In-cell Display Discharge Circuit for Liquid Crystal Polarization
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Solution Overview
Problem
In-cell touch display devices face issues with liquid crystal polarization due to residual charges during standby mode, leading to abnormal displays, especially when the screen is black for an extended period, as the continuous sensing signals cause liquid crystal deflection.
Innovation Solution
A mutual capacitive in-cell display device and driving method that includes a first and second switching transistor connected to a driver integrated circuit, which sends enable signals to discharge data lines to the touch panel, ensuring the first electrode has a predetermined potential, thereby reducing residual charges and preventing polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel continuously scans in standby mode to detect gesture wake-up, then touch sensing function is maintained, but residual charges in the liquid crystal produce polarization leading to abnormal display
Solution Approach 1:
The patent applies preliminary action by proactively discharging residual charges from the liquid crystal before they can cause polarization. The controller detects standby mode and actively manages charge discharge through the touch electrode, preventing the harmful effect before it occurs rather than reacting after abnormal display appears
Solution Approach 2:
The patent converts the harmful residual charges into a beneficial discharge current. By utilizing the touch electrode and controller circuitry, the normally harmful accumulated charges are redirected through a controlled discharge path, transforming the problem into a solution where the same electrical pathways that cause polarization are used to safely eliminate the charges
2Use of energy by moving object
If the display shows black screen for extended period in standby mode, then power consumption is reduced, but liquid crystal maintains deflection angle leading to abnormal display
Solution Approach 1:
The patent implements periodic action by cycling between standby mode with charge discharge and active display mode. The controller periodically manages charge discharge during standby intervals, allowing the display to remain off for extended periods while preventing liquid crystal deflection accumulation, thus maintaining display quality without continuous power consumption
3Reliability
If data lines are discharged to touch panel during standby mode, then residual charges are removed and polarization is prevented, but additional circuit control is required
Solution Approach 1:
The patent applies universality by making the touch electrode serve dual functions: normal touch sensing during active mode and charge discharge path during standby mode. The same controller that manages touch scanning also manages charge discharge by controlling the switch connection, eliminating the need for separate discharge circuitry and reducing overall system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively addresses liquid crystal polarization risks and reduces power consumption by discharging data lines to ground potential during standby mode, ensuring good display quality and touch sensitivity.
Implementation Method 1
the multiple data lines are connected to the touch panel to discharge
Data Source
AI summary
The present disclosure discloses a mutual capacitive in-cell display device and the driving method thereof. The mutual capacitive in-cell display device comprises: a first substrate; a touch panel, which is provided on the first substrate; a driver integrated circuit, which is used to send a first enable signal and a second enable signal; multiple gate lines, each gate line comprising a first switching transistor, the control terminal of the first switching transistor being connected to the driver integrated circuit; multiple data lines, each data line comprising a second switching transistor, the control terminal of the second switching transistor being connected to the driver integrated circuit. When the first switching transistor is turned on in responses to the first enable signal and the second switching transistor is turned on in response to the second enable signal in standby mode, the multiple data lines are connected to the touch panel to discharge.