CN210038329U - Display device and virtual reality display system - Google Patents

Abstract

A display device and a virtual reality display system are provided. The display device includes: the liquid crystal display device comprises a liquid crystal display panel, a direct type backlight source positioned on the light incident side of the liquid crystal display panel and an eyepiece positioned on the light emergent side of the liquid crystal display panel to enlarge an image displayed by the liquid crystal display panel. The eyepiece includes a convex lens, and both surfaces of the convex lens are smooth surfaces. The display device provided by the embodiment of the disclosure uses the liquid crystal display panel using the direct type backlight source as the light source in cooperation with the convex lens comprising two smooth surfaces, so as to prevent the glare phenomenon caused by the high-contrast picture on the basis of improving the contrast of the display picture through local dynamic backlight adjustment.

Description

Display device and virtual reality display system

Technical Field

At least one embodiment of the present disclosure relates to a display device and a virtual reality display system.

Background

Virtual reality technology is a computer simulation technology that can create and experience a virtual world, including aspects of simulation environment, perception, natural skills, and sensing equipment. In a virtual reality display system, binocular stereoscopic vision plays a great role, and different images seen by both eyes of a user can be displayed on different displays to form parallax, thereby producing stereoscopic vision.

SUMMERY OF THE UTILITY MODEL

At least one embodiment of the present disclosure provides a display device and a virtual reality display system. The display device provided by the embodiment of the disclosure uses the liquid crystal display panel using the direct type backlight source as the light source in cooperation with the convex lens comprising two smooth surfaces, so as to prevent the glare phenomenon caused by the high-contrast picture on the basis of improving the contrast of the display picture through local dynamic backlight adjustment.

At least one embodiment of the present disclosure provides a display device including: the backlight module comprises a liquid crystal display panel, a direct type backlight source located on the light incident side of the liquid crystal display panel and an eyepiece. The eyepiece is located liquid crystal display panel's light-emitting side is in order to enlarge the image that liquid crystal display panel shows, the eyepiece includes convex lens, two surfaces of convex lens are smooth surface.

For example, the convex lens is a spherical lens or an aspherical lens.

For example, one of the two surfaces of the convex lens is an outwardly convex surface as a whole, and the other is an outwardly convex, inwardly concave surface as a whole, or a flat surface as a whole.

For example, the display screen of the liquid crystal display panel is positioned within one focal length of the eyepiece.

For example, the sum of the thicknesses of the liquid crystal display panel and the direct type backlight is less than 2.8 mm.

For example, the direct type backlight source includes a plurality of light emitting diodes arranged in an array along a row direction and a column direction, at least one of the plurality of light emitting diodes has a size in the row direction and the column direction not greater than 500 μm, and a distance between centers of two adjacent light emitting diodes in the row direction and a distance between centers of two adjacent light emitting diodes in the column direction are not greater than 1.4 mm.

For example, the direct type backlight source further includes a driving circuit connected to the plurality of light emitting diodes, and the driving circuit is configured to adjust the light emission intensities of the plurality of light emitting diodes.

For example, the display device is a head mounted virtual reality display device.

For example, the display device further includes: the eyeball tracker is located on one side, facing the eyepiece, of the liquid crystal display panel, wherein the eyeball tracker comprises a camera and an infrared light source.

For example, the display device further includes: eyeball detection unit and controller. The eyeball detection part is connected with the eyeball tracker to receive data of the image shot by the camera and determine plane information of a fixation point of the eyeball according to the data, wherein the plane information is position information of the fixation point in an image plane displayed by the liquid crystal display panel. The controller is connected to the eyeball detecting portion and the liquid crystal display panel, and is configured to adjust, according to the plane information, a display resolution at the position of the gaze point within the image plane to be larger than a display resolution of an area outside the gaze point within the image plane.

At least one embodiment of the present disclosure provides a virtual reality display system including the above display device.

