Active-Area LED Backlight Layout for Artifact and Heat Control
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Solution Overview
Problem
Conventional backlight assemblies for displays with passive pixels are prone to visible artifacts, are not robust, and occupy excessive space, limiting their effectiveness and aesthetic appeal in electronic devices.
Innovation Solution
The implementation of a backlight unit with an array of light-emitting diodes (LEDs) and driver integrated circuits (ICs) mounted on a glass substrate, where the LEDs are arranged in a non-square-grid layout and the driver ICs are interspersed amongst the LEDs to optimize brightness levels frame-by-frame, and include a thermally conductive layer and sensors for real-time control, enhancing thermal management and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional backlight assemblies are used, then displays can be illuminated, but visible artifacts occur and aesthetic appeal deteriorates
Solution Approach 1:
The backlight is divided into multiple independently controllable LED zones rather than using a single conventional backlight assembly. Each LED or group of LEDs can be individually controlled to eliminate visible artifacts and improve local dimming performance, directly resolving the issue of visible artifacts while maintaining illumination capability
Solution Approach 2:
The backlight system implements dynamic control of LED brightness levels frame-by-frame based on image content analysis. This dynamic adjustment allows the backlight to adapt to different display scenarios, eliminating static visible artifacts and improving overall aesthetic appeal while maintaining effective illumination
2Area of stationary object
If driver integrated circuits are placed in the active area, then space is minimized, but device complexity increases
Solution Approach 1:
Driver integrated circuits are merged with the LED array structure, with driver ICs strategically positioned within the active area among the LEDs. This integration eliminates the need for separate driver circuit boards or peripheral mounting, minimizing the overall backlight unit space while the modular driver design keeps complexity manageable
Solution Approach 2:
The driver integrated circuits are arranged in a two-dimensional layout within the active area rather than being mounted on peripheral edges. This spatial reorganization allows efficient use of the active area for both light emission and driver functionality, minimizing total space occupation while distributing complexity across multiple small-scale integrated circuits
3Ease of manufacture
If LEDs are arranged in a regular grid, then manufacturing is simplified, but periodicity artifacts occur
Solution Approach 1:
The LED array uses an asymmetric or irregular spacing pattern instead of a regular grid arrangement. This asymmetric layout disrupts the periodicity that causes visible artifacts while still allowing for standardized LED components and simplified manufacturing processes, as the irregular pattern can be achieved through standard mounting techniques with varied positioning
4Illumination intensity
If backlight brightness is increased, then image visibility improves, but thermal performance deteriorates
Solution Approach 1:
The backlight is segmented into multiple independently controllable LED zones that can be activated at different brightness levels. This allows the system to provide high brightness only where and when needed for image visibility, while keeping other zones at lower brightness or off, thereby managing thermal generation and improving overall thermal performance
Solution Approach 2:
The backlight implements dynamic brightness adjustment that responds to both image content and thermal conditions. When thermal thresholds are approached, the system dynamically reduces brightness in affected zones while maintaining visibility in cooler zones, achieving a balance between image visibility and thermal management
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 improves the dynamic range and efficiency of the backlight, reduces visible artifacts, and minimizes space usage, resulting in a more robust and aesthetically pleasing display solution.
Implementation Method 1
The backlight unit may include an array of light-emitting diodes
Implementation Method 2
the backlight may include a thermally conductive layer that is attached to a lower surface of the glass substrate for the light-emitting diodes
Implementation Method 3
A reflective layer may be formed on the upper surface of the glass substrate. A reflective layer may also be formed on a lower surface of the glass substrate
Implementation Method 4
the glass substrate may be formed from white diffusive glass
Data Source
AI summary
A pixel array may be illuminated with backlight illumination from a backlight. The backlight may include a two-dimensional array of light-emitting diodes, with each light-emitting diode being placed in a respective cell. Different light-emitting diodes may have unique brightness magnitudes based on the content of the given display frame. Driver integrated circuits may control one or more associated light-emitting diodes to have a desired brightness level. The driver integrated circuits may be formed in an active area of the backlight. The driver integrated circuits may be arranged in groups that are daisy chained together. A digital signal (that includes information such as addressing information) may be propagated through the group of driver integrated circuits. To manage thermal performance of the backlight, the backlight may include a thermally conductive layer and/or a heat sink structure. To increase the efficiency of the backlight, the backlight may include one or more reflective layers.