Display Device Analog-to-Digital Converter Clock Control
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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 a clock to prevent sensing value extraction from overlapping with 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 and measurement precision deteriorates due to overlapping with black image insertion
Solution Approach 1:
The sensing period is divided into multiple sub-periods: a first sub-period for black image insertion and a second sub-period for sensing value extraction. By segmenting the sensing period into distinct time windows, the patent prevents overlap between black image insertion and sensing operations, thereby eliminating signal noise while maintaining sensing productivity.
2Reliability
If black image insertion is performed to reduce motion blur, then image quality is improved, but sensing accuracy deteriorates due to signal noise from overlapping periods
Solution Approach 1:
The patent segments the frame period into distinct intervals: a black image insertion period for improving image quality and a separate sensing value extraction period for maintaining sensing accuracy. This temporal segmentation ensures that both functions can coexist without interference.
Solution Approach 2:
The patent performs preliminary scheduling of the sensing operation timing before black image insertion occurs. By predetermined the sensing period to exclude the black image insertion interval, the system proactively prevents signal noise contamination while maintaining both image quality and sensing accuracy.
3Device complexity
If sensing period overlaps with black image insertion period, then device complexity is reduced, but signal noise increases leading to harmful factors
Solution Approach 1:
The control circuit predetermined schedules the sensing operation timing to exclude the black image insertion interval. This preliminary timing arrangement prevents signal noise generation without requiring complex real-time detection or adjustment mechanisms, thereby maintaining low device complexity while eliminating harmful signal noise.
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.