TFT Array Panel with Segmented Reflective Electrodes for Gamma Curve Coincidence
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Solution Overview
Problem
Transmissive-reflective LCDs face challenges in achieving coincident gamma curves for reflective and transmissive modes due to differences in cell gap and driving voltages, leading to image display inconsistencies and manufacturing complexities.
Innovation Solution
A TFT array panel design with a transmissive electrode and two reflective electrodes, where the second reflective electrode is separated and connected to an auxiliary electrode, allowing for different voltages between the reflective LC capacitances to achieve a uniform cell gap and coincident gamma curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thicker layer is formed on the reflective region to achieve different cell gaps, then gamma curves can be adjusted, but the manufacturing process becomes complicated and high steps cause disclination and brightness reversion
Solution Approach 1:
The reflective electrode is divided into two separate electrodes (first reflective electrode and second reflective electrode) that can be independently controlled. This segmentation allows different voltages to be applied to different regions, achieving the desired gamma curve coincidence without requiring complex multi-layer structures or high steps that would complicate manufacturing.
Solution Approach 2:
Different regions of the display (transmissive region and reflective region) are provided with different cell gaps through selective electrode configuration. The transmissive region has a first cell gap while the reflective region has a second cell gap, optimized for their respective functions. This local differentiation resolves the contradiction by allowing region-specific optimization without global manufacturing complexity.
2Manufacturing precision
If different cell gaps are formed between transmissive and reflective regions, then gamma curves can be adjusted, but high steps cause disclination in images and brightness reversion
Solution Approach 1:
The reflective electrode is segmented into two independent electrodes that can be positioned at different heights and controlled with different voltages. This allows the reflective region to have an optimized cell gap for gamma curve coincidence with the transmissive region, while avoiding high step formation that would cause disclination and brightness reversion in the displayed images.
Solution Approach 2:
The cell gap parameter is differentiated between transmissive and reflective regions through the use of separate reflective electrodes. By controlling the voltage applied to each reflective electrode independently, the system achieves gamma curve coincidence across different viewing modes without creating physical discontinuities that would degrade image quality.
3Adaptability or versatility
If two different driving voltages are applied for transmissive and reflective modes, then gamma curves can be adjusted, but gamma curves cannot be coincident due to inconsistency between critical voltages
Solution Approach 1:
The reflective electrode is divided into two independently controllable electrodes, allowing the system to maintain a single driving voltage while achieving different effective voltages in transmissive and reflective regions. This segmentation enables gamma curve coincidence without requiring inconsistent critical voltages, resolving the contradiction between driving flexibility and gamma precision.
Solution Approach 2:
Different effective driving conditions are achieved locally in transmissive and reflective regions through the use of separate reflective electrodes with independent voltage control. This allows each region to be optimized for its specific function while maintaining overall system compatibility and achieving gamma curve coincidence across both modes.
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 design ensures uniform cell gaps and coincident gamma curves for both reflective and transmissive modes, reducing image display inconsistencies and simplifying the manufacturing process.
Implementation Method 1
applying voltages to the field-generating electrodes to generate an electric field in the LC layer that determines orientations of LC molecules
Implementation Method 2
adjust polarization of incident light
Implementation Method 3
The light source of the reflective LCD is an external light
Data Source
AI summary
The present invention provides a TFT array panel having a transmissive region and a reflective region. A transmissive electrode is disposed in the transmissive region. The first reflective electrode connected to the transmissive electrode is disposed on the reflective region. The second reflective electrode separated from the transmissive electrode and the first reflective region is formed in the reflective region. A first conductor is connected to at least one of the transmissive electrode and the first reflective electrode. A second conductor is connected to the second reflective electrode. At least one of the transmissive electrode, the first reflective electrode and the first conductor overlaps at least one of the second reflective electrode and the second conductor.