CN118276324A - Image generation device, head-up display system and image display method - Google Patents

Abstract

The invention discloses an image generating device, a head-up display system and an image display method. Comprises a backlight unit and a display unit; the backlight unit is used for providing a color backlight light source for the display unit; the display unit is configured to display black-and-white image elements corresponding to the color image elements of the color backlight light source; the backlight unit comprises a laser light source, a scanning part and an imaging part; the laser light source emits a color image beam to the scanning part; the scanning part modulates laser and scans the laser beam in at least two directions of a plane of the imaging part to form a color image element in the imaging part; the imaging part is arranged opposite to the display unit and emits image beams of the color image elements to the display unit; the imaging part emits an image beam of a color image element emitted to the display unit and an image beam of a black-and-white image element displayed by the display unit to form a target image beam, and emits the target image beam to an imaging device of the head-up display system. The backlight has high light efficiency and high image definition, and can avoid the phenomenon of screen burning.

Description

Image generation device, head-up display system and image display method

Technical Field

The present invention relates to the field of display technologies, and in particular, to an image generating device, a head-up display system, and an image display method.

Background

The Head Up Display (HUD) technology refers to that light rays emitted by an image generating unit (Picture Generation Unit, PGU) are finally projected onto an imaging component (such as an imaging plate and a windshield) through reflective optical design, so that a driver can directly see information such as speed per hour and navigation without lowering the head while observing the real environment outside the windshield, driving safety coefficient is improved, and better driving experience can be brought.

The PGU acts as a core component in the HUD for generating images, and its imaging performance directly affects the product performance of the HUD. In some HUD products today, PGUs are mainly implemented based on these several technologies: liquid crystal display (Liquid CRYSTAL DISPLAY, LCD), digital light Processing (DIGITAL LIGHT Processing, DLP), liquid crystal on silicon (Liquid Crystal On Silicon, LCOS), laser beam scanning (Laser Beam Scanning, LBS), with LCD and LBS being most widely used.

However, although LCD technology is relatively mature and has low cost and can achieve advantages such as up to 1200 contrast, there are many problems in practical application due to the imaging principle of LCD, such as: providing backlight based on area array illumination, resulting in high backlight power; since the LCD has a structure of many micrometers, it is easily diffracted, resulting in poor color expression; two polarizers and Color Filters (CF) are arranged, resulting in low light transmittance; and the problems of low light reflectivity, high absorptivity, easiness in sunlight backflow, screen burning, low color gamut and the like exist.

The LBS has advantages of high brightness, small volume, etc., but the problems of speckle are caused by using a laser light source as a light emitting source. And the LBS technology is relatively unripe at present, so that the subsequent research and development cost is high, and the mass production risk exists.

Disclosure of Invention

The invention provides an image generating device, a head-up display system and an image display method, which are used for solving the problems that in the existing relatively mature image generating unit technical scheme, imaging effect is influenced, cost is high, and damage is easy to occur due to the limitation of using devices, structures and the like in the technology.

According to an aspect of the present invention, there is provided

An image generating device for a head-up display system, comprising a backlight unit and a display unit; the backlight unit is used for providing a color backlight light source for the display unit; the display unit is configured to display black-and-white image elements corresponding to color image elements of the color backlight light source;

the backlight unit comprises a laser light source, a scanning part and an imaging part;

The laser light source emits color image beams corresponding to laser to the scanning part;

The scanning part modulates the laser and emits a laser beam, and scans the laser beam in at least two directions of a plane where the imaging part is located so as to form the color image element in the imaging part;

The imaging part is arranged opposite to the display unit, and the imaging part emits image light beams of the color image elements to the display unit;

the imaging part emits an image beam of a color image element of the display unit and an image beam of a black-and-white image element displayed by the display unit to form a target image beam, and emits the target image beam to an imaging device of the head-up display system;

Wherein at least two directions of the scanning part include a first direction and a second direction, the first direction and the second direction intersecting.

Optionally, the display unit is configured as a black and white display unit.

Optionally, the laser light source includes a red laser light source, a green laser light source, and a blue laser light source, and a polarization direction of the laser light source is identical to a polarization direction of the display unit.

Optionally, the liquid crystal display screen includes a first area and a second area;

the first region and the second region each include a plurality of pixels; each of the plurality of pixels comprises a pixel electrode and a liquid crystal layer;

The pixel electrode of the first region controls the liquid crystal layer to be in a first state so as to transmit the red laser light, the green laser light and the blue laser light; the pixel electrode of the second region controls the liquid crystal layer to be in a second state to block the red laser light, the green laser light, and the blue laser light. The first area may include a plurality of pixel points with continuous position arrangement, or may include a plurality of pixel points with discontinuous position arrangement, and similarly, the second area may also include a plurality of pixel points with continuous position arrangement, or may include a plurality of pixel points with discontinuous position arrangement, which is determined according to the image element to be displayed.

Optionally, the backlight unit further includes a beam combining part;

the beam combining part is arranged between the laser light source and the scanning part;

the beam combining part is used for combining the red laser emitted by the red laser source, the green laser emitted by the green laser source and the blue laser emitted by the blue laser source.

Optionally, the beam combining part includes a first reflecting unit and a second reflecting unit;

The first reflecting unit is arranged on the light paths of the red laser and the green laser; the second reflecting unit is arranged on the light path of the blue laser; the first reflecting unit and the second reflecting unit are arranged in parallel along a third direction; the first reflecting unit and the second reflecting unit have a first preset included angle with the third direction;

the first reflecting unit transmits the red laser to the second reflecting unit and reflects the green laser to the second reflecting unit; the second reflection unit reflects the red laser and the green laser, transmits the blue laser, and combines the beams.

