GOA Circuit Integrating Touch and Display Scanning
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Solution Overview
Problem
In In Cell Touch display panels, the existing touch circuit architecture requires complex operations and larger chip areas due to time division driving of drive lines and common electrodes, leading to increased cost, signal delay, and power consumption.
Innovation Solution
A Gate Driver on Array (GOA) circuit is introduced, featuring a drive line scan control signal generation unit and multiple GOA groups connected in series to realize a shift register function, reducing the need for additional drive circuits and directly connecting gate lines to the GOA circuit within the display panel, thereby decreasing chip area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time division driving is used to connect drive lines with common electrodes through peripheral circuits, then the touch function can be realized, but the chip area increases and cost increases
Solution Approach 1:
The patent merges the drive line scanning function and touch detection function into a single integrated circuit. The GOA circuit simultaneously performs display scanning and touch scanning by time-division multiplexing the same hardware resources, eliminating the need for separate peripheral circuits and reducing chip area.
Solution Approach 2:
The patent makes the GOA circuit multi-functional by enabling it to perform both display driving and touch detection. The same GOA units and signal lines are used for both purposes through time-division multiplexing, where the circuit switches between display scanning mode and touch scanning mode based on timing signals.
2Adaptability or versatility
If time division signal processing and capacitance change computation are performed in the touch chip, then the touch function can be realized, but the device complexity increases
Solution Approach 1:
The patent extracts the complex signal processing and capacitance computation functions from the touch chip and relocates them to the display driver circuitry. The GOA circuit directly detects capacitance changes during scanning and generates touch detection signals without requiring separate processing units in the touch chip.
Solution Approach 2:
The GOA circuit performs self-service by simultaneously executing display scanning and touch scanning functions using the same hardware resources. The circuit monitors capacitance changes during the scanning process and generates appropriate detection signals without requiring external processing assistance.
3Adaptability or versatility
If peripheral circuits are added to connect drive lines with common electrodes, then the touch function can be realized, but the power consumption increases
Solution Approach 1:
The patent merges the power consumption of separate touch scanning circuits into the existing display driver power budget. By using the same GOA units and signal lines for both display and touch functions through time-division multiplexing, the patent eliminates additional power consumption from separate peripheral circuits.
4Adaptability or versatility
If additional drive circuits are used for touch scanning, then the touch function can be realized, but the signal delay increases
Solution Approach 1:
The patent merges the touch scanning path with the display scanning path in the same GOA circuit. Since the same signal lines and switching elements are used for both functions, there is no additional signal transmission delay introduced by separate peripheral circuits or interfaces.
Data Source
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AI summary
A GOA circuit, a driving method thereof and a display apparatus are provided, the GOA circuit comprising: a drive line scan control signal generation unit operative to generate a drive line scan clock signal and a drive line scan pulse signal; multiple GOA groups (102) operative to acquire the drive line scan clock signal, to generate GOA group (102) output signals sequentially according to GOA group (102) input signals, wherein the GOA group (102) output signal generated by one of the GOA groups (102) is the GOA group (102) input signal of a next GOA group (102) so as to realize a shift register function of the multiple GOA groups (102); multiple drive line scan signal generation modules (103) operative to acquire the GOA group (102) output signals and the drive line scan pulse signal, and to generate drive line scan signals sequentially; multiple gate line groups (104) operative to be applied with the drive line scan signals, so as to complete drive line scan for the multiple gate line groups (104) sequentially. The above circuit has both the display and the touch scan function, thereby the chip area, the cost and the area of the peripheral wirings can be decreased.