WO2015090009A1 - 一种显示装置 - Google Patents
一种显示装置 Download PDFInfo
- Publication number
- WO2015090009A1 WO2015090009A1 PCT/CN2014/078926 CN2014078926W WO2015090009A1 WO 2015090009 A1 WO2015090009 A1 WO 2015090009A1 CN 2014078926 W CN2014078926 W CN 2014078926W WO 2015090009 A1 WO2015090009 A1 WO 2015090009A1
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- WIPO (PCT)
- Prior art keywords
- laser
- light source
- display
- module
- display device
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/324—Colour aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/327—Calibration thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/334—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using spectral multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
Definitions
- the present invention belongs to the field of display technologies, and in particular, to a display device. Background technique
- Spectral separation technology is a relatively advanced stereo display technology, which is embodied in 3D display devices.
- the 3D display device comprises: a display light source, wherein the display light source uses two or more sets of laser light sources separated by spectrum, and the peak wavelengths of the same color laser light emitted by each group of laser light sources are different.
- each set of laser light sources includes three single primary color lasers, that is, a red light laser, a blue light laser, a green light laser, and two of the two sets of laser light sources are of the same color.
- the peak wavelength of the laser emitted by the primary laser is different.
- the red light emitted by the two red lasers is red laser 1 and red laser 2, respectively
- the green light emitted by the two green lasers is green laser 1 and green laser 2, respectively, and two blue lasers.
- the blue light emitted is blue laser 1 and blue laser 2, respectively.
- the image composed of red laser 1, green laser 1 and blue laser 1 enters one eye of the person, red laser 2.
- the image composed of the green laser 2 and the blue laser 2 enters the other eye of the person, thereby forming a stereoscopic image.
- a device for receiving a red laser, a green laser, and a blue laser obtained after spectral separation is a narrow-band filter glasses.
- the biggest difference between the spectral separation stereo imaging technology and the traditional stereo imaging technology is that it uses the spectral separation method to achieve the high separation of the left and right eye stereo images, and separates the images according to the wavelengths of different color lights. There is no signal conversion process.
- the spectral separation display technology has the following advantages: 1.
- the left and right stereo image pairs are strictly filtered and highly separated, and there is no ghost phenomenon when wearing glasses to view stereoscopic images; 2.
- the image quality is good, no flickering , good comfort, no dizziness for long-term viewing;
- glasses do not need to be equipped with electricity
- the source and the complicated circuit, the glasses are light, so the comfort is better; 4.
- the signal synchronization transmitter is not needed, the head can be moved freely, and the wearer does not interfere with each other, which can satisfy a large number of audience applications.
- a set of single primary color lasers is required.
- the lasers ie, red laser 1 and red laser 2, green laser 1 and green laser 2, blue laser 1 and blue laser 2
- six single-primary lasers that is, a single-primary laser corresponds to a peak.
- the wavelength of the laser is bulky and costly.
- the technical problem to be solved by the present invention includes providing a compact and relatively low cost display device for the problems of the existing 3D display device.
- a technical solution for solving the technical problem of the present invention is a display device comprising: a display light source, the display light source comprising at least one wavelength tunable single primary color laser, the single primary color displayed when displaying each 3D picture
- the laser is capable of emitting at least a first laser at a first time and a second laser at a second time, and the first laser is different from a peak wavelength of the second laser, wherein the first time and the first The two moments are continuous, the first laser is used to display the first frame picture, and the second laser is used to display the second frame picture.
- the single primary color laser in the display device of the present invention can emit the first laser at the first moment and the second laser at the second moment, and the peak wavelengths of the first laser and the second laser are different, so that it has two needs with the existing one.
- the display device of the present embodiment has a more compact structure and reduces the production cost as compared with a display light source that emits two peak wavelengths of the same color laser at two adjacent moments.
- the display source comprises three wavelength-tunable single-primary lasers, each of which is a red laser, a green laser, and a blue laser.
- the first laser includes a first red laser, a first green laser, and a first blue a laser, wherein at the first moment, the red laser emits a first red laser, the green laser emits a first green laser, and the blue laser emits a first blue laser;
- the second laser includes a second red laser, a second green laser, and a second blue laser, wherein at the second moment, the red laser emits a second red laser, and the green laser emits a second green laser.
