LCD Cell Gap Adjustment Layer for Color Balance
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Solution Overview
Problem
Liquid crystal display (LCD) devices in plane-to-line switching mode face challenges in maintaining color balance due to a yellowish phenomenon caused by the color capture compensation process, which requires adjusting the thickness of color filters, potentially altering their characteristics and necessitating new materials.
Innovation Solution
The introduction of a cell gap adjustment layer with varying thicknesses within pixel regions allows for the adjustment of chromaticity coordinates without altering the characteristics of the color filter, using materials such as metal, organic, or inorganic materials, and can be disposed on either substrate, enabling precise control of cell gaps to maintain color balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of color filters is adjusted to avoid yellowish phenomenon, then color balance is improved, but the characteristics of color filters change requiring new materials
Solution Approach 1:
A cell gap adjustment layer is introduced as an intermediary element between the color filter and the liquid crystal layer. This layer modifies the cell gap thickness to achieve color balance without altering the color filter itself, thus avoiding the need to change color filter characteristics or materials.
Solution Approach 2:
Instead of changing the color filter thickness parameter, the invention adjusts the cell gap parameter by introducing an additional layer with specific thickness. This parameter change approach allows color balance optimization while maintaining the original color filter characteristics.
2Measurement precision
If ACC compensation process is applied to maintain color balance, then color accuracy is improved, but yellowish phenomenon occurs on LCD screen
Solution Approach 1:
The invention converts the harmful yellowish phenomenon into a beneficial color balance adjustment mechanism. By strategically positioning the cell gap adjustment layer, the optical path is modified to compensate for the yellowish tint, transforming it into a useful color correction feature.
Solution Approach 2:
The cell gap adjustment layer serves as an intermediary that mediates between the color filter and the liquid crystal layer, enabling color balance maintenance without the yellowish phenomenon. It acts as an optical mediator that adjusts the overall optical characteristics of the pixel region.
3Manufacturing precision
If cell gap adjustment layer is introduced to correct chromaticity coordinates, then color balance is maintained, but device structure becomes more complex
Solution Approach 1:
The cell gap adjustment layer is merged with the existing color filter and liquid crystal layer structure. By combining multiple functions (color filtering and cell gap adjustment) into a unified structural approach, the overall device complexity is minimized while achieving the desired color balance.
Solution Approach 2:
The invention uses parameter changes (thickness adjustment of the adjustment layer) to achieve chromaticity coordinate correction. This approach provides flexibility in adjusting color balance without requiring complex structural modifications, thereby limiting the increase in device complexity.
Data Source
AI summary
An LCD device includes: a first substrate; a gate line and a data line on the first substrate; at least one TFT connected to the gate and data lines and comprising source and drain electrodes; a pixel electrode connected to the TFT; a second substrate; a liquid crystal layer between the first and second substrates; a common electrode on one of the first and second substrates; a black matrix disposed on one of the first and second substrates and configured to at least partially define a pixel region; a color filter disposed to correspond to the pixel region; and a cell gap adjustment layer disposed on one of the first and second substrates and positioned so as to form different cell gaps within one pixel region.