LED Display Cathode Grid Layout for Uniform Local Dimming
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Solution Overview
Problem
Electronic devices with displays face challenges in achieving desired optical performance and power efficiency due to bulky components and uneven light distribution, leading to dark spots and inefficient power consumption.
Innovation Solution
The use of an array of light-emitting diodes with a common cathode formed in a grid or around the periphery, featuring multiple smaller vias and independently adjustable light sources to prevent dark spots and optimize power usage, allowing for local dimming and enhanced dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single large via is used in each light-emitting diode, then the structure is simpler, but dark spots appear in the light emission
Solution Approach 1:
The patent divides each light-emitting diode's via structure into multiple smaller vias arranged in an array pattern. This segmentation of the single large via into multiple smaller vias prevents dark spots in the light emission while maintaining electrical connectivity, directly resolving the contradiction between structural simplicity and light emission uniformity.
2Reliability
If components are made bulky to ensure structural integrity, then reliability improves, but optical performance and power efficiency deteriorate
Solution Approach 1:
The patent changes the geometric parameters of the via structure by transitioning from a single large via to multiple smaller vias with optimized dimensions and spacing. This parameter optimization maintains structural integrity while improving light emission uniformity and power efficiency, resolving the contradiction between reliability and power efficiency.
3Device complexity
If a common cathode is shared by all light-emitting diodes, then device complexity is reduced, but control flexibility for local dimming is limited
Solution Approach 1:
The patent segments the cathode control structure by providing separate cathode connections for different groups or regions of light-emitting diodes. This segmentation enables independent control of different display regions for local dimming while maintaining a relatively simple overall cathode architecture, resolving the contradiction between device complexity and control flexibility.
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 enhances the optical performance by reducing dark spots and improving power efficiency, enabling high-quality images with enhanced contrast and reduced power consumption by allowing independent control of light intensity and duration across different regions of the display.
Implementation Method 1
The illumination engine may include an array of light-emitting diodes
Implementation Method 2
The conductive layer may be formed in a grid that defines a plurality of openings for the light-emitting diodes or may be formed around the periphery of the array
Data Source
AI summary
An electronic device may have one or more displays that produce images for a user. The display may include an array of light-emitting diodes. Each light-emitting diode in the array of light-emitting diodes may include a plurality of vias. The vias may be arranged in an array of rows and columns. The light-emitting diodes in the array may share a common cathode. The common cathode may include a conductive layer formed from a reflective material. The conductive layer may be formed in a grid that defines a plurality of openings for the light-emitting diodes or may be formed around the periphery of the array. The array may include light-emitting diodes of two different colors in a head-to-tail arrangement, connected in series, or that share a common cathode. The array may include light-emitting diodes of three different colors that are vertically stacked.