Flat Panel Display Row Scanning Sequence Optimization
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Solution Overview
Problem
Conventional flat panel display drive methods experience high power dissipation due to large grayscale variations between pixels, leading to impaired image quality and increased power consumption in portable devices.
Innovation Solution
A scan method that determines a scanning sequence based on the gray level difference of image data, using a control module with a memory and arithmetic/logic unit to select the row with the minimum gray level difference as the next scanning row, thereby optimizing the scanning sequence and reducing power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If scan signals are output sequentially from top to bottom, then the scanning process is simple and fast, but power dissipation increases due to large grayscale variations between adjacent rows
Solution Approach 1:
The control module performs preliminary comparison of grayscale values between the current row and candidate rows before determining the next scanning row. By pre-calculating grayscale differences and storing them in memory, the system prepares optimal scanning sequences in advance, reducing power dissipation without significantly increasing real-time control complexity
Solution Approach 2:
The scanning sequence is made dynamic by allowing the row driving unit to jump between different rows based on grayscale similarity rather than following a fixed top-to-bottom sequence. The control module dynamically determines the next row to scan by comparing grayscale values, creating an adaptive scanning pattern that minimizes power consumption while maintaining display performance
2Speed
If scan update speed is increased to maintain image quality, then static image quality is preserved through retention phenomenon, but each pixel has less time to charge/discharge fully
Solution Approach 1:
The invention changes the scanning sequence parameter dynamically based on grayscale variations. By selecting next rows with similar grayscale values, the system allows pixels to maintain their charge states longer, effectively extending the functional charging time even at high update speeds. This parameter adaptation resolves the conflict between fast scanning and complete pixel charging
3Manufacturing precision
If the quantity of pixels is increased to achieve higher resolution, then display resolution is improved, but power dissipation increases due to more charged/discharged operations
Solution Approach 1:
The display is segmented into rows with similar grayscale characteristics. By grouping and scanning rows with similar pixel values together, the system reduces the total number of charging and discharging operations required for high-resolution displays. This segmentation strategy maintains the high pixel count for resolution while minimizing power dissipation through intelligent row grouping
Data Source
AI summary
A control module for reducing power dissipation is connected to a column driving unit and a row driving unit. The control module includes a memory for storing display data temporarily and an arithmetic/logic unit connected to the memory. The arithmetic/logic unit takes grayscale image data of a current conducted row as a base row to compare with the grayscale image data of n rows that are temporarily stored in the memory and waiting to be scanned, so as to select the row with a minimum gray level difference as a next conducted row.