Transflective LCD Coupling Capacitor for Gray Scale Uniformity
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Solution Overview
Problem
Transflective liquid crystal display panels with a single cell gap structure face challenges in matching reflective and transmitting curves due to differences in effective refractive indices between the reflective and transmitting parts, leading to non-uniform gray scales.
Innovation Solution
A transflective liquid crystal display panel is designed with a coupling capacitor in the reflective part, utilizing organic and inorganic insulation materials to normalize the reflective curve, matching it with the transmitting curve through controlled data voltage, thereby achieving uniform gray scales in the pixel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single cell gap structure is used in transflective liquid crystal display panels, then the fabrication process is simplified, but the reflective and transmitting curves cannot be matched due to differences in effective refractive indices, resulting in non-uniform gray scales
Solution Approach 1:
The patent applies local quality by introducing a coupling capacitor specifically in the reflective part of the pixel region. This local structural modification allows the reflective curve to be normalized and matched with the transmitting curve, achieving uniform gray scales across both reflective and transmitting parts while maintaining the simplicity of a single cell gap structure throughout the entire display panel.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the capacitance value of the coupling capacitor to normalize the reflective curve. By changing the electrical parameter (capacitance) in the reflective region, the effective refractive index difference between reflective and transmitting parts is compensated, enabling curve matching and uniform gray scale display without modifying the overall cell gap structure.
2Manufacturing precision
If dual cell gap structure is used to compensate for phase difference, then uniform luminance property is achieved, but the fabrication process becomes complicated and less efficient
Solution Approach 1:
The patent extracts the phase compensation function from the structural level (dual cell gap) and relocates it to the electrical level (coupling capacitor). By removing the need for dual cell gap structure and implementing compensation through electrical means in the reflective part, the invention achieves uniform luminance while maintaining fabrication simplicity.
Solution Approach 2:
The patent replaces the mechanical/structural approach (dual cell gap structure) with an electrical approach (coupling capacitor). Instead of using physical structural differences to compensate for phase differences, the invention uses electrical capacitance to normalize the reflective curve, achieving the same luminance uniformity with simpler fabrication.
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 matches the reflective and transmitting curves, ensuring uniform gray scales in the pixel region, simplifying the fabrication process and improving efficiency by eliminating the need for dual cell gaps.
Implementation Method 1
a coupling capacitor for matching a reflective curve of the reflective part with a transmitting curve of the transmitting part by normalizing the reflective curve of reflective part according to a data voltage supplied from the drain electrode
Data Source
AI summary
A transflective type liquid crystal display panel and a method of fabricating the same are discussed. The transflective type liquid crystal display panel according to an embodiment comprises a gate line on a substrate; a data line crossing the gate line to define a pixel region comprised of a transmitting part and a reflective part; a thin film transistor adjacent to a crossing of the gate and data lines; a first insulation film on a passivation film covering the thin film transistor; a reflective electrode in the transmitting part of the pixel region, for reflecting incident light; a pixel electrode formed on a second insulation film covering the reflective electrode, and connected to a drain electrode of the thin film transistor via a contact hole; and a coupling capacitor for matching a reflective curve of the reflective part with a transmitting curve of the transmitting part.