Image Display Apparatus Reducing Switching Noise via Standing Bit Control
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Solution Overview
Problem
In data processing systems with multiple-bit data buses, simultaneous switching noise causes electromagnetic interference, which is exacerbated by increased signal speed and bit numbers, leading to complications in noise reduction, particularly in image data processing where high-speed processing is required.
Innovation Solution
An image display apparatus that loads image data into a frame memory via a data bus in a predetermined number of bits, calculates the difference sum of standing bits for divided color information, and displays background images with a difference sum within the lower 50% of descending order sums for brightness grayscale levels of 90% or greater, reducing switching noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If buffer circuit and delay circuit are added to each signal line for skew adjustment, then simultaneous switching noise is reduced, but device complexity increases
Solution Approach 1:
The invention extracts only the essential function of noise reduction by selecting background image data with specific standing bit characteristics rather than adding complex circuits. The patent identifies and uses background image data where the number of standing bits in each color component is within a predetermined range, thereby reducing simultaneous switching noise without requiring buffer or delay circuits in each signal line.
Solution Approach 2:
The invention changes the parameter of background image data selection by specifying that the number of standing bits in each color component (R, G, B) should be within a predetermined range. This parameter-based approach allows noise reduction through data selection rather than circuit modification, avoiding the complexity of adding delay circuits to each signal line.
2Object-affected harmful factors
If complicated processing is applied to reduce simultaneous switching noise, then noise is reduced, but processing speed decreases
Solution Approach 1:
The invention performs preliminary action by pre-determining the standing bit counts for background image data and storing this information in advance. The processor uses this pre-calculated standing bit count information to quickly select appropriate background image data without performing complicated real-time processing, thereby reducing noise while maintaining high processing speed.
Solution Approach 2:
The invention applies self-service by using the background image data's own standing bit characteristics to determine its suitability for display. The system automatically selects background image data where the standing bit counts in each color component are within the predetermined range, eliminating the need for external complicated noise reduction processing and maintaining fast processing speeds.
Data Source
AI summary
In an image display apparatus, a processor loads background image data into a frame memory via a data bus in a unit of a predetermined number of bits. When the color information for each pixel is divided into n parts to form divided data in a unit of the predetermined number of bits, the number of standing bits is calculated for each of the parts of the divided data, differences in the number of standing bits between the n parts of the divided data are calculated, and the sum of the differences in the number of standing bits is calculated as a difference sum, the background image data has a difference sum that falls within a lower 50% of the difference sums arranged in descending order for the color information that satisfies a condition that a brightness grayscale level is 90% or greater.