- the blue laser emits a second blue laser.
- the display light source further includes: a signal generating module, a laser driving module, and a controller,
- the controller controls the signal generating module to generate different current signals, the signal generating module provides the different current signals to the laser driving module, and the laser driving module generates according to different received current signals. Different driving currents are used to drive the corresponding single primary color laser to emit the first laser or the second laser.
- the display light source further includes: a monitoring module, wherein the monitoring module is connected to the corresponding single primary color laser for detecting a peak wavelength of the laser light emitted by the single primary color laser, and the monitoring module The peak wavelength of the first laser or the second laser is fed back to the controller to adjust the current output of the laser drive module.
- the display light source further includes: an automatic control module, wherein the monitoring module feeds back a peak wavelength of the first laser or the second laser to the controller through the automatic control module to adjust the laser driving module Current output.
- the display light source further includes: a coupler
- the single primary color lasers are respectively connected to the coupler through an optical fiber, and are configured to transmit the first laser light or the second laser light emitted at the same time to the display module via the coupler via the same propagation path, so that the display device Display the image.
- the display light source further includes: a projection module, the projection module is disposed between the coupler and the display module, configured to process laser light output through the coupler, and project on The display module On, to display the target screen.
- a projection module the projection module is disposed between the coupler and the display module, configured to process laser light output through the coupler, and project on The display module On, to display the target screen.
- the display light source further comprises: at least one scattering rod and a light guide plate,
- the scattering rod is used to diffuse laser light from the coupler and form a surface light source through the light guide plate.
- the display light source further comprises a reflective lamp cover
- the scattering bar comprises: a scattering rod cavity, and scattering particles disposed in the scattering rod cavity, and a laser inlet is disposed at one end of the scattering rod cavity, The other end is provided with a reflective sheet disposed on a side of the scattering rod cavity facing away from the light guide plate, and the reflective sheet cooperates with the emitting lamp cover to reflect the laser light onto the light guide plate.
- the display light source is an array of laser light sources.
- the laser light source array includes a spaced red laser light source, a green laser light source, and a blue laser light source, and the red laser light source, the green laser light source, and the blue laser light source each include at least one laser light. . DRAWINGS
- FIG. 1 is a schematic view of a rear projection type display device according to Embodiment 1 of the present invention
- FIG. 2 is a schematic view showing a liquid crystal display device according to Embodiment 1 of the present invention
- FIG. 3 is a schematic diagram of a laser output according to Embodiment 1 of the present invention
- Figure 4 is a schematic view of a coupler of Embodiment 1 of the present invention.
- Figure 5 is a structural view of a display light source according to Embodiment 1 of the present invention
- Figure 6 is a cross-sectional view of Figure 5 of Embodiment 1 of the present invention
- Figure 7 is a structural view showing a scattering rod of Embodiment 1 of the present invention.
- Figure 8 is a structural view showing another display light source according to Embodiment 1 of the present invention
- Figure 9 is a schematic view showing a laser light source array according to Embodiment 1 of the present invention.
- the reference numerals are: 101, red laser; 102, green laser; 103, blue laser; 104, coupler; 105, projection module; 106, optical fiber; 107, scattering rod; 108, interface; 109, light guide; 110, reflector lampshade; 111, scattering rod cavity; 112, scattering particles; 113, reflective sheet; 114, LED light source array; Diffuser; 116, optical diaphragm; 117, red laser source; 118, green laser source; 119, blue laser source. detailed description
- the embodiment provides a display device, comprising: a display light source, wherein the display light source comprises at least one wavelength tunable single primary color laser, and the single primary color is displayed when displaying each 3D picture.
- the laser is capable of emitting at least a first laser at a first time and a second laser at a second time, and the first laser is different from a peak wavelength of the second laser, wherein the first time and the first The two moments are continuous, the first laser is used to display the first frame picture, and the second laser is used to display the second frame picture.
- the single primary color laser of the display light source in this embodiment can emit the first laser at the first moment and the second laser at the second moment, that is, a single primary laser can emit two peak wavelengths at two adjacent moments.
