Temperature Sensing Transistor for Display Panel Compensation
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Solution Overview
Problem
Display panels face challenges in maintaining consistent display effects across varying temperatures due to changes in liquid crystal and OLED operation stability and thin film transistor electrical characteristics, necessitating improved temperature compensation.
Innovation Solution
A device and method for temperature detection and compensation in display panels, incorporating a first inverter, delay assembly, switching transistor, capacitor, and temperature sensing transistor, which generates a variable output signal proportional to temperature, filtered and converted into a temperature code to adjust drive voltage and compensate for temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature compensation is implemented to maintain display effect consistency, then display stability improves, but device complexity increases
Solution Approach 1:
The patent merges the temperature detection function with the existing thin film transistor structure by using the TFT itself as the temperature sensing element. The temperature sensing transistor is integrated into the pixel circuit, eliminating the need for separate detection devices and reducing overall system complexity while maintaining compensation effectiveness.
Solution Approach 2:
The thin film transistor serves multiple functions: it acts as both the display control transistor and the temperature sensing element. By applying sub-threshold bias voltage to the control electrode, the same TFT structure performs temperature detection, eliminating the need for dedicated temperature sensing components and reducing device complexity.
2Measurement precision
If external temperature detection devices are used, then temperature measurement accuracy improves, but device integration and response speed deteriorate
Solution Approach 1:
The display panel's thin film transistor structure performs self-temperature detection by utilizing its own electrical characteristics (sub-threshold bias voltage and channel current) as temperature indicators. This self-service approach eliminates the need for external sensing devices, enabling rapid local temperature response directly at the pixel level without delays from external signal transmission.
3Measurement precision
If sub-threshold bias voltage is applied to temperature sensing transistor, then temperature sensitivity improves, but current consumption increases
Solution Approach 1:
The patent applies partial action by using sub-threshold bias voltage (below the normal threshold voltage VT) to operate the temperature sensing transistor in a weak inversion region. This partial activation state provides sufficient temperature sensitivity while consuming significantly less power than full inversion operation, achieving a balance between measurement precision and energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate and rapid temperature detection and compensation within the display panel, improving stability and consistency of display effects across different temperature conditions without the need for external temperature detection devices.
Implementation Method 1
a temperature sensing transistor, including a control electrode applied with a sub-threshold bias voltage, a first electrode coupled to the input terminal of the first inverter and a second electrode is grounded to be coupled to a second voltage signal terminal, and configured so that a channel current of the temperature sensing transistor is proportional to a temperature at the sub-threshold bias voltage
Data Source
AI summary
A device and method for temperature detection, a device and method for compensating for temperature of display panel, and a display device are disclosed. The device for temperature detection includes: a first inverter, inverting a voltage signal at an input terminal thereof to output an inverted signal; a delay assembly, delaying the inverted signal and outputting a delayed inverted signal as an output signal; a switching transistor, applying a first voltage signal to the input terminal of the first inverter from a first voltage signal terminal based on the output signal; a first capacitor, including a first terminal coupled to a first electrode of the switching transistor and a second terminal coupled to the input terminal of the first inverter; and a temperature sensing transistor, configured so that a channel current of the temperature sensing transistor is proportional to a temperature at the sub-threshold bias voltage.