Cascaded Display Touch Drivers Synchronization via Wire Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In large-size panel driver systems, synchronization of driver chips is inaccurate due to long connecting lines, and static current is generated between driver chips due to process variations, leading to inefficiencies in display and touch operations.
Innovation Solution
A display and touch driver system with operational amplifiers connected in cascade via a wire circuit, where the output nodes of the first stages are connected, and a master driver transmits a reference signal to slave drivers through a wire circuit to synchronize operations, reducing static current and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driver chips are connected via a long connecting line to drive large-size panels, then the driving capability is improved, but synchronization accuracy deteriorates
Solution Approach 1:
The driver system is segmented into multiple driver chips (first driver chip, second driver chip, etc.) that are connected in series through a wire-or connection. Each driver chip processes signals independently and contributes to driving different regions of the large-size panel, enabling the system to handle large panels while maintaining synchronization through the segmented architecture.
Solution Approach 2:
A compensation signal is introduced as an intermediary element to correct synchronization errors. The compensation signal is generated based on the timing differences that occur during signal transmission through the long connecting lines, and it is used to adjust and synchronize the operation of different driver chips, thereby compensating for the synchronization accuracy deterioration.
2Device complexity
If driver chips are connected in wire-or manner, then the system complexity is reduced, but additional static current is generated due to process variation
Solution Approach 1:
The system employs a feedback mechanism where the output of each driver chip is fed back to adjust the operation of subsequent driver chips. This feedback allows the system to dynamically compensate for process variations that cause additional static current in wire-or connections, enabling the maintenance of low power consumption while preserving the simple wire-or connection architecture.
3Area of stationary object
If multiple driver chips are connected in series, then the driving capability for large panels is improved, but synchronization accuracy deteriorates due to long connecting lines
Solution Approach 1:
The driver system is segmented into multiple driver chips (first driver chip, second driver chip, etc.) that are connected in series through a wire-or connection. Each driver chip processes signals independently and contributes to driving different regions of the large-size panel, enabling the system to handle large panels while maintaining synchronization through the segmented architecture.
Solution Approach 2:
A compensation signal is introduced as an intermediary element to correct synchronization errors. The compensation signal is generated based on the timing differences that occur during signal transmission through the long connecting lines, and it is used to adjust and synchronize the operation of different driver chips, thereby compensating for the synchronization accuracy deterioration.
Data Source
AI summary
A display and touch driver system including a plurality of display and touch drivers and a wire circuit is provided. The plurality of display and touch drivers are connected in cascade. The plurality of display and touch drivers are configured to synchronously drive a display and touch panel to perform a touch sensing operation. Each of the display and touch drivers includes an operational amplifier. The operational amplifier includes a first stage and a second stage. An output node of the first stage is coupled to an input node of the second stage. The output nodes of the first stages of the operational amplifiers are connected together via the wire circuit.