Optical Composite Sheet for LCD Color Gamut and Angle Deviation
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from color deviation when viewed from different angles due to limitations in color gamut and optical performance, which hinders their competitiveness against other display technologies like OLEDs and PDPs.
Innovation Solution
An optical composite sheet is developed, comprising a prism sheet, a light diffusion layer, and a light absorbing layer, where the light absorbing layer is strategically positioned between or under the prism and diffusion layers, satisfying a specific relationship in color transmittance measurements across different viewing angles to enhance color gamut and reduce color deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional optical sheets are used in LCD devices, then the device structure is simple and easy to manufacture, but color deviation occurs when viewed from different angles and color gamut is limited
Solution Approach 1:
The patent combines multiple optical functions (light collection, diffusion, reflection, and wavelength filtering) into a single integrated optical composite sheet. This merging of functions resolves the contradiction by achieving complex optical performance (reducing color deviation and enhancing color gamut) while maintaining manufacturing simplicity, as the combined structure is manufactured as one component rather than assembling multiple separate optical elements.
Solution Approach 2:
The optical composite sheet uses composite materials with specific wavelength-dependent optical properties. By incorporating materials that selectively transmit and absorb different wavelengths (RGB wavelengths versus other wavelengths), the patent achieves precise color control and reduced color deviation while maintaining the sheet's manufacturability as a single integrated component.
2Ease of manufacture
If conventional optical sheets are used in LCD devices, then the device structure is simple, but color gamut is limited compared to OLED and PDP devices
Solution Approach 1:
The patent applies local quality by designing the optical composite sheet with spatially varying optical properties. Different regions or layers of the sheet are optimized for specific wavelength ranges (RGB wavelengths), allowing the sheet to enhance color gamut in the visible spectrum while maintaining ease of manufacture as a single integrated component rather than requiring multiple separate filters.
Solution Approach 2:
The patent utilizes parameter changes by controlling the optical transmission characteristics at different wavelengths. By adjusting the optical properties (transmission vs. absorption) for specific wavelength ranges through material selection and layer design, the patent expands color gamut while maintaining manufacturing simplicity through a single integrated sheet structure.
3Reliability
If multiple optical functions are combined in separate components, then each function can be optimized independently, but device complexity increases
Solution Approach 1:
The patent merges multiple optical functions (light collection, diffusion, reflection, and wavelength filtering) into a single optical composite sheet. This consolidation reduces device complexity by eliminating the need for multiple separate optical components while maintaining reliable optical performance, as each function is integrated into the single sheet structure that works together to enhance color gamut and reduce color deviation.
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 optical composite sheet effectively enhances the color gamut and reduces color deviation when viewed from various angles, improving the optical performance of LCD devices and making them more competitive in the market.
Implementation Method 1
a light absorbing layer disposed on the prism sheet, between the prism sheet and the light diffusion layer, or under the light diffusion layer
Implementation Method 2
a prism sheet
Implementation Method 3
a light diffusion layer disposed under the prism sheet
Data Source
AI summary
An optical composite sheet is disclosed. In the optical composite sheet, optical functional elements such as a prism sheet and a light diffusion layer are combined, and a light absorbing layer that selectively absorbs light of a specific wavelength band is inserted, so that the optical performance and color gamut can be enhanced as compared with the prior art. In particular, the color transmittance of the optical composite sheet with respect to wavelength measured for each viewing angle satisfies a specific relationship, whereby it is possible to effectively reduce the color deviation with respect to the viewing angle.