Display Control Circuit for Image Persistence Reduction
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Solution Overview
Problem
Large display apparatuses experience persistence of image due to slow discharge of charge when turned off, which is exacerbated by the slow discharge rate of voltages VAA and VGH, leading to noticeable image persistence.
Innovation Solution
A control circuit with a voltage control circuit, voltage detection circuit, switch circuit, and discharging circuit is implemented to rapidly discharge the main voltage VAA when the digital logic voltage VDD drops below a reference voltage, reducing persistence of image while minimizing power consumption by only discharging when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ground resistance is arranged at each power supply node to accelerate electric discharge, then the discharge speed of VAA and VGH is improved, but the power consumption of the system increases
Solution Approach 1:
The patent applies dynamic control by using a control circuit that dynamically adjusts the discharge resistance based on real-time voltage detection. The circuit transitions from a static resistance configuration to a dynamic one where the resistance value changes according to the voltage state, achieving fast discharge only when necessary (when voltage drops below threshold) and high resistance otherwise, thus resolving the contradiction between discharge speed and power consumption
Solution Approach 2:
The control circuit implements self-service by automatically detecting the voltage state and controlling the discharge process without external intervention. The voltage detection circuit monitors the voltage level and automatically activates the discharge path when the voltage drops to the threshold, eliminating the need for manual control while optimizing the balance between discharge speed and power consumption
2Use of energy by moving object
If the display apparatus is turned off, then power consumption is reduced, but the persistence of image becomes more obvious due to slow charge discharge
Solution Approach 1:
The patent applies periodic action through the voltage detection circuit that periodically monitors the voltage state and triggers discharge only when the voltage drops below the threshold. This creates a periodic control pattern where the discharge is activated at specific moments (when needed) and deactivated otherwise, allowing the system to reduce power consumption while still eliminating persistence of image when necessary
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
The solution effectively reduces persistence of image by accelerating the discharge of VAA and VGH, thereby minimizing power consumption and image retention when the display is turned off.
Implementation Method 1
a voltage detection circuit, a first input end of the voltage detection circuit being connected to an output end of the voltage control circuit, and a second input end of the voltage detection circuit being connected to the second power input end
Implementation Method 2
Charge stored in a display panel is discharged when the display apparatus is turned off. The bigger the size of the display apparatus is, the longer the time duration required for the electric discharge.
Data Source
AI summary
Disclosed are a control circuit, a display apparatus and a control method for a control circuit. An input end of a voltage control circuit is connected to a first power input end, and an output end of the voltage control circuit is connected to a first input end of a voltage detection circuit; a second input end of the voltage detection circuit is connected to a second power input end, and an output end of the voltage detection circuit is connected to a controlled end of a switch circuit; an input end of the switch circuit is connected to the first power input end, and an output end of the switch circuit is connected to an input end of the discharging circuit.