Electrochromic Color Filter Substrate for LCD Brightness and Saturation
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Solution Overview
Problem
Current color filter substrates in liquid crystal displays (LCDs) face challenges in simultaneously achieving high brightness and high color saturation, as increasing brightness typically compromises color saturation.
Innovation Solution
Incorporating an electrochromic material as a color change filter, which can switch between transparency and a specific color (like cyan) when voltage is applied, allowing for easy switching between high brightness and high color saturation modes by using a matrix of red, green, blue, and color change filters with transparent electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white (W) matrix is added to obtain the RGBW display matrix, then brightness is improved, but color saturation is weakened
Solution Approach 1:
The display matrix is segmented into four types of sub-pixels: red (R), green (G), blue (B), and color change (C), instead of using traditional white (W) sub-pixels. The color change sub-pixel is further segmented into electrochromic material regions that can switch between different color states, allowing independent control of brightness and color saturation functions.
Solution Approach 2:
The color change filter incorporates electrochromic material that can dynamically change its optical properties (color and transparency) in response to applied voltage. This dynamic switching capability allows the same pixel to serve different functions: displaying color information when voltage is applied, and providing brightness enhancement when no voltage is applied, thus resolving the static trade-off between brightness and color saturation.
2Manufacturing precision
If color saturation is improved using traditional color filters, then color expression is enhanced, but brightness is reduced
Solution Approach 1:
The patent employs electrochromic material in the color change filter that can reversibly change its color state based on applied voltage. When voltage is applied, the electrochromic material transitions to a colored state to enhance color saturation; when voltage is removed, it transitions to a transparent or less colored state to maximize light transmission and brightness. This active color change capability allows the system to optimize for color saturation only when needed.
Solution Approach 2:
The color change filter serves multiple functions: it acts as a color filter when voltage is applied to enhance color saturation, and acts as a transparent or neutral density filter when no voltage is applied to maximize brightness. This multi-functionality allows a single component to address both color saturation and brightness requirements without requiring separate dedicated components for each function.
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
This solution enables high brightness for outdoor displays while maintaining high color saturation, expanding the color gamut and improving color expression, by controlling the applied voltages to the color change filter.
Implementation Method 1
The electrochromism means the phenomenon that the absorption wavelength if the material generates the reversible change with the function of the external electric field, which actually is an electrochemistry oxidation-reduction reaction.
Data Source
AI summary
The present invention provides a color filter substrate and a liquid crystal display panel. Both comprises a color filter layer (11) having a plurality of red filters, green filters, blue filters (R, G, B) and color change filters (C) aligned in matrix, and a first transparent electrode (41) and a second transparent electrode (42) are respectively positioned at two sides of the color change filter (C), and material of the color change filter (C) is electrochromic material. The color change filter (C) is applied with voltage signals via the first transparent electrode (41) and the second transparent electrode (42) to control color change of the color change filter (C) for conveniently achieving high brightness and high color saturation display; as appearing to be transparent, the transmission is high to satisfy the demand of high brightness display; as the color change filter (C) appears to be a specific color which is not red, green, blue, such as cyan, four colors display can be realized to promote the color expression ability to satisfy the demand of high color saturation display.