Single-Chip Display Pixel Readout for Uniform Emission Sensing
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Solution Overview
Problem
Display devices with light-emitting devices face issues of display unevenness due to varying threshold voltages of driving transistors and require separate ICs for data driver, monitor current, and imaging data circuits, increasing manufacturing costs and complexity.
Innovation Solution
A display device with a single IC chip integrating a control circuit, data driver circuit, and read circuit, where the read circuit includes an A/D converter and comparator circuit to read monitor current and imaging data, reducing the need for separate ICs and improving voltage correction for uniform display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate ICs are provided for data driver circuit, monitor current reading circuit, and imaging data reading circuit, then each circuit can be optimized independently, but the number of ICs increases and manufacturing cost increases
Solution Approach 1:
The patent merges the data driver circuit, monitor current reading circuit, and imaging data reading circuit into a single integrated IC chip. This integration reduces the total number of ICs required in the display device while maintaining the functional independence and optimization capabilities of each circuit through dedicated circuit blocks within the unified chip architecture.
Solution Approach 2:
The integrated IC chip is designed to perform multiple functions simultaneously: driving display data output, reading monitor current for threshold voltage correction, and reading imaging data from light-receiving devices. This multi-functional design eliminates the need for separate specialized ICs while preserving circuit optimization benefits.
2Device complexity
If threshold voltage variation of driving transistor is not corrected, then device simplicity is maintained, but display unevenness occurs
Solution Approach 1:
The patent implements a feedback mechanism where the read circuit measures the actual current flowing through the driving transistor (monitor current) and uses this information to correct for threshold voltage variations. The system reads the monitor current data, compares it with expected values, and adjusts the driving parameters accordingly to compensate for transistor threshold voltage differences, thereby eliminating display unevenness.
Solution Approach 2:
The system performs preliminary reading of monitor current data before actual display operation to detect and correct threshold voltage variations in advance. This preliminary measurement and correction process ensures uniform display output from the start, preventing display unevenness before it occurs.
3Adaptability or versatility
If multiple ICs are used in the display device, then functional separation is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functionally separate circuits (data driver, monitor current reader, imaging data reader) into a single IC chip, reducing the total component count and assembly complexity. This merging approach lowers manufacturing costs by reducing the number of ICs that need to be sourced, mounted, and interconnected, while maintaining functional separation through internal circuit architecture.
Solution Approach 2:
The unified IC chip is designed with multi-functional capabilities, incorporating dedicated circuit blocks for data driving, monitor current reading, and imaging data reading. This universal design allows a single component to replace multiple specialized ICs, reducing manufacturing complexity and cost while preserving the functional advantages of circuit separation.
Data Source
AI summary
To provide an inexpensive display device. The display device includes a pixel and an IC chip. The pixel includes a first pixel circuit including a display element and a second pixel circuit including a light-receiving device. The one IC chip includes a control circuit, a data driver circuit, and a read circuit. The first and second pixel circuits are electrically connected to the read circuit. The control circuit has a function of controlling driving of the data driver circuit and the read circuit. The data driver circuit has a function of supplying image data to the first pixel circuit. The read circuit has a function of outputting a monitor signal corresponding to a monitor current when the monitor current flows through the first pixel circuit. The read circuit also has a function of outputting an imaging signal corresponding to imaging data acquired by the second pixel circuit.