Display Light Source Dimming Blocks for Thermal Management
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Solution Overview
Problem
Display devices face challenges in improving luminance while preventing temperature rises due to increased driving current, which can damage light sources.
Innovation Solution
A display device with a liquid crystal panel and light sources divided into dimming blocks, where a processor controls the current supply based on image data to reduce or increase current to dimming blocks, optimizing current distribution to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the intensity of light emitted by each light source is increased to improve luminance, then the luminance of the display device is improved, but the temperature of the display device increases and light sources may be damaged
Solution Approach 1:
The light sources are divided into multiple dimming blocks, allowing independent current control for each block. This segmentation enables selective illumination where only necessary blocks operate at high intensity, reducing overall heat generation while maintaining required luminance in specific display areas.
Solution Approach 2:
Different dimming blocks are assigned different current values based on local display requirements. Blocks corresponding to brighter image areas receive higher current, while blocks for darker areas receive lower current, optimizing luminance distribution and minimizing unnecessary heat generation in low-luminance regions.
2Power
If the driving current supplied to each light source is increased to improve luminance, then the luminance of the display device is improved, but the temperature of the display device increases and light sources may be damaged
Solution Approach 1:
The light sources are divided into multiple dimming blocks, allowing independent current control for each block. This segmentation enables selective illumination where only necessary blocks operate at high intensity, reducing overall heat generation while maintaining required luminance in specific display areas.
Solution Approach 2:
The driving current parameter is dynamically adjusted for each dimming block based on image data analysis. By changing current values selectively rather than uniformly, the system achieves required luminance while minimizing total power consumption and heat generation.
3Illumination intensity
If the value of driving current supplied to each light source is increased to improve luminance, then the luminance of the display device is improved, but the temperature of the display device increases and light sources may be damaged
Solution Approach 1:
The light sources are divided into multiple dimming blocks, allowing independent current control for each block. This segmentation enables selective illumination where only necessary blocks operate at high intensity, reducing overall heat generation while maintaining required luminance in specific display areas.
Solution Approach 2:
The processor analyzes image data to determine required luminance levels for different display areas and adjusts driving current accordingly. This feedback mechanism ensures light sources operate at appropriate intensity levels, preventing excessive heat accumulation that would reduce reliability and extend light source lifespan.
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 approach enhances luminance while effectively managing temperature, preventing damage to light sources and maintaining device performance.
Implementation Method 1
The light source includes, for example, a light-emitting diode (LED) or an organic LED (OLED)
Implementation Method 2
increasing the value of the driving current supplied to each of the plurality of light sources increases the temperature of the display device
Data Source
AI summary
A display device includes a liquid crystal panel; a plurality of light sources configured to emit light toward the liquid crystal panel, wherein the plurality of light sources are divided into a plurality of dimming blocks, each dimming block including one or more light sources; a driver configured to provide a current to each light source of the plurality of light sources; and a processor configured to: control the driver to provide the current to the one or more light sources included in each dimming block of the plurality of dimming blocks based on image data, obtain an average current value of currents provided to the one or more light sources included in each dimming block of the plurality of dimming blocks for a reference time based on the image data, and control the driver to provide a reduced current to the plurality of light sources based on at least one of a predetermined number of first dimming blocks or an arrangement of the first dimming blocks having the average current value being greater than or equal to a first reference current value.