Color Filter Substrate with Carbon and Organic Pigment Light-Shielding Layers
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Solution Overview
Problem
Liquid crystal display devices face challenges in reducing thickness and weight while maintaining display quality, particularly in on-cell methods where touch panels add thickness and weight, and in-cell methods struggle with accurate color separation of visible light and noise compensation from light sensors.
Innovation Solution
A liquid crystal display device incorporating a color filter substrate with a carbon light-shielding layer and an organic pigment light-shielding layer, where the organic pigment layer overlaps with color filters and is closer to the liquid crystal layer to reduce light leakage and enhance light-shielding properties, along with a method for producing this substrate involving infrared light alignment and exposure processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch panels are provided on liquid crystal display surfaces (on-cell method), then touch sensing function is achieved, but thickness and weight of the device increase
Solution Approach 1:
The patent merges the touch sensing function with the color filter substrate by integrating light sensors directly into the color filter substrate structure. This combination eliminates the need for separate touch panels, thereby achieving touch sensing capability while avoiding additional thickness and weight that would result from adding discrete touch panel layers.
Solution Approach 2:
The color filter substrate is designed to serve multiple functions simultaneously: it acts as both the color filtering layer for display and the sensing layer for touch detection. By incorporating light sensors into the color filter substrate, the substrate becomes a multi-functional component that performs both display and touch sensing operations, thereby eliminating the need for separate dedicated touch sensing components.
2Ease of operation
If touch panels are provided on liquid crystal display surfaces (on-cell method), then touch sensing function is achieved, but display quality decreases due to light reflection
Solution Approach 1:
The patent merges the touch sensing function with the color filter substrate by integrating light sensors directly into the color filter substrate structure. This combination eliminates the need for separate touch panels, thereby achieving touch sensing capability while avoiding additional thickness and weight that would result from adding discrete touch panel layers.
Solution Approach 2:
The patent converts the potentially harmful effect of light absorption by integrating light sensors that detect touched positions through the color filter substrate. By positioning the light sensors on the color filter substrate rather than adding separate touch panels, the system utilizes the substrate's optical properties beneficially for sensing while avoiding the harmful light reflection that would occur with additional panel layers.
3Ease of operation
If light sensors are used for touch sensing, then touch detection is achieved, but noise is introduced due to dark current from temperature changes
Solution Approach 1:
The patent implements a feedback mechanism where a control unit receives detection results from the light sensors and performs noise correction. The control unit compensates for dark current noise generated by temperature changes by processing the detection signals, thereby maintaining accurate touch detection despite the presence of thermal noise from the light sensors.
4Object-affected harmful factors
If organic pigment light-shielding layer overlaps with color filters, then light-shielding properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the light-shielding function with the color filter structure by forming the organic pigment light-shielding layer to overlap with the color filters on the same substrate. This integration achieves effective light shielding to prevent light leakage while avoiding the need for separate additional light-shielding layers, thereby maintaining relatively simple manufacturing processes.
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 effectively reduces the thickness and weight of liquid crystal display devices while achieving accurate color separation and touch sensing by stabilizing detection results and improving light-shielding properties, thereby enhancing display quality and user interaction.
Implementation Method 1
an organic pigment light-shielding layer overlapping with at least one of the color filters in a direction perpendicular to a substrate plane
Implementation Method 2
A liquid crystal display device incorporating a color filter substrate with a carbon light-shielding layer and an organic pigment light-shielding layer
Implementation Method 3
a method for producing this substrate involving infrared light alignment and exposure processes
Data Source
AI summary
A liquid crystal display device includes an array substrate, a liquid crystal layer, and a color filter substrate facing the array substrate through the liquid crystal layer. The color filter substrate includes a carbon light-shielding layer, an organic pigment light-shielding layer, and color filters formed such that the organic pigment light-shielding layer overlaps with at least one of the color filters in a direction perpendicular to a substrate plane. The array substrate includes a first light sensor that detects light which passes through any of the color filters without passing through the organic pigment light-shielding layer in the direction perpendicular to the substrate plane. The array substrate further includes a second light sensor that detects light which passes through the organic pigment light-shielding layer and any of the color filters in the direction perpendicular to the substrate plane.