For example, the virtual reality display system further includes: a signal transmission part located in the display device; and the data processor is positioned outside the display device and connected with the signal transmission part. The signal transmission part is connected with the eyeball tracker to transmit data of the image shot by the camera to the data processor, the data processor is configured to determine plane information of a fixation point of an eyeball according to the data, the plane information is position information of the fixation point in an image plane displayed by the liquid crystal display panel, and an adjusting instruction is sent to the signal transmission part according to the plane information; the signal transmission part is connected with the liquid crystal display panel and transmits the adjusting instruction to the liquid crystal display panel so as to adjust that the display resolution at the position of the fixation point in the image plane is larger than the display resolution of the area outside the fixation point in the image plane; the data processor is also configured to be connected with a driving circuit in the direct type backlight source so as to adjust the light emitting intensity of the plurality of light emitting diodes according to the image information displayed by the liquid crystal display panel.

For example, the virtual reality display system also includes a housing. The display device is located inside the housing, and the data processor is located outside the housing.

For example, the eyepiece includes a first eyepiece and a second eyepiece corresponding to left and right eyes of a human eye, respectively, the number of the liquid crystal display panels is one, and two display regions corresponding to the first eyepiece and the second eyepiece, respectively.

For example, the eyepieces include a first eyepiece and a second eyepiece corresponding to left and right eyes of a human eye, respectively, the number of the liquid crystal display panels is at least two, and the number of the liquid crystal display panels corresponding to the first eyepiece and the second eyepiece, respectively, is the same.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1A is a schematic diagram of a display device provided as an example of an embodiment of the present disclosure;

FIG. 1B is a schematic partial structure view of the direct type backlight shown in FIG. 1A;

fig. 2A and 2B are schematic partial structural diagrams of a display device according to another example of an embodiment of the present disclosure;

FIG. 2C is a simplified diagram of a user applying the display device shown in FIGS. 2A and 2B;

fig. 3A is a schematic structural diagram of a virtual reality display system according to another embodiment of the present disclosure; and

fig. 3B is a schematic structural diagram of parts of the virtual reality display system shown in fig. 3A.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

In the research, the inventors of the present application found that: when the organic light emitting diode display is used as a display device in a virtual reality display system, although the contrast of a display screen is high, the response speed of each pixel to an input signal is not as fast as that of a liquid crystal display, so that a user has a smear feeling when viewing a dynamic screen displayed by the organic light emitting diode display. When a liquid crystal display including an edge-lit backlight is used as a display device in a virtual reality display system, although the problem of smear can be solved by using a black insertion technique, the contrast of a display screen is low, colors are not sharp, and power consumption is relatively large.

The embodiment of the disclosure provides a display device and a virtual reality display system. The display device includes: the liquid crystal display device comprises a liquid crystal display panel, a direct type backlight source positioned on the light incident side of the liquid crystal display panel and an eyepiece positioned on the light emergent side of the liquid crystal display panel to enlarge an image displayed by the liquid crystal display panel. The eyepiece includes a convex lens, and both surfaces of the convex lens are smooth surfaces. The display device provided by the embodiment of the disclosure uses the liquid crystal display panel using the direct type backlight source as the light source in cooperation with the convex lens comprising two smooth surfaces, so as to prevent the glare phenomenon caused by the high-contrast picture on the basis of improving the contrast of the display picture through local dynamic backlight adjustment.

The display device and the virtual reality display system provided by the embodiments of the present disclosure are described below with reference to the drawings.

Fig. 1A is a schematic view of a display device according to an embodiment of the disclosure. As shown in fig. 1A, the display device includes a liquid crystal display panel 100, a direct-type backlight 200 located on the light incident side of the liquid crystal display panel 100, and an eyepiece 300 located on the light emergent side of the liquid crystal display panel 100. The human eye can view the virtual image 100' in which the image displayed on the liquid crystal display panel 100 is enlarged through the eyepiece 300. Eyepiece 300 includes a convex lens 310, and both surfaces 311 of convex lens 310 are smooth surfaces. The display device provided by the embodiment of the disclosure uses the liquid crystal display panel using the direct type backlight source as the light source in cooperation with the convex lens comprising two smooth surfaces, so as to prevent the glare phenomenon caused by the high-contrast picture on the basis of improving the contrast of the display picture through local dynamic backlight adjustment.

