Projection Display Apparatus with Selective LED Activation
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Solution Overview
Problem
Conventional projection display apparatuses consume high electric power due to always-on light sources, leading to excessive heat generation.
Innovation Solution
A projection display apparatus with a two-dimensionally arranged light emitting diode (LED) array panel that includes multiple groups of LEDs emitting different wavelengths, driven by selective driver elements, and a cooling section to minimize power consumption by only activating LEDs when necessary, along with an image synthesizing section to combine images from multiple panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light source is energized at all times to ensure continuous operation, then the projection display apparatus can immediately project images, but electric power consumption increases and heat generation becomes excessive
Solution Approach 1:
The light source is operated periodically rather than continuously. The control unit activates the light source only during periods when image projection is required, and deactivates it during periods of non-use. This periodic operation pattern significantly reduces overall power consumption while ensuring the light source is available when needed for projection operations
2Reliability
If a light source is energized at all times to ensure continuous operation, then the projection display apparatus can immediately project images, but heat generation becomes excessive
Solution Approach 1:
The light source operates periodically rather than continuously, generating heat only during active projection periods. This reduces cumulative heat generation and allows thermal management systems to more effectively dissipate heat between operation cycles, preventing excessive temperature buildup
3Illumination intensity
If conventional light sources are used to ensure sufficient brightness, then image projection quality is maintained, but the apparatus size and power consumption increase
Solution Approach 1:
The invention transitions from conventional light sources to light emitting diodes (LEDs), representing a fundamental change in the light source parameter. LEDs provide sufficient illumination intensity for high-quality image projection while consuming significantly less electric power, thus resolving the contradiction between brightness and power consumption
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 apparatus achieves significant power savings by only activating LEDs when needed, reducing heat generation and enabling a compact, high-definition projection display.
Implementation Method 1
The plurality of light emitting elements are light emitting diodes formed in the form of semiconductor thin films
Implementation Method 2
each semiconductor thin film including a number of light emitting diodes isolated from one another
Implementation Method 3
The image forming section includes a cooling section that cools the plurality of light emitting elements
Implementation Method 4
the semiconductor thin films being bonded to the substrate by intermolecular force
Data Source
AI summary
A projection display apparatus includes an image forming section that forms an image based on image information received from an external device, and a projection lens that projects the image formed by the image forming section. The projection display apparatus includes a substrate, a plurality of light emitting elements, a first driver and a second driver. The light emitting elements are two-dimensionally arranged on the substrate. The light emitting elements include rows of light emitting elements and columns of light emitting elements such that the rows are substantially perpendicular to the columns. The first driver element selectively drives the rows. The second driver element selectively drives the columns. The plurality of light emitting elements include three groups of light emitting elements aligned either in the rows or in the columns, each group emitting light of a different wavelength from the remaining groups.