Electrochromic Color Filter for Liquid Crystal Display Brightness Saturation Trade-off
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Solution Overview
Problem
Existing liquid crystal displays face challenges in simultaneously achieving high color saturation and high brightness due to limitations in color filter technology, which often result in decreased display brightness when trying to enhance color saturation.
Innovation Solution
A color filter design incorporating electrochromic materials in sub-pixel areas, with transparent electrodes allowing voltage control to switch between high color saturation and high brightness modes, utilizing n-type or p-type metal oxides and conducting polymers, and a manufacturing process involving vacuum sputter deposition or chemical polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color saturation is enhanced by using traditional color resist layers, then color expression capability is improved, but display brightness is decreased
Solution Approach 1:
The patent applies electrochromic materials that can dynamically change their optical properties (color and transparency) in response to voltage changes. This allows the color filter to adapt between high color saturation mode (when electrochromic material is in colored state) and high brightness mode (when electrochromic material is in transparent state), resolving the contradiction between fixed color saturation and fixed brightness
Solution Approach 2:
The patent changes the physical and chemical state of the electrochromic material by applying voltage, which alters its optical transmission properties. By controlling the valence state and chemical composition of the electrochromic material through electrical excitation, the system achieves reversible switching between colored and transparent states, enabling dynamic adjustment of both color saturation and brightness
2Illumination intensity
If white matrix or yellow matrix is added to achieve high brightness, then display brightness is improved, but color saturation is decreased
Solution Approach 1:
Instead of using static white or yellow matrices that permanently reduce color saturation, the patent employs dynamic electrochromic materials that can switch between transparent and colored states. This allows the system to achieve high brightness when needed while maintaining high color saturation when required, eliminating the need for compromising color saturation with fixed brightening elements
Solution Approach 2:
The patent uses electrochromic materials whose optical properties can be changed by applying voltage. The material transitions between transparent state (for high brightness) and colored state (for high color saturation) based on electrical control, providing dynamic adjustment rather than fixed compromise
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 enables liquid crystal panels to achieve high color saturation and high brightness simultaneously, while also providing high contrast, wide view angles, and rich colors by controlling visible light transmission and color expression through voltage adjustments.
Implementation Method 1
The electrochromism means that the material occurs stable and reversible phenomenon in an electric field. When the material occurs the injection and extraction of the electrons and ions under the action of electrochemistry, the valence state and the chemical composition will be changed. Thus, the reflection and transmission capabilities of the material are changed.
Data Source
AI summary
The present invention provides a color filter and a liquid crystal display. The color filter comprises a substrate, and a color resist layer and a black matrix positioned on the substrate, and the color resist layer comprises a plurality of pixel areas aligned in array, and the plurality of pixel areas are separated by the black matrix, and the pixel area comprises a sub pixel main area and a sub pixel sub area, and two sides of the sub pixel sub area are respectively provided with a first transparent electrode and a second transparent electrode electrically coupled thereto; the sub pixel sub area is made by electrochromic material, and by adjusting voltage signals applied to the two sides of the sub pixel sub area with the first transparent electrode and the second transparent electrode, color variation of the sub pixel sub area is controlled to achieve switch of the color filter between high color saturation and high brightness display modes. The liquid crystal panel of the present invention is provided with the color filter capable of achieving switch of the color filter between high color saturation and high brightness display modes to satisfy the display requirement of high color saturation and high brightness at the same time.