Panel Signal Control Circuit for LCD Ghost Elimination
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Solution Overview
Problem
Existing panel signal control circuits for LCDs face incomplete discharge of liquid crystal capacitors due to insufficient voltage levels and short activation periods of TFTs, leading to display ghost issues.
Innovation Solution
Incorporating voltage divider circuits for both input and output voltages in the panel signal control circuit, which ensures that the TFTs are activated with higher voltage levels for longer periods by maintaining VGH at normal working voltage during the discharge process, using PWM IC and Level Shift IC with Vin and VGH voltage divider circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the respective output CK signals are synchronized with VGH, then the discharge function is activated, but the voltage values of the CK signals drop along with VGH causing insufficient activation voltage and short activation period
Solution Approach 1:
The patent segments the voltage control into two independent parts: Vin (input voltage) control for CK signal generation and VGH (output voltage) control for TFT activation. By using separate voltage divider circuits for Vin and VGH, the system can independently optimize the activation period without the voltage values dropping simultaneously, thus extending the TFT activation period while maintaining reliable discharge function activation.
Solution Approach 2:
The patent changes the voltage parameters by introducing a Vin voltage divider circuit that maintains CK signal voltage at a higher level independent of VGH voltage. This parameter separation allows the CK signals to remain at sufficient voltage levels for longer periods, extending the TFT activation period while still enabling the discharge function when VGH drops.
2Reliability
If the respective output CK signals are synchronized with VGH, then the discharge function is activated, but the voltage values of the CK signals are insufficient leading to incomplete liquid crystal capacitor discharge
Solution Approach 1:
The patent segments the voltage control into two independent parts: Vin (input voltage) control for CK signal generation and VGH (output voltage) control for TFT activation. By using separate voltage divider circuits for Vin and VGH, the system can independently optimize the activation period without the voltage values dropping simultaneously, thus extending the TFT activation period while maintaining reliable discharge function activation.
Solution Approach 2:
The patent changes the voltage parameters by introducing a Vin voltage divider circuit that maintains CK signal voltage at a higher level independent of VGH voltage. This parameter separation allows the CK signals to remain at sufficient voltage levels for longer periods, extending the TFT activation period while still enabling the discharge function when VGH drops.
Data Source
AI summary
The present invention provides a panel signal control circuit, a display panel and a display device. The panel signal control circuit comprises: a PWM IC and a level shift IC, and the panel signal control circuit comprises further comprises: a Vin voltage divider circuit; one end of the Vin voltage divider circuit is coupled to an input port of an input working voltage Vin of the PWM IC, and the other end of the Vin voltage divider circuit is grounded; a voltage divider interface of the Vin voltage divider circuit is coupled to a pin a of the Level shift IC, and the pin a is a voltage monitor pin, and as the voltage of the pin a is lower than an activation voltage threshold, respective output clock CK pins of the Level shift IC output sync signals of an output working voltage VGH of the PWM IC.