Optionally, the beam combining part further comprises a third reflecting unit; the third reflecting unit is arranged in parallel with the first reflecting unit and the second reflecting unit along the third direction;

the third reflection unit reflects the red laser light to the first reflection unit.

Optionally, the beam combining part includes a first body bragg grating and a second body bragg grating;

The first body Bragg grating is arranged on the light paths of the red laser and the green laser; the second volume Bragg grating is arranged on the light path of the blue laser; the first body Bragg grating and the third direction have a second preset included angle; the second body Bragg grating has a third preset included angle with the third direction;

The first bulk Bragg grating transmits the red laser and the green laser to the second bulk Bragg grating; and the second volume Bragg grating reflects the red laser and the green laser, transmits the blue laser and performs beam combination.

Optionally, the beam combining part includes an ion doping process device.

Optionally, the backlight unit further includes a collimation portion; the collimating part is arranged on an optical path between the laser light source and the beam combining part and is used for collimating the laser and emitting the collimated laser to the beam combining part.

Optionally, the scanning portion comprises a microelectromechanical system.

According to another aspect of the present invention, there is provided a head-up display system, including a filtering device, a reflecting device, and an imaging device, and any of the image generating devices according to the embodiments of the present invention;

The reflecting device comprises a reflecting mirror; the filter device is arranged on a light path of the image light beam emitted by the image generating device and used for transmitting light rays with the same wavelength as the laser light beam emitted by the laser light source;

The image generating device emits the image light beam to the filtering device, the filtering device transmits the image light beam to the reflecting device, the reflecting device reflects the image light beam to the imaging device, and the imaging device reflects the image light beam to human eyes to form virtual images.

Optionally, the head-up display system further comprises a light splitting device;

The light splitting device is arranged on a light path of the image generating device for emitting the image light beam and is used for deflecting the image light beam.

Optionally, the spectroscopic device comprises a lenticular grating.

According to still another aspect of the present invention, there is provided an image display method for use in the image generating apparatus or head-up display system provided by the present invention;

the image display method comprises the following steps:

Acquiring an image corresponding to the image light beam;

Judging whether each display element in the image has two color intersections;

If yes, acquiring one of the two colors in a display area of the liquid crystal display screen, and controlling the pixels of the display area to be turned off or controlling the gray values of the pixels of the display area corresponding to the two colors in the liquid crystal display screen to be different.

According to the technical scheme, the laser source is used for emitting laser to the scanning part, the laser is modulated by the scanning part and emitted into laser beams, the laser beams are scanned in at least two directions of a plane where the imaging part is located, the imaging part homogenizes the laser beams and images the laser beams, then the laser beams are emitted to the liquid crystal display screen, and the liquid crystal display screen modulates the brightness of the transmitted light according to the formed images so as to realize imaging. According to the technical scheme provided by the embodiment of the invention, the laser light source is used for emitting laser, so that the imaging brightness can be effectively improved, the color gamut is higher, the image resolution is positively correlated with the laser modulation frequency, and the laser is used as the light source, so that the imaging resolution can be further improved. The laser has good monochromaticity, color representation of imaging can be ensured, the laser also has strong directivity, the light efficiency of the image generating device is higher, the scanning part scans laser beams in at least two directions of the light homogenizing part, the light homogenizing part can meet higher space arrangement requirements, the light homogenizing part homogenizes the laser beams to form an area array backlight similar to that required by the existing liquid crystal display technology, the laser has color without filtering by using a color filter, the light transmittance is further improved, the imaging effect of the image generating device is improved, and the imaging of the backlight taking the laser as a light source is carried out through the liquid crystal display screen.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art LCD;

FIG. 2 is a schematic diagram of an LBS PGU in the prior art;

Fig. 3 is a schematic structural diagram of a first image generating apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first head-up display system according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a display unit according to an embodiment of the present invention;

FIG. 6 is a schematic diagram showing the relative positions of a LCD and a scanning unit according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second image generating apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a second head-up display system according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a third image generating apparatus according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a third head-up display system according to an embodiment of the present invention;

Fig. 11 is a schematic structural diagram of a fourth image generating apparatus according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a fourth head-up display system according to an embodiment of the present invention;

Fig. 13 is a schematic structural diagram of a fifth image generating apparatus according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a sixth image generating apparatus according to an embodiment of the present invention;

Fig. 15 is a schematic structural diagram of a fifth head-up display system according to an embodiment of the present invention;

FIG. 16 is a schematic diagram of a sixth head-up display system according to an embodiment of the present invention;

FIG. 17 is a schematic diagram of a seventh exemplary head-up display system according to an embodiment of the present invention;

FIG. 18 is a schematic diagram showing the relative positions of a filtering device and an image generating device according to an embodiment of the present invention;

FIG. 19 is a schematic diagram of an imaging principle of a three-dimensional head-up display system according to an embodiment of the present invention;

FIG. 20 is a schematic diagram of an imaging principle of a three-dimensional head-up display system according to the prior art;

FIG. 21 is a flowchart of an image display method according to an embodiment of the present invention;

FIG. 22 is a display image of the prior art;

Fig. 23 is a display image according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The Head Up Display (HUD) technology refers to that light rays emitted by an image generating unit (Picture Generation Unit, PGU) are finally projected onto an imaging component (such as an imaging plate and a windshield) through reflective optical design, so that a driver can directly see information such as speed per hour and navigation without head lowering while observing the real environment outside the windshield, distraction caused by head lowering of the driver looking at a dashboard or a central control screen in the driving process is avoided, driving safety coefficient is further improved, and better driving experience can be brought.

