Shift Register Circuit for Narrow Frame Display with Integrated Photodiodes
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Solution Overview
Problem
Existing display devices with integrated photosensors face challenges in providing a narrower frame due to separate scanning line drive circuits for pixels and photosensors, which complicates their design and functionality.
Innovation Solution
A display device with photodiodes integrated into the display panel, utilizing a shift register circuit and switching circuit to manage both display and detection periods in a time division manner, allowing for shared scanning line drive circuits that reduce the frame width by coordinating gate drive signals and sensor control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate scanning line drive circuits are provided for pixels and photosensors, then display and detection functions can be independently controlled, but the frame width increases and design complexity increases
Solution Approach 1:
The patent merges the scanning line drive circuits for pixels and photosensors into a single shared circuit. The control circuit generates control signals that enable the same scanning line drive circuit to sequentially perform both display scanning and detection scanning functions, thereby reducing frame width while maintaining independent control capability through time-division multiplexing.
Solution Approach 2:
The scanning line drive circuit is designed with multi-functionality to serve both display pixels and detection photosensors. By configuring the circuit to respond to different control signals (first control signal for display, second control signal for detection), a single circuit performs multiple functions that previously required separate dedicated circuits.
2Adaptability or versatility
If separate scanning line drive circuits are provided for pixels and photosensors, then display and detection operations can be independently optimized, but device complexity increases
Solution Approach 1:
The patent combines multiple drive circuits into one shared scanning line drive circuit. The control circuit coordinates the shared circuit to handle both display and detection operations through different control signals, reducing the total number of circuits and simplifying the overall device configuration while preserving operational independence.
Solution Approach 2:
The control circuit employs periodic action by generating control signals that alternately activate the shared scanning line drive circuit for display operations and detection operations. This time-division approach allows independent optimization of both functions while using a single circuit, thereby reducing device complexity.
3Adaptability or versatility
If photodiodes are integrated into display pixels, then detection function is added, but separate drive circuits are needed increasing frame width
Solution Approach 1:
The patent merges the drive circuits for display pixels and integrated photodiodes into a single shared scanning line drive circuit. The control circuit generates distinct control signals that enable the same circuit to drive both pixels for display and photodiodes for detection, thereby adding detection functionality without increasing frame width.
Solution Approach 2:
The patent applies dynamics by making the scanning line drive circuit adaptable and reconfigurable through different control signals. The circuit dynamically switches between display driving mode and detection driving mode, allowing integrated photodiodes to function without requiring permanently dedicated circuitry that would increase frame width.
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 configuration enables a display device with a narrower frame by efficiently managing display and detection operations, allowing for integrated photodiodes to function within the display panel without the need for separate drive circuits, thus enhancing design efficiency and functionality.
Implementation Method 1
a plurality of photodiodes provided in two or more of the pixels, respectively
Data Source
AI summary
A display device includes: pixels arranged in a display region; photodiodes provided in two or more of the pixels, respectively; a shift register circuit configured to sequentially output an output signal to the pixels and the photodiodes; a switching circuit configured to switch coupling between the shift register circuit and the pixels, and coupling between the shift register circuit and the photodiodes; and a control circuit configured to control a display period for display by the pixels and a detection period for detection by the photodiodes in a time division manner. The control circuit is configured to sequentially output a gate drive signal to the pixels by an operation of the shift register circuit and the switching circuit in the display period, and sequentially output a sensor control signal to the photodiodes by an operation of the shift register circuit and the switching circuit in the detection period.