Display Device Light Excitation Layer Reflective Substrate
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Solution Overview
Problem
Reflective and transflective LCD devices suffer from low light utilization and display quality due to partial light loss when external light, especially weak sunlight, is used, as it passes through the liquid crystal layer and color filter substrate twice.
Innovation Solution
A display device with a color filter substrate, array substrate, and liquid crystal layer, incorporating a reflective layer and a light excitation layer that converts non-red, non-green, and non-blue external light into red, green, and blue light through excitation, enhancing light utilization via secondary reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If external light is used in reflective and transflective LCD devices, then the device can operate without a backlight, but light loss occurs when light passes through the liquid crystal layer and color filter substrate twice, resulting in low light utilization
Solution Approach 1:
A light excitation layer is introduced as an intermediary between the external light source and the color filter substrate. This layer converts non-red, non-green, and non-blue light into tricolor light through photoluminescence, thereby reducing light loss and improving overall light utilization efficiency while maintaining adequate brightness
Solution Approach 2:
The patent changes the spectral parameters of external light by using the light excitation layer to convert broad-spectrum light into specific wavelength bands (red, green, blue). This parameter transformation allows the light to be more efficiently utilized by the color filter substrate and liquid crystal layer, reducing energy loss
2Reliability
If external light passes through the liquid crystal layer and color filter substrate twice, then reflective display is achieved, but light loss increases and display quality decreases
Solution Approach 1:
The light excitation layer performs preliminary conversion of external light into tricolor light before the light enters the liquid crystal layer and color filter substrate. This preliminary action ensures that the light is already in the optimal wavelength range, reducing subsequent light loss and improving display quality
Solution Approach 2:
The light excitation layer acts as an intermediary that transforms external light into a form more suitable for the subsequent optical components. By converting light wavelengths before they pass through the liquid crystal and color filter layers, it reduces the harmful effects of multiple passes and improves overall system efficiency
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 significantly increases light utilization and brightness, and improves color gamut by effectively converting and filtering external light, particularly in low-light conditions, compared to traditional reflective and transflective LCD devices.
Implementation Method 1
the light excitation layer emits stimulated light upon being excited by external light
Implementation Method 2
the reflective layer is capable of reflecting the stimulated light to the color filter layer
Data Source
AI summary
The present invention relates to a display device. The display device comprises a color filter substrate comprising a color filter layer, an array substrate and a liquid crystal layer disposed between the color filter substrate and the array substrate, characterized in that the display device further comprises a reflective layer and a light excitation layer; the reflective layer is disposed on the side away from the liquid crystal layer of the array substrate, the light excitation layer and the color filter substrate are disposed on the same side of the liquid crystal layer; the light excitation layer emits stimulated light upon being excited by external light and the reflective layer is capable of reflecting the stimulated light to the color filter layer. The display device enhances the utilization to the external light and achieves a higher brightness and an improved color gamut.