Adjustable Pulse Width Shift Register for Display Panels
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Solution Overview
Problem
Existing display devices, such as TFT-LCD and OLED displays, have fixed pulse widths for gate scan signals, which cannot be adjusted, leading to inadequate charging of pixels, especially in larger panels where signal pulse width is insufficient, affecting display performance.
Innovation Solution
A shift register unit with an input module, pull-up and pull-down control modules, and an energy storage module is introduced, allowing for adjustable pulse width by controlling voltage outputs through a series of transistors and capacitors, enabling the pulse width of the signal output to match the input signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed pulse width is used for gate scan signals in GOA circuit, then the circuit structure is simple, but the pulse width cannot be adjusted leading to insufficient charging of pixels in larger panels
Solution Approach 1:
The patent applies dynamics by making the pulse width adjustable rather than fixed. The shift register unit incorporates control modules that can dynamically change the pulse width of output signals based on different working conditions, allowing the GOA circuit to adapt to various panel sizes and requirements while maintaining a relatively simple base structure.
Solution Approach 2:
The patent changes the parameter of pulse width from a fixed value to an adjustable parameter. By introducing control modules that can modify the pulse width parameter based on external control signals or internal states, the circuit achieves adaptability without requiring complete structural redesign.
2Reliability
If the pulse width is increased to ensure effective charging of pixels in larger panels, then pixel charging is improved, but the fixed pulse width cannot be reduced for smaller panels or different applications
Solution Approach 1:
The patent makes the pulse width dynamic and adjustable, allowing it to be increased for larger panels to ensure effective pixel charging while being reducible for smaller panels or different applications. This dynamic adjustment capability resolves the contradiction between ensuring sufficient charging and maintaining application flexibility.
3Ease of manufacture
If a simple shift register structure is used, then the device is easy to manufacture, but the output signal pulse width cannot be controlled or adjusted
Solution Approach 1:
The patent segments the shift register unit into functional modules: a basic shift register part and additional control modules (first pull-up control module, second pull-up control module, pull-down control module). This segmentation allows the core shift register function to remain simple for easy manufacturing, while the added control modules provide pulse width control capability.
Solution Approach 2:
The patent incorporates control modules that prepare and control the output signal in advance. The first and second pull-up control modules and pull-down control module are designed to preemptively adjust the pulse width before the signal is output, ensuring that the desired pulse width is achieved without complicating the core shift register structure.
Data Source
AI summary
Provided are a shift register unit and a driving method thereof, a scan driving circuit, a display device, wherein the shift register unit comprises an input module configured to output a voltage at the signal input terminal to the first node, an energy storage module configured to store the voltage at the first node or to charge the first node, a first pull-up control module configured to output a voltage at the first voltage terminal to the pull-up control node, a second pull-up control module configured to output a voltage at the second voltage terminal to the pull-up control node, a pull-down control module configured to output a voltage at the first node to the pull-down control node. The pulse width of the signal of each stage of output terminal of the GOA circuit can be adjusted.