LCD Driving Circuit Thermal Sensor Clock Pulse Width Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional LCD devices face challenges with 'cold-start' issues due to the decrease in conducting current of thin film transistor switches at low temperatures, requiring increased gate voltage which leads to extra power consumption.
Innovation Solution
A driving circuit with a thermal sensor to detect operational temperature and a power IC that adjusts clock signal pulse widths to improve TFT switch turn-on time, using a thermal sensor and power IC to generate clock signals with varying effective pulse widths based on temperature, enhancing TFT switch operation in low-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gate voltage VGH is increased to increase conducting current ION in low-temperature environment, then turn-on speed of TFT switch is improved, but power consumption increases
Solution Approach 1:
The patent changes the pulse width parameter of clock signals based on temperature conditions. At low temperatures, the pulse width is extended to allow sufficient turn-on time for TFT switches without needing to increase voltage, thus improving turn-on speed while avoiding excessive power consumption.
Solution Approach 2:
The patent implements dynamic adjustment of clock signal characteristics based on real-time temperature sensing. The system adapts the pulse width dynamically according to operating conditions, optimizing TFT switch performance across different temperature environments without fixed voltage increases.
2Reliability
If gate voltage VGH is increased to compensate for decreased conducting current at low temperatures, then reliability of TFT switch operation is improved, but power consumption increases
Solution Approach 1:
The patent modifies the temporal parameter (pulse width) rather than voltage parameter to ensure reliable TFT switch operation at low temperatures. By extending the pulse width, the system maintains adequate charge transfer and switch activation without the power penalty associated with voltage increases.
Solution Approach 2:
The patent ensures continuous and reliable TFT switch operation across temperature variations by maintaining adequate pulse widths that guarantee sufficient charge transfer. This continuous effective action maintains reliability without intermittent high-voltage corrections that would increase power consumption.
3Reliability
If pulse width of clock signals is increased to improve TFT switch turn-on at low temperatures, then cold-start performance is improved, but power consumption increases
Solution Approach 1:
The patent selectively adjusts the pulse width parameter based on temperature conditions to improve cold-start performance. At low temperatures, extended pulse widths ensure adequate charge transfer for reliable TFT switch turn-on, while at normal temperatures, standard pulse widths are used to avoid unnecessary power consumption.
Solution Approach 2:
The patent implements dynamic pulse width modulation based on real-time temperature sensing. The system automatically adapts clock signal characteristics to match operating conditions, providing enhanced pulse widths only when cold-start conditions are detected, thereby improving reliability without continuous power overhead.
4Device complexity
If standard clock signal pulse width is used at all temperatures, then device complexity is reduced, but TFT switch performance deteriorates at low temperatures
Solution Approach 1:
The patent incorporates temperature sensing feedback to automatically adjust clock signal pulse widths. The thermal sensor provides real-time temperature information that feeds back to the signal generation circuit, enabling automatic adaptation of pulse widths to maintain optimal TFT switch performance across different operating conditions.
Solution Approach 2:
The patent transforms the static clock signal into a dynamic one that adapts to temperature conditions. By making the pulse width variable based on thermal conditions, the system maintains high TFT switch turn-on speed at low temperatures without requiring complex manual intervention or fixed high-voltage designs.
Data Source
AI summary
A driving circuit of an LCD device and related driving method is provided. The driving circuit includes a thermal sensor and a power IC. The thermal sensor is configured to detect the operational temperature of the LCD device, thereby generating a corresponding thermal signal. The power IC is configured to provide a plurality of clock signals for driving a gate driver of the LCD device, and adjust the effective pulse widths of the plurality of clock signals according to the thermal signal.