The PGU acts as a core component in the HUD for generating images, and its imaging performance directly affects the product performance of the HUD. In some HUD products today, PGUs are mainly implemented based on these several technologies: liquid crystal display (Liquid CRYSTAL DISPLAY, LCD), digital light Processing (DIGITAL LIGHT Processing, DLP), liquid crystal on silicon (Liquid Crystal On Silicon, LCOS), laser beam scanning (Laser Beam Scanning, LBS). The two PGU technologies, the LCD with the most mature technology and the LBS with the most excellent performance, are described in detail below.

Fig. 1 is a schematic diagram of an LCD in the prior art, as shown in fig. 1, the LCD includes an LED lamp 1, a polarizer (Polarizer) 2, a liquid crystal (liquid crystal) 3, a thin film transistor (Thin Film Transistor, TFT) (not shown in fig. 1), a Color Filter (CF) 4, an analyzer (Polarizer) 5, and the like, wherein the LED lamp emits white light. In specific implementation, the LED lamp emits white light, and the white light is incident on collimating optical devices such as a total internal reflection lens (Total Internal Reflection, TIR) and light homogenizing devices such as a Micro lens array (Micro LENS ARRAY), and then enters a polarizer 2, and after being filtered by the polarizer 2, enters devices such as a Glass substrate (Glass substrate) and exits to a color filter 4, and after being filtered by the color filter 4, light rays with three colors of red, green and blue are emitted, and then enters devices such as the Glass substrate and exits to an analyzer 5, and after being filtered by the analyzer 5, an image light beam is emitted. It can be understood that the white light emitted by the LED lamp is filtered by the polarizer 2, the color filter 4 and the analyzer 5, which results in low light transmittance, and the LCD screen has a structure of many microns, which is easy to diffract and has poor color performance. In the actual use process, the backlight is provided by the area array illumination, so that the backlight power is high, and the light reflectivity is very low, the absorptivity is very high, and the temperature rise and screen burning caused by the reverse sunlight flow easily occur.

Fig. 2 is a schematic structural diagram of an LBS PGU in the prior art, and as shown in fig. 2, the LBS PGU includes a light source 6, a beam combining device 71, a planar mirror 72, a micro-electromechanical system (MEMS) 8, and a projection screen 9. Wherein the light source 6 may comprise red (R), green (G) and blue (B) three primary color laser light sources; the beam combining device 71 combines the red (R), green (G) and blue (B) laser beams; the plane mirror 72 is used to reflect the light beam from the combining means 71 to the MEMS8; the MEMS8 is used to modulate the light beam from the light source 6 and project the light beam onto the projection screen 9, and scanning of the light beam in space can be achieved by controlling the deflection of the MEMS8, thereby forming an image on the projection screen 9. It can be understood that, since the resolution of image display and the quality of image display are determined by the laser modulation frequency, the resolution of the three-color laser light source needs to be modulated to meet the requirement of image display in the actual use process of LBS, which results in the problem of high cost.

In order to solve the technical problems, the technical scheme of the embodiment of the invention provides an image generating device, which is based on the fact that a laser light source emits three-color laser and a display unit such as a black-and-white liquid crystal display screen adjusts the brightness of the three-color laser, so that the technical effects of high imaging color gamut, high light efficiency, good color expression, high brightness, reduced laser speckle, no sunlight backflow and the like are achieved.

Fig. 3 is a schematic structural diagram of a first image generating apparatus according to an embodiment of the present invention, and as shown in fig. 3, the image generating apparatus 10 includes a backlight unit 100 and a display unit 200; the backlight unit 100 is used to provide a color backlight source for the display unit 200; the display unit 200 is configured to display black and white image elements corresponding to color image elements of the color backlight light source; the backlight unit 100 includes a laser light source 110, a scanning part 120, and an imaging part 130; the laser light source 110 emits a color image beam corresponding to the laser to the scanning section 120; the scanning part 120 modulates the laser and emits a laser beam, and scans the laser beam in at least two directions of a plane of the imaging part 130 to form a color image element in the imaging part 130; the imaging section 130 is disposed opposite to the display unit 200, and the imaging section 130 emits image beams of color image elements to the display unit 200, that is, the imaging section 130 provides colors (colors) for a final target image, and the display unit 200 provides contours for the final target image. The imaging unit 130 outputs an image beam of a color image element to the display unit 200 and an image beam of a black-and-white image element displayed by the display unit 200 to form a target image beam (color image), and outputs the target image beam to an imaging device of a head-up display system. The imaging unit 130 can homogenize the laser beam emitted from the scanning unit 120. At least two directions of the scanning unit 120 include a first direction 1 and a second direction 2, and the first direction 1 and the second direction 2 intersect.

It should be noted that the polarization direction of the laser light source 110 and the polarization direction of the display unit 200 need to be kept identical.

The image generating device 10 may be used in a vehicle-mounted head-up display system, generates an image according to vehicle running and road information acquired by a vehicle machine, emits an image beam to other focusing components or other components for turning an optical path in the system, and finally, the image beam is incident on an imaging element such as a windshield and is reflected to enter a human eye for imaging.