For example, the display device provided by the embodiment of the present disclosure may be a head-mounted virtual reality display device. The liquid crystal display panel adopting the direct type backlight source as the light source and the head-mounted virtual reality display device comprising two smooth-surface convex lenses are matched for use, so that the glare phenomenon caused by high-contrast pictures can be prevented on the basis of improving the contrast of the display pictures through local dynamic backlight adjustment, and a better experience effect is provided for a user.

For example, fig. 1B is a partial schematic structural view of the direct type backlight shown in fig. 1A. As shown in fig. 1B, the direct type backlight 200 includes a plurality of light emitting diodes 210 arranged in an array along a row direction and a column direction (i.e., Y direction and Z direction in fig. 1B). The direct type backlight 200 further includes a driving circuit 220 connected to the plurality of light emitting diodes 210, and the driving circuit 220 is configured to adjust the light emitting intensity of the plurality of light emitting diodes 210.

For example, a direct-lit backlight 200 that includes a plurality of light emitting diodes 210 may be divided into a plurality of independently controlled illumination zones, each illumination zone corresponding to a respective image area on a liquid crystal display panel. In the local area dynamically controlled backlight adjustment, the control signals of the light emitting diodes 210 are made according to the signals of the corresponding image areas. For example, the data processor for controlling the brightness of the light emitting diode according to the image displayed by the liquid crystal display panel may be located in the display device or outside the display device, which is not limited in the embodiments of the present disclosure.

For example, the entire image displayed by the liquid crystal display panel 100 may be divided into several image areas, each corresponding to an independently controllable led backlight group. That is, the driving circuit 220 may dynamically adjust the brightness of the area corresponding to the light emitting diode 210 in the direct-type backlight 200 according to the display image of the liquid crystal display panel 100. Therefore, on one hand, the gray scale level distribution of the display panel is adjusted along with the image content, so that the gray scale level of the image is finer, and the dynamic contrast of the image is greatly improved due to the enhanced light and dark contrast; on the other hand, the backlight brightness of the backlight source is independently modulated in different areas along with the image content, so that the brightness of the light emitting diode is reduced when a dark-state image is displayed, and the power consumption of the whole backlight source can be reduced.

For example, the driving circuit 220 may be configured to control the light emitting diodes 210 of a certain area not to emit light according to the dark picture, i.e., to make the area in the 0 gray scale area, so as to reduce the backlight brightness of the area. For example, the driving circuit 220 may also control the brightness enhancement of the leds 210 in a certain area according to a bright picture to realize a high-brightness backlight display, thereby further improving the contrast of the display picture. That is, the brightness of the light emitting diode can be adjusted according to the brightness of the picture to achieve the effect of improving the contrast.

The driving circuit 220 in fig. 1B is a schematic diagram, and the specific circuit layout manner of the driving circuit 220 in the embodiment of the present disclosure is not limited, and may be set according to actual situations.

For example, the driving circuit 220 may be a Thin Film Transistor (TFT) to realize dynamic adjustment of the light emitting intensity of the light emitting diodes 210 (or each light emitting diode 210) in each backlight group by the local dynamic backlight system. Therefore, power consumption can be reduced, and the service life of the light source can be prolonged.

For example, the sum of the thicknesses of the liquid crystal display panel 100 and the direct type backlight 200 is less than 2.8 mm.

For example, the thickness of the liquid crystal display panel 100 and the direct type backlight 200 may be less than 2 mm to achieve light and thin without increasing the thickness of the display device provided by the embodiment of the present disclosure.

For example, the at least one light emitting diode 210 has a dimension in both the row direction and the column direction that is no greater than 500 microns. For example, the dimension in the row direction and the column direction in each of the light emitting diodes 210 is not more than 500 μm.

For example, one of the dimensions of each light emitting diode 210 in the row and column directions may be 150 mm, and the other may be 500 μm.

For example, the dimension of each light emitting diode 210 in the row and column directions may be approximately 100 microns, or less than 100 microns.

For example, the distance between the centers of two adjacent light emitting diodes 210 in the row direction is not more than 1.4 mm, and the distance between the centers of two adjacent light emitting diodes 210 in the column direction is not more than 1.4 mm.

