STEREOSCOPIC IMAGE DISPLAY DEVICE

• US 20190107728A1
• Filed: 03/17/2017
• Published: 04/11/2019
• Est. Priority Date: 03/24/2016
• Status: Active Grant

• Current Assignee: Kim Hung Yu, Sang S.U. Kim
• Original Assignee: Kim Hung Yu, Sang S.U. Kim
• Inventors: KIM, Sang Su
• Granted Patent: US 10,663,851 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• CPC Class Codes: G02B 30/25 using polarisation techniques
• CPC Class Codes: G02B 30/35 using reflective optical elements in the optical path between the images and the observer
• CPC Class Codes: G02B 30/36 using refractive optical elements, e.g. prisms, in the optical path between the images and the observer
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G03B 21/606 for relief projection
• CPC Class Codes: H04N 13/332 Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
• CPC Class Codes: H04N 13/337 using polarisation multiplexing
• CPC Class Codes: H04N 13/363 using image projection screens volumetric display H04N13/388

Abstract

The present invention relates to a stereoscopic image display through which after the incident light incident from a projector lens is split into different lights according to polarized components, by selectively delaying the phase of each split light by a predetermined value through an on/off operation of an optical switch module, each light is converted to have the same polarized component, and the synthesized light obtained by synthesizing the lights having the same polarized component is projected on a screen so as to double the luminance on the screen.

Claims

1. A stereoscopic image display device comprising:

a light splitter configured to split an incident light transmitted from a projector into a first polarized light and a second polarized light according to a polarization component and then transmit the first polarized light and reflect the second polarized light in at least one direction;

a first optical switch module configured to delay and output a phase of the first polarized light, or further delay the phase to convert the first polarized light into the second polarized light and output the converted second polarized light;

a second optical switch module configured to delay a phase of the second polarized light reflected in the at least one direction and output the second polarized light, or further delay the phase to convert the second polarized light into the first polarized light and output the converted first polarized light; and

a light reflection module configured to reflect the second polarized light reflected in the at least one direction from the light splitter toward a direction of the second optical switch module.

2. The device of claim 1, wherein the light splitter has at least one split surface corresponding to an incident angle of an incident light, and the light splitter has a specific pattern shape through the at least one split surface.

3. The device of claim 2, wherein at least a portion of the at least one split surface is coated with a reflective layer in correspondence to the incident angle of the incident light.

4. The device of claim 1, wherein the first and second optical switch modules have both-side end portions bent in a shape curved in one side direction.

5. The device of claim 1, wherein the first and second optical switch modules selectively output any one of the first polarized light and the second polarized light in synchronization with an image frame transmitted from the projector.

6. The device of claim 1, wherein the first optical switch module comprises:

a horizontally polarizing plate configured to linearly polarize the first polarized light in a horizontal direction;

a first liquid crystal (LC) panel configured to delay a phase of the linearly-polarized first polarized light by λ

/2 as a voltage corresponding to a first level is applied to convert the first polarized light into the second polarized light and output the second polarized light; and

a first phase delaying member configured to further delay the second polarized light by λ

/4 to output a circular polarized light.

7. The device of claim 6, wherein the first phase delaying member is a quarter wave delaying film.

8. The device of claim 6, wherein when a voltage corresponding to a first level is applied to the first LC panel, the first LC panel transitions to an on state, and when a voltage corresponding to a second level is applied, transitions to an off state.

9. The device of claim 8, wherein the first LC panel selectively outputs the first polarized light or the second polarized light depending on whether a voltage corresponding to the first level or the second level is applied.

10. The device of claim 1, wherein the second optical switch module comprises:

a vertically polarizing plate configured to linearly polarize the second polarized light in a vertical direction;

a second LC panel configured to delay a phase of the linearly-polarized second polarized light by λ

/2 as a voltage corresponding to a first level is applied to convert the second polarized light to the first polarized light and output the converted first polarized light; and

a second phase delaying member configured to further delay the second polarized light by λ

/4 to output a circular polarized light.

11. The device of claim 10, wherein the second phase delaying member is a quarter wave delaying film.

12. The device of claim 10, wherein when a voltage corresponding to a first level is applied to the second LC panel, the second LC panel transitions to an on state, and when a voltage corresponding to a second level is applied, transitions to an off state.

13. The device of claim 12, wherein the second LC panel selectively outputs the first polarized light or the second polarized light depending on whether a voltage corresponding to the first level or the second level is applied.

14. The device of claim 1, wherein when a first polarized light is outputted from the first optical switch module, the second optical switch module outputs a first polarized light converted from a second polarized light to synthesize each first polarized light, and

when a second polarized light converted from a first polarized light is outputted from the first optical switch module, the second optical switch module outputs a second polarized light to synthesize each second polarized light.

15. The device of claim 1, wherein any one of the light splitter and the light reflection module has a one-side end portion bent in a shape curved in a specific direction to superimpose an image focused on a screen by the first and second polarized light.

16. The device of claim 1, wherein any one of the light splitter and the light reflection module is tilted at a predetermined angle in a specific direction.