The backlight unit 100 includes, but is not limited to, the laser light source 110, the scanning unit 120 and the imaging unit 130, and the collimating assembly for beam combination and the collimating assembly for collimation may be set according to the actual imaging requirement and the accuracy of the collimation of the laser light source and the accuracy of the actual assembly or other assemblies, and the actual assembly and assembly specification of the backlight unit 100 are not limited in the embodiments of the present invention. The display unit 200 may be a liquid crystal display, where the display unit 200 includes, but is not limited to, a plurality of pixels and pixel electrodes, and a black frame disposed according to the composition of the backlight unit 100 and located at a position of a color filter of an existing LCD, where a color light-transmitting film is not disposed, and other components may be adjusted according to experience of those skilled in the art, which is not limited in the embodiment of the present invention; the display unit 200 may modulate the brightness of the transmitted light according to the image formed by the image generating apparatus 10, thereby realizing imaging according to the backlight. The laser source 110 may be a red, green or blue laser source, and the specific layout and parameters of the three-color light source may be set according to practical requirements. The scanning portion 120 may be a micro-electromechanical system (micro-electromechanical system, MEMS), and may be implemented as a dual-axis MEMS. The imaging part 130 includes, but is not limited to, a diffuser (diffuser) for homogenizing and imaging the laser beam emitted from the scanning part and emitting the laser beam to the display unit 200. The polarization state of the laser light emitted from the laser light source 110 is the same as that of the display unit 200.

Specifically, since the laser has the characteristics of good monochromaticity, strong directivity and the like, the backlight unit 100 using the laser as the light source emits the backlight similar to area array illumination for the display unit 200 to modulate and image, the image generated by the image generating device 10 and the image beam emitted when being used as the image source of the head-up display system can be made, compared with the image generated by the existing LCD technology and the image beam emitted by the existing LCD technology, the method has the advantages of good color performance, high color gamut, high brightness and the like, and the resolution and the modulation frequency are related, compared with the existing LCD technology, the method uses two polarizing plates to select light, and obtains light rays with various colors through the color filter, so that the light transmittance is very low. In an actual scene, the backlight unit 100 modulates laser through the scanning part 120 and scans the modulated laser beams in at least two directions of the imaging part 130, the imaging part 130 homogenizes and images the laser beams and emits backlight similar to area array illumination light for the image generating device 10 to modulate and image, and compared with the prior LCD technology which uses a lamp panel integrated by lamp beads to provide the area array illumination light, the technical scheme of the embodiment of the invention has more friendly space layout and lower backlight power.

In addition, since the proportion of the image elements to be displayed in the head-up display device occupying the virtual image area is generally low, only a small portion of pixels need to be turned on in the actual imaging process of the display unit 200 provided by the embodiment of the invention, so that the power consumption is reduced, and the situation that the temperature is raised and the screen is burned due to the fact that the pixels are all turned on and sunlight flows backward is avoided when the display unit is applied to a head-up display system and other display devices.

In an embodiment, the image display device shown in fig. 3 may be applied to a head-up display system, and fig. 4 is a schematic structural diagram of a first head-up display system according to an embodiment of the present invention, where, as shown in fig. 4, the image display device 10 is used for generating an image of the head-up display system.

According to the technical scheme, the laser light source emits laser to the scanning part, the laser light is modulated by the scanning part and emitted into the laser light beam, the laser light beam scans in at least two directions of a plane where the imaging part is located, the imaging part homogenizes and images the laser light beam and emits backlight to the display unit, and the display unit modulates the brightness of transmitted light according to the formed image to realize imaging.

Optionally, fig. 5 is a schematic structural diagram of a display unit according to an embodiment of the present invention, and as shown in fig. 5, the display unit 200 includes a grid configured as a black-and-white display unit, in which only a lattice and a black matrix frame 210 are disposed in a pixel

Specifically, the laser light source 100 emits three-color laser, the three-color laser is modulated by the scanning portion 120 and the imaging portion 130 emits color backlight after being imaged, so that the display unit 200 can image multiple colors without using a color filter, and further emit color image beams. It can be understood that, because the laser is used as coherent light and the wavelength is narrower, diffuse reflection occurs when the laser passes through the transparent scatterers such as the rest of the glass substrate and the like included in the display unit 200, so that irregular laser speckles are generated.

Alternatively, with continued reference to fig. 3, the laser light source 110 includes a red laser light source 111, a green laser light source 112, and a blue laser light source 113.

The modulation frequencies of the red laser light source 111, the green laser light source 112, and the blue laser light source 113 may be set according to actual imaging requirements, for example, specific values of the modulation frequencies may be set according to imaging resolution.

Specifically, the laser light source 110 includes a red laser light source 111, a green laser light source 112, and a blue laser light source 113, in which, in the actual imaging process, the three-color laser light sources emit red laser light, green laser light, and blue laser light, respectively, and the three-color laser light is modulated by the scanning unit 120 and is uniformly imaged by the imaging unit 130 and then is incident to the display unit 200, so that the deflection direction of the liquid crystal can be controlled by adjusting the pixel electrode of the display unit 200, so as to realize brightness adjustment and generate an image.

Optionally, fig. 6 is a schematic diagram showing the relative positions of a liquid crystal display and a scanning portion according to an embodiment of the present invention, and as shown in fig. 6, a display unit 200 includes a first area 201 and a second area 202; the first region 201 and the second region 202 each include a plurality of pixels; each pixel comprises a pixel electrode and a liquid crystal layer; the pixel electrode of the first region 201 controls the liquid crystal layer to be in a first state to transmit red, green, and blue laser light; the pixel electrode of the second region 202 controls the liquid crystal layer to be in the second state to block red, green, and blue laser light.

