Display Processor Sensing Control for Low-Grayscale Line Artifacts
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Solution Overview
Problem
Display devices exhibit visible dark horizontal lines during low grayscale image display due to changes in transistor characteristics, necessitating a method to mitigate this visibility.
Innovation Solution
A processor and display device system that includes an interface circuit, pattern detecting circuit, brightness detecting circuit, and real-time sensing circuit to control pixel light emission based on panel brightness and light-emitting pixel ratios, adjusting sensing operations to prevent horizontal lines by alternating pixel light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If real-time sensing is performed continuously to compensate for transistor characteristic changes, then display quality is improved, but visible dark horizontal lines appear during low grayscale image display
Solution Approach 1:
The patent implements dynamic control of the real-time sensing operation by adjusting the sensing enable signal based on detected image characteristics. The system transitions from continuous sensing to conditional sensing, where the sensing operation is activated or deactivated according to whether the current frame contains low grayscale regions that would trigger horizontal line artifacts. This dynamic adjustment resolves the contradiction by adapting the sensing behavior to specific display conditions.
Solution Approach 2:
The patent replaces the continuous mechanical-like operation of real-time sensing with a controlled, condition-based operation. By introducing pattern detection circuits that analyze image data and generate control signals, the system substitutes unconditional continuous sensing with conditional sensing that is activated only when necessary. This substitution eliminates the harmful horizontal lines while preserving display quality compensation where needed.
2Object-affected harmful factors
If real-time sensing is stopped during low grayscale display to prevent horizontal lines, then horizontal line visibility is reduced, but transistor characteristic changes are not compensated
Solution Approach 1:
The patent implements a feedback mechanism where the pattern detection circuit continuously monitors the image data and provides control signals to the real-time sensing circuit based on detected patterns. When low grayscale patterns are detected that would cause horizontal lines, the system provides feedback to disable sensing. When such patterns are not present, feedback enables sensing to compensate for transistor characteristics. This feedback loop resolves the contradiction by making sensing operation dependent on actual display needs.
Solution Approach 2:
The patent changes the operational parameter of the real-time sensing circuit from a fixed continuous mode to a variable mode controlled by image content parameters. The sensing enable signal acts as a control parameter that switches between active and inactive states based on detected image characteristics. This parameter change allows the system to optimize between preventing horizontal lines and compensating for transistor variations depending on the displayed content.
3Object-affected harmful factors
If pattern detection and conditional sensing control are added to the system, then horizontal line visibility is prevented, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the existing display driver architecture. The pattern detection capability is incorporated into the existing data processing path, and the real-time sensing circuit uses its existing infrastructure while adding conditional control. The sensing enable signal mechanism leverages existing control signal pathways in the driver circuitry. This multi-functional integration approach minimizes additional complexity while achieving horizontal line prevention.
Data Source
AI summary
A processor including: an interface circuit to receive first image data and convert the first image data into second image data; a pattern detecting circuit to detect a pattern in the first or second image data; a brightness detecting circuit to detect a panel brightness value, and to detect a ratio of pixels emitting light; and a real-time sensing circuit, wherein when the pattern is not detected, the real-time sensing circuit performs/stops real-time sensing of the pixels based on whether the panel brightness value is within a range and the ratio of pixels emitting light is greater than or equal to a first threshold; and when the pattern is detected, the real-time sensing circuit performs/stops the real-time sensing of the pixels based on whether the panel brightness value is within the range and the ratio of pixels emitting light is greater than or equal to a second threshold.