Pixel Block Reference Voltage Control for Motion-Blur Display Driving
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Solution Overview
Problem
Display devices experience motion blur and luminance inconsistencies due to changes in driving transistor characteristics, particularly as resolution and frequency increase, which affect the quality of video display.
Innovation Solution
A display device that supplies a reference voltage and image data voltage differently across pixel rows in units of pixel blocks, incorporating black image insertion to minimize luminance differences and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display resolution and driving frequency are increased, then display quality is improved, but motion blur is recognized
Solution Approach 1:
The patent applies periodic action by inserting black images between video frames at regular intervals. This periodic insertion of black frames creates a temporal pattern that reduces motion blur perception while maintaining the high resolution and driving frequency needed for quality display. The black image insertion occurs at specific time points between frame periods, creating a rhythmic display pattern that mitigates motion artifacts.
2Object-affected harmful factors
If black image insertion is performed to reduce motion blur, then motion blur is reduced, but luminance inconsistency occurs across pixel rows
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different pixel rows. Specifically, even-numbered pixel rows receive black image data during the black image insertion period, while odd-numbered pixel rows receive video image data. This localized differentiation compensates for the luminance reduction caused by black image insertion in certain rows, thereby maintaining overall luminance consistency across the display while still achieving motion blur reduction.
3Device complexity
If reference voltage is supplied uniformly to all pixels, then circuit simplicity is maintained, but luminance differences occur due to driving transistor characteristic changes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reference voltage supplied to pixels based on their row position and the current display period. During black image insertion periods, the reference voltage for even-numbered rows is modified to compensate for the luminance reduction from black image display. This parameter adjustment allows the circuit to maintain luminance consistency without requiring completely different circuit architectures for different pixel rows.
Data Source
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AI summary
A display device includes: a plurality of pixel blocks each including a plurality of pixels; a scan driver supplying a scan signal to the scan lines and to supply a control signal to the control lines; a data driver supplying an image data voltage or a low grayscale data voltage to the data lines; and a power supply supplying a reference voltage to the pixels, wherein the pixels are configured to receive the image data voltage during a first scan period of a frame, and to receive the low grayscale data voltage during a second scan period of the frame, and the reference voltage supplied to a first pixel row of at least one of the pixel blocks in the first scan period is different from the reference voltage supplied to a last pixel row of at least one of the pixel blocks in the first scan period.