- the display device of the present embodiment has a more compact structure and lowers the production cost as compared with the conventional display light source that requires two single primary color lasers to emit two peak wavelengths of the same color laser at two adjacent timings.
- the display device provided in this embodiment needs to be viewed with corresponding narrow-band filter glasses when implementing 3D display
- the lens of the narrow-band filter glasses is a filter having a band-pass function for a specific wavelength.
- it is a filter having a band pass function for three colors of red, green and blue, in particular, a filter having a narrow band pass function for a spectrum of a specific band of red, green and blue, and is usually composed of a notch filter.
- the 3D picture can be viewed only with the narrow-band filter glasses described above.
- the display light source of the embodiment comprises three wavelength tunable single primary color lasers, and the three single primary color lasers include a red laser 101, a green laser 102 and a blue laser 103.
- the red laser 101 launch a red laser
- the green laser 102 emits a first green laser
- the blue laser 103 emits a first blue laser
- the first red laser, the first green laser, and the first blue laser are used to display the first frame
- the red laser 101 emits a second red laser
- the green laser 102 emits a second green laser
- the blue laser 103 emits a second blue laser
- the second green laser and the second blue laser are used to display the second frame picture.
- the first frame picture and the second frame picture respectively enter the left and right eyes of the viewer to form a three-dimensional picture.
- any one or both of the red laser 101, the green laser 102, and the blue laser 103 in the display source is used to be wavelength-tunable single-primary lasers.
- the structure of the display device is compacter than that of the conventional 3D display device, and the cost is low.
- the display light source further includes: a signal generating module, a laser driving module, and a controller, wherein the controller controls the signal generating module to generate different current signals, and the signal generating module will be different a current signal is provided to the laser driving module, the laser driving module generates different driving currents according to the received different current signals, and is configured to drive the corresponding single primary color laser to emit the first laser or the first Two lasers. That is to say, according to different driving currents, lasers of different peak wavelengths are emitted.
- the display source includes a wavelength tunable red laser 101, a green laser 102, and a blue laser 103.
- the red laser 101 emits a first red laser.
- the green laser 102 emits a first green laser
- the blue laser 103 emits a first blue laser
- the first red laser, the first green laser, and the first blue laser are used to display a first frame of the image;
- the red laser 101 emits a second red laser
- the green laser 102 emits a second green laser
- the blue laser 103 emits a second blue laser
- the second red laser and the second green laser The second blue laser is used to display the second frame picture.
- the first frame picture and the second frame picture are the same angles of the same picture, and the narrow-band filter glasses enter the left and right eyes of the viewer, respectively, so that a three-dimensional picture is formed.
- the principle of tunable peak wavelength of laser light emitted by a single primary color laser will be specifically described below.
- semiconductor materials have an extremely wide gain bandwidth, for example
- InGaAsP/InP materials have a bandwidth of 50 nm and a quantum well material of 250 nm, so theoretically, semiconductor lasers can be adjusted within this range.
- the wavelength corresponding to the refractive index and maximum gain of the semiconductor material is easily changed by changes in temperature, pressure, carrier concentration, and electric field strength. Among them, relying on changing the carrier concentration is the most common method for wavelength tuning.
- Monolithic tunable semiconductor lasers have two structures, one based on Bragg reflection gratings, such as multi-band DBR, multi-electrode DFB, and the like. Their wavelength tuning principle is mainly achieved by changing the refractive index of the grating reflection region, and then changing the Bragg wavelength.
- the maximum wavelength tuning range is limited by the maximum variation range of the refractive index of the grating region. At present, the maximum tuning range that such lasers can achieve by current injection is 10 nm. Within the cavity of this type of laser there is a grating for frequency selection and tuning.
- Another type of coupling cavity or non-matching grating changes the relationship between wavelength variation and carrier concentration variation, greatly extending the tuning range.
- vertical coupling filter type, super structure grating DBR, Y cavity laser, etc. their tuning range can reach tens to 100 nanometers.
- the corresponding speed of other lasers is extremely short, far d, the corresponding speed of the projection system.