The coverage of the first area 201 and the second area 202 in the display unit 200 may be set according to the actual imaging requirement and the propagation path of the backlight emitted from the imaging portion 120, which is not limited in the embodiment of the present invention. The pixel electrode may be a thin film transistor (Thin Film Transistor, TFT) for controlling the voltage across the pixel and thus the deflection direction of the liquid crystal layer.

Specifically, the display unit 200 includes a plurality of pixels, each including a pixel electrode and a liquid crystal layer, and the display unit controls the intensity of light by controlling the voltage levels at different positions, changing the arrangement direction of the liquid crystal layer under the action of an electric field, and changing the polarization direction of transmitted light, together with upper and lower polarizers (polarizers and analyzers). Since the display unit 200 removes the filter film of the color filter, only configures the lattice and black matrix frame, and uses the laser light source 110 as the light source of the backlight unit 100, in the actual imaging process of the image generating device 10, the backlight containing the image information is incident on the first area 201, the voltage on the pixel is adjusted by the pixel electrode, and the deflection direction of the liquid crystal layer is controlled, so that the red laser, the green laser and the blue laser penetrate through the liquid crystal layer, and further can image on the imaging side of the first area 201, and since the display unit 200 is configured as a black-and-white display unit, if the second area 202 does not display an image, the pixel point of the area can be controlled to be turned off, and when the image generating device 10 is used as the image source of the head-up display system, the pixel point of the whole liquid crystal display screen can be prevented from being turned on, and sunlight can flow backward into the display unit, resulting in warming and burning the screen.

Optionally, with continued reference to fig. 3, the backlight unit 100 further includes a beam combining part 140; the beam combining part 140 is disposed between the laser light source 110 and the scanning part 120; the beam combining unit 140 combines the red laser beam emitted from the red laser light source 111, the green laser beam emitted from the green laser light source 112, and the blue laser beam emitted from the blue laser light source 113, and emits the combined laser beams to the scanning unit 130.

The beam combining portion 140 includes, but is not limited to, a polygon mirror, and the component types of the beam combining portion 140 and the layout of the components may be set according to the imaging precision requirement, the actual specification of the laser light source 110, etc., for example, when the alignment precision of the laser light source 110 is low, a volume bragg grating may be selected as the actual component of the beam combining portion 140, and then the effect of the volume bragg grating is utilized to compensate the influence of the low alignment precision of the laser light source 110 on the imaging definition.

Specifically, the beam combining unit 140 is disposed between the laser source 110 and the scanning unit 120, and the three-color laser source emits red laser, green laser and blue laser to the beam combining unit 140, and the beam combining unit 140 combines the three-color laser and emits the combined laser to the scanning unit 120, and the laser beam is modulated by the scanning unit 120 and emitted to the imaging unit 130 for imaging.

Alternatively, fig. 7 is a schematic structural diagram of a second image generating apparatus according to an embodiment of the present invention, and as shown in fig. 7, the beam combining part 140 includes a first reflecting unit 141 and a second reflecting unit 142; the first reflecting unit 141 is disposed on the optical paths of the red laser light and the green laser light; the second reflection unit 142 is disposed on the optical path of the blue laser; the first and second reflecting units 141 and 142 are disposed in parallel along the third direction 3; the first and second reflecting units 141 and 142 have a first predetermined angle with the third direction 3, for example, may be 45 °; the first reflecting unit 141 transmits the red laser light to the second reflecting unit 142, and reflects the green laser light to the second reflecting unit 142; the second reflection unit 142 reflects the red laser light and the green laser light, transmits the blue laser light, and performs beam combination.

The actual specifications of the first reflecting unit 141 and the second reflecting unit 142 may be set according to the optical characteristics such as the polarization state of the laser light emitted from the three-color laser light source, and are not limited herein. The first preset included angle may be set according to the actual position of the laser light source and the overall layout requirement of the backlight unit 100.

Specifically, the first reflecting unit 141 and the second reflecting unit 142 act together on the three-color laser light to realize the beam combination of the three-color laser light.

It should be noted that fig. 7 only shows a case where the beam combining portion 140 is configured as a two-sided half mirror, and the red laser light source 111 and the two reflection units are arranged in parallel in the third direction 3, which is one of the cases where the technical solution provided in the embodiment of the present invention can be implemented, and the component configuration of the beam combining portion 140 may also be adjusted according to the actual three-color light source layout.

In an embodiment, the image display device shown in fig. 7 may be applied to a head-up display system, and fig. 8 is a schematic structural diagram of a second head-up display system according to an embodiment of the present invention, where, as shown in fig. 8, the image display device 10 is used for generating an image of the head-up display system.

Fig. 9 is a schematic structural diagram of a third image generating apparatus according to an embodiment of the present invention, where, as shown in fig. 9, the beam combining portion further includes a third reflection unit 143; the third reflection unit 143 is disposed in parallel with the first and second reflection units 141 and 142 along the third direction 3; the third reflection unit 143 reflects the red laser light to the first reflection unit 141.

The actual specification of the third reflection unit 143 may be set according to the polarization state of the red laser light, or the like.

