Discharging Circuitry for Display Panel Residual Charge Protection
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Solution Overview
Problem
Display devices such as LCDs and OLEDs face device deterioration due to residual charges that remain in pixels and driver circuits when the display panel is powered off, leading to a shortened lifespan.
Innovation Solution
Incorporating discharging circuitry between the power supply and components like the gate driver, data driver, and gamma voltage generator to rapidly discharge residual charges to ground when the panel is powered off, utilizing thin-film transistors and resistors to control the discharging process, allowing for adjustable discharging times without increasing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discharging circuitry is added to discharge residual charges, then device reliability is improved, but device complexity increases
Solution Approach 1:
The discharging circuitry is designed to automatically activate when power is supplied to the display panel, using the power supply itself as the trigger mechanism. The circuit monitors the power state and autonomously performs charge discharge operations without requiring external control signals, thereby improving reliability while minimizing control complexity.
Solution Approach 2:
The patent implements dedicated discharge paths that efficiently redirect residual charges from capacitive elements (such as storage capacitors in pixels and decoupling capacitors in driver circuits) to ground. By providing explicit discharge routes, the circuit rapidly eliminates harmful residual charges, extending device lifespan and improving reliability.
2Reliability
If multiple discharging circuits are added for different components, then charge discharge effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The discharging circuitry is designed with a modular architecture where identical circuit blocks can serve multiple functions. The same discharge circuit design is reused across different components (gate driver, data driver, gamma voltage generator), allowing standardized manufacturing processes and reducing overall production costs despite the presence of multiple discharge paths.
Solution Approach 2:
The patent divides the discharge function into separate, independent circuit segments, each dedicated to a specific component (gate driver discharge circuit, data driver discharge circuit, gamma voltage generator discharge circuit). This segmentation allows for targeted implementation where only necessary discharge paths are constructed, optimizing manufacturing efficiency and cost-effectiveness.
3Reliability
If discharging time is extended to ensure complete charge removal, then device protection is improved, but productivity decreases
Solution Approach 1:
The discharging circuitry is designed to activate immediately upon power supply connection, performing charge discharge operations in advance before the display panel begins normal operation. By preemptively clearing residual charges, the system protects components during power transitions without requiring extended discharge times that would delay subsequent operations.
Solution Approach 2:
The discharge operation is implemented as a periodic event that occurs at each power on/off transition rather than as a continuous process. The circuit activates during power state changes, providing sufficient discharge time during these natural transition periods without interfering with the display panel's normal productivity during active operation.
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
This solution effectively protects the display panel by quickly discharging residual charges, optimizing panel operation during power on/off cycles, and reducing the risk of device deterioration, while also allowing for cost-effective adjustment of discharging times.
Implementation Method 1
a first discharging circuitry connected to and disposed between a boost converter of a power supply and a level shifter of a GIP (gate in panel) driver so as to discharge charges remaining in the level shifter of the GIP driver to a ground when the display panel is powered off
Data Source
AI summary
A display device capable of discharging residual charges includes a discharging circuitry to discharge charges remaining in a GIP driver, a Gate D-IC, a Source D-IC, a Gamma IC, etc. to a ground GND when a display panel is powered off, so that the display device protects the display panel by rapidly discharging residual charges that may accumulate on the display panel and a printed circuit board when power is off.