Liquid Crystal Driver IC Universal Terminal Assignment
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Solution Overview
Problem
The development of liquid crystal driver ICs for in-cell touch panels is costly and time-consuming due to the need for separate development for different liquid crystal display panel configurations, such as a-Si single channel, p-Si single channel, and CMOS circuit configurations.
Innovation Solution
A liquid crystal display device with a semiconductor chip that supplies counter voltage and touch panel scanning voltage to divided counter electrodes, using a scanning line driving circuit and counter electrode selecting circuit integrated within the liquid crystal display panel, allowing for shared use of terminals and reduced terminal count, and incorporating a CMOS circuit configuration for efficient touch panel operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate liquid crystal driver ICs are developed for each display panel configuration (a-Si, p-Si, CMOS), then each configuration can be optimized for its specific circuit type, but development costs and development time increase significantly
Solution Approach 1:
The liquid crystal driver IC is designed with a universal terminal assignment structure that can adapt to multiple circuit configurations (a-Si single channel, p-Si single channel, and CMOS). The same terminal assignments can be used across different configurations by selectively connecting terminals based on the specific circuit type, eliminating the need for separate IC developments for each configuration while maintaining optimization for each circuit type.
2Reliability
If separate liquid crystal driver ICs are developed for each display panel configuration, then each configuration can be optimized, but manufacturing costs increase due to multiple IC designs
Solution Approach 1:
A single liquid crystal driver IC design with universal terminal assignments serves multiple circuit configurations, reducing manufacturing costs by eliminating the need to produce separate ICs for a-Si, p-Si, and CMOS configurations. The same IC can be manufactured in volume for all configurations, achieving cost economies of scale while maintaining configuration-specific optimization through selective terminal connections.
3Adaptability or versatility
If multiple terminal assignments are provided for different circuit configurations, then each configuration can be properly supported, but the number of terminals and device complexity increase
Solution Approach 1:
The liquid crystal driver IC uses a set of common terminals that serve multiple functions across different circuit configurations. By designing terminal assignments that can be selectively activated or deactivated based on the specific configuration (a-Si, p-Si, or CMOS), the IC achieves multi-configuration support without requiring separate terminal sets for each type, thereby reducing overall terminal count and device complexity.
Solution Approach 2:
The terminal assignment structures for different circuit configurations are merged into a single unified terminal set. Common terminals are shared across configurations, and configuration-specific terminals are integrated into the same terminal group, allowing the IC to support multiple configurations with a reduced terminal count compared to having separate terminal sets for each configuration.
Data Source
AI summary
In a liquid crystal display device, a second substrate includes a detection electrode of a touch panel, pixels include pixel electrodes and counter electrodes, the counter electrodes are divided into a plurality of blocks, the counter electrodes of the divided blocks are provided in common to the pixels on a plurality of display lines being side by side, the counter electrodes of the divided blocks are used as scanning electrodes of the touch panel as well, the liquid crystal display device includes a semiconductor chip configured to supply a counter voltage and a touch panel scanning voltage to the counter electrodes of the divided blocks, the semiconductor chip includes a first terminal group formed on a side of a display area side configured by the plurality of pixels.