For example, the distance between the centers of two light emitting diodes 210 adjacent in the row direction may be 1.38 mm, and the distance between the centers of two light emitting diodes 210 adjacent in the column direction may be 1 mm.

For example, the distance between the centers of two adjacent light emitting diodes 210 in the row direction or the column direction may also be less than 1 micrometer. Of course, the embodiments of the present disclosure are not limited thereto, and the specific distance between the light emitting diodes may be determined according to a balance between the backlight power consumption and the local dynamic backlight control fineness in the product design.

It should be noted that the "center" refers to the geometric center of the light emitting diode.

The embodiment of the disclosure can select the size and the center-to-center distance of the light emitting diodes according to the size requirement of the direct type backlight source, so as to better meet the requirement of high contrast of the display image.

In the embodiments of the present disclosure, the two surfaces of the convex lens are smooth surfaces, which means that the surface of the convex lens has no periodic texture (e.g., periodic protrusions or grooves), unlike the surface of the fresnel lens including the thread structure.

In the virtual reality display system adopting the Fresnel lens as the eyepiece, one surface of the Fresnel lens is provided with a thread structure, and the section of the thread structure is saw-toothed (theoretically, a sharp corner can be formed), so that the inclined surfaces of a plurality of saw-toothed surfaces can be spliced into a continuous surface. However, due to the limitation of the manufacturing process, the sharp corners of the saw-tooth shape are rounded in the process of manufacturing the surface having the screw structure, and the rounded corners generate an excessive surface, thereby generating stray light, which causes a glare phenomenon when the contrast of the display screen of the display panel is high. The display device including the liquid crystal display panel 100 and the direct type backlight 200 provided by the embodiment of the present disclosure has a high contrast ratio, and can prevent a glare phenomenon caused by a high contrast ratio picture on the basis of improving the contrast ratio of a display picture through local dynamic backlight adjustment by matching with an eyepiece having a smooth surface.

For example, as shown in fig. 1A, the convex lens 310 may be a spherical lens, and compared with a surface of a fresnel lens having a screw structure, a smooth surface of the spherical lens may not generate stray light due to an unnecessary surface caused by the limitation of a manufacturing process, so that the display device including the liquid crystal display panel 100 and the direct-type backlight 200 may be combined with the spherical lens to effectively prevent the generation of a glare phenomenon.

For example, the convex lens 310 may be an aspherical lens, in which the lens is not a spherical arc, but the edge of the lens is slightly cut off, and the cross section of the lens is planar. When image light displayed on the liquid crystal display panel 100 is incident on the smooth surface of the aspherical lens, the light can be focused on one point to remove various aberrations. In the embodiment of the disclosure, the display device comprising the liquid crystal display panel and the direct type backlight is matched with the aspheric convex lens, so that the glare phenomenon can be effectively prevented, and better imaging can be realized. The disclosed embodiments are not limited thereto, and the convex lens may also be a free-form surface lens or the like as long as both surfaces are smooth surfaces.

For example, one of the two surfaces of the convex lens 310 is a generally outwardly convex surface and the other is a generally outwardly convex, generally inwardly concave surface or flat surface. That is, the convex lens 310 may be a biconvex lens, a plano-convex lens, or a meniscus lens. The convex lens is schematically shown in fig. 1A as a biconvex lens.

The present disclosure schematically illustrates that the eyepiece 300 includes one convex lens 310, but is not limited thereto, and the eyepiece may further include a lens group, which may include, for example, two convex lenses and a concave lens between the two convex lenses. The present disclosure is not limited thereto as long as the lens group can achieve enlargement of an image displayed by the liquid crystal display panel and the surfaces of all the lenses included are smooth surfaces.

For example, the display screen of the liquid crystal display panel 100 is located within one focal length of the eyepiece 300, so that an image displayed by the display screen of the liquid crystal display panel 100 passes through the eyepiece 300 and then can be an orthoscopically enlarged virtual image 100'.

The focal length of the eyepiece is the equivalent focal length of the eyepiece, and when the eyepiece only comprises one convex lens, the focal length of the eyepiece is the focal length of the convex lens; when the eyepiece includes the lens group, the focal length of the eyepiece is an equivalent focal length of a plurality of lenses included in the lens group.

