Light Source Optics for Color Temperature Alignment in Displays
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Solution Overview
Problem
Existing light source devices for image display apparatuses experience color tone shifts due to misalignment of optical elements, leading to degraded image quality.
Innovation Solution
A light source device with adjustable optical elements, including a dichroic mirror and wavelength converter, allows for alignment of focal positions of excitation beam and fluorescence, correcting color tone variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed optical elements are used in the light source device, then the device structure is simple, but the color temperature cannot be adjusted when misalignment occurs
Solution Approach 1:
The patent makes the optical elements (wavelength converter or dichroic mirror) adjustable rather than fixed, allowing dynamic repositioning to correct misalignment and adjust color temperature. This dynamic capability resolves the contradiction by enabling adaptation when color tone shifts occur.
Solution Approach 2:
The patent changes the positional parameters of optical elements to adjust the focal positions of excitation light and fluorescence on the light homogenizer. By adjusting these parameters, the system can correct color temperature deviations while maintaining a relatively simple overall structure.
2Reliability
If optical elements are precisely aligned during manufacturing, then image quality is high, but manufacturing precision requirements are extremely strict
Solution Approach 1:
The patent introduces adjustability for optical elements after assembly, allowing post-manufacturing alignment correction. This reduces the stringency of manufacturing precision requirements while ensuring reliable image quality through adjustable focal position alignment.
Solution Approach 2:
The patent enables feedback-based adjustment of optical element positions to correct color tone shifts. By allowing adjustment based on observed color temperature deviations, the system achieves high image quality stability without requiring extremely strict initial manufacturing precision.
3Ease of operation
If excitation beam and fluorescence focal positions are separated on the light homogenizer, then optical element misalignment is tolerated, but color tone shifts occur
Solution Approach 1:
The patent makes the focal positions adjustable by changing the position or orientation of optical elements. This allows the system to tolerate initial misalignment while maintaining accurate color temperature through subsequent adjustment, resolving the contradiction between tolerance and accuracy.
Solution Approach 2:
The patent adjusts the positional parameters of optical elements to align the focal positions of excitation light and fluorescence on the light homogenizer. This parameter adjustment enables the system to tolerate manufacturing variations while achieving accurate color temperature.
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
Ensures display of images with desired color temperature by aligning focal positions, irrespective of positional deviations in optical elements, maintaining high image quality.
Implementation Method 1
a phosphor layer to emit fluorescence having a wavelength different from a wavelength of the excitation beam
Implementation Method 2
a dichroic mirror to: transmit the fluorescence; and reflect the excitation beam
Implementation Method 3
a first condensing optical system having an optical axis to: transmit the excitation beam reflected from the dichroic mirror through one half of an optical effective surface of the first condensing optical system relative to the optical axis; and condense the excitation beam onto the wavelength converter
Data Source
AI summary
A light source device includes an excitation light source including: one or more light emitters to emit excitation light; and an optical element to convert the excitation light into an excitation beam; a wavelength converter; a dichroic mirror; a light homogenizer; a first condensing optical to condense the excitation beam onto the wavelength converter; a second condensing optical system to condense the excitation beam onto a first focal position on the incident surface of the light homogenizer; and condense the fluorescence onto a second focal position on the incident surface of the light homogenizer. At least one of a position or an orientation of one of the optical element of the excitation light source; the dichroic mirror; or the wavelength converter is adjustable to adjust the first focal position of the excitation beam and the second focal position of the fluorescence on the incident surface of the light homogenizer.