Pixel Circuit Sharing Data Line for Optical Sensing
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Solution Overview
Problem
Existing display technologies face challenges in reducing the bezel region area or display panel thickness while maintaining optical detection functions, due to the difficulty in integrating light sensors and pixel circuits without increasing the number of sensing signal lines, which complicates circuit board layout.
Innovation Solution
A pixel circuit is designed with an integrated photoelectric sensing sub-circuit that shares the same data signal line and voltage terminal with the light emission control sub-circuit, allowing for the transmission of both display and sensing data signals in different time periods without the need for additional signal lines or power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light sensors and pixel circuits are integrated together to reduce bezel area or panel thickness, then the display panel can achieve narrow bezel or reduced thickness, but the number of sensing signal lines increases, making circuit board layout more difficult
Solution Approach 1:
The data signal line is designed to serve dual purposes: transmitting display data signals during the display period and transmitting sensing data signals during the sensing period. This multi-functional use of the existing data signal line eliminates the need for separate sensing signal lines, thereby reducing circuit board layout complexity while enabling light sensor integration
Solution Approach 2:
The patent merges the display function and sensing function into a single pixel circuit unit. The light sensor, photoelectric sensing sub-circuit, and light emission control sub-circuit are integrated within the same pixel circuit, sharing common signal lines and power supplies, which reduces the overall system complexity and eliminates the need for additional sensing signal lines
2Length of stationary object
If light sensors and pixel circuits are integrated together to reduce panel thickness, then the display panel can achieve reduced thickness, but the number of sensing signal lines increases, making circuit board layout more difficult
Solution Approach 1:
The data signal line is designed to serve dual purposes: transmitting display data signals during the display period and transmitting sensing data signals during the sensing period. This multi-functional use of the existing data signal line eliminates the need for separate sensing signal lines, thereby reducing circuit board layout complexity while enabling light sensor integration
Solution Approach 2:
The patent merges the display function and sensing function into a single pixel circuit unit. The light sensor, photoelectric sensing sub-circuit, and light emission control sub-circuit are integrated within the same pixel circuit, sharing common signal lines and power supplies, which reduces the overall system complexity and eliminates the need for additional sensing signal lines
3Reliability
If additional sensing signal lines are added to transmit sensing data, then optical detection function is achieved, but circuit board layout difficulty increases
Solution Approach 1:
The data signal line is designed to serve dual purposes: transmitting display data signals during the display period and transmitting sensing data signals during the sensing period. This multi-functional use of the existing data signal line eliminates the need for separate sensing signal lines, thereby reducing circuit board layout complexity while maintaining optical detection functionality
Solution Approach 2:
The patent employs periodic time-division multiplexing where the data signal line alternates between transmitting display data signals (during display period) and sensing data signals (during sensing period). This periodic switching is controlled by timing signals, allowing a single signal line to carry multiple types of data sequentially without interference, thus achieving optical detection function without increasing circuit board layout complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the complexity of circuit board layout by eliminating the need for additional signal lines and power supplies, while also enabling the integration of optical detection functions into the display panel without increasing its thickness or reducing its functionality.
Implementation Method 1
a photoelectric sensing sub-circuit, connected with the first voltage terminal and the data signal line
Data Source
AI summary
A pixel circuit, a driving method thereof, a display panel and a display apparatus are provided. The pixel circuit includes a light-emitting element, a first voltage terminal, a data signal line, a light emission control sub-circuit, and a photoelectric sensing sub-circuit. The light emission control sub-circuit is connected with the first voltage terminal, the data signal line and the light-emitting element. The photoelectric sensing sub-circuit is connected with the first voltage terminal and the data signal line.