S-PVA LCD Display Apparatus Viewing Angle Visibility Stabilization
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Solution Overview
Problem
Super-patterned vertical alignment (S-PVA) mode LCDs experience reduced display quality due to varying visibility depending on the user's position, resulting from differences in brightness characteristics at front and lateral viewing angles.
Innovation Solution
A display apparatus and method that employs a timing controller, memory, selector, gamma reference voltage generator, data driving circuit, and gate driving circuit to alternate between high and low gamma values in each frame, applying corresponding data and gate voltages to sub-pixels to stabilize image visibility across different viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If S-PVA mode LCD uses two sub-pixels with different sub-voltages to form domains with different gray-scales, then the gamma curve distortion is prevented and side viewing angle is improved, but visibility varies depending on user position (front vs lateral viewing angles)
Solution Approach 1:
The patent applies periodic action by alternately applying first and second data voltages to the first and second sub-pixels in alternating frames. This periodic switching creates a temporal averaging effect where the human eye perceives an intermediate gray level that prevents gamma curve distortion while maintaining consistent visibility across different viewing angles. The frame-based alternation ensures that both front and lateral viewers experience stable brightness characteristics.
Solution Approach 2:
The patent changes the voltage parameters applied to sub-pixels by using two different data voltages (first data voltage and second data voltage) that correspond to different gray levels. By dynamically adjusting these voltage parameters in an alternating fashion, the system achieves an intermediate perceived gray level that corrects gamma distortion while maintaining uniform visibility across viewing angles.
2Manufacturing precision
If S-PVA mode LCD applies two different sub-voltages to main and sub-pixel electrodes, then intermediate gray level is achieved and gamma curve distortion is prevented, but brightness characteristic varies with viewing angle
Solution Approach 1:
The periodic alternation of first and second data voltages in successive frames creates a temporal averaging effect that produces a stable intermediate gray level perception. This periodic switching mechanism ensures that the displayed image maintains consistent brightness characteristics across different viewing angles while achieving precise gray level control through the alternating voltage application.
Solution Approach 2:
The patent maintains continuous useful action by alternating the application of first and second data voltages in successive frames without interruption. This continuous alternating process ensures that both sub-pixels remain actively engaged in displaying information, providing uninterrupted visual output with improved gray level precision and viewing angle adaptability.
Data Source
AI summary
A display apparatus and a method of driving the same in which a selector outputs one of two high gamma values and one of two low gamma values in one frame unit in response to a selection signal. A gamma reference voltage generator outputs a high gamma reference voltage corresponding to the selected high gamma value and a low gamma reference voltage corresponding to the selected low gamma value. A data driving circuit outputs a first data voltage based on the high gamma reference voltage during a first active period and outputs a second data voltage based on the low gamma reference voltage during a second active period. Thus, a display panel may display an image using data voltages corresponding to different gamma curves in one frame unit, thereby improving visibility of the display apparatus.