Sub-Pixel Charge Transfer Circuit for LCD Viewing Angle
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Solution Overview
Problem
Liquid crystal display devices face challenges with low image quality, particularly due to large viewing angle dependence, low contrast, slow response speed, and high power consumption, which are exacerbated by the need for increased circuit complexity and cost in current methods for improving viewing angle characteristics.
Innovation Solution
A circuit with multiple switches is used to transfer charge between sub-pixels and capacitor elements, allowing for the application of desired voltages without external multiple voltage applications, and a period for displaying black is introduced to enhance image quality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pixel is divided into two sub-pixels with separate signal lines and drivers, then viewing angle characteristics are improved, but manufacturing cost and power consumption increase
Solution Approach 1:
The patent merges the signal lines for first and second sub-pixels into a single shared signal line. The pixel electrode is divided into first and second regions that share the same signal line connection, eliminating the need for separate signal lines and reducing circuit scale while maintaining the ability to display different grayscale values in different regions through temporal multiplexing
Solution Approach 2:
The patent employs periodic switching of switches to selectively connect the pixel electrode to different capacitor elements in alternating periods. During first periods, the first region is driven; during second periods, the second region is driven. This periodic action allows different grayscale values to be applied to different sub-pixel regions using a single signal line, improving viewing angle without increasing circuit complexity
2Adaptability or versatility
If multiple signal lines and drivers are used for sub-pixels, then viewing angle is improved, but power consumption increases
Solution Approach 1:
The patent combines multiple signal lines into a single shared signal line that serves both first and second sub-pixel regions. By merging the signal transmission paths and using temporal multiplexing with switches, the system reduces the number of active signal lines and drivers, thereby reducing power consumption while maintaining improved viewing angle characteristics through selective regional driving
3Manufacturing precision
If circuit scale is increased for high definition, then definition is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges signal lines for multiple sub-pixel regions into a single shared signal line, reducing the total number of signal lines required for high-definition displays. This merging approach maintains the ability to address individual pixels with high precision while reducing manufacturing cost by eliminating redundant signal line infrastructure
Solution Approach 2:
The patent makes a single signal line universal by enabling it to serve multiple sub-pixel regions through temporal multiplexing. The same signal line is used to drive different regions at different times, allowing high-definition capability without proportionally increasing the number of signal lines and associated manufacturing costs
Data Source
AI summary
With a display device using a pixel which includes a sub-pixel, the display device with improved viewing angle and quality of moving image display is provided without increase in power consumption by driving of the sub-pixel. A circuit which can change conducting states by a plurality of switches is provided, and charge in a plurality of sub-pixels and a capacitor element is transported mutually, so that desired voltage is applied to the plurality of sub-pixels without applying voltage in plural times from external. Moreover, a period in which each sub-pixel displays black is provided in accordance with transfer of charge.