Image Display Apparatus Time-Sharing Data Drivers
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Solution Overview
Problem
As the number of light sources in image display apparatuses using liquid crystal panels increases to improve resolution, the number of data drivers and gate drivers also increases, leading to inefficiencies and potential luminance deviations between adjacent light sources.
Innovation Solution
The image display apparatus connects multiple light sources to a common data line and gate line, allowing data drivers to output signals in a time-sharing manner, reducing the number of data drivers and gate drivers required, and adjusting signal frequencies based on grayscale levels to compensate for increased driving frequency in low-grayscale regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of light sources is increased to improve resolution, then the image quality is improved, but the number of data drivers and gate drivers increases leading to system complexity and cost increase
Solution Approach 1:
The patent applies periodic action by time-division multiplexing the data drivers. A single data driver sequentially drives multiple light sources in different time periods within each frame cycle. The data driver outputs data signals to different vertical lines alternately, enabling one driver to control multiple light sources through periodic time-multiplexed operation, thereby reducing the total number of drivers required.
Solution Approach 2:
The patent implements dynamics by making the data driver's operating frequency variable. The driving frequency is dynamically adjusted based on the grayscale level being displayed - higher frequencies for low grayscale levels and lower frequencies for high grayscale levels. This dynamic frequency adjustment allows a single driver to efficiently handle multiple light sources while maintaining image quality.
2Device complexity
If multiple light sources are connected to common data lines and driven at high frequency, then the number of drivers is reduced, but luminance deviation occurs between adjacent light sources
Solution Approach 1:
The patent uses periodic action with duty cycle modulation to control luminance. By adjusting the duty cycle of the square wave data signals, the effective driving frequency for each light source is precisely controlled. This periodic duty cycle adjustment ensures that adjacent light sources receive appropriately timed and frequency-modulated signals, maintaining luminance uniformity across the display.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the driving frequency and duty cycle parameters based on grayscale levels. For low grayscale levels, higher driving frequencies are used, while for high grayscale levels, lower frequencies are applied. This parameter adaptation prevents luminance deviation by optimizing the driving conditions for each grayscale region.
3Manufacturing precision
If the driving frequency is increased for light sources in low-grayscale regions, then the image quality is improved, but the overall system complexity and power consumption increase
Solution Approach 1:
The patent implements local quality by applying different driving frequencies to different spatial regions and grayscale levels. Low grayscale regions (where higher quality is needed) receive higher driving frequencies, while high grayscale regions use lower frequencies. This localized frequency optimization improves image quality where necessary without unnecessarily increasing power consumption across the entire display.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the driving frequency based on the grayscale level being displayed. The system automatically selects appropriate frequency ranges - higher frequencies for low grayscale levels requiring better image quality, and lower frequencies for high grayscale levels where quality requirements are less stringent. This adaptive parameter adjustment optimizes the balance between image quality and power consumption.
Data Source
AI summary
The present disclosure relates to an image display apparatus. An image display apparatus according to an embodiment of the present disclosure includes a panel, a plurality of light sources for outputting light to the panel, a plurality of data drivers for outputting data signals to the plurality of light sources, and a plurality of gate drivers for outputting gate signals to the plurality of light sources, and among the plurality of light sources, light sources disposed in a first vertical line and light sources disposed in a second vertical line are connected to a first data line. Accordingly, it is possible to display an image by efficiently using the data drivers.