Specifically, the three-color laser light sources are arranged in parallel in the third direction 3, after the red laser light is incident to the third reflection unit 143, the red laser light is reflected by the third reflection unit 143 and is incident to the first reflection unit 141, and then transmitted by the first reflection unit 141, and further reflected by the second reflection unit 142 to combine with the green laser light and the blue laser light.

In an embodiment, the image display device shown in fig. 9 may be applied to a head-up display system, and fig. 10 is a schematic structural diagram of a third head-up display system according to an embodiment of the present invention, where, as shown in fig. 10, the image display device 10 is used for generating an image of the head-up display system.

Optionally, fig. 11 is a schematic structural diagram of a fourth image generating apparatus according to an embodiment of the present invention, as shown in fig. 11, the beam combining portion 140 includes a first bragg grating 144 and a second bragg grating 145; the first bragg grating 144 is disposed on the optical paths of the red laser and the green laser; the second volume bragg grating 145 is disposed on the optical path of the blue laser; the first bragg grating 144 has a second predetermined included angle with the third direction 3; the second volume bragg grating 145 has a third predetermined angle with the third direction 3; the first bulk bragg grating 144 transmits the red laser light and the green laser light to the second bulk bragg grating 145; the second volume bragg grating 145 reflects the red laser light and the green laser light, transmits the blue laser light, and performs beam combination.

The first volume bragg grating 144 and the second volume bragg grating 145 may be set according to actual parameters of the three-color laser light, which is not limited herein. The actual values of the second preset included angle and the third preset included angle may be set according to the arrangement of the remaining components of the backlight unit 100, the laser parameters, and the like.

Specifically, the first bragg grating 144 and the second bragg grating 145 act on the three-color laser together to realize beam combination of the three-color laser, and it can be understood that, due to the optical characteristics of the bulk bragg gratings, when the bulk bragg gratings are used as beam combination devices, more laser sources with poor collimation degree can be adapted, and thus cost can be effectively reduced.

In an embodiment, the image display device shown in fig. 11 may be applied to a head-up display system, and fig. 12 is a schematic structural diagram of a fourth head-up display system according to an embodiment of the present invention, where, as shown in fig. 12, the image display device 10 is used for generating an image of the head-up display system.

Fig. 13 is a schematic structural diagram of a fifth image generating apparatus according to an embodiment of the present invention, and fig. 14 is a schematic structural diagram of a sixth image generating apparatus according to an embodiment of the present invention, where, as shown in fig. 13, the beam combining part 140 includes glass 146 of an ion doping process, or, as shown in fig. 14, the beam combining part 140 includes a prism 147; the ion-doped glass 146 or prism 147 combines the red, green and blue lasers.

The actual specifications of the glass 146 and the prism 147 in the ion doping process may be set according to actual requirements, and are not limited herein.

Specifically, the glass 146 or the prism 147 adopting the ion doping process is used for combining the three-color laser, the requirement on the collimation precision of the laser light source is lower, the cost can be effectively reduced, and the glass 146 adopting the ion doping process can effectively reduce the interference of laser speckles on imaging.

Optionally, with continued reference to fig. 3 and 6-10, the backlight unit 100 further includes a collimating section 150; the collimating unit 150 is disposed on the optical path between the laser light source 110 and the beam combining unit 140, and is configured to collimate the laser light and output the collimated laser light to the beam combining unit 140.

The collimating part 150 includes, but is not limited to, a converging lens, other optical components may be set according to actual requirements, and the spatial layout of the components inside the collimating part 150 may be set according to the actual structures and layouts of the laser light source 110 and the beam combining part 140.

Specifically, the collimation accuracy of the laser beam can affect the beam combination effect of the beam combination part 140, further affect the imaging definition of the image generating device, and the collimation part 150 is arranged between the beam combination part 140 and the laser light source 110 to collimate the laser emitted by the laser light source, so that the beam combination effect of the beam combination part 140 can be improved, the imaging effect of the image generating device can be further improved, and the laser light source with various collimation accuracy can be adapted by arranging the collimation part 150, so that the cost can be effectively reduced.

In a specific embodiment, the image display device shown in fig. 13 and 14 may be applied to a head-up display system, fig. 15 is a schematic structural diagram of a fifth head-up display system provided in an embodiment of the present invention, fig. 16 is a schematic structural diagram of a sixth head-up display system provided in an embodiment of the present invention, and as shown in fig. 15 and 16, the image display device 10 is used for generating an image of the head-up display system.

Alternatively, the scanning portion 120 includes a micro-electromechanical system. Wherein. The microelectromechanical system may be a (MEMS, micro-electromechanical system), which in practice may be a biaxial MEMS.

Specifically, the micro-electromechanical system can realize the modulation of laser and emit laser beams, and can scan the laser beams in space, so that the imaging effect and the dodging effect of the imaging part can be improved.

Based on the same concept, the technical solution of the embodiment of the present invention further provides a head-up display system, fig. 17 is a schematic structural view of a seventh head-up display system provided by the embodiment of the present invention, fig. 18 is a schematic relative position diagram of a light filtering device and an image generating device provided by the embodiment of the present invention, and as shown in fig. 17 and fig. 18, the head-up display system includes a light filtering device 20, a reflecting device 30 and an imaging device 40, and any image generating device 10 provided by the embodiment of the present invention; the reflecting means 30 comprises at least one plane mirror and at least one curved mirror; the filter device 20 is disposed on the optical path of the image beam emitted from the image generating device 10, and is used for transmitting the light beam with the same wavelength as the laser beam emitted from the laser source; the image generating device 10 emits an image beam to the filtering device 20, the filtering device 20 transmits the image beam to the reflecting device 30, the reflecting device 30 reflects the image beam to the imaging device 40, and the imaging device 40 reflects the image beam to human eyes to form virtual images.