- the wavelength of the laser emission wavelength is extremely narrow, the wavelength is in a small range. Tuning basically has no effect on the emission intensity, or even minor fluctuations will not affect the final viewing.
- the basic principle of wavelength adjustment is that the refractive index of the semiconductor material changes with the difference in carrier concentration (current is different). There are three factors that change the refractive index with current concentration: 1.
- the band filling effect that is, as the injected carriers increase, the Fermi level (Ef) of the conduction band and the valence band move to the high energy direction, which is equivalent to The band gap width is increased;
- a multi-electrode DBR-LD tunable semiconductor laser As an example, its structure is generally divided into three regions: a gain region, a phase shift region, and a mode selection grating.
- the Bragg distribution feedback grating selects a single longitudinal mode, and the gain region is used to adjust the output power.
- the wavelength tuning range can be expressed by the following formula:
- ⁇ is the grating period, which is the effective refractive index change of the grating region
- ⁇ is the mode limiting factor
- ⁇ is the refractive index change caused by the unit carrier concentration
- ⁇ is the radiation composite coefficient
- ⁇ is the injection current density
- the wavelength tuning range is also related to the composition of the waveguide layer. The closer the wavelength ⁇ of the component is to the lasing wavelength, the larger the tuning range.
- the semiconductor materials of the red region are: GaAlAs/GaAs, InGaP/GaAsP, InGaAlP.
- the laser in the green band is more difficult to obtain.
- the methods for generating the green laser are as follows: 1. Using the frequency-doping of the Nd-doped laser, this is the most commonly used method for obtaining a green laser. The efficiency of such a laser is still Low, bulky, expensive, temperature sensitive, and therefore not suitable for widespread deployment in high volume applications; 2. InGaN semiconductor lasers on non-polarized and semi-polarized GaN substrates, currently such lasers can be continuous The output wavelength is extended to a green light region of 520 ⁇ 525 nm; 3.
- VECSEL vertical external-cavity surface-emitting laser
- VECSEL vertical external-cavity surface-emitting laser
- the display light source further includes: a monitoring module, the monitoring module is connected to the corresponding single primary color laser for detecting a peak wavelength of the laser light emitted by the single primary color laser, and the monitoring module feeds back the peak wavelength of the first laser or the second laser Give the controller to adjust the current output of the laser driver module.
- the monitoring module detects whether the peak wavelength of the first laser or the second laser emitted by the single primary laser meets the peak wavelength required for the image to be displayed, and feeds back to the controller the bias current signal of the laser, and then passes the laser.
- the driver adjusts the drive current to control the peak wavelength of the laser emitted by the single primary laser.
- the display light source further includes: an automatic control module, wherein the monitoring module feeds back a peak wavelength of the first laser or the second laser to the controller through the automatic control module to adjust the laser driving module Current output.
- the display light source is further provided with a protection circuit, and the protection circuit is connected with the laser driving module for protecting the laser driving module, and providing corresponding horse area electrokinetic power for the single primary color laser;
- the display light source further includes: a coupler 104, wherein the single primary color laser is connected to the coupler 104 through a corresponding optical fiber 106, respectively, for using the first laser or the second laser emitted at the same time.
- a laser beam is synthesized via the coupler 104 and coupled to the display module via an optical fiber 106 for the display device to display an image.
- the input light 1, the input light 2, and the input light 3 are respectively input to the coupler 104 through three different optical fibers 106, and then synthesized by the coupler 104, and output through an optical fiber 106.
- the coupler 104 is generally a wavelength division multiplexer.
- the input light 1, the input light 2, the input light 3 (that is, the laser light emitted by each single primary color laser) have a narrow band spectrum characteristic, and the first frame picture and the second frame picture formed by the laser light emitted in the adjacent time period The corresponding spectra do not overlap or overlap very little, and crosstalk is not easily generated.
- the display device in this embodiment may be a rear projection system.
- the display light source further includes: a projection module 105 , wherein the projection module 105 passes through an optical fiber 106 and the coupler
- the 104 connection is configured to process a laser beam outputted through the coupler 104 and project a corresponding picture. That is, the screen to be displayed is projected onto a screen by the projection module 105, and the light is reflected into the eyes of the user, which can be applied to the projection apparatus.
