Display Data Driver Signal Noise Reduction via Paused Sensing Clocks
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Solution Overview
Problem
Display devices face challenges in reducing motion blur and accurately detecting changes in transistor characteristics due to overlapping sensing periods with black image insertion, leading to signal noise and inaccurate characterization.
Innovation Solution
A display device design that controls the output of sensing clocks to prevent overlap between sensing value extraction and black image insertion periods, using a clock generator and analog-to-digital converter to pause and re-output sensing clocks based on pause signals, ensuring accurate detection of transistor characteristics without noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensing operation is performed continuously during the sensing period, then sensing speed and productivity are improved, but signal noise increases due to overlap with black image insertion
Solution Approach 1:
The sensing clock output is controlled to pause during a first period and re-output during a second period within the sensing period. This periodic pause aligns with the black image insertion timing, preventing overlap between sensing operations and black image display, thereby eliminating signal noise while maintaining sensing productivity.
2Reliability
If black image insertion is used to reduce motion blur, then image quality is improved, but sensing accuracy deteriorates due to signal noise from overlapping periods
Solution Approach 1:
The sensing period is divided into a first period and a second period. The first period corresponds to the black image insertion period where sensing clock output is paused, and the second period is where sensing operations are performed. This segmentation isolates sensing operations from black image insertion, ensuring accurate transistor characteristic measurement while maintaining motion blur reduction benefits.
3Object-affected harmful factors
If sensing clock output is paused during first period, then signal noise is reduced, but sensing time increases
Solution Approach 1:
The sensing clock output timing is dynamically adjusted based on the black image insertion schedule. The clock generator pauses sensing clock output during the first period (black image insertion) and resumes during the second period, optimizing the sensing operation timing to eliminate noise without requiring additional sensing time beyond the original sensing period.
Data Source
AI summary
A display device includes a display unit, a scan driver, and a data driver. The display unit includes pixels coupled to scan lines, sensing scan lines, data lines, and sensing lines. The scan driver supplies a scan signal to the scan lines, and supplies a sensing scan signal to the sensing scan lines. The data driver supplies an image data voltage to the data lines, and detects sensing values of the pixels on a pixel column basis through the sensing lines during a sensing period. The data driver includes an analog-to-digital converter which converts the detected sensing values into digital data during the sensing period and outputs sensing data. The analog-to-digital converter pauses the detection of the sensing values during a first period of the sensing period.