Integrated Display Touch Controller Using DisplayPort Auxiliary Channel
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Solution Overview
Problem
High-speed graphical display systems with touch screen capabilities require separate interfaces for graphical and tactile data, leading to increased costs and a larger footprint due to the need for multiple cables.
Innovation Solution
An integrated controller utilizing a DisplayPort or embedded DisplayPort interface to communicate control and data signals for both display and touch functions, incorporating a display panel interface, touch panel interface, and a control circuit that processes signals, including a display controller and touch controller with protocol conversion, allowing for single-channel communication of both display and touch data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate interfaces are used for graphical display and touch screen capabilities, then reliable data transmission for both functions is achieved, but interface costs and device footprint increase due to multiple cables
Solution Approach 1:
The patent combines graphical display and touch screen interfaces into a single DisplayPort connection. The DisplayPort interface simultaneously carries video data, audio data, and touch input data through integrated signal channels, eliminating the need for separate DVI/VGA and USB cables. This merging reduces the number of cables and connectors while maintaining reliable data transmission for both display and touch functions.
Solution Approach 2:
The DisplayPort interface is designed to perform multiple functions simultaneously - it serves as both a video output interface and a touch input interface. The auxiliary channel of the DisplayPort is utilized to transmit touch controller data, allowing the same physical connection to handle both graphical display output and tactile input communication, thereby reducing overall system complexity.
2Reliability
If separate interfaces are used for graphical display and touch screen capabilities, then dedicated signal paths for each function are provided, but cable quantity and footprint increase
Solution Approach 1:
Multiple signal paths (video, audio, touch data) are merged into a single DisplayPort cable connection. The cable simultaneously carries high-speed video signals through main lanes and touch controller data through the auxiliary channel, reducing the total cable length and quantity needed while maintaining dedicated signal paths through logical separation within the unified interface.
3Adaptability or versatility
If multiple cables are used for display and touch functions, then independent communication channels are established, but connection costs and device footprint increase
Solution Approach 1:
The DisplayPort interface is configured to provide versatile communication capabilities through a single connection. It supports video output, audio output, and touch input simultaneously, with the auxiliary channel enabling bidirectional communication for touch data. This multi-functional approach maintains interface flexibility while reducing connection complexity by eliminating the need for multiple separate cables and connectors.
Data Source
AI summary
An integrated controller for an integrated display and touch panel and its associated method provide (a) a DisplayPort or embedded DisplayPort interface for communicating control and data signals for both display and touch functions between a host system and the integrated controller, wherein the touch control and data signals are communicated over an auxiliary channel of the DisplayPort or embedded DisplayPort interface; (b) a display panel interface for communicating display data and control signals between the integrated controller and a display monitor; (c) a touch panel interface for communicating touch data and control signals between the integrated controller and a touch panel; and (d) a control circuit which processes the display and touch control and data signals of the DisplayPort or embedded DisplayPort interface, the display data and control signals of the display panel interface and the touch data and control signals of the touch panel interface.