Display Device Gate Signal Modulation for Flicker Reduction
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Solution Overview
Problem
As display panel size and resolution increase, image quality deterioration occurs due to kick back phenomena and reduced slew rates in gate signals, leading to flicker, afterimages, and luminance imbalance, which existing methods fail to adequately address across different panel positions.
Innovation Solution
A data processing device selectively applies image quality improvement functions to gate driving integrated circuits (ICs) based on positional characteristics, using a clock generating circuit and control signal generating circuit to activate and deactivate image quality improving circuits in different time sections, applying gate pulse modulation and voltage adjustments to specific gate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the size and resolution of the display panel are increased, then the display capability is improved, but the slew rate of the gate signal is reduced
Solution Approach 1:
The patent applies gate pulse modulation (GPM) that modifies the slope of the falling edge of the gate signal, and applies overdrive voltage or underdrive voltage to the basic gate signal voltage. These parameter changes compensate for the reduced slew rate caused by larger display panel size, thereby maintaining adequate signal transition speed despite the increased panel area
2Manufacturing precision
If gate pulse modulation and voltage adjustments are applied to multiple gate driving ICs simultaneously, then image quality improvement is achieved, but the image quality deterioration cannot be sufficiently prevented due to positional differences
Solution Approach 1:
The patent selectively applies the image quality improvement function to specific gate driving ICs based on their positional characteristics on the display panel. Different gate driving ICs may have different operational states (activated or deactivated) depending on whether their corresponding panel positions experience image quality deterioration, thereby providing localized adaptation to positional variations
3Area of stationary object
If the number of gate driving ICs is increased to cover larger display panels, then the coverage area is improved, but the complexity of controlling image quality across different positions increases
Solution Approach 1:
The patent divides the display panel into multiple regions covered by different gate driving ICs, and applies the image quality improvement function selectively to specific segments (gate driving ICs) based on their positional characteristics. This segmentation allows independent control of each IC's image quality function, simplifying the overall control complexity while maintaining large coverage area
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 effectively improves image quality by selectively addressing deterioration across different panel positions, preventing flicker and luminance imbalances by modifying pulse waveforms and slew rates of gate signals.
Implementation Method 1
a clock generating circuit configured to generate a gate clock signal and to transmit the same to a first gate driving integrated circuit (IC) and a second gate driving IC
Implementation Method 2
a first control signal generating circuit configured to generate an operation control signal, which activates only a first image quality improving circuit included in the first gate driving IC during a first time section
Implementation Method 3
an image quality improving circuit configured to improve an image quality which has deteriorated due to the gate signal by modifying a pulse waveform of the gate signal
Implementation Method 4
applying one or more of an overdrive voltage and an underdrive voltage to the basic voltage of the gate signal
Implementation Method 5
Each pixel includes a transistor, which is turned on by a gate signal supplied to a gate line. When the transistor is turned on, the data line is connected to the pixel so that a data voltage is supplied to the pixel
Implementation Method 6
the gate signal may be affected by a kick back voltage due to a parasitic capacitance between the gate line and a gate node of the transistor
Data Source
AI summary
The present embodiment relates to a data processing device and a display device and, more specifically, to data processing device and a display device for selectively applying an image quality improvement function in consideration of the characteristics depending on the positions on a display panel.