Display Module Flyback Temperature Measurement for Noise Reduction
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Solution Overview
Problem
Existing techniques for temperature detection in liquid crystal panels face challenges due to long distances between temperature detection elements and A/D converters, leading to fluctuations in forward voltage and inaccurate temperature data acquisition, especially under noise disturbances.
Innovation Solution
A display module configuration with a driving circuit and measurement circuit on a wiring board that measures temperature based on an output signal from a temperature detection element during flyback periods, reducing noise interference by shortening the distance between the detection element and the A/D converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature detection element and A/D converter are electrically coupled via a flexible wiring board with a long distance, then the structure can be flexible and easy to assemble, but the forward voltage of the diode fluctuates under the influence of disturbance noise
Solution Approach 1:
The patent integrates the A/D converter into the driving circuit IC that is mounted on the same substrate as the temperature detection element, eliminating the need for long flexible wiring boards. This merging of components reduces the signal transmission distance and minimizes noise interference while maintaining ease of assembly through integrated circuit design
Solution Approach 2:
The patent introduces a dedicated measurement circuit within the driving circuit IC that serves as an intermediary between the temperature detection element and the A/D converter. This intermediary circuit is specifically designed to measure temperature during flyback periods when power supply noise is minimal, thereby protecting the measurement signal from noise contamination
2Device complexity
If the A/D converter is disposed on the circuit board far from the temperature detection element, then the driving circuit can be simplified, but the forward voltage fluctuates due to power supply noise generated during signal transmission
Solution Approach 1:
The patent combines the A/D converter and measurement circuit into the driving circuit IC that is mounted on the same substrate as the temperature detection element. This integration simplifies the overall system architecture by eliminating separate circuit boards and wiring boards, while simultaneously improving measurement precision by reducing noise exposure
Solution Approach 2:
The patent performs temperature measurement during flyback periods when the liquid crystal panel is not actively displaying images. This preliminary action during idle periods avoids interference from power supply noise generated during active signal transmission, ensuring accurate temperature data acquisition
3Productivity
If temperature measurement is performed during active signal transmission periods, then real-time temperature monitoring is achieved, but power supply noise generated during signal transmission causes forward voltage fluctuation
Solution Approach 1:
The patent implements periodic temperature measurement during flyback periods when the liquid crystal panel is not actively displaying images. This periodic measurement approach alternates between image display and temperature measurement phases, ensuring accurate temperature data acquisition while maintaining real-time monitoring capability through continuous periodic sampling
Solution Approach 2:
The patent performs temperature measurement during flyback periods that occur after active signal transmission has completed. This preliminary action before the next display period ensures that temperature is measured when power supply noise is minimal, while still maintaining real-time monitoring through continuous periodic measurement
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
Improves temperature measurement accuracy by minimizing the impact of disturbance and power supply noise on the forward voltage, ensuring precise temperature data acquisition.
Implementation Method 1
an electro-optical device that includes a temperature detection element and is configured to display an image
Implementation Method 2
the driving circuit includes a measurement circuit configured to measure a temperature of the electro-optical device based on an output signal from the temperature detection element
Data Source
AI summary
A display module includes an electro-optical device that includes a temperature detection element and is configured to display an image, a wiring board that includes a driving circuit configured to drive the electro-optical device, and a circuit board that includes a first control circuit configured to control the driving circuit and is electrically coupled to the electro-optical device via the wiring board. The driving circuit includes a measurement circuit configured to measure a temperature of the electro-optical device based on an output signal from the temperature detection element in a flyback period of the electro-optical device.