Display Measurement Circuit for Automatic Luminance and Power Testing
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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 of display devices, reducing complexity and cost by using reed switches to connect power terminals and internal voltage terminals for sequential measurement.
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, eliminating the need for separate power supply equipment and reducing overall device complexity.
Solution Approach 2:
The power supplier is designed with multi-functionality, serving both as a power source and a measurement instrument. By configuring the power supplier to output power voltages and simultaneously measure power currents, the device achieves universal functionality that reduces the number of separate equipment needed.
2Extent of automation
If manual operation is required to operate measuring device and power supply device, then measurement control is improved, but ease of operation deteriorates
Solution Approach 1:
The measurement device performs self-service by automatically controlling the measurement process. The controller automatically switches between measurement modes, sequences the measurement steps, and processes the data without requiring manual intervention, thereby improving ease of operation while maintaining precise measurement control.
3Measurement precision
If power current measurement is performed, then measurement accuracy is improved, but measurement time increases due to sequential measurement periods
Solution Approach 1:
The patent employs periodic action by dividing the measurement into distinct measurement periods that repeat cyclically. The controller switches between first measurement periods for power current measurement and second measurement periods for luminance measurement, allowing systematic data collection while maintaining measurement accuracy through structured periodic operation.
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
Accurately measures luminance and power current of display devices, reducing equipment complexity and cost while enabling automatic measurement of multiple devices, improving measurement accuracy and allowing for statistical evaluation of characteristics.
Implementation Method 1
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
Implementation Method 2
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
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.