Touch Panel Display Driver With Selector Circuit For Resolution Adaptability
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Solution Overview
Problem
In display devices with built-in touch panels, it is challenging to independently adjust image resolution and touch detection resolution due to the fixed number of ICs required, leading to increased unused terminals and adverse effects on frame narrowing.
Innovation Solution
A touch panel display driver with a selector circuit that includes pairs of switching elements, allowing selective connection of source and touch detection terminals based on setting data, enabling flexible configuration of source and touch detection wiring lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed number of ICs are used for display and touch detection, then the driver configuration is simple, but the image resolution and touch detection resolution cannot be independently adjusted, leading to increased unused terminals
Solution Approach 1:
The selector circuit enables each switching element pair to serve dual functions: connecting either source terminals (for display) or touch detection terminals (for touch sensing) to the driver circuit. This multi-functionality allows a single driver IC to adapt to different resolution configurations without requiring separate dedicated circuits for each function.
Solution Approach 2:
The driver configuration transitions from a static, fixed connection to a dynamic, reconfigurable system. The selector circuit responds to control signals that determine whether first or second switching elements are activated, enabling real-time adaptation between different display and touch detection resolution modes based on operational requirements.
2Adaptability or versatility
If more ICs are used to support variable resolutions, then resolution flexibility is improved, but the mounting area increases, adversely affecting frame narrowing
Solution Approach 1:
A single driver IC incorporates the selector circuit that provides universal support for multiple resolution configurations. This eliminates the need for multiple dedicated ICs for different resolution modes, thereby reducing the total mounting area while maintaining full resolution flexibility.
Solution Approach 2:
The patent merges the display driving function and touch detection function into a single integrated driver circuit with shared terminals. By combining these functions and using selector switches to route signals dynamically, the system reduces the number of separate ICs required, directly contributing to frame narrowing.
3Ease of operation
If dedicated source and touch detection terminals are used, then the connection is straightforward, but the number of required terminals increases, reducing light transmittance and increasing frame width
Solution Approach 1:
Selection terminals serve as universal connection points that can be dynamically assigned to either source or touch detection functions. This multi-functional terminal design reduces the total number of dedicated terminals required, as the same physical terminals can handle different signal types based on the activation state of the selector switching elements.
Data Source
AI summary
A touch panel display driver includes a source driver circuit, a touch detection circuit, a selector circuit, a register a plurality of source terminals, a plurality of touch detection terminals, and a plurality of selection terminals. The selector circuit electrically connects the source driver circuit to each of the source terminals, electrically connects the touch detection circuit to each of the touch detection terminals, and electrically connects each of the selection terminals to the source driver circuit or the touch detection circuit.