LCD Driver Error Diffusion for Flicker-Free Color Reduction
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Solution Overview
Problem
The challenge lies in combining color reducing and enlarging processes for LCD panels without deteriorating the image quality, as existing methods can lead to flicker due to changes in spatial frequency of brightness.
Innovation Solution
A display panel driver is designed with a color reducing circuit that uses error diffusion to generate different error values for image data, allowing for simultaneous execution of color reduction and enlargement processes by driving pixels on LCD panels using distinct error values for horizontal lines, thereby maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If color reducing process and enlarging process are simply combined, then power consumption and EMI are reduced, but image quality deteriorates due to flicker generation
Solution Approach 1:
The patent segments the error diffusion process by applying different error values (first error value and second error value) to different pixels within the same horizontal line. This segmentation allows the color reducing process and enlarging process to be combined without generating flicker, as adjacent pixels use different error diffusion patterns that prevent regular brightness variations.
Solution Approach 2:
The patent applies local quality by using different error values for different pixels based on their position. Specifically, pixels at even positions use one error value while pixels at odd positions use another error value. This localized differentiation maintains image quality while enabling power consumption reduction through the combined color reducing and enlarging processes.
2Object-generated harmful factors
If color reducing process and enlarging process are simply combined, then EMI is reduced, but image quality deteriorates due to flicker generation
Solution Approach 1:
The patent segments the error diffusion process by applying different error values (first error value and second error value) to different pixels within the same horizontal line. This segmentation allows the color reducing process and enlarging process to be combined without generating flicker, as adjacent pixels use different error diffusion patterns that prevent regular brightness variations.
Solution Approach 2:
The patent applies local quality by using different error values for different pixels based on their position. Specifically, pixels at even positions use one error value while pixels at odd positions use another error value. This localized differentiation maintains image quality while enabling power consumption reduction through the combined color reducing and enlarging processes.
3Measurement precision
If the number of pixels is increased, then display resolution is improved, but data transfer amount and power consumption increase
Solution Approach 1:
The patent merges the color reducing process and enlarging process into a single integrated operation within the LCD driver. By combining these functions, the system can drive fewer pixels (e.g., QVGA instead of VGA) while achieving the desired display resolution through on-driver enlargement, thereby reducing data transfer amount and power consumption.
Solution Approach 2:
The patent implements multi-functionality by making the LCD driver perform both color reduction and image enlargement functions. This universal approach allows the driver to handle both high-resolution and low-resolution display needs, reducing the requirement for external image processing units and decreasing overall system power consumption.
4Loss of information
If the number of displayable gradations is increased, then color depth is improved, but chip size increases
Solution Approach 1:
The patent merges the color reducing process and enlarging process into a single integrated operation within the LCD driver. By combining these functions, the system can drive fewer pixels (e.g., QVGA instead of VGA) while achieving the desired display resolution through on-driver enlargement, thereby reducing data transfer amount and power consumption.
Solution Approach 2:
The patent implements multi-functionality by making the LCD driver perform both color reduction and image enlargement functions. This universal approach allows the driver to handle both high-resolution and low-resolution display needs, reducing the requirement for external image processing units and decreasing overall system power consumption.
Data Source
AI summary
A display panel driver includes a color reducing circuit and a driving section. The driving section is configured to drive a first pixel and a second pixel. If a second input image data and a third input image data corresponding to the second pixel are supplied as an image data of a second image display format, then the color reducing circuit generates a third color reduction image data and a fourth color reduction image data. If the first input image data is supplied as the image data of the first image display format, then the first selector selects the third error value, and if the second input image data and the third input image data are supplied as the image data of the second image display format, then the first selector selects the second error value.