Gate Driver Voltage Control for Rapid LCD Image Disappearance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) panels struggle to quickly discharge grayscale data voltage when turned off, leading to slow image disappearance due to slow voltage discharge to ground voltage.
Innovation Solution
A method and apparatus that generate specific gate off voltages based on an external voltage or gate on voltage to quickly discharge the voltage in the display panel, utilizing a second gate off voltage equal to the gate on voltage and a first gate off voltage generated from the second, ensuring rapid image disappearance by turning on the thin film transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display apparatus is turned off, then power consumption is reduced, but the grayscale data voltage discharges slowly causing the image to disappear slowly
Solution Approach 1:
The gate off voltage is dynamically adjusted based on the operating mode. In the first operating mode (display on), the gate off voltage is at a first level, while in the second operating mode (display off), the gate off voltage transitions to a second level that is higher than the first level. This dynamic adjustment enables fast discharge of grayscale data voltage when the display is turned off, solving the contradiction between power saving and fast image disappearance.
Solution Approach 2:
The patent changes the voltage parameter of the gate off voltage based on the operating mode. By switching between different voltage levels for the gate off signal, the system achieves both power consumption reduction and fast voltage discharge when needed, resolving the technical contradiction between energy saving and discharge speed.
2Device complexity
If a conventional gate off voltage is used, then the circuit design is simple, but the image disappearance is slow affecting display quality
Solution Approach 1:
The gate driver dynamically switches between different gate off voltage levels based on the operating mode signal. This dynamic approach maintains relatively simple circuit architecture while achieving fast image disappearance and improved display quality, as the circuit adapts its behavior rather than requiring completely separate circuits for different functions.
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 enables quick discharge of the grayscale data voltage, allowing images on the LCD panel to disappear rapidly when the display is turned off, improving display quality by ensuring swift voltage discharge.
Implementation Method 1
The TFT transmits a grayscale data voltage to the pixel electrode in response to a gate signal when the LCD apparatus is turned on
Implementation Method 2
By adjusting an intensity of the electric field, via a corresponding adjustment of the voltage, a transmittance of light passing through the liquid crystal layer may be adjusted
Data Source
AI summary
A method of driving a display panel includes generating a gate on voltage, generating first and second gate off voltages based on an external voltage in a first operating mode, and first and second gate off voltages based on the gate on voltage in a second operating mode, generating a clock signal based on the gate on voltage and the second gate off voltage and outputting a gate voltage generated based on the clock signal and the first and second gate off voltages to a gate line of the display panel.