Temperature Sensing Circuit for LCD Panel Driving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing temperature sensing circuits for liquid crystal display (LCD) panels require multiple temperature sensors and complex circuit architectures, leading to increased costs and power consumption, making them unsuitable for narrow-frame displays and inefficient in maintaining image quality across varying ambient temperatures.
Innovation Solution
A temperature sensing circuit integrated into the gate-on-array (GOA) structure, comprising a switching circuit, charging circuit, judging circuit, selector, level shifter, and gate driver, which adjusts driving signals based on ambient temperature to maintain image quality by using a-Si TFTs, reducing the need for multiple sensors and complex circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temperature sensors and complex circuit architectures are used, then temperature sensing accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the temperature sensing function with the existing gate driver circuit by utilizing the a-Si TFT characteristics and integrating sensing transistors within the GOA structure. This merging eliminates the need for separate temperature sensors and complex external circuitry, achieving temperature detection while reducing device complexity and cost.
Solution Approach 2:
The gate driver circuit is designed to perform multiple functions: driving the display panel and sensing temperature simultaneously. By making the circuit universal, the patent avoids adding dedicated temperature sensing components, thereby reducing overall system complexity while maintaining sensing accuracy.
2Measurement precision
If multiple temperature sensors and complex circuits are deployed, then temperature detection capability is improved, but power consumption increases
Solution Approach 1:
The temperature sensing operation is merged with the normal gate driver operation, allowing temperature detection to occur during existing circuit activity rather than requiring separate powered sensing operations. This reduces additional power consumption while maintaining detection capability.
Solution Approach 2:
The temperature sensing is implemented periodically within the gate driver's operating cycle, utilizing existing switching periods to perform sensing measurements. This periodic approach avoids continuous power consumption while maintaining adequate temperature monitoring capability.
3Measurement precision
If a large layout area is allocated for temperature sensing circuits, then sensing precision is improved, but the display frame width increases
Solution Approach 1:
The temperature sensing transistors are merged into the existing gate driver array structure, utilizing the same layout space already allocated for driving functions. This integration achieves temperature sensing without requiring additional layout area that would increase frame width.
Solution Approach 2:
The temperature sensing circuit elements are nested within the gate driver circuit structure, placing sensing transistors and components inside or alongside the driving circuit elements. This nesting approach maximizes space utilization and avoids increasing the overall display area.
Data Source
AI summary
The present invention provides a temperature sensing circuit, which comprises a switching circuit, a charging circuit, and a judging circuit. The switching circuit receives a supply voltage for generating a switching signal. The charging circuit is coupled to the switching circuit and receives the supply voltage. The switching signal controls the charging circuit for generating a voltage signal according to the supply voltage. The judging circuit is coupled to the charging circuit for generating a judging signal according to the level of the voltage signal. The levels of the switching signal and the voltage signal are related to a temperature state; and the judging signal represents the temperature state. The temperature sensing circuit can be applied to the driving circuit of a display panel for detecting the temperature state. Hence, the level of the driving signal of the driving circuit can be adjusted for improving the image quality.