Integrated Display Measurement Device for Power Current and Luminance
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Solution Overview
Problem
Existing measurement devices for display devices can only measure luminance and require additional power supply equipment, increasing complexity and cost, and do not account for voltage-current characteristics, necessitating manual operation.
Innovation Solution
A measurement device with a power supplier, switching circuit, and luminance sensing circuit that automatically measures power current and luminance by selectively connecting power and internal voltage terminals, using reed switches to minimize noise and interference, allowing concurrent measurement of multiple display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an additional power supply device is used to measure voltage-current characteristic, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the power supply function and measurement function into a single integrated device. The power supplier simultaneously provides power to the display device and measures the power current through its terminals, while the luminance sensing circuit measures luminance. This merging eliminates the need for separate power supply equipment and manual measurement devices, resolving the contradiction between measurement capability and device complexity.
Solution Approach 2:
The power supplier is designed with multi-functionality, serving both as a power source and a measurement instrument. It can provide power voltages to the display device during normal operation and automatically measure power current and luminance characteristics without requiring additional specialized equipment, thus improving adaptability while maintaining simplicity.
2Ease of operation
If manual operation is required to operate measuring device and power supply device, then measurement control flexibility is improved, but ease of operation deteriorates
Solution Approach 1:
The measurement device performs self-service by automatically measuring power current and luminance without requiring manual intervention. The power supplier automatically provides power and measures current, while the luminance sensing circuit automatically detects luminance values. The system autonomously completes the entire measurement process, eliminating the need for manual operation of separate devices.
Solution Approach 2:
The system implements automatic feedback control where the power supplier adjusts power delivery based on measured characteristics, and the measurement results are automatically processed to evaluate display device performance. This automated feedback loop eliminates manual operation while maintaining measurement flexibility and adaptability.
3Measurement precision
If only luminance measurement is performed through photodiode, then measurement simplicity is improved, but measurement precision deteriorates
Solution Approach 1:
The measurement system is segmented into distinct functional modules: the power supplier with current measurement capability and the luminance sensing circuit with photodiode-based luminance measurement. Each module performs its specific measurement function independently and accurately, then the results are combined to provide comprehensive character istic evaluation, improving overall measurement precision without excessive complexity.
Solution Approach 2:
The power supplier acts as an intermediary that bridges the power delivery function and the measurement function. It provides power to the display device while simultaneously measuring the power current, and works in coordination with the luminance sensing circuit to provide comprehensive measurements, thereby improving measurement accuracy without requiring a completely complex system redesign.
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
The solution enables accurate, automated measurement of luminance and power current, reducing equipment complexity and cost while improving measurement accuracy and enabling statistical evaluation of display device characteristics, thereby optimizing power consumption and compensating for luminance decreases.
Implementation Method 1
each of the first through third switches includes a reed switch
Data Source
AI summary
A measurement device includes a power supplier including a first terminal through which a first power voltage is output and a second terminal through which a second power voltage is output, the power supplier being configured to receive a first current from the first terminal to measure a power current of a display device and to receive a second current from the second terminal to measure a luminance of the display device; a switching circuit including a first switch configured to selectively connect a power terminal of the display device to the first terminal or an internal voltage terminal of the display device through which an internal voltage of the display device is output; and a luminance sensing circuit configured to receive the second power voltage and to generate the second current corresponding to the luminance of the display device.