Display Shift Register Voltage Adjustment for Low Temperature Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices with shift register built-in systems face issues with proper gate signal supply at low temperatures due to decreased ON current in transistors, leading to inadequate operation of the shift register circuit.
Innovation Solution
A control circuit for display devices that includes a shift register circuit, a temperature information acquisition unit, and a voltage switching unit, which adjusts the voltage amplitude of the Low voltage line and/or High voltage line based on acquired temperature information to ensure proper gate signal supply, using threshold temperatures and shift voltages to optimize voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a shift register circuit is formed on the same substrate with TFTs in a conventional liquid crystal display device, then the device structure is simplified and manufacturing is easier, but the transistor ON current decreases at low temperatures causing improper gate signal supply
Solution Approach 1:
The patent changes the voltage parameters of the gate control signal based on temperature. A voltage switching unit adjusts the voltage amplitude of the gate control signal supplied to the shift register circuit according to temperature information from a temperature information acquisition unit, ensuring proper transistor operation at low temperatures while maintaining normal operation at higher temperatures
Solution Approach 2:
The patent introduces dynamic voltage adjustment capability to the gate control signal. The voltage switching unit dynamically changes the voltage amplitude of the gate control signal based on real-time temperature information, making the system adaptable to varying temperature conditions rather than using a fixed voltage level
2Reliability
If the voltage amplitude of gate control signal is increased to maintain transistor operation at low temperatures, then transistor ON current becomes sufficient, but energy consumption increases
Solution Approach 1:
The voltage switching unit dynamically adjusts the voltage amplitude based on temperature conditions, applying high voltage only when necessary (at low temperatures) and using normal voltage at higher temperatures, thus maintaining reliability while minimizing energy consumption
Solution Approach 2:
The patent changes the voltage parameter of the gate control signal conditionally based on temperature. The voltage switching unit modifies the voltage amplitude only when temperature information indicates low temperature conditions, otherwise maintaining normal operating voltage to conserve energy
Data Source
AI summary
A control circuit for a display device includes a shift register circuit which includes at least one transistor and outputs a gate signal in response to at least one voltage signal, a temperature information acquisition unit configured to acquire temperature information at the control circuit for a display device, and a voltage switching unit configured to switch a voltage of the at least one voltage signal based on the acquired temperature information.