Transflective LCD Voltage Controller for Gray-Scale Uniformity
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Solution Overview
Problem
Transflective liquid crystal displays (LCDs) with single and dual cell gap structures face issues such as gray-scale differences and manufacturing defects, leading to deteriorated display quality and production efficiency.
Innovation Solution
A transflective LCD with a single cell gap structure is designed, featuring a voltage controller with a charge dividing electrode and storage line to control pixel voltages, and a color filter layer with varying thickness and penetrating holes to match phase retardation values between transmissive and reflective areas, ensuring uniform gray-scale and improved manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single cell gap structure is used in transflective LCD, then the manufacturing process is simplified, but gray-scale differences occur between reflective and transmissive areas due to phase retardation differences
Solution Approach 1:
The patent applies local quality by introducing a compensation film specifically in the reflective area with different optical compensation values than the transmissive area. This localized differentiation allows the single cell gap structure to maintain uniform gray-scale display across both reflective and transmissive regions by compensating for the phase retardation differences in the specific area where they occur.
2Manufacturing precision
If a dual cell gap structure is used with larger cell gap in transmissive area, then phase retardation differences are compensated, but step differences occur between reflective and transmissive areas causing patterning defects
Solution Approach 1:
The patent changes the optical parameter (phase retardation compensation value) rather than the geometric parameter (cell gap). By using a compensation film with specific optical properties in the reflective area, the patent achieves phase retardation compensation without creating physical step differences, thus avoiding patterning defects while maintaining gray-scale uniformity.
3Use of energy by moving object
If reflective LCD is used without backlight, then power consumption is reduced, but image display is impossible in insufficient ambient light conditions
Solution Approach 1:
The patent implements multi-functionality by creating a transflective LCD that can operate in both reflective mode (using ambient light) and transmissive mode (using backlight). The display device adapts to different environmental conditions automatically, functioning as both a reflective display in bright environments and a transmissive display in low-light conditions, thus achieving both low power consumption and environmental adaptability.
4Adaptability or versatility
If transmissive LCD with backlight is used, then image display is achieved in all lighting conditions, but power consumption increases
Solution Approach 1:
The patent applies dynamics by enabling the display to dynamically switch between reflective and transmissive modes based on ambient light conditions. The display adapts its operating mode in real-time, using the reflective mode (no backlight) in bright environments to save power, and switching to transmissive mode (with backlight) only when necessary in low-light conditions, thus optimizing power consumption while maintaining display capability.
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 gray-scale differences and manufacturing defects, enhancing display quality and simplifying the manufacturing process by maintaining uniform light transmission and reflection across the LCD.
Implementation Method 1
a liquid crystal layer disposed between the first substrate and the second substrate
Implementation Method 2
phase retardation difference therein, thereby causing deterioration of display quality
Implementation Method 3
a voltage controller with a charge dividing electrode and storage line to control pixel voltages
Data Source
AI summary
A liquid crystal display includes a first substrate including pixels, each having a transmissive area and a reflective area, a second substrate, and a liquid crystal layer disposed between the first and second substrates. Each of the pixels includes first and second thin film transistors which output a data signal in response to a first gate signal, a transmissive pixel electrode disposed in the transmissive area and electrically connected to the first thin film transistor to charge a first pixel voltage based on the data signal, a reflective pixel electrode disposed in the reflective area and electrically connected to the second thin film transistor to charge a second pixel voltage based on the data signal, and a voltage controller which controls the first pixel voltage and the second pixel voltage in response to a second gate signal, which is generated after the first gate signal.