Backlight LED Time-Section Control for Better Color Reproduction
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Solution Overview
Problem
Existing display devices face challenges in improving color reproduction characteristics and require a method to adjust light intensity from backlights efficiently, while also simplifying the circuit for light intensity control.
Innovation Solution
A display device with a backlight unit comprising a plurality of LEDs, a pixel controlling unit, a power driving unit, and a timing controlling unit that synchronizes the activation and intensity adjustment of LEDs using different directions and time sections to improve color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the intensity of light output from the backlight is adjusted to improve color reproduction characteristics, then the color reproduction is improved, but the circuit complexity for controlling LED intensities increases
Solution Approach 1:
The backlight LEDs are divided into multiple groups arranged in a matrix pattern (rows and columns). Each group can be independently controlled by separate driving circuits. This segmentation allows the system to control LED intensities in a structured manner, improving color reproduction while managing circuit complexity through modular organization of control lines.
Solution Approach 2:
The patent employs time-division multiplexing where different rows of LEDs are activated in sequential time sections. The power driving unit activates one row at a time, and the pixel controlling unit adjusts intensities for each time section. This periodic activation pattern enables independent intensity control for different LED groups without requiring simultaneous control of all LEDs, thus reducing overall circuit complexity while achieving improved color reproduction.
2Illumination intensity
If multiple driving circuits are used to control LED intensities in different directions, then color reproduction is improved, but the device complexity increases
Solution Approach 1:
The patent combines row control and column control functions into a unified matrix addressing system. The power driving unit controls row selection while the pixel controlling unit handles column-based intensity adjustment. By merging these control functions into a coordinated system that shares common timing and control signals, the patent achieves comprehensive LED intensity control for improved color reproduction while avoiding the complexity of completely independent driving circuits for each direction.
Solution Approach 2:
The pixel controlling unit serves multiple functions: it receives image data, controls column-based LED intensity adjustment, coordinates with the power driving unit for row selection, and manages timing for different time sections. This multi-functional design eliminates the need for separate dedicated circuits for each control function, reducing overall device complexity while maintaining the capability to improve color reproduction through directional LED control.
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
The solution enhances color reproduction characteristics by controlling LED intensities in specific time sections, reducing circuit complexity through time-sharing control, and improving the display device's overall performance.
Implementation Method 1
a backlight unit including a plurality of LEDs (Light Emitting Diodes)
Data Source
AI summary
A display device includes a backlight, a pixel controlling unit, a power driving unit, a source driving unit which transmits, to the pixel controlling unit, intensities of the LEDs connected to the pixel controlling unit, and a timing controlling unit. The pixel controlling unit adjusts, in a first time section, an intensity of a first LED based on a first intensity received from the source driving unit, wherein the first LED is connected to a first line which is activated by the power driving. The pixel controlling unit adjusts, in a second time section different from the first time section, an intensity of a second LED based on a second intensity received from the source driving unit, wherein the second LED is connected to a second line which is activated by the power driving unit.