Active LCD Panel Regulator for Leakage Voltage Stability
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Solution Overview
Problem
Active liquid crystal display panels experience voltage drops between output terminals and gate driving circuit voltages due to residual charges and leakage currents, leading to abnormal frame displays when powered on after a period of inactivity.
Innovation Solution
Incorporating a regulator with diodes in the analog buffer circuit to maintain reference voltages, ensuring that the first voltage remains at the first reference voltage and the second voltage remains at the second reference voltage, even when a leakage path forms, thereby preventing insufficient voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display panel is powered down for a period of time, then residual charges are released and power consumption is reduced, but voltage nodes become undetermined due to leakage currents causing abnormal display frames
Solution Approach 1:
The regulator is configured to maintain the voltage of the output terminal at a predetermined voltage level before the display panel is powered off. This preliminary voltage stabilization ensures that when the panel is subsequently powered on after a period of inactivity, the gate driving circuit can properly drive the scan lines and control pixel switching, preventing abnormal frame display caused by undetermined voltage nodes from leakage currents.
Solution Approach 2:
The regulator implements a feedback mechanism by continuously monitoring and adjusting the voltage at the output terminal of the gate driving circuit. The regulator compares the actual voltage with the predetermined reference voltage and dynamically adjusts its output to maintain the voltage within the required range, compensating for voltage drops caused by leakage currents during idle periods.
2Power
If analog buffers are added to increase driving capability, then the ability to drive scan lines is improved, but voltage drops occur between output terminals and gate driving circuit due to leakage currents
Solution Approach 1:
The regulator acts as an intermediary component between the power supply and the gate driving circuit output terminal. It isolates the voltage instability caused by leakage currents in the analog buffers from affecting the overall system, maintaining a stable predetermined voltage at the output terminal regardless of the buffering operations or leakage effects.
Solution Approach 2:
The regulator dynamically adjusts electrical parameters (voltage level) at the output terminal to compensate for changes caused by leakage currents. By maintaining the voltage at a predetermined level through active regulation, the system compensates for the voltage drops that occur when analog buffers operate during idle periods, ensuring stable operation upon reactivation.
Data Source
AI summary
An active liquid crystal display panel includes a pixel array, a gate driving circuit, a data driving circuit, and an analog buffer. The gate driving circuit is used for driving M first scan lines where M is a natural number. The analog buffer is coupled to the gate driving circuit and includes M buffer circuits and a regulator. Each buffer circuit drives a corresponding second scan line according to an output signal of a corresponding first scan line of the M first scan lines, and the regulator is used for maintaining at least one reference voltage supplied to the M buffer circuits.