GOA Shift Register Pull-Down Unit Voltage Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display (LCD) driving circuits face challenges in maintaining voltage levels, especially under high temperature conditions, leading to abnormal outputs due to insufficient node voltages, which affects the performance of pull-down maintain units in gate on array (GOA) circuits.
Innovation Solution
Incorporating a thin film transistor device into the pull-down maintain unit of the control circuit, with a configuration of multiple stages of shift registers and switches, and a storing capacitor to effectively compensate voltage levels, ensuring stable operation even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional GOA circuit is used, then manufacturing cost is reduced and panel thickness is decreased, but voltage level maintenance capability deteriorates under high temperature conditions
Solution Approach 1:
The pull-down maintain unit is divided into multiple switches (first switch, second switch, third switch) with distinct functions. Each switch is controlled by different control signals (first control signal, second control signal, third control signal) to independently manage voltage levels at different nodes, enabling precise voltage maintenance under high temperature conditions while maintaining GOA manufacturing advantages
Solution Approach 2:
A fourth switch is introduced as an intermediary component to provide additional voltage compensation capability. This switch acts as a mediator to supply extra control over the voltage levels, ensuring stable operation under high temperature conditions without compromising the conventional GOA circuit's manufacturing benefits
2Device complexity
If conventional pull-down maintain unit is used, then device complexity is reduced, but output stability deteriorates under high temperature conditions
Solution Approach 1:
The pull-down maintain unit employs dynamic control through multiple switches that are activated by different control signals based on operating conditions. This dynamic configuration allows the circuit to adapt to high temperature conditions by selectively activating compensation paths, maintaining output stability without requiring a completely complex circuit redesign
Solution Approach 2:
The circuit utilizes parameter changes in the form of different control signals (first control signal, second control signal, third control signal) to adjust the state of various switches. By changing the electrical parameters (voltage levels, signal timing) of these control signals, the circuit maintains stable output under high temperature conditions while keeping the structural complexity manageable
Data Source
AI summary
A control circuit and a display panel applied by the control circuit are provided. The control circuit includes a plurality of stages of shift registers, wherein each of the shift registers includes a first switch, wherein a control terminal of the first switch is configured to receive a first control signal, a first terminal of the first switch is configured to receive the first control signal, and a second terminal of the first switch is electrically coupled to a first node; a second switch, wherein a control terminal of the second switch is electrically coupled to the first node, a first terminal of the second switch is configured to receive a first clock signal, and a second terminal of the second switch is configured to receive a second control signal.