LCD Driving Circuit Shared Scan Line Aperture Ratio
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Solution Overview
Problem
The existing liquid crystal display (LCD) driving circuits face challenges in improving the aperture ratio and display brightness due to increased space requirements for scan lines, data lines, and thin film transistors, which reduce the pixel electrode area and light transmittance.
Innovation Solution
The proposed driving circuit design includes pixel units in adjacent rows sharing a scan line with reverse polarities and different types of thin film transistors (n-type and p-type) for each row, allowing for reduced scan line quantity and space occupation, while maintaining high resolution and brightness through controlled voltage inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the quantities or volumes of the scan line, data line, thin film transistor, and common electrode wiring are increased to improve resolution ratio, then the resolution ratio is improved, but the aperture ratio of the pixel area is decreased and light transmittance is reduced
Solution Approach 1:
The patent merges the scan lines for two adjacent rows into a single shared scan line. The scan line is configured to sequentially provide driving voltages to pixel units in different rows at different time points, thereby reducing the total number of scan lines while maintaining the ability to address all pixel units individually. This merging reduces the space occupied by wiring, allowing for a larger aperture ratio without compromising resolution.
Solution Approach 2:
The patent introduces dynamic voltage control where the scan line provides different driving voltages (first driving voltage for even rows, second driving voltage for odd rows) at different time points. This dynamic approach allows a single static scan line structure to serve multiple rows sequentially, reducing the need for additional scan lines while maintaining proper addressing of all pixel units for high resolution display.
2Measurement precision
If the quantities or volumes of the scan line, data line, thin film transistor, and common electrode wiring are increased to improve resolution ratio, then the resolution ratio is improved, but the display brightness is reduced
Solution Approach 1:
By merging scan lines for two adjacent rows into one shared scan line, the patent reduces the total wiring density in the display structure. This reduction in wiring allows for a larger aperture ratio, meaning more of the pixel area is available for light transmission rather than being occupied by conductive lines. Consequently, display brightness is improved while maintaining the high resolution capability through the sequential addressing mechanism.
3Area of stationary object
If the scan line quantity is reduced to increase aperture ratio, then the aperture ratio is improved, but the control of pixel units in different rows becomes more complex
Solution Approach 1:
The patent implements periodic action by alternating the function of the shared scan line between serving even rows and odd rows at different time intervals. The scan line periodically switches between providing the first driving voltage to even rows and the second driving voltage to odd rows. This periodic temporal division allows a single scan line to control multiple rows without permanent structural complexity, as the control logic follows a simple repeating pattern.
Solution Approach 2:
The patent applies preliminary action by pre-defining which rows (even or odd) will be addressed during each time period based on their row number characteristics. This preliminary classification allows the control system to automatically determine the appropriate driving voltage and timing for each row without requiring complex real-time calculations, thereby reducing control complexity while enabling the shared scan line to properly address all pixel units.
Data Source
AI summary
A driving circuit, which includes: a plurality of pixel units arranged in a matrix; at least one scan line, the pixel units in two adjacent rows share one scan line, the scan line inputs a first driving voltage to the pixel units in row i, and inputs a second driving voltage to the pixel units in row i+1, and the first driving voltage and the second driving voltage have reverse polarities; at least one data line, and each data line connects the pixel units in a corresponding column; a controller, connected to the scan line and the data line simultaneously and configured to control timing outputs of the scan line and the data line.