Tone Correction Circuit for LCD Lateral Stripes
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Solution Overview
Problem
Conventional liquid crystal display devices experience image quality deterioration due to insufficient tone voltage written into pixel electrodes, leading to the phenomenon of 'lateral stripes' when increasing refresh rates, particularly because pixel electrodes connected to different video signal lines differ in written tone voltage.
Innovation Solution
A display device with a correction circuit that compares and corrects tone data for pixel electrodes connected to different video signal lines, adjusting tone voltages based on differences and distances from the signal input end, and optimizing scanning signal durations to ensure uniform tone application across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the refresh rate of the liquid crystal display device is increased, then the motion picture display performance is improved, but the tone voltage written into the pixel electrodes becomes insufficient, resulting in image quality deterioration
Solution Approach 1:
The patent applies preliminary action by writing a preliminary voltage (first voltage) to the pixel electrode before the main tone voltage (second voltage). This preliminary voltage prepares the pixel electrode to receive the subsequent tone voltage more effectively, ensuring sufficient voltage writing even at high refresh rates. The correction circuit generates this preliminary voltage based on the relationship between the current and previous pixel electrodes, proactively compensating for potential voltage insufficiency before it occurs.
2Speed
If conventional liquid crystal display devices are used to increase refresh rates, then motion picture display performance is improved, but lateral stripes occur due to insufficient tone voltage, deteriorating image quality
Solution Approach 1:
The patent implements feedback by having the correction circuit compare the tone of video data for the current pixel electrode with that of the previous pixel electrode connected to the same video signal line. Based on this comparison, the correction circuit dynamically adjusts the preliminary voltage to be applied. This feedback mechanism ensures that tone voltage differences between adjacent pixel electrodes are compensated, preventing the formation of lateral stripes while maintaining high refresh rates.
3Area of stationary object
If pixel electrodes connected to different video signal lines are used, then display area coverage is improved, but differences in written tone voltage occur, causing lateral stripes
Solution Approach 1:
The patent applies local quality by providing different preliminary voltages to different pixel electrodes based on their specific characteristics and positions. The correction circuit determines the appropriate preliminary voltage for each pixel electrode individually, considering its connection to specific video signal lines and its relationship with adjacent pixel electrodes. This localized adjustment ensures uniform tone voltage across the entire display area, even when pixel electrodes are connected to different video signal lines.
Data Source
AI summary
The present invention prevents a TFT liquid crystal display device from deteriorating its image quality due to the insufficiency of voltage written through TFTs. There is disclosed a display device that includes a display panel in which the plural pixel electrodes are positioned between two neighboring video signal lines and arranged in the extending direction of the video signal lines, a pixel electrode connected to one of the two neighboring video signal lines through a TFT and a pixel electrode connected to the other video signal line through a TFT being alternately arranged; and a correction circuit that compares the tone of video data to be written into one of the plural pixel electrodes against the tone of video data to be written into a preceding pixel electrode that is connected through a TFT to the video signal line, to which the one of the plural pixel electrodes is also connected through a TFT, and placed one position toward a signal input end of the video signal line as compared to the one of the plural pixel electrodes, and corrects the video data to be written into the one of the plural pixel electrodes.