Local Dimming Current Control for LED Gray-Level Precision
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Maintaining consistent brightness in light-emitting diodes in conventional display devices through increased driving current leads to issues with gray levels, resulting in poor image quality.
Innovation Solution
An electronic device with a local dimming unit generating dimming control signals, a current driving unit producing first and second currents based on these signals, and a light-emitting diode zone receiving these currents to adjust brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving current is increased to maintain the same brightness of light-emitting diodes, then the brightness is maintained, but the gray levels deteriorate resulting in poor image quality
Solution Approach 1:
The patent divides the light-emitting diode array into multiple zones with different driving current levels. By segmenting the display into regions that can be independently controlled, the system can maintain high brightness in certain areas while using lower currents in other areas, thereby preserving gray level precision and avoiding the trade-off between brightness and image quality.
Solution Approach 2:
The patent implements local dimming by applying different current levels to different spatial regions of the light-emitting diode array. This allows each local area to have optimized quality characteristics - high brightness where needed and preserved gray levels in other areas - rather than forcing a uniform current level across the entire display.
2Device complexity
If a single current level is used for all light-emitting diodes, then the device structure is simple, but the image display quality deteriorates due to gray level loss
Solution Approach 1:
The current driving unit is segmented into multiple current output channels, each capable of providing different current levels to different zones. This segmentation allows the system to maintain relatively simple control architecture while achieving multi-level current control for improved gray level precision in the displayed image.
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 brightness control, reducing gray level loss and improving image display quality.
Implementation Method 1
A light-emitting diode zone is configured to receive the driving signal and emit light according to the driving signal
Data Source
AI summary
An electronic device includes a local dimming unit, a current driving unit, and a light-emitting diode zone. The local dimming unit generates a dimming control signal according to a current control command. The current driving unit generates a driving signal with a first current or a second current according to the dimming control signal, wherein the second current is greater than the first current. The light-emitting diode zone receives the driving signal and emits light according to the driving signal.