Image Processing Circuit for OLED Multi-Frame Luminance Compensation
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Solution Overview
Problem
Image sticking and luminance drop on OLED panels due to large grayscale variations result in degraded image quality and reduced fingerprint sensing sensitivity, necessitating additional TFTs that lower transmittance and pixel density.
Innovation Solution
An image processing circuit and method that utilizes a receiver, memory, recognition circuit, calculation circuit, and compensation circuit to compensate for luminance drop by referencing multiple previous frames through a lookup table, adjusting image data to achieve desired luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal compensation scheme with more control switches is used, then luminance drop compensation is improved, but transmittance decreases
Solution Approach 1:
The patent introduces an external image processing circuit as an intermediary system that handles luminance drop compensation separately from the OLED pixel structure. This external circuit processes image data and generates compensation values based on grayscale variations, eliminating the need for additional TFTs within the pixel while achieving the same compensation effect.
Solution Approach 2:
The patent separates the compensation function from the display function by dividing the system into distinct components: the OLED display module and the external image processing circuit. This segmentation allows the display pixels to remain simple while the compensation logic resides in a dedicated external processing unit, avoiding the need for complex pixel structures.
2Reliability
If internal compensation scheme with more control switches is used, then luminance drop compensation is improved, but pixel density decreases
Solution Approach 1:
The external image processing circuit acts as an intermediary that performs compensation calculations outside the pixel structure. By moving the compensation logic to an external processor that handles image data frames, the patent eliminates the need for additional control switches within each pixel, thereby maintaining high pixel density while achieving effective luminance drop compensation.
Solution Approach 2:
The patent segments the compensation functionality from the pixel structure, placing it in an external processing unit that operates on image data frames. This separation allows pixels to maintain their simple, high-density structure while the external circuit handles the complex compensation logic through grayscale analysis and lookup tables.
3Reliability
If internal compensation scheme with more control switches is used, then luminance drop compensation is improved, but production yield decreases
Solution Approach 1:
The patent introduces an external image processing circuit as an intermediary system that handles compensation separately from the OLED manufacturing process. This approach eliminates the need to fabricate additional TFTs and control switches within each pixel, simplifying the manufacturing process and improving production yield while maintaining effective luminance drop compensation.
Solution Approach 2:
By segmenting the compensation function into a separate external processing unit, the patent simplifies the OLED pixel structure to its essential display components only. This reduces manufacturing complexity and improves yield, as the external processing circuit can be manufactured and integrated separately without affecting the delicate OLED pixel fabrication process.
4Adaptability or versatility
If grayscale values vary extremely, then image content changes are improved, but luminance drop increases
Solution Approach 1:
The patent implements a feedback mechanism where the image processing circuit continuously monitors grayscale values in current and previous image frames. When extreme grayscale variations are detected, the system automatically calculates and applies compensation values based on the magnitude of change, creating a closed-loop control system that adapts to image content variations and maintains stable luminance output.
Solution Approach 2:
The patent performs preliminary analysis of grayscale variations by comparing current image frames with previous frames before displaying the image. This preliminary detection allows the system to predict potential luminance drop issues and pre-calculate compensation values, applying them proactively to prevent luminance instability before it manifests in the displayed image.
Data Source
AI summary
An image processing circuit includes a receiver, at least one memory, a recognition circuit, a calculation circuit and a compensation circuit. The receiver is configured to receive a current image frame and a plurality of previous image frames. The at least one memory is configured to store the plurality of previous image frames. The recognition circuit is configured to select a first previous image frame or a second previous image frame among the plurality of previous image frames from the at least one memory. The calculation circuit is configured to calculate a compensation value for the current image frame according to at least one of the first previous image frame and the second previous image frame by referring to a lookup table (LUT). The compensation circuit is configured to modify a current image data of the current image frame by using the compensation value.