The filter device 20 includes, but is not limited to, a filter, and the actual specification may be set according to the actual parameters of the image beam emitted from the image generating device 10, which is not limited herein. The imaging device 40 includes, but is not limited to, a windshield, but may be configured as other imaging elements according to actual needs.

Specifically, since the image generating device 10 uses laser with a narrower wavelength as the light source, and the polarization direction of the liquid crystal display included in the image generating device is consistent with that of the laser, it can be known that only the pixels of the image area displayed by the liquid crystal display need to transmit the laser in the actual imaging process of the head-up display system, and the rest pixels of the liquid crystal display need to be turned off. It can be understood that the filter device 20 is located on the optical path of the image beam emitted from the image producing device 10, and can transmit the light of the corresponding wavelength band of the three-color laser, so that the image beam can be incident on the reflecting device, and then form a virtual image at the human eye through subsequent focusing reflection and the like. And because the light filtering device 20 only transmits the light of the three-color laser wave band, in the actual use process, the light outside the three-color laser wave band cannot enter the liquid crystal display screen through the light filtering device 20, and further the problem of screen burning caused by the backward flowing of the sunlight is solved.

Optionally, fig. 19 is a schematic diagram of an imaging principle of a three-dimensional head-up display system provided by the embodiment of the present invention, and fig. 20 is a schematic diagram of an imaging principle of a three-dimensional head-up display system in the prior art, where, as shown in fig. 19, the head-up display system provided by the embodiment of the present invention further includes a light splitting device 50; the beam splitting device 50 is disposed on the optical path of the image beam emitted from the image generating device 10, and is used for deflecting the image beam.

The spectroscopic device 50 includes, but is not limited to, a lenticular lens, and in a specific implementation, the lenticular lens may be attached to the lcd panel, and the relative position between the lenticular lens and the lcd panel may be set according to the division situation of the actual pixel point of the lcd panel.

Specifically, as shown in fig. 20, the principle of the three-dimensional head-up display technology in the related art is to split light in units of R, G, B three-color light-emitting points of a color filter. As shown in fig. 19, since the image generating apparatus provided in the embodiment of the present invention is not provided with a color filter, and further, when splitting light, light is split by using a single pixel as a unit, the resolution is improved by five times compared with the scheme shown in fig. 14.

Because the existing LCD display is multi-configured to be colorful, however, because the laser has strong coherence, if the displayed image has two color intersections, because the pixel points corresponding to the two colors are all conducted, laser speckle can be generated to influence the definition of the image display, especially for a head-up display system, the problem of boundary blurring caused by the speckle phenomenon when the displayed image elements are characters and shapes and the superposition of the two colors is more obvious. Fig. 21 is a flowchart of an image display method according to an embodiment of the present invention, as shown in fig. 21, where the method includes:

S10, acquiring an image corresponding to the image beam.

The image beam corresponding image acquisition includes, but is not limited to, image acquisition in a display area of a liquid crystal display screen, image color and the like. The acquisition mode can be realized by simulating an image through a digital signal.

Specifically, in the actual imaging process, the image color can be set autonomously, if the generated image has two color boundary areas and the two colors are not black, then the pixel points corresponding to the two color areas are required to be controlled to be conducted, however, the laser is used as a light source to realize imaging, due to the coherence of the laser and the characteristic of narrower wavelength, laser speckles can appear in the two color superposition areas to influence the definition of the image, and therefore, the acquisition of the image corresponding to the image beam can provide reference for the subsequent color configuration.

S20, judging whether each display element in the image has two color intersections.

The intersection of two colors is at least two colors, or may be multiple colors, which is not limited herein.

Specifically, the image generating device uses laser as a light source to realize imaging, laser speckles can appear in the superposition area of two colors due to the coherence and the characteristic of narrower wavelength of the laser, and the definition of the image is affected, so that the image corresponding to the image light beam is obtained, whether the intersection of the two colors exists or not is judged, and reference can be provided for subsequent color configuration.

S21, if so, acquiring one of the two colors in a display area of the liquid crystal display screen, and controlling the pixels of the display area to be turned off or controlling the gray values of the pixels of the display area corresponding to the two colors in the liquid crystal display screen to be different.

The pixel point of the display area corresponding to one of the two colors is controlled to be turned off, and the pixel point can be set according to actual imaging, which is not limited herein.

Specifically, due to the coherence and the narrower wavelength of laser, laser speckles can appear in the overlapping area of two colors, which affects the definition of an image, so that the pixel points of the display area corresponding to one of the two colors are controlled to be turned off, namely one of the two colors is configured to be black, and the problem that the imaging definition is affected due to the fact that the pixel points corresponding to the two colors are turned on can be avoided. Also, if there is another demand for the image display effect, the colors of the images having intersections may be configured to be white and gray.

