LED Display Column Segmentation for Voltage and Power Reduction
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Solution Overview
Problem
Existing LED display apparatuses face challenges with high drive voltage requirements, increased cost, non-uniform luminance, and limited display applications due to serial and parallel connections of LEDs, which restrict the number of LEDs that can be used and result in higher power consumption.
Innovation Solution
The LED display apparatus features a power circuit with a constant current source, multiple LEDs serially-connected with a single first switching element and second switching elements parallel-connected to each LED, controlled by a control circuit to selectively turn on/off the switching elements, allowing for a display matrix circuit with parallel-connected LED circuits and sequential control of first switching elements and simultaneous control of rows of second switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple LEDs are serially-connected to meet display requirements, then the number of LEDs can be increased, but the drive voltage requirement increases and power consumption increases
Solution Approach 1:
The patent divides the LED array into multiple independently controllable columns, where each column contains LEDs that can be controlled separately. This segmentation allows the system to activate only the necessary columns for display, reducing overall power consumption while maintaining the ability to use a sufficient number of LEDs for the required display capacity.
Solution Approach 2:
The patent implements dynamic control of LED columns through switching elements that can individually turn on/off each column. This dynamic control enables the system to adjust power consumption based on display requirements, activating only the necessary columns rather than all LEDs simultaneously, thus resolving the contradiction between using many LEDs and consuming excessive power.
2Quantity of substance
If multiple LEDs are serially-connected to increase display capacity, then more LEDs can be used, but the drive voltage requirement increases leading to larger power source and increased cost
Solution Approach 1:
The patent segments the LED array into multiple columns with individual control, allowing the system to achieve high display capacity without requiring all LEDs to operate simultaneously at high voltage. This reduces the peak voltage requirements and simplifies the power source design, lowering both size and cost while maintaining the ability to use numerous LEDs for display capacity.
Solution Approach 2:
The patent changes the operational parameters by controlling columns dynamically rather than operating all LEDs continuously at high voltage. This parameter change approach allows the system to maintain high display capacity with lower voltage requirements during normal operation, reducing power source complexity and cost.
3Use of energy by moving object
If LEDs are parallel-connected to reduce drive voltage, then power source size can be reduced, but luminance uniformity deteriorates and power consumption increases
Solution Approach 1:
The patent segments the LED structure into columns with individual switching control, combining benefits of both serial and parallel connections. Each column can be controlled independently, allowing for uniform luminance through individual column management while maintaining lower drive voltage requirements compared to full serial connection, thus resolving the luminance uniformity issue while keeping voltage low.
Solution Approach 2:
The patent applies local quality control by enabling independent control of each column through switching elements. This allows different columns to be optimized individually for luminance uniformity while maintaining overall low drive voltage, addressing the luminance uniformity problem that plagues parallel connections without sacrificing the voltage advantage.
4Illumination intensity
If LEDs are connected in matrix array to eliminate serial and parallel connection drawbacks, then luminance uniformity and power consumption can be improved, but individual LED control is lost limiting display applications
Solution Approach 1:
The patent segments the matrix array into independently controllable columns, restoring individual control capability that was lost in traditional matrix connections. Each column can be controlled separately through switching elements, enabling versatile display applications while maintaining the luminance uniformity and power consumption benefits of matrix configuration.
Solution Approach 2:
The patent introduces dynamic control to the matrix array through switching elements that can individually activate or deactivate columns. This dynamic control capability restores the versatility needed for various display applications while preserving the advantages of matrix connection for luminance uniformity and power efficiency.
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 enables the use of a lower drive voltage, reduces power consumption, achieves uniform luminance, and allows for more versatile and universal display applications by individually controlling LEDs, thereby addressing the limitations of prior art.
Implementation Method 1
a constant current power source for supplying a constant current
Implementation Method 2
switching elements each parallel-connected to one of the LEDs, respectively, and turned on/off to display figures and the like
Data Source
AI summary
An LED display apparatus 1 in which at least multiple LEDs are serially-connected to a power circuit part having a constant current power source, each one of the LEDs has a switching element parallel-connected thereto, and a control circuit part is used to selectively turn on/off the switching elements to control the LEDs for a specific display, characterized by the fact that the apparatus comprises a display matrix circuit part 9 constituted by parallel-connecting to the power circuit part 8 multiple LED circuits 7a, 7b, 7c . . . consisting of multiple LEDs 2 . . . and a single first switching element 3a, 3b, 3c . . . serially-connected and second switching element 4 . . . each parallel-connected to one of the LEDs 2 . . . , and a control circuit part 10 turning on the first switching elements 3a . . . for a given time period (Ts) in sequence and turning on/off a row La, Lb, Lc . . . of multiple second switching elements 4 . . . extending across the LED circuits 7a . . . of the display matrix circuit part 9 in correspondence with the first switch 3a . . . being turned on.