The subject matter herein generally relates to a holographic display.
A holographic device combines both holographic technology and waveguide technology to achieve superimposing a virtual image and an external scene image in a projected manner.
A head-mounted holographic device can be worn on user's head for showing a three-dimensional holographic image to the user. An image accuracy requirement of the head-mounted holographic display is much higher than that of the two-dimensional display (for example, TV, computer, etc.). Therefore, a coherence requirement and a narrow spectrum requirement for a light source of the holographic display are also much higher than those of the two-dimensional display. Low coherence or wide spectrum of the light source may reduce uniformity and sharpness of an image displayed by the head-mounted device. Therefore, there is room for improvement in the art.
Implementations of the present disclosure will now be described, by way of embodiment, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein may be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.
The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like.
This embodiment provides a holographic display device (holographic display device 10). Specifically, the holographic display device 10 is a head-mounted holographic display device. When the holographic display device 10 is worn on a user's head, a three-dimensional image can be presented.
Referring to
Referring to
The light source 21 of the present embodiment is configured to emit the first color light, the second color light, and a third color light. In the present embodiment, the first color light is blue light, the second color light is green light, and the third color light is red light. In other embodiments, the first color light, the second color light, and the third color light may be other colors. In another embodiment, the light source 21 may be configured to emit a fourth color light. The fourth color light may be white light.
Referring to
Referring to
In the present embodiment, each of the light-emitting elements 213 is a micro light-emitting diode (Micro-LED) for emitting the blue light (that is, the first color light). In other embodiments, each of the light-emitting elements 213 may be an organic light-emitting diode (OLED). A driving circuit may be provided on the substrate 212 to drive each of the light-emitting elements 213 to emit light.
Referring to
Referring to
In another embodiment, some of the light-emitting elements 213 emit the first color light, some of the light-emitting elements 213 emit the second color light, and the other of the light-emitting elements 213 emit the third color light, where the light source 21 does not include the color conversion layer 214.
Referring to
Referring to
Each of the first filter units 221 selectively transmits the blue light in a continuous first target wavelength range. Each of the second filter units 222 selectively transmits the green light in a continuous second target wavelength range. Each of the third filter units 223 selectively transmits the red light in a continuous third target wavelength range. The first color light from the light source 21 has a first wavelength range, the second color light from the light source 21 has a second wavelength range, and the third color light from the light source 21 has a third wavelength range. The first target wavelength range is less than the first wavelength range as emitted, the second target wavelength range is less than the second wavelength range, and the third target wavelength range is less than the third wavelength range. In the present embodiment, the first wavelength range, the second wavelength range, and the third wavelength range are reduced to 24 nm.
In the present embodiment, the first color light from the light source 21 has a first peak wavelength and a first center wavelength. The first peak wavelength and the first center wavelength are within the first target wavelength range. The second color light from the light source 21 has a second peak wavelength and a second center wavelength. Both the second peak wavelength and the second center wavelength are within the second target wavelength range. The third color light from the light source 21 has a third peak wavelength and a third center wavelength. The third peak wavelength and the third center wavelength are within the third target wavelength range.
Therefore, the coherence of the light source 21 is improved, which improves the display effect of the holographic display device 10.
It is to be understood, even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the plain meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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202010278061.X | Apr 2020 | CN | national |
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20170236866 | Lee | Aug 2017 | A1 |
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2014107616 | Jul 2014 | WO |
Number | Date | Country | |
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20210318551 A1 | Oct 2021 | US |