Display Circuit Dynamic Reference Voltage Compensation
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Solution Overview
Problem
Existing image display devices, such as organic EL devices, suffer from the 'burning phenomenon' due to brightness differences between pixels, leading to reduced lifespan, and current measuring devices require a wide measurement range to compensate for deterioration and temperature variations, resulting in increased circuit size.
Innovation Solution
An image display device with a detection means that uses a reference voltage to detect both large current changes due to temperature and small changes due to device deterioration, allowing for effective compensation without increasing circuit size, by employing a detection circuit that adjusts its measurement range using different reference voltages and shares signal lines for data and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current measuring device with a wide measurement range is used to detect both large current changes due to temperature and small current changes due to device deterioration, then the ability to detect and compensate for various current variations is improved, but the circuit size of the current measuring device increases
Solution Approach 1:
The patent applies dynamics by making the reference voltage adjustable rather than fixed. The detection circuit switches between a first reference voltage for detecting temperature-induced current changes and a second reference voltage for detecting deterioration-induced current changes. This dynamic switching allows a single detection circuit to accurately measure both large and small current variations without requiring an overly complex wide-range measurement system, thus resolving the contradiction between measurement precision and device complexity.
2Device complexity
If a single reference voltage is used for current detection, then the circuit design is simple, but the ability to detect both large temperature variations and small deterioration changes is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the current detection task into two distinct phases with different reference voltages. First, a first reference voltage is used to detect large current changes caused by temperature variations. Second, a second reference voltage is used to detect smaller current changes caused by device deterioration. This segmentation allows each detection phase to use an optimized reference voltage for its specific measurement range, improving overall measurement precision while maintaining relatively simple circuit design through the use of switching elements.
Data Source
AI summary
To provide an image display device having a circuit for solving burning phenomenon without increasing the size of the circuit. An image display device is provided having a display unit formed using display devices, a signal line for inputting a display signal voltage to the display unit, and a display control unit for controlling the display signal voltage, the image display device comprising a detection power source, a switch for causing a current of the detection power source to flow to the display device, a detection circuit for detecting the current, and a detection information storage circuit for storing information, and compensating the display signal voltage, using the information, wherein using a first reference voltage, and current detection is carried out, the detection circuit feeds back the current detected to set a second reference voltage different from the first reference voltage, and carries out current detection.