Display Dithering Voltage Timing for Flicker Reduction
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Solution Overview
Problem
Display devices experience luminance deviation and flicker due to dithering operations performed at certain frequencies, which affect display quality.
Innovation Solution
The display device alternately applies dithering data voltage in units of one frame at specific frequencies and in units of N frames at other frequencies, reducing flicker by adjusting dithering frequencies and voltages to minimize luminance deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dithering operation is performed at intermediate dithering frequency (second dithering frequency), then display quality is improved, but flicker occurs due to luminance deviation
Solution Approach 1:
The patent applies periodic action by alternately changing dithering data voltage in units of N frames at intermediate dithering frequencies. This periodic modulation of the dithering signal reduces the flicker effect while maintaining display quality, as the alternating pattern creates a more stable perceived luminance over time.
Solution Approach 2:
The patent changes the parameter of dithering voltage application units from 1 frame to N frames at intermediate dithering frequencies. This parameter adjustment modifies how dithering data voltage is applied, reducing luminance deviation and flicker while preserving the benefits of dithering operation for display quality.
2Object-affected harmful factors
If dithering operation is performed at high dithering frequency (first dithering frequency), then flicker is reduced, but data driver cost increases due to higher bit processing capability requirements
Solution Approach 1:
The patent changes the operating parameters of the dithering operation to use intermediate frequencies with N-frame alternating voltage application. This allows cost-effective data drivers with lower bit processing capability to achieve acceptable display quality without the high costs associated with high-frequency dithering operations.
3Ease of manufacture
If dithering operation is performed at low dithering frequency (third dithering frequency), then data driver cost is reduced, but flicker increases due to luminance deviation
Solution Approach 1:
The patent applies periodic action by implementing alternating dithering data voltage in units of N frames. This periodic modulation enhances the effectiveness of low-frequency dithering operations, reducing flicker and luminance deviation while maintaining cost advantages of lower frequency operation.
Data Source
AI summary
A display device includes a display panel including pixels, a data driver which applies a dithering data voltage to the display panel, and a driving controller which determines whether to perform a dithering operation of applying the dithering data voltage to the display panel based on input image data. The display device alternately changes the dithering data voltage in units of one frame when the dithering operation is performed at a first dithering frequency or a third dithering frequency, and alternately changes the dithering data voltage in units of N frames when the dithering operation is performed at a second dithering frequency.