- the display device in the embodiment may be a rear projection display device, similar to the principle of FIG. 1 described above, except that the laser light from the coupler 104 is directly directed to the display device of the display device via the projection device. At this point, you can view the corresponding video screen.
- the display device in this embodiment may be a liquid crystal display device, and the display light source is a backlight module in the liquid crystal display device. Further preferably, the display light source further includes: at least one scattering bar 107 and a light guide plate 109, the scattering rod 107 is connected to the coupler 104 via an optical fiber 106 for diffusing laser light from the coupler 104 and forming a surface light source through the light guide plate 109.
- the scattering rod 107 When the scattering rod 107 is one, the scattering rod 107 can be disposed at the side of the light-emitting surface of the light guide plate 109, which is equivalent to the side-in type backlight module; when the scattering rod 107 is plural, this All the scattering rods 107 can be connected together on the side facing away from the light-emitting surface of the light guide plate 109, which is equivalent to the direct-lit backlight module.
- the light source improves the utilization of light, which in turn makes the display device display better. As shown in FIG.
- the scattering rod 107 comprises: a scattering rod cavity, and scattering particles 112 disposed in the scattering rod cavity, and is disposed at one end of the scattering rod cavity for
- the optical fiber 106 is connected to the interface 108, and the other end thereof is provided with a reflective sheet 113.
- the side of the scattering cavity facing away from the light guide plate 109 is wrapped by the reflector 110, and the reflective sheet 113 cooperates with the reflector 110 for The laser light is reflected onto the light guide plate 109.
- the scattering particles 112 in the scattering rod cavity scatter light, and the scattering lamp cover half-wrapped the scattering rod cavity and cooperates with the reflection sheet 113 disposed at one end of the scattering rod 107 opposite to the optical fiber 106 interface 108.
- the light is reflected off the scattering rod 107 and disposed on the side of the light guide plate 109.
- the scattering particles 112 are acrylic particles, and may of course be other materials having scattering ability.
- the display light source structure is not unique.
- the display light source is a laser light source array 114
- the laser light source array 114 includes a red laser light source 117, green.
- the laser light source 118, the blue laser light source 119, and the red laser light source 117, the green laser light source 118, and the blue laser light source 119 each include at least one laser light.
- a diffusing plate 115 is disposed above the laser light source array 114 for diffusing light from the laser light source array 114, so that the transmitted light is diffused, increasing the light-emitting angle, and passing through the diffusing plate 115 and the optical film.
- Sheet 116 emits light.
- the laser array is used as a display light source, which is similar to the position of the scattering rod 107, and can be disposed on a side of the light guide plate 109 facing away from the light emitting surface, that is, a direct type display light source, and can be disposed on the light guide plate 109.
- a direct type display light source that is, a direct type display light source
- the red laser light source 117, the green laser light source 118, and the blue laser light source 119 are both wavelength tunable, and the wavelength adjustment can be realized by current adjustment.
- the implementation manner is the above embodiment. The method described is not described here. Of course, it is not limited to the red laser source 117, the green laser source 118, the blue laser source 119, or the laser source of other colors, as long as the wavelength is tunable.
- both the rear projection display device and the display light source of the liquid crystal display device are compact in structure and low in cost. While an exemplary embodiment is employed, the invention is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. These modifications and improvements are also considered to be within the scope of the invention.
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- Spectroscopy & Molecular Physics (AREA)
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Abstract
Description
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Priority Applications (1)
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US14/426,004 US9900589B2 (en) | 2013-12-20 | 2014-05-30 | Display device |
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CN201310718373.8 | 2013-12-20 | ||
CN201310718373.8A CN103716614B (zh) | 2013-12-20 | 2013-12-20 | 一种显示装置 |
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CN104052989B (zh) * | 2014-05-29 | 2015-12-02 | 合肥京东方光电科技有限公司 | 一种光谱变换装置、立体显示系统 |
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CN103716614A (zh) | 2014-04-09 |
CN103716614B (zh) | 2016-01-13 |
US9900589B2 (en) | 2018-02-20 |
US20160014399A1 (en) | 2016-01-14 |
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