TDDI Driver Circuit Segmentation for EMI and Thermal Management
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Solution Overview
Problem
Conventional Touch and Display Driver Integration (TDDI) chips face issues with temperature variation and electromagnetic interference due to high voltage devices, which affect their performance and reliability.
Innovation Solution
A driver circuit design that includes a TDDI circuit and an external circuit, where the external circuit generates different output voltages based on input voltages from a power supply circuit, with a switch device controlled by a control signal to manage voltage endurance and reduce interference, allowing the TDDI circuit to operate efficiently during both display and touch sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage devices are integrated into the TDDI chip to provide driving signals to the display panel, then the driving capability is improved, but electromagnetic interference is generated and temperature variation increases
Solution Approach 1:
The patent divides the driver circuit into two separate chips: a TDDI chip for touch sensing and display driving control, and a separate high voltage driver chip for generating high voltage driving signals. This segmentation isolates the high voltage devices from the sensitive TDDI circuitry, reducing electromagnetic interference and temperature variation while maintaining driving capability.
Solution Approach 2:
The high voltage devices are extracted from the TDDI chip and placed on a separate driver chip. This extraction removes the source of electromagnetic interference and excessive heat generation from the integrated TDDI circuit, allowing the TDDI chip to operate with lower voltage and reduced thermal stress.
2Power
If high voltage devices are integrated into the TDDI chip, then the driving capability is improved, but temperature variation of the TDDI chip increases
Solution Approach 1:
The patent divides the driver circuit into two separate chips: a TDDI chip for touch sensing and display driving control, and a separate high voltage driver chip for generating high voltage driving signals. This segmentation isolates the high voltage devices from the sensitive TDDI circuitry, reducing electromagnetic interference and temperature variation while maintaining driving capability.
Solution Approach 2:
The high voltage devices are extracted from the TDDI chip and placed on a separate driver chip. This extraction removes the source of electromagnetic interference and excessive heat generation from the integrated TDDI circuit, allowing the TDDI chip to operate with lower voltage and reduced thermal stress.
3Adaptability or versatility
If two separate driver chips are used for display and touch sensing functions, then functional performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the touch sensing driver and display driver functions into a single integrated TDDI chip, while using a separate high voltage driver chip only for voltage generation. This merging reduces the total number of chips compared to having completely separate display and touch drivers, simplifying the overall system while maintaining functional performance.
Data Source
AI summary
A driver circuit configured to drive a display panel to perform a display operation and a touch sensing operation is provided. The driver circuit includes a touch and display driver integration (TDDI) circuit and an external circuit. The TDDI circuit is configured to drive the display panel to perform the display operation and the touch sensing operation during a display period and a touch sensing period, respectively. The TDDI circuit outputs a reference signal. The external circuit is disposed outside of the TDDI circuit. The external circuit is configured to output a first output voltage and a second output voltage on the basis of the reference signal from the TDDI circuit. The first output voltage is larger than the second output voltage.