OLED Driver IC External Compensation ADC Calibration
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Solution Overview
Problem
Variations in electrical characteristics between pixels in OLED displays lead to luminance variations, making it difficult to implement desired images and meet image quality requirements, and existing external compensation techniques are hindered by distortion in digital sensing data due to ADC characteristic variations.
Innovation Solution
A driver integrated circuit for external compensation that includes a voltage generator, a calibration unit to decode calibration data, a sensor to sample signals from pixels, and an analog-to-digital converter to convert analog signals into digital signals, enhancing sensing and compensation performance by compensating for characteristic variations between ADCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If external compensation technique is used to compensate for luminance variation, then luminance uniformity is improved, but measurement precision deteriorates due to ADC characteristic variations causing distortion in digital sensing data
Solution Approach 1:
The patent introduces a sensor as an intermediary component between the pixel and the ADC. The sensor samples the output signal from the pixel before it reaches the ADC, allowing the system to measure and compensate for ADC characteristic variations separately from the pixel characteristics. This intermediary sampling mechanism enables accurate sensing of pixel electrical characteristics while isolating the ADC's influence on measurement precision.
Solution Approach 2:
The patent performs preliminary sampling of the pixel output signal using the sensor before the signal is converted by the ADC. By sampling the analog signal at this intermediate stage, the system can later process and compensate for any distortion introduced by the ADC during conversion, thereby maintaining measurement precision while enabling luminance compensation.
2Productivity
If ADC is used to convert analog sensing data into digital data, then data processing capability is improved, but measurement precision deteriorates due to characteristic variation between ADCs
Solution Approach 1:
The sensor acts as an intermediary that samples the analog signal from the pixel before it enters the ADC. This allows the ADC to perform its conversion function with high processing capability while the sensor captures the original analog characteristics, enabling subsequent compensation for any ADC-induced distortion and maintaining measurement precision.
Solution Approach 2:
The system uses the sensor to continuously monitor and sample the analog output from the pixel, providing feedback about the actual signal characteristics. This feedback information can then be used to compensate for ADC characteristic variations, allowing the system to maintain accurate measurement despite the presence of multiple ADCs with different characteristics.
Data Source
AI summary
A driver integrated circuit, a display device including the driver integrated circuit, and a data correction method of the display device are disclosed. The driver integrated circuit includes a voltage generator generating a sensing data voltage, a calibration unit that decodes N-bit calibration data input from the voltage generator and generates at least one calibration voltage, where N is a positive integer, a sensor that samples a signal output from a pixel corresponding to the sensing data voltage in a sensing mode for sensing electrical characteristics of the pixel and samples the calibration voltage in a calibration mode for sensing output characteristics of an analog-to-digital converter, and the analog-to-digital converter converting an analog signal sampled by the sensor into a digital signal.