Non-Sequential Scan Method for LED Display Panels
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Solution Overview
Problem
Modern LED panels using sequential scan methods suffer from the 'jelly effect' when captured by digital mobile phones or cameras, resulting in unwanted black or dark lines in videos due to rolling shutter effects, degrading video quality.
Innovation Solution
A non-sequential scan method for LED panels, where the scan order of pixel rows is randomized by generating and accumulating scan numbers, allowing each row to be scanned based on internal calculations rather than a fixed sequential order, using a control circuit and power switch circuit to implement this method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sequential scan method is used, then the display panel can be scanned in a simple and systematic order, but black lines or dark lines are generated in captured videos due to rolling shutter effects
Solution Approach 1:
The patent applies dynamics by changing from a fixed sequential scan pattern to a dynamic non-sequential scan pattern where the scan order varies between frames. The scan line jumps to different rows based on accumulated numbers and inversion operations, making the scan pattern adaptive and variable rather than static and predictable, thereby eliminating the rolling shutter effect that causes black lines in videos.
Solution Approach 2:
The patent changes the scan parameters by introducing inversion operations on accumulated numbers. Instead of scanning rows in simple ascending order (1, 2, 3, 4, 5), the system inverts the accumulated number to determine the scan row (e.g., inverting 1 gives 4, inverting 2 gives 3), creating a non-sequential scan pattern that disrupts the rolling shutter effect while maintaining systematic control.
2Object-affected harmful factors
If non-sequential scan method is used, then the jelly effect is reduced in captured videos, but the control circuit complexity increases
Solution Approach 1:
The control circuit performs self-service by generating the non-sequential scan pattern internally using simple arithmetic operations (accumulation and inversion) without requiring external input signals or complex pre-programmed sequences. The circuit uses its own internal counters and inverters to automatically determine the scan row order, reducing the need for external control complexity while achieving the non-sequential scan effect.
Solution Approach 2:
The patent replaces complex mechanical or external control mechanisms with simple electronic arithmetic operations. Instead of using complex external control signals or mechanical switching systems to achieve non-sequential scanning, the invention uses digital accumulation and inversion operations that can be implemented with simple logic circuits, reducing overall system complexity while achieving the desired scan pattern.
3Adaptability or versatility
If external indications and memory are used to store scan order, then the scan pattern can be controlled, but the reception bandwidth and circuit area increase
Solution Approach 1:
The patent extracts and eliminates the need for external indication signals and large memory structures by implementing the scan pattern generation entirely within the display driver using minimal internal resources. The system only requires small counters and inversion logic that can be integrated directly into the driver circuit, removing the need for separate external control systems and large memory arrays, thereby reducing circuit area while maintaining scan control flexibility.
Data Source
AI summary
A method of scanning a display panel having a plurality of rows of pixels includes steps of: generating a first accumulated number; calculating a first scan number according to the first accumulated number; scanning a present row of pixels having the first scan number among the plurality of rows of pixels; accumulating the first accumulated number to generate a second accumulated number; calculating a second scan number according to the second accumulated number; and scanning a next row of pixels having the second scan number among the plurality of rows of pixels after scanning the present row of pixels. Wherein, the plurality of rows of pixels are scanned in a scan order different from a numbering order of the plurality of rows of pixels.