LCD Storage Capacitor Counter Electrode Oscillation Period
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The viewing angle dependence of the γ characteristic in liquid crystal display devices, particularly in MVA and ASM modes, leads to variations in grayscale display when viewed straight versus obliquely, and existing solutions face challenges in maintaining high contrast ratios and productivity, especially in large-screen or high-definition LCDs.
Innovation Solution
A liquid crystal display device with a matrix pattern of pixels, each comprising a first and second subpixel with independently controlled storage capacitor counter electrodes, utilizing oscillating voltages with extended periods to minimize waveform blunting and maintain display quality, even in large-screen or high-definition panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oscillation period of the storage capacitor counter voltage is extended to reduce waveform blunting, then the display quality is maintained, but the response time increases
Solution Approach 1:
The patent applies periodic oscillating voltages to the storage capacitor counter electrodes with carefully controlled periods. The oscillation period is set to be equal to or longer than the horizontal scanning period to prevent waveform blunting while maintaining timely response. This periodic action allows the system to balance between avoiding distortion and responding quickly to image changes.
2Reliability
If the oscillation period is extended to minimize waveform blunting, then display quality is maintained, but the contrast ratio may deteriorate
Solution Approach 1:
The patent systematically varies the oscillation period parameter within specific ranges (equal to or longer than horizontal scanning period) to optimize the balance between waveform fidelity and display performance. By controlling this parameter, the system maintains both high display quality and adequate contrast ratio without extreme values.
3Reliability
If independent storage capacitor counter electrodes are used for each subpixel, then the viewing angle dependence of γ characteristic is reduced, but the device complexity increases
Solution Approach 1:
The patent divides the display into multiple subpixels (first and second subpixels) within each pixel, with each subpixel having its own storage capacitor counter electrode. This segmentation allows independent voltage control for each subpixel, enabling differential voltage application that compensates for viewing angle effects on the γ characteristic.
Solution Approach 2:
The patent applies different voltages to different subpixels based on their specific viewing angle characteristics. By providing independent storage capacitor counter electrodes, each subpixel can be locally optimized to maintain consistent γ characteristics across various viewing angles, rather than using a uniform approach for all pixels.
4Reliability
If the oscillation period is extended to reduce waveform blunting, then display quality is maintained, but the productivity decreases
Solution Approach 1:
The patent uses periodic oscillating voltages with periods optimized to balance waveform quality and response speed. By setting the oscillation period to be equal to or longer than the horizontal scanning period, the system maintains display quality while enabling faster response to image changes, thereby improving manufacturing efficiency and productivity.
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 the viewing angle dependence of the γ characteristic and maintains high display quality by extending the oscillation period of the storage capacitor counter voltage, preventing waveform blunting and ensuring consistent luminance across the screen.
Implementation Method 1
the major axes of its liquid crystal molecules, exhibiting positive dielectric anisotropy, are substantially parallel to the respective principal surfaces of upper and lower substrates
Implementation Method 2
The TN mode liquid crystal display device utilizes variation in the optical rotatory characteristic of its liquid crystal layer due to the change of orientation directions of the liquid crystal molecules
Data Source
AI summary
In one embodiment of the present invention, a large-screen or high-definition LCD is provided with its display quality improved significantly by reducing the viewing angle dependence of γ characteristic. Each pixel includes first and second subpixels, to which different voltages are applicable. The device further includes electrically independent storage capacitor trunks, each of which is electrically connected to the respective storage capacitor counter electrodes of either the first or second subpixels through storage capacitor lines. The pixels include pixels belonging to a first display area and pixels belonging to a second display area. The first and second display areas can be scanned independently of each other. And the storage capacitor trunks include a first storage capacitor trunk belonging to the first display area and a second storage capacitor trunk belonging to the second display area.