LCD Backlight Layout for Edge-Region Local Dimming
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Solution Overview
Problem
Conventional backlighting modules in LCD displays have uniform LED distribution, leading to constant resolution across the display area, which increases complexity and costs when trying to enhance resolution, and fails to provide sufficient local contrast and detail representation.
Innovation Solution
A display system with a backlighting module that has a higher number of individually drivable LEDs in the transition edge region and fewer interconnected LEDs in the main area, allowing for increased resolution and local dimming algorithms to enhance contrast by optimizing the transition between active display surfaces and black regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform distribution of LEDs is used across the entire backlighting module, then the manufacturing process is simplified and costs are reduced, but the local contrast and detail representation in transition regions are insufficient
Solution Approach 1:
The patent applies local quality by creating different LED density zones: a first region with higher LED density for transition edge areas requiring high local contrast, and a second region with lower LED density for main display areas. This non-uniform distribution optimizes local contrast representation in critical regions while maintaining manufacturing feasibility.
2Manufacturing precision
If the number of LEDs is increased across the entire backlighting module to enhance resolution, then the display resolution is improved, but the system complexity and costs increase
Solution Approach 1:
The backlighting module is segmented into multiple independently controllable regions with different LED densities. The control system divides LEDs into first and second groups corresponding to different display regions, allowing resolution enhancement in critical transition areas without uniformly increasing LED count across the entire module, thus managing system complexity.
Solution Approach 2:
Higher LED density is applied locally only in transition edge regions where high resolution is critical for contrast representation, while main display regions use lower LED density. This localized approach enhances overall display resolution without the cost and complexity of uniformly high-density LED distribution.
3Adaptability or versatility
If individual LED control is implemented across the entire backlighting module, then local dimming capability is maximized, but the control system complexity and cost increase
Solution Approach 1:
The control system segments LEDs into different groups (first group in transition region, second group in main region) with different control granularities. This segmentation enables local dimming capability where it is most needed while reducing control complexity in areas where high granular control is less critical.
Solution Approach 2:
Individual LED control is applied partially - with higher control granularity in transition edge regions where local contrast is critical, and lower control granularity in main display regions. This partial application of individual control maximizes local dimming capability in critical areas while managing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases local contrast and resolution, minimizing overexposure in black regions and reducing system costs by adjusting LED density and clustering, resulting in improved display representation and reduced brightness in non-visible areas.
Implementation Method 1
Instead of conventional cold cathode fluorescent lights (CCFL), LEDs (light emitting diodes) have been used as backlighting modules of an LCD liquid crystal display
Implementation Method 2
its function is based on the fact that liquid crystals influence the polarisation direction of light where a specific amount of electrical voltage is applied
Implementation Method 3
Polarized light is generated by means of polarization filters which are arranged on the display and which filter the incident light
Data Source
AI summary
A display system comprises a display, configured for displaying data, wherein the display comprises an inactive display edge not configured for displaying, and an active display inner surface configured for displaying. The display system further comprises a backlighting module having luminous units, wherein the backlighting module is arranged directly or indirectly at a rear side of the display, such that the light emitted by the luminous units forms a backlight for the display. The backlighting module comprises a backlighting edge corresponding to the display edge and comprises a backlighting inner surface corresponding to the display inner surface. The display system further comprises and a control system for driving the luminous units. A vehicle comprising a display system and a method for operating a display system is also provided.