Liquid Crystal Display Pixel Circuit for Quasi-Impulse Drive
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving high luminance and cost-effectiveness while minimizing image blurring during moving picture display, particularly due to the need for complex signal processing and additional scanning circuits for quasi-impulse drive.
Innovation Solution
A liquid crystal display device structure with a first and second switching device, where the pixel capacitance and storage capacitance are connected to data lines and black signal wiring, respectively, and controlled by different gate lines, allowing for video and black signal writing at the same frequency without requiring separate gate lines and driver circuits for black signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quasi-impulse drive is implemented using conventional methods, then moving picture characteristics are improved, but device complexity increases due to additional gate lines and driver circuits
Solution Approach 1:
The patent makes the existing gate lines and switching devices perform multiple functions: they control both video signal writing and black signal writing within the same frame period. The first and second switching devices in each pixel are controlled by the same gate lines to sequentially write video signals and black signals, eliminating the need for separate dedicated gate lines and driver circuits for black signal writing.
Solution Approach 2:
The patent combines the video signal writing and black signal writing operations into a single integrated process using the same gate line infrastructure. The frame period is divided into a video signal writing period and a black signal writing period, both controlled by the same gate lines, merging what would traditionally require separate scanning circuits into one unified system.
2Reliability
If conventional quasi-impulse drive is used, then image blurring is reduced, but manufacturing cost increases due to additional circuits
Solution Approach 1:
The existing switching devices and gate lines are made multi-functional to control both video and black signal writing, eliminating the need for additional dedicated circuits for black signal writing. This reduces the number of components that need to be manufactured and assembled, thereby reducing manufacturing cost.
Solution Approach 2:
The patent merges the video signal writing circuitry and black signal writing circuitry into a single integrated system using the same gate lines and switching devices, reducing the total component count and simplifying the manufacturing process.
3Reliability
If additional gate drivers are added for black signal writing, then quasi-impulse drive is achieved, but power consumption increases
Solution Approach 1:
The existing gate drivers are made multi-functional to control both video signal writing and black signal writing within the same frame period. By reusing the same gate driving circuits for dual purposes, the patent eliminates the need for additional power-consuming driver circuits while maintaining quasi-impulse drive capability.
Solution Approach 2:
The patent combines the gate driving functions into a single integrated system where the same gate lines and drivers control both video and black signal writing operations, reducing the total power consumption by eliminating redundant driving circuits.
4Reliability
If complex signal processing is used for double-speed drive, then moving picture quality improves, but device complexity and cost increase
Solution Approach 1:
The patent uses periodic action by dividing the frame period into distinct time intervals: a video signal writing period and a black signal writing period. This temporal segmentation allows the system to achieve quasi-impulse drive characteristics through simple periodic switching rather than complex real-time signal processing, maintaining moving picture quality while reducing device complexity.
Data Source
AI summary
To provide a liquid crystal display device capable of improving a moving picture characteristic at a low cost by achieving high luminance of the liquid crystal display device which performs quasi-impulse drive. In the liquid crystal display device of the present invention, a first switching device constituting each pixel has a control terminal connected to a gate line, another control terminal connected to another gate line, and becomes electrically conductive when one of the control terminals is low level while the other is high level. A second switching device has a control terminal connected to the gate line and a control terminal connected to the other gate line. A pixel capacitance and a storage capacitance are connected to data lines via the first switching device, and connected to a black signal supplying wiring via the second switching device. The black signal supplying wiring is common to all the pixels.