Micro LED Display with Light Conversion Layer for Local Dimming
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Solution Overview
Problem
Conventional LCD devices face challenges in achieving local dimming and reducing power consumption while maintaining a simple structure and low manufacturing costs, as they require complex local dimming control circuits and continuous backlight operation for black image display.
Innovation Solution
A flat display device with micro light-emitting semiconductor elements and a light conversion layer that generates white light by emitting blue and green light, which is then converted to achieve local dimming and power savings, featuring a simple structure and reduced manufacturing costs through the use of quantum dots or fluorescent particles in a paste material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a local dimming control circuit is used to partially turn off the backlight module, then power consumption is reduced and local dimming is achieved, but the structure becomes very complicated and manufacturing cost increases
Solution Approach 1:
The backlight module is divided into multiple independently controllable light-emitting regions, each corresponding to a specific display region. By segmenting the backlight into separate controllable units, the system can turn off specific regions to achieve local dimming and power savings without requiring a complex overall control circuit.
Solution Approach 2:
The invention uses the display panel's own pixel control capability to simultaneously control both the liquid crystal molecules and the corresponding backlight emission. The pixel control circuit serves dual functions: controlling liquid crystal orientation for image display and controlling backlight emission for local dimming, eliminating the need for a separate complex local dimming control circuit.
2Reliability
If the backlight module is continuously turned on to emit light, then the display can show images, but power consumption increases
Solution Approach 1:
Instead of continuous backlight operation, the system uses periodic or on-demand backlight emission controlled by the pixel circuit. The backlight is activated only when and where needed for display, reducing overall power consumption while maintaining display functionality through coordinated control of liquid crystal and backlight timing.
Solution Approach 2:
The invention maintains continuous display functionality by ensuring that when the backlight is turned off in certain regions, the liquid crystal molecules in those regions are simultaneously controlled to block light or maintain image display. This continuous coordinated action ensures display reliability while reducing power consumption through selective backlight shutdown.
3Illumination intensity
If a local dimming control circuit is used to achieve black image display, then local dimming is achieved, but manufacturing cost increases
Solution Approach 1:
The pixel control circuit is designed to perform multiple functions: controlling liquid crystal orientation for image display and controlling backlight emission for local dimming. This multi-functionality eliminates the need for separate local dimming control circuits, reducing manufacturing complexity and cost while maintaining local dimming capability.
Solution Approach 2:
The invention merges the backlight control function with the existing pixel control circuit. By combining these control functions into a single integrated system, the patent reduces the number of separate components and control circuits needed, thereby simplifying manufacturing and reducing costs while achieving local dimming.
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 display device effectively achieves local dimming and decreases power consumption by using micro light-emitting semiconductor elements and a light conversion layer, simplifying the structure and reducing manufacturing costs through easy material preparation and processing.
Implementation Method 1
The micro light-emitting semiconductor elements are disposed separately on the circuit substrate and configured corresponding to the sub-pixels. The light emitted from the micro light-emitting semiconductor element corresponding to each of the sub-pixels passes through the light conversion portion to generate white light.
Implementation Method 2
The light conversion layer has a plurality of light conversion portions disposed respectively corresponding to at least partial of the micro light-emitting semiconductor elements. The light emitted from the micro light-emitting semiconductor element corresponding to each of the sub-pixels passes through the light conversion portion to generate white light.
Data Source
AI summary
A display device has a plurality of sub-pixels, and includes a circuit substrate, a plurality of micro light-emitting semiconductor elements, a light conversion layer and an opposite substrate. The micro light-emitting semiconductor elements are disposed separately on the circuit substrate and configured corresponding to the sub-pixels. The light conversion layer has a plurality of light conversion portions disposed respectively corresponding to at least partial of the micro light-emitting semiconductor elements. The light emitted from the micro light-emitting semiconductor element corresponding to the sub-pixel passes through the light conversion portion to generate white light. The opposite substrate is disposed at one side of the light conversion layer away from the circuit substrate. In another display device, the light emitted from the micro light-emitting semiconductor element passes through the light conversion layer to generate white light.