Fig. 22 is a conventional display image, and fig. 23 is a display image according to an embodiment of the present invention. As shown in fig. 22, the image includes two color display areas a and B, where the two colors are displayed, for example, white and orange, and since the two colors are displayed at the boundary of the areas where the two colors are located, the pixels of the two areas are all on, but because of overlapping of the two colors and strong coherence of the laser, speckle is generated to cause blurring at the boundary. As shown in fig. 23, in order to avoid the blurring phenomenon at the boundary caused by the speckle, the display color of the area a may be configured to be black, the pixel point of the area a may be turned off in practical implementation, and in practical imaging, only the color display of the area B is required to be implemented, so that the problem that the image sharpness is affected due to the speckle can be avoided.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (15)

1. An image generating device for a head-up display system, comprising a backlight unit and a display unit; the backlight unit is used for providing a color backlight light source for the display unit; the display unit is configured to display black-and-white image elements corresponding to color image elements of the color backlight light source;

the backlight unit comprises a laser light source, a scanning part and an imaging part;

The laser light source emits color image beams corresponding to laser to the scanning part;

The scanning part modulates the laser and emits a laser beam, and scans the laser beam in at least two directions of a plane where the imaging part is located so as to form the color image element in the imaging part;

The imaging part is arranged opposite to the display unit, and the imaging part emits image light beams of the color image elements to the display unit;

the imaging part emits an image beam of a color image element of the display unit and an image beam of a black-and-white image element displayed by the display unit to form a target image beam, and emits the target image beam to an imaging device of the head-up display system;

Wherein at least two directions of the scanning part include a first direction and a second direction, the first direction and the second direction intersecting.

2. The image generation apparatus according to claim 1, wherein the display unit is configured as a black-and-white display unit.

3. The image generation apparatus according to claim 2, wherein the laser light source includes a red laser light source, a green laser light source, and a blue laser light source, and a polarization direction of the laser light source coincides with a polarization direction of the display unit.

4. The image generation apparatus according to claim 3, wherein the liquid crystal display screen includes a first region and a second region;

the first region and the second region each include a plurality of pixels; each of the plurality of pixels comprises a pixel electrode and a liquid crystal layer;

the pixel electrode of the first region controls the liquid crystal layer to be in a first state so as to transmit the red laser light, the green laser light and the blue laser light; the pixel electrode of the second region controls the liquid crystal layer to be in a second state to block the red laser light, the green laser light, and the blue laser light.

5. The image generation apparatus according to claim 3, wherein the backlight unit further comprises a beam combining section;

the beam combining part is arranged between the laser light source and the scanning part;

the beam combining part is used for combining the red laser emitted by the red laser source, the green laser emitted by the green laser source and the blue laser emitted by the blue laser source.

6. The image generation apparatus according to claim 5, wherein the beam combining section includes a first reflection unit and a second reflection unit;

The first reflecting unit is arranged on the light paths of the red laser and the green laser; the second reflecting unit is arranged on the light path of the blue laser; the first reflecting unit and the second reflecting unit are arranged in parallel along a third direction; the first reflecting unit and the second reflecting unit have a first preset included angle with the third direction;

the first reflecting unit transmits the red laser to the second reflecting unit and reflects the green laser to the second reflecting unit; the second reflection unit reflects the red laser and the green laser, transmits the blue laser, and combines the beams.

7. The image generation apparatus according to claim 6, wherein the beam combining section further comprises a third reflection unit; the third reflecting unit is arranged in parallel with the first reflecting unit and the second reflecting unit along the third direction;

the third reflection unit reflects the red laser light to the first reflection unit.

8. The image generation apparatus according to claim 5, wherein the beam combining section includes a first volume bragg grating and a second volume bragg grating;

The first body Bragg grating is arranged on the light paths of the red laser and the green laser; the second volume Bragg grating is arranged on the light path of the blue laser; the first body Bragg grating and the third direction have a second preset included angle; the second body Bragg grating has a third preset included angle with the third direction;

The first bulk Bragg grating transmits the red laser and the green laser to the second bulk Bragg grating; and the second volume Bragg grating reflects the red laser and the green laser, transmits the blue laser and performs beam combination.

9. The image generation apparatus of claim 5, wherein the beam combining section comprises an ion doping process device.

10. The image generation apparatus according to any one of claims 5 to 9, wherein the backlight unit further comprises a collimating section; the collimating part is arranged on an optical path between the laser light source and the beam combining part and is used for collimating the laser and emitting the collimated laser to the beam combining part.

11. The image generation apparatus of claim 1, wherein the scanning section comprises a microelectromechanical system.

12. A heads-up display system comprising a light filtering device, a reflecting device and an imaging device, and an image generating device according to any of claims 1-10;

The reflecting device comprises a reflecting mirror; the filter device is arranged on a light path of the image light beam emitted by the image generating device and used for transmitting light rays with the same wavelength as the laser light beam emitted by the laser light source;

The image generating device emits the image light beam to the filtering device, the filtering device transmits the image light beam to the reflecting device, the reflecting device reflects the image light beam to the imaging device, and the imaging device reflects the image light beam to human eyes to form virtual images.

13. The heads-up display system of claim 12 further comprising a light splitting device;

The light splitting device is arranged on a light path of the image generating device for emitting the image light beam and is used for deflecting the image light beam.

14. The heads-up display system of claim 13 wherein the spectroscopic device comprises a lenticular grating.

15. An image display method, characterized by being used for the image generating apparatus of claims 1 to 11, or the head-up display system of claims 12 to 14;

the image display method comprises the following steps:

Acquiring an image corresponding to the image light beam;

Judging whether each display element in the image has two color intersections;

If yes, acquiring one of the two colors in a display area of the liquid crystal display screen, and controlling the pixels of the display area to be turned off or controlling the gray values of the pixels of the display area corresponding to the two colors in the liquid crystal display screen to be different.