Backlight Driving Circuit for Precise LED Brightness Control
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Solution Overview
Problem
Conventional backlight driving circuits for LCD panels fail to accurately control the brightness of regions in an image, leading to poorer fineness and definition, as all LEDs in a lamp bar are turned on or off simultaneously, resulting in incorrect brightness levels in displayed images.
Innovation Solution
A backlight driving circuit with a switch control sub-circuit that allows individual LEDs to be turned on or off separately based on color information, dividing LEDs into groups corresponding to different brightness regions and controlling their emission duration and current to match the image's color information, thereby enabling precise brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all LEDs in a lamp bar are turned on or off simultaneously, then the control structure is simple, but the brightness control precision of regions in the displayed image deteriorates
Solution Approach 1:
The patent divides the backlight source into multiple independently controllable LED units or groups, replacing the conventional approach where all LEDs in a lamp bar are controlled simultaneously. This segmentation allows different regions of the display to have independent brightness control, thereby improving brightness control precision without significantly increasing overall system complexity.
Solution Approach 2:
The patent implements dynamic brightness control by adjusting the on/off state or brightness level of individual LED units or groups based on the actual display content requirements. This dynamic adjustment capability enables precise brightness control for different image regions while maintaining a relatively simple control structure through intelligent algorithms.
2Manufacturing precision
If individual LEDs are controlled separately to improve image fineness and definition, then the brightness control precision improves, but the device complexity increases
Solution Approach 1:
The patent merges the control of multiple individual LEDs into grouped control units, where adjacent LEDs with similar brightness requirements are controlled together. This merging approach reduces the number of independent control channels needed while still achieving fine-grained brightness control across different image regions, thereby balancing brightness control precision with device 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 solution ensures that regions in the displayed image are accurately brightened or darkened, enhancing the fineness and definition of the image by allowing for independent control of each LED's state and emission duration, improving the overall display quality.
Implementation Method 1
a light emitting diode (LED) can improve the color rendering ability of the panel and is relatively environment-friendly, and most LCDs use LEDs as their backlight sources
Data Source
AI summary
A backlight driving circuit of driving a backlight source, the backlight source comprising a plurality of LEDs arranged in an array, the backlight driving circuit comprising: a power source sub-circuit and a switch control sub-circuit, wherein the power source sub-circuit is electrically connected to the plurality of LEDs respectively through the switch control sub-circuit; and the switch control sub-circuit is configured to determine a to-be-turned-on LED and a to-be-turned-off LED according to color information of an image to be displayed, and control each of the LEDs to be turned on or off by controlling a connection state between each of the LEDs and the power source sub-circuit separately according to the determined to-be-turned-on LED and the determined to-be-turned-off LED. A backlight driving method, a backlight driving device and a computer-readable storage medium are further provided.