Display Device Double Source Line Switching Circuit
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Solution Overview
Problem
Existing liquid-crystal display devices face challenges in reducing circuit scale while maintaining image visibility and viewing angle, particularly in high-resolution displays like 8K at 120 Hz, where the narrow crimp pitch at ICs makes mounting difficult and increases costs.
Innovation Solution
A display device with a double source structure, where two source lines are wired to each column of pixels, and switches are used to connect these lines to a single signal line, reducing the number of ICs required in the source drive circuit and enabling efficient grayscale control for improved visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple source lines are wired to each column of pixels to improve image visibility and viewing angle, then the display quality is improved, but the circuit scale and number of ICs required increases
Solution Approach 1:
The patent merges multiple source lines (first source line and second source line) that are wired to the same column of pixels and connects them to a single signal line through switches. This combining approach reduces the number of ICs required in the source drive circuit while maintaining the dual source line structure needed for improved image visibility and viewing angle characteristics
Solution Approach 2:
The patent makes a single signal line serve multiple functions by connecting it to both the first source line and second source line through switches. This multi-functional approach allows one signal line to control multiple source lines, reducing the overall circuit scale while maintaining the benefits of multiple source lines for display quality
2Ease of manufacture
If the number of ICs in the source drive circuit is reduced to decrease circuit scale, then manufacturing cost is reduced, but the ability to control grayscale for improved visibility may be compromised
Solution Approach 1:
The patent introduces switches that can dynamically connect or disconnect source lines from the signal line based on operational requirements. This dynamic switching capability allows the circuit to maintain grayscale control functionality while reducing the number of permanent IC connections, thereby lowering manufacturing cost without sacrificing image visibility
Solution Approach 2:
The patent uses switches as intermediary components between the reduced number of signal lines and the multiple source lines. These intermediary switches enable efficient signal distribution and grayscale control, allowing the system to achieve both cost reduction through fewer ICs and maintained image visibility through proper signal routing
Data Source
AI summary
This display device is provided with: a plurality of pixels (3); a plurality of source lines (SL); a source drive circuit (12a); and a plurality of switches (40, 41). The plurality of pixels are arranged in a matrix, and form a display region (10a) in which an image is displayed. The plurality of source lines (SL) are wired in the row direction of the pixel matrix on the display region, and connected to the respective pixels. The source drive circuit has a plurality of signal lines (PL) through which signals supplied to the respective pixels via the source lines are outputted. The switches are provided between the source lines and the signal lines. More than one of the source lines are wired to the pixels in the same row in the matrix. The source lines (SLe, SLo) for pixels in the same row and one of the signal lines of the source drive circuit, are connected via the switches.