Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

2-dimensional image display device

A technology for display devices and two-dimensional images, applied in projection devices, optics, instruments, etc., to achieve simple production, reduce speckle noise, improve quietness and durability

Inactive Publication Date: 2007-01-10
PANASONIC CORP
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in this type of laser display, the problem is so-called speckle noise in which bright and dark dot patterns are randomly distributed due to the use of a highly coherent laser light source as the light source.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 2-dimensional image display device
  • 2-dimensional image display device
  • 2-dimensional image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0095] figure 1 is a diagram showing a schematic configuration of a two-dimensional image display device according to Embodiment 1 of the present invention.

[0096] figure 1 The illustrated two-dimensional image display device 100 includes: laser light sources 1a-1c corresponding to the three colors of RGB, and laser light sources La-Lc output from the laser light sources 1a-1c whose intensity is modulated according to the primary color signals Sa-Sc of the input image signal. light modulators 2a-2c. Among them, laser light sources 1a, 1b, 1c can use gas lasers such as He-Ne lasers, He-Cd lasers, Ar lasers, semiconductor lasers of AlGaInP type and GaN type, and SHG (second harmonic wave generation) lasers, etc.

[0097] In addition, the laser display 100 has a mirror 3 that reflects the laser light La modulated by the light modulator 2a, and a dichroic mirror 4a that synthesizes the laser light La reflected by the mirror 3 and the laser light Lb modulated by the light modu...

Embodiment approach 2

[0132] 5(a) and 5(b) are diagrams illustrating a two-dimensional image display device according to Embodiment 2 of the present invention. Fig. 5(a) is a plan view showing a birefringent diffusion sheet 7c constituting the two-dimensional image display device. 5( b ) shows the cross-sectional structure of the birefringent diffuser 7c, and schematically shows the phase distribution of the illumination light incident on the birefringent diffuser 7c and the illumination light emitted from the birefringent diffuser 7 .

[0133] In the two-dimensional image display device of the second embodiment, the birefringent diffusion sheet 7c in which the substrate thickness of the material having birefringence is randomly changed in space is used instead of the birefringent diffusion sheet 7 of the two-dimensional image display device 100 of the first embodiment. . Therefore, other configurations of this second embodiment are the same as those of the first embodiment.

[0134] The birefrin...

Embodiment approach 3

[0147] Figure 7 In order to explain the diagram of the two-dimensional image display device according to Embodiment 3 of the present invention, a speckle noise canceling optical system in the two-dimensional image display device is schematically shown.

[0148] The two-dimensional image display device according to the third embodiment is a device in which the polarization state modulator 6 and the birefringent diffusion sheet 7 c constituting the speckle noise canceling optical system according to the second embodiment are integrated. In addition, other configurations of the third embodiment are the same as those of the second embodiment.

[0149] The speckle noise cancellation optical system of the two-dimensional image display device according to Embodiment 3 is made of a single LiNbO 3 A system in which a polarization state modulator 6e for modulating the polarization state of the laser light Ld and a birefringent diffuser 7e for spatially changing the phase of the polari...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
Login to View More

Abstract

Provided is a two-dimensional image display device that reduces speckle noise with a simple structure. The two-dimensional image display device projects coherent light onto the projection surface for image display, has at least one coherent light source (1a), (1b), (1c) outputting coherent light, and analyzes the polarization state and phase of the coherent light from the coherent light source At least one polarization state modulator (6) for modulation and a birefringent diffuser (7) for spatially changing the phase of coherent light from the polarization state modulator, so that each pixel of the image displayed on the projection surface The polarization states of the light spots in , change spatially and temporally, forming various speckle patterns.

Description

technical field [0001] The present invention relates to a two-dimensional image display device, and in particular to reduction of speckle noise in a two-dimensional scanning type image display device using a coherent light source as a light source. Background technique [0002] FIG. 9 is a diagram showing a schematic structure of a conventional laser display. [0003] This laser display 900 has laser light sources 901a to 901c corresponding to the three colors of RGB and light modulators 905a to 905c that modulate the intensity of laser light La to Lc output from the laser light sources 901a to 901c according to the primary color signals Sa to Sc of the input image signal. . In addition, the laser display 900 has a mirror 903 that reflects the laser light La modulated by the light modulator 905a, and a dichroic mirror that synthesizes the laser light La reflected by the mirror 903 and the laser light Lb modulated by the light modulator 905b. 902a, a dichroic mirror 902b fo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00G02F1/01G03B21/14
CPCG03B21/00G02F1/0136G03B21/14G03B21/006G03B21/2073G03B21/208
Inventor 森川顕洋笠澄研一水内公典
Owner PANASONIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com