Panel Driver Row Sensing for Low-Grayscale Display Compensation
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Solution Overview
Problem
Display devices experience deviations in pixel characteristics such as threshold voltage and mobility, leading to discrepancies in brightness and reduced display quality due to process variations and degradation, which existing compensation methods fail to adequately address.
Innovation Solution
A display device with a panel driver that intermittently and randomly senses pixel rows during low grayscale images, using sensing frame periods and non-sensing frame periods to adjust input image data and compensate for pixel deviations, while also calculating temperature and detecting overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel characteristics deviation compensation is performed through continuous sensing, then manufacturing precision is improved, but display quality deteriorates due to visible horizontal lines in low grayscale images
Solution Approach 1:
The patent implements periodic sensing by alternating between sensing frame periods and non-sensing frame periods. The panel driver senses pixel characteristics only during sensing frame periods and skips sensing during non-sensing frame periods, creating a periodic sensing pattern that reduces visible horizontal lines while maintaining compensation effectiveness
Solution Approach 2:
The patent dynamically adjusts the sensing pattern based on image grayscale characteristics. When low grayscale images are detected, the panel driver switches to intermittent sensing mode with random pixel row selection. This dynamic adaptation allows the system to optimize between compensation precision and visual quality based on real-time image content
2Object-affected harmful factors
If intermittent random sensing is implemented, then display quality is improved by minimizing visible horizontal lines, but sensing data collection for temperature and overcurrent detection is reduced
Solution Approach 1:
The patent makes the sensing system multi-functional by using the same sensing circuitry for both display quality optimization (reducing horizontal lines) and panel health monitoring (temperature and overcurrent detection). The panel driver integrates multiple sensing purposes into a single system, allowing intermittent random sensing to serve both display quality improvement and diagnostic functions
Solution Approach 2:
The patent changes sensing parameters dynamically based on operational conditions. The panel driver adjusts sensing frequency, pixel row selection patterns, and sensing duration based on image grayscale characteristics and panel temperature conditions, optimizing the balance between visual quality and data collection requirements
3Object-affected harmful factors
If random pixel row sensing is performed, then image quality is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements preliminary classification of image data before sensing. The panel driver first analyzes image grayscale characteristics to determine whether intermittent random sensing is needed, then activates the appropriate sensing pattern. This preliminary action avoids unnecessary complex sensing operations for high grayscale images, reducing overall system complexity
Data Source
AI summary
A display device including: a display panel which includes a plurality of pixels arranged in first to nth pixel rows, wherein n is a natural number greater than 1; and a panel driver which drives the display panel in response to input image data, and generates sensing data by sensing the plurality of pixels, wherein the panel driver randomly senses one of the first to nth pixel rows in each of a plurality of sensing frame periods when the input image data correspond to a low grayscale image, wherein the sensing frame periods are repeated and consecutive non-sensing frame periods are provided between the sensing frame periods.