Display Driving Method Reducing Vertical Resolution Aliasing
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Solution Overview
Problem
The use of gate-doubling driving in display devices leads to reduced vertical resolution, resulting in aliasing effects and degraded image quality, particularly noticeable in edges with curved or oblique lines, which appear rough and sawtooth-like, and also causes side visibility issues with moving vertical lines.
Innovation Solution
A driving method that reduces vertical resolution by 1/k (where k is a natural number) of input image data, processes the data to generate output image data, and applies gate-on voltage pulses to k adjacent gate lines, shifting output image data for some pixel rows by at least one pixel in alternating frames to improve image smoothness and suppress resolution degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gate-doubling driving is used to increase frame rate and reduce crosstalk, then response speed is improved and crosstalk is reduced, but vertical resolution is degraded causing aliasing effects
Solution Approach 1:
The patent applies temporal dimension by displaying the same image data multiple times within a single frame period through gate-doubling driving. Instead of reducing spatial resolution, it uses time multiplication to compensate for the reduced vertical resolution, effectively trading temporal redundancy for spatial fidelity.
Solution Approach 2:
The patent employs periodic display of image data where each frame is displayed multiple times (gate-doubling) within a frame period. This periodic repetition allows the pixel to accumulate sufficient charge while maintaining the perception of high resolution through temporal averaging, resolving the contradiction between fast response and resolution.
2Productivity
If gate-doubling driving is used to improve frame rate, then productivity is improved, but image quality is degraded due to aliasing effects
Solution Approach 1:
The patent creates temporal copies of the same image data by displaying it multiple times within a frame period through gate-doubling driving. These repeated copies allow the pixel to integrate charge over multiple periods, effectively averaging out the aliasing effects and maintaining image quality while achieving high frame rates.
Solution Approach 2:
The patent performs preliminary charge accumulation by displaying the image data multiple times before the frame period ends. This preliminary action ensures that each pixel receives sufficient charge to maintain brightness and resolution, preventing degradation despite the reduced vertical resolution from gate-doubling.
3Ease of operation
If vertical resolution is reduced by gate-doubling driving, then ease of operation is improved for 3D display, but image smoothness is degraded with sawtooth patterns
Solution Approach 1:
The patent uses periodic display of the same image data multiple times within a frame period to create temporal averaging. This periodic repetition smooths out the sawtooth patterns and aliasing effects by distributing the discrete vertical lines across multiple time periods, making them imperceptible to the human eye while maintaining 3D display capability.
Solution Approach 2:
The patent creates a temporal vibration effect by rapidly displaying the same image data multiple times within a frame period. This high-frequency temporal variation causes the human visual system to perceive a smoothed, continuous image rather than discrete sawtooth patterns, effectively masking the resolution reduction.
Data Source
AI summary
A driving method of a display device includes: generating output image data by the signal controller by either reducing vertical resolution of input image data of one frame by 1/k (k is a natural number) or receiving input image data with its vertical resolution reduced by 1/k and processing the input image data to generate output image data; generating a data voltage based on the output image data by the data driver to apply the data voltage to the data line; and applying gate-on voltage pulses to k adjacent gate lines by the gate driver corresponding to respective image data of the output image data, wherein the output image data corresponding to some pixel rows of the output image data are shifted to left or right by at least one pixel and are output to the data driver in a first frame.