Driver IC External Compensation Sensing Modes
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Solution Overview
Problem
Existing display technologies face challenges in minimizing distortion of sensing data due to variations in electrical characteristics between pixels, leading to luminance deviations that cannot be properly compensated for in OLED displays.
Innovation Solution
A driver integrated circuit (IC) with a sensing unit, sample and hold unit, and analog-to-digital converter (ADC) is designed to operate in both current sensing and voltage sensing modes, using sensing switches and a sample and hold unit to accurately sample and convert analog data into digital data, thereby minimizing data distortion and ensuring consistent pixel brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If external compensation technique is used to compensate for luminance variation, then luminance uniformity is improved, but sensing data distortion occurs due to electrical characteristic variations between pixels
Solution Approach 1:
The patent applies preliminary action by performing offset calibration before actual sensing operations. The sensing unit first measures offset values when no current flows through the pixel, then uses these offset values to correct subsequent sensing data. This preliminary calibration eliminates the distortion caused by electrical characteristic variations, ensuring accurate luminance compensation without compromising sensing data precision.
2Reliability
If sensing unit measures electrical characteristics of pixels, then luminance variation compensation is enabled, but data distortion occurs due to offset variations in sensors and ADCs
Solution Approach 1:
The patent implements feedback by using the measured offset values to correct subsequent sensing measurements. The sensing unit continuously monitors electrical characteristics, compares them against the calibrated offset values, and applies corrections to eliminate distortion. This feedback mechanism ensures that offset variations in sensors and ADCs do not compromise the accuracy of luminance compensation.
Solution Approach 2:
The patent replaces direct current sensing with voltage sensing after current-to-voltage conversion. By measuring voltage instead of current directly, the system reduces the impact of offset variations and electrical characteristic variations. The sensing unit measures voltage across the pixel, which is then converted to current information, thereby minimizing data distortion while maintaining compensation accuracy.
3Measurement precision
If multiple sensing modes (current and voltage) are implemented, then sensing performance is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a sensing unit that can operate in multiple modes (current sensing and voltage sensing) using the same hardware infrastructure. The sensing unit includes switches that can configure the measurement circuitry to perform either current-to-voltage conversion followed by voltage sensing, or direct voltage sensing. This multi-functional design improves sensing performance and provides flexibility to handle different sensing scenarios without significantly increasing device complexity.
Data Source
AI summary
A driver integrated circuit for external compensation and a display device including the same are disclosed. The driver integrated circuit includes a sensing unit including a plurality of sensing switches, that is connected to a plurality of pixels through a sensing channel and operates differently depending on a current sensing mode and a voltage sensing mode, the sensing unit configured to sense electrical characteristics of the pixels input from the sensing channel, a sample and hold unit configured to sample analog sensing data corresponding to the electrical characteristics of the pixels, and an analog-to-digital converter (ADC) configured to convert the analog sensing data sampled by the sample and hold unit into digital sensing data.