LCD Gate Line Discharger Circuit for Residual Image Elimination
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Solution Overview
Problem
LCD devices using the previous gate structure face challenges in rapidly discharging the low gate voltage from auxiliary storage capacitors, leading to residual images due to slow natural exponential decay, which hinders prompt image removal.
Innovation Solution
Incorporating a discharger that supplies a pulse voltage to the gate line, allowing the auxiliary storage capacitor to be discharged to ground voltage, utilizing a high gate voltage to expedite this process, thereby overcoming the slow discharge rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the auxiliary storage capacitor discharges through natural exponential decay, then the discharge process is simple and requires no additional components, but the discharge speed is slow causing residual images
Solution Approach 1:
The discharger circuit is pre-configured and activated only when needed (when source voltage is blocked), performing the discharge action in advance before residual images can form. This allows the system to maintain simplicity during normal operation while enabling rapid discharge when required.
Solution Approach 2:
The discharger circuit acts as an intermediary component between the auxiliary storage capacitor and ground voltage, providing a controlled discharge path that accelerates voltage removal without requiring fundamental changes to the existing capacitor structure or operation.
2Reliability
If a discharger circuit is added to rapidly discharge the gate line, then residual images are eliminated and response time improves, but device complexity increases
Solution Approach 1:
The discharger circuit is designed to automatically activate when source voltage is blocked, detecting the condition and performing discharge without requiring external control signals. This self-service mechanism reduces control complexity while maintaining reliable image clearing functionality.
Solution Approach 2:
The discharger circuit changes the voltage parameter on the gate line from a charged state to ground voltage rapidly, fundamentally altering the discharge behavior from slow natural decay to fast controlled discharge, thereby improving reliability without proportionally increasing complexity.
3Stability of the object's composition
If the gate line voltage is not rapidly discharged, then the auxiliary storage capacitor maintains its charge, but residual images persist on the screen
Solution Approach 1:
The discharge operation is performed periodically or on-demand when source voltage is blocked, rather than continuously. This periodic intervention maintains voltage stability during normal operation while eliminating residual images when needed, balancing both requirements.
Solution Approach 2:
The discharger circuit applies a counter-action (rapid discharge) to prevent the harmful effect (residual images) from occurring. By acting in advance when source voltage is blocked, it neutralizes the potential problem before it manifests as visible residual images.
Data Source
AI summary
An liquid crystal display (LCD) device includes an LCD panel provided with a plurality of pixels, wherein the pixels are defined by a plurality of gate and data lines formed perpendicularly, an auxiliary storage capacitor formed in each of the pixels, a gate driver to drive the gate lines in sequence by supplying a scan pulse voltage to the gate lines of the LCD panel, wherein the scan pulse voltage is comprised of a high gate voltage and a low gate voltage, and a discharger to supply a pulse voltage to the gate line based on a source voltage for operating the LCD panel, wherein the discharger enables the auxiliary storage capacitor to be discharged to the ground voltage as the voltage of the gate line approaches the ground voltage.