Driving Circuit Regional Gate Voltage Compensation for Display Uniformity
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Solution Overview
Problem
LCD displays experience unevenness in grayscale luminance and flicker degree across different regions due to variations in Thin Film Transistor (TFT) properties, leading to inconsistent display performance.
Innovation Solution
A driving circuit and method that divides the display panel into regions and adjusts gate voltages accordingly to compensate for these variations, ensuring uniformity by inputting different gate voltages to different regions and the same gate voltage to the same region, with optional data voltage adjustments to maintain consistent grayscale luminance and flicker degree.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same gate voltage is input to all pixel cells in each row, then the gate driving operation is simple, but the display uniformity deteriorates due to TFT property variations in different regions
Solution Approach 1:
The display panel is divided into multiple regions along the gate scanning direction, with each region assigned a specific gate voltage value. This segmentation allows different regions to receive customized gate voltages that compensate for TFT property variations, thereby improving display uniformity while maintaining manageable control complexity through regional grouping
Solution Approach 2:
Different gate voltage values are applied to different regions of the display panel according to the specific TFT properties in each region. This local quality approach ensures that each region receives the appropriate gate voltage compensation needed to achieve uniform display performance across the entire panel
2Manufacturing precision
If different gate voltages are input to pixel cells in different regions, then the display uniformity is improved, but the gate driving complexity increases
Solution Approach 1:
The display panel is divided into a limited number of regions (typically 3-10 regions) along the gate scanning direction, where each region is assigned a uniform gate voltage value. This segmentation strategy balances the need for regional compensation with the desire to keep the control system manageable, avoiding the complexity of individually controlling each pixel cell
Solution Approach 2:
The gate voltage parameter is varied across different regions to compensate for TFT property variations. By changing the gate voltage parameter regionally rather than individually for each pixel, the system achieves improved display uniformity while maintaining reasonable driving complexity
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
This approach alleviates unevenness in display cells by generating compensation for different regions, resulting in improved uniformity of grayscale luminance and flicker degree across the display panel.
Implementation Method 1
the gate driving unit inputs a high level to gates of Thin Film Transistors (referred to as TFTs for short) of the pixel cells to thereby turn on the TFTs, and TFTs will be turned off when the gate driving unit inputs a low level to gates of the TFTs
Implementation Method 2
the data driving unit will write a data voltage to the pixel cells in the corresponding row, so that a voltage of the pixel cells is charged to a pixel voltage required to display an image
Implementation Method 3
liquid crystal molecules of the pixel cells deflect by the action of an electric field, thereby light of a backlight source travels through the pixel cells to form an image
Data Source
AI summary
Embodiments of the present application disclose a driving circuit, a driving method, and a display device, and pertain to the field of display. The driving circuit comprises: a gate driving unit for sequentially inputting a gate voltage to gates of pixel cells in each row on a display panel, the display panel being divided into a plurality of regions along a gate scanning direction, each region including at least one row of pixel cells controlled by a gate line; and a control unit for controlling the gate driving unit to input different gate voltages to gates in at least two different regions, and to input the same gate voltage to gates in the same region.