Backlight Assembly Unit Block LED Driving Circuit
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Solution Overview
Problem
The high manufacturing cost and complexity of the circuit for backlight assemblies used in liquid crystal display (LCD) devices, particularly due to the need for a number of driving elements equal to the number of LEDs in local dimming methods, increase the overall cost and complexity of the backlight assembly.
Innovation Solution
A backlight assembly is designed with multiple unit blocks, each containing a light-emitting part with two red, two green, and two blue LEDs, and a driving part with a single driving element for each color, along with a light-emitting control part to individually control each group of LEDs, reducing the number of driving elements required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If local dimming method is used with individual driving elements for each LED, then light control precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple LEDs of the same color are electrically connected in parallel to share a common driving element. Specifically, two red LEDs are connected in parallel to one red driving element, two green LEDs share one green driving element, and two blue LEDs share one blue driving element. This merging approach maintains individual LED control capability while reducing the total number of driving elements from six to three per unit block.
Solution Approach 2:
Each driving element is designed to control multiple LEDs of the same color, making the driving element universal for that color channel. The red driving element can drive either of the two red LEDs, the green driving element can drive either of the two green LEDs, and the blue driving element can drive either of the two blue LEDs, thereby reducing overall circuit complexity.
2Measurement precision
If local dimming method is used with individual driving elements for each LED, then light control precision is improved, but manufacturing cost increases
Solution Approach 1:
Multiple LEDs of the same color are electrically connected in parallel to share a common driving element. Specifically, two red LEDs are connected in parallel to one red driving element, two green LEDs share one green driving element, and two blue LEDs share one blue driving element. This merging approach maintains individual LED control capability while reducing the total number of driving elements from six to three per unit block.
3Illumination intensity
If number of LEDs is increased for high luminance, then illumination intensity is improved, but device complexity and cost increase
Solution Approach 1:
Multiple LEDs of the same color are electrically connected in parallel to share a common driving element. Specifically, two red LEDs are connected in parallel to one red driving element, two green LEDs share one green driving element, and two blue LEDs share one blue driving element. This merging approach maintains individual LED control capability while reducing the total number of driving elements from six to three per unit block.
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 reduces the number of driving elements needed, simplifies the circuit, and lowers manufacturing costs while maintaining effective light control for the LCD display.
Implementation Method 1
The light-emitting part includes two red light-emitting diodes (LEDs), two green LEDs and two blue LEDs
Data Source
AI summary
A backlight assembly includes a plurality of unit blocks to emit light. Each unit block includes a light-emitting part and a driving part. The light-emitting part includes at least two red light-emitting diodes (LEDs), two green LEDs, and two blue LEDs. The driving part includes a red LED-driving element that provides the red LEDs with a driving voltage, a green LED-driving element that provides the green LEDs with a driving voltage, and a blue LED-driving element that provides the blue LEDs with a driving voltage. LEDs may be driven together in a group, or may be driven individually to sequentially emit red light, green light, and blue light so a color filter is not included in a display panel having the backlight assembly. A driving element is connected to the LEDs to reduce manufacturing costs for the driving element circuits, thereby reducing manufacturing costs of the backlight assembly.