Transflective LCD Color Filter Thickness Variation
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Solution Overview
Problem
Current transflective liquid crystal display devices with a color filter on array (COA) structure face issues of liquid crystal misalignment and driving errors due to differences in light paths through the color filter layer between transmissive and reflective areas, leading to inconsistencies in color reproduction.
Innovation Solution
A liquid crystal display device is designed with a first substrate featuring a thin film transistor, an organic film with a depressed portion, a reflective film, a black matrix, and a color filter layer that is thicker in the depressed portion than in the rest of the pixel region, along with a pixel electrode, to align light paths and improve color reproductivity, while reducing misalignment and driving errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light hole is formed on the color filter layer in the reflective area to match colors, then color reproductivity is improved, but a stepped portion forms causing liquid crystal misalignment and driving errors
Solution Approach 1:
The patent applies local quality by making the color filter layer thickness non-uniform: thicker in the reflective area and thinner in the transmissive area. This localized thickness variation compensates for the longer light path in reflective areas, equalizing the effective light path length through the color filter layer across both areas, thereby improving color reproductivity without creating stepped portions that would misalign liquid crystal molecules.
Solution Approach 2:
The patent changes the physical parameter of the color filter layer thickness to resolve the contradiction. By adjusting the thickness parameter locally (thicker in reflective area, thinner in transmissive area), the patent equalizes the optical path length without requiring light holes, thus avoiding liquid crystal misalignment while achieving consistent color reproduction across different display areas.
2Ease of manufacture
If the color filter layer has uniform thickness, then manufacturing is simplified, but light path length differences cause color inconsistency between transmissive and reflective areas
Solution Approach 1:
The patent implements local quality by varying the color filter layer thickness according to functional area: the reflective area receives a thicker color filter layer while the transmissive area receives a thinner layer. This localized differentiation maintains manufacturing feasibility while achieving consistent color output by compensating for the longer light path in reflective areas.
Solution Approach 2:
The patent modifies the thickness parameter of the color filter layer to resolve the contradiction between manufacturing simplicity and color consistency. By controlling the thickness parameter to be non-uniform (thicker in reflective area, thinner in transmissive area), the patent achieves equalized light path lengths and consistent color reproduction without significantly complicating the manufacturing process.
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 liquid crystal misalignment and driving errors, enhancing color reproductivity by equalizing light paths through the color filter layer in both transmissive and reflective areas, thereby improving the overall performance of the liquid crystal display device.
Implementation Method 1
The light radiated from the backlight unit changes its light transmissivity with arrangement of the liquid crystal layer
Implementation Method 2
light incident on the LCD panel can be used by being reflected off a reflective film in a reflective area
Data Source
AI summary
A liquid crystal display device that reduces the likelihood of liquid crystal misalignment and driving errors is presented. The liquid crystal display device also improves color reproductively. The device includes a first substrate, and second substrate, and a liquid crystal layer placed between the first substrate and the second substrate. The first substrate includes a gate line and a data line that define a pixel region, a thin film transistor provided at an intersection area of the gate line and the data line, an organic film formed on the thin film transistor and having a depressed portion, a reflective film formed on the organic film, a black matrix, a color filter layer formed in the pixel region, and a pixel electrode formed on the color filter layer. The color filter layer has a different thickness in the depressed portion than in the rest of the pixel region.