LCD Drive Compensation for Mini LED Brightness Boundaries
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Solution Overview
Problem
Existing liquid crystal display devices using mini LEDs face challenges in mitigating step-like differences in brightness between adjacent LEDs when compensating pixel data, which affects image quality and contrast ratio.
Innovation Solution
A liquid crystal display drive device with an image processor that analyzes input image data, determines LED brightness levels, applies gains and compensation coefficients to pixel data, and calculates differential values to mitigate brightness differences between adjacent LEDs, enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming method is used to adjust LED brightness by units of local areas, then power consumption is reduced and contrast ratio is improved, but step-like brightness differences appear between adjacent LEDs
Solution Approach 1:
The patent applies local quality by differentiating between boundary pixels and non-boundary pixels in local dimming areas. Boundary pixels receive different compensation treatment (using both first and second gains) compared to non-boundary pixels (using only first gain), thereby locally adjusting the compensation strategy to eliminate step-like brightness differences at area boundaries while maintaining contrast ratio improvements within areas.
Solution Approach 2:
The patent changes the compensation parameters dynamically based on pixel location. The first gain is determined based on average luminance of the local dimming area, while the second gain is specifically applied to boundary pixels to compensate for brightness differences. This parameter adjustment resolves the step-like effect while preserving the contrast enhancement from local dimming.
2Manufacturing precision
If mini LED elements are used to increase the number of LEDs, then local dimming resolution is improved, but step-like brightness differences become more pronounced
Solution Approach 1:
The patent addresses the heightened step-like effect in mini LED displays by applying localized compensation to boundary pixels. Since mini LEDs create more granular local dimming areas with more boundaries, the patent specifically targets boundary pixels with additional second gain compensation, while non-boundary pixels use standard first gain compensation, thereby resolving the artifact problem while preserving the high resolution benefit.
Solution Approach 2:
The patent applies preliminary anti-action by pre-calculating and applying compensation gains to pixel data before display output. The image processor determines first gain based on area luminance and second gain for boundary pixels, then applies these gains to compensate for brightness differences before the image is displayed, preventing the step-like artifact from appearing to the user.
3Illumination intensity
If pixel data compensation is applied according to LED brightness levels, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the pixel data processing into two distinct compensation stages: first gain application based on local dimming area luminance characteristics, and second gain application specifically for boundary pixels. This segmentation allows the system to manage complexity by breaking down the compensation process into manageable, independent steps that can be implemented efficiently in the image processor.
Solution Approach 2:
The patent introduces an image processor as an intermediary component between the local dimming control and the display panel. This intermediary performs the complex compensation calculations by determining first and second gains based on luminance data and pixel location, then applies these gains to generate compensated pixel data. This intermediary approach centralizes the complexity in a dedicated processing unit rather than distributing it across multiple system components.
Data Source
AI summary
The present disclosure relates to a liquid crystal display drive device and a method of driving the same. An image processor of a liquid crystal display device may generate second pixel data by applying a first gain, determined according to a brightness level of each LED element, to first pixel data of each subpixel, may calculate a second gain by using a differential value obtained by differentiating the brightness level of each LED element for a location of each subpixel, and a weight and a compensation coefficient determined according to the brightness level of each LED element, generate third pixel data by applying the second gain to the second pixel data, and output the third pixel data. Various other methods, systems, and computer-readable media are also disclosed.