel becomes more yellowish
Solution Approach 1:
The patent applies parameter changes by introducing a chromaticity compensation layer with specific optical properties (different from the substrate's chromaticity coordinates by at least 0.002) to counteract the yellowish hue caused by high-temperature processing of polyimide substrates
Solution Approach 2:
The patent uses composite materials by combining the polyimide flexible substrate with additional functional layers (chromaticity compensation layer, color filter layer, etc.) that have different optical characteristics to achieve both high temperature resistance and neutral color output
2Object-affected harmful factors
If chromaticity compensation is implemented using substrates with different chromaticity coordinates, then the yellowish light emission is compensated, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by introducing chromaticity compensation only in specific regions or layers where it is most needed, rather than changing the entire substrate structure. The compensation layer is strategically positioned to address the yellowish hue while maintaining overall device simplicity
Solution Approach 2:
The patent uses an intermediary chromaticity compensation layer that mediates between the high-temperature processed substrate and the final light output. This intermediate layer with different chromaticity coordinates (x1, y1) and (x2, y2) where x1-x2≥0.002 or y1-y2≥0.002 compensates for the substrate's yellowish characteristics without requiring fundamental structural changes
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 chromaticity difference between the substrates compensates for the yellowish light emission, resulting in a more accurate and appealing color output, enhancing the display device's performance by adjusting the light transmission characteristics.
Implementation Method 1
The first flexible substrate has a first light transmission chromaticity coordinates (x1, y1), and the second flexible substrate has a second light transmission chromaticity coordinates (x2, y2), wherein x1−x2≥0.002 or y1−y2≥0.002. The chromaticity difference between the substrates compensates for the yellowish light emission
Data Source
AI summary
An electronic device is provided. The electronic device includes a first layer, a second layer, a circuit layer, and a display medium layer. The second layer is disposed opposite to the first layer. The circuit layer is formed on the first layer. The display medium layer is disposed between the first layer and the second layer. The first layer has a first light transmission chromaticity coordinates (x1, y1) on the CIE 1931 xy chromaticity coordinates, the second layer has a second light transmission chromaticity coordinates (x2, y2) on the CIE 1931 xy chromaticity coordinates, and x1≥x2 or y1≥y2.