Display Device Gradation Correction for Interlace Mode Switching
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Solution Overview
Problem
Switching between progressive and interlace driving modes in liquid crystal display devices leads to luminance variations and image quality deterioration, particularly due to differences in power consumption and effective voltage applied to pixels, resulting in line disturbance and aliasing distortion.
Innovation Solution
A display device with a gradation correction table that calculates and applies correction data to adjust luminance values, allowing seamless switching between progressive and interlace modes by setting approximated gradations that minimize luminance differences, thereby stabilizing image display and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If interlace driving is used to reduce power consumption, then power consumption is reduced, but luminance variation and image quality deterioration occur
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the driving frequency of the liquid crystal display device based on the power supply state. When battery power is detected, the device switches to interlace driving mode with a lower refresh rate (e.g., 30Hz or 60Hz field rate), reducing power consumption. When AC power is detected, it switches to progressive driving mode with a higher refresh rate (e.g., 60Hz or 120Hz), improving image quality. This parameter change in driving frequency and mode resolves the contradiction between power consumption and image quality.
Solution Approach 2:
The patent implements dynamics by making the driving mode flexible and adaptable rather than fixed. The display device dynamically switches between progressive and interlace driving modes based on real-time detection of power supply state. This dynamic adaptation allows the system to optimize performance according to available power, resolving the contradiction by making the operating parameters changeable rather than static.
2Manufacturing precision
If progressive driving is used to maintain image quality, then image quality is maintained, but power consumption increases
Solution Approach 1:
The patent uses parameter changes to adjust the driving frequency and mode based on power supply conditions. When AC power is available, progressive driving mode is used with higher refresh rates to maintain excellent image quality. When battery power is detected, the system transitions to interlace driving mode with lower refresh rates, reducing power consumption. This parameter adjustment resolves the contradiction by matching image quality requirements with available power resources.
Solution Approach 2:
The patent applies dynamics by implementing a flexible driving system that can switch between progressive and interlace modes. The system dynamically detects power supply state and adjusts driving parameters accordingly, allowing it to maintain high image quality when power is abundant while conserving energy when power is limited, thus resolving the contradiction between image quality and power consumption.
3Use of energy by moving object
If switching between progressive and interlace driving is implemented for power saving, then power consumption is reduced, but luminance variation occurs during mode switching
Solution Approach 1:
The patent applies preliminary action by performing a gradual transition during mode switching rather than an abrupt change. When switching between progressive and interlace driving modes, the system gradually adjusts the refresh rate and driving parameters over multiple frames, allowing the liquid crystal molecules to adapt smoothly. This preliminary gradual adjustment prevents sudden luminance variations and maintains visual stability during power-saving mode transitions.
Solution Approach 2:
The patent implements beforehand cushioning by using frame buffering and gradual parameter transition during mode switching. The system prepares for mode changes by gradually adjusting driving parameters across multiple frames, cushioning the transition to prevent abrupt luminance changes. This approach maintains luminance stability while enabling power-saving mode switches.
Data Source
AI summary
A display method can be flexibly applied to suppress the power consumption and a device and display method which can reduce the power consumption while the image quality is prevented from being deteriorated are provided. A display device which can be operated in a progressive mode and interlace mode includes a display portion having a plurality of pixels arranged thereon and a gradation correction table which stores data used to correct a difference between a gradation level when the display portion is driven in the progressive mode and a gradation level when it is driven in the interlace mode. Then, when video data supplied to the display portion is set in the interlace mode, a timing controller corrects the video data by use of data in the gradation correction table.