Fig. 2A and 2B are schematic views of a partial structure of a display device according to another example of the present embodiment, and fig. 2C is a simplified diagram of a user applying the display device shown in fig. 2A and 2B. As shown in fig. 2A and 2B, the display device further includes an eye tracker 400, and the eye tracker 400 includes a camera 410 and an infrared light source 420.

For example, as shown in fig. 2A, the eye tracker 400 is located on a side of the liquid crystal display panel 100 facing the eyepiece 300.

For example, as shown in fig. 2A, the eye tracker 400 may be located on a side of the eyepiece 300 away from the liquid crystal display panel 100, that is, the eye tracker 400 may be located between the eyepiece 300 and the eye 3000 to track the eye 3000. The embodiment of the present disclosure schematically shows that the eyeball tracker is located between the eyepiece and the eyeball, but is not limited thereto, and the eyeball tracker may also be located between the eyepiece and the liquid crystal display panel, or a connection line between a geometric center of the eyepiece and a geometric center of the eyeball tracker (such as a geometric center of the camera or a geometric center of the infrared light source) is substantially perpendicular to an optical axis of the eyepiece, and the like. The embodiment of the present disclosure does not limit the specific position of the eyeball tracker, as long as the eyepieces do not obstruct the tracking of the eyeball tracker to the position of the eyeball.

For example, as shown in fig. 2A, the display device further includes an eyeball detector 600 connected to the eyeball tracker 400 to receive data of an image captured by the camera 410 and determine plane information of the gaze point of the eyeball 3000 based on the data, the plane information being position information of the gaze point in an image plane where the gaze point is located. That is, the eyeball tracker 400 and the eyeball detection portion 600 are used to obtain plane information of the fixation point by detecting the pupil position. The display device including the eyeball tracker and the eyeball detection portion provided by the present example applies an eyeball tracking technique such as an eyeball tracking technique based on a pupil-cornea reflex method.

For example, the infrared light source 420 may be a ring light source having a plurality of infrared light emitting diodes disposed thereon. After the light emitted by the infrared light source 420 irradiates the eyeball 3000, a reflection spot is generated on the cornea of the eyeball 3000, when the eyeball 3000 focuses on different directions, the center of the pupil changes correspondingly along with the sight line direction, and the position of the reflection point of the cornea is fixed. The camera 410 collects light spots reflected by the eyeball 3000 to realize tracking of the eyeball 200. The eyeball detecting portion 600 may extract the sight line characteristic parameters (for example, the pupil center and the cornea reflection spot center) by using the characteristics of the cornea reflection point, and the position of the falling point of the sight line may be obtained by a corresponding gaze point estimation algorithm, that is, the eyeball detecting portion 600 may obtain the position information of the gaze point of the eyeball in the image plane where the gaze point is located by calculating the eyeball rotation angle, for example, the position information may be coordinate information. For example, a region centered on the gaze point coordinates may be divided according to the circumference or radius of the region in which the gaze point is located. The eyeball detection portion is not limited to be located inside the display device, and the eyeball detection portion may also be a data processor located outside the display device.

For example, as shown in fig. 2A, the orthographic projection of the eyeball tracker 400 on a plane perpendicular to the optical axis of the convex lens 310 does not overlap with the orthographic projection of the eyepiece 300 on the plane to prevent the eyeball tracker 400 from affecting the viewing effect of the user.

For example, as shown in fig. 2C, camera 410 may be located below eyeball 3000 to facilitate tracking of eyeball 3000. For example, camera 410 may be positioned below eyepiece 300 with the axis of camera 410 at an angle to the optical axis of eyepiece 300. The camera 410 has a shooting angle θ, and a shooting area thereof can cover the position of the eyeball 3000. The range encircled by the dotted line circle C shown in fig. 2C should be covered by the shooting area of the camera 410 to achieve the purpose of completely covering the eyeball 3000. The embodiment of the present disclosure is not limited thereto, and the camera may also be located above the eyepiece, or on a side of the eyepiece facing the eyeball, or on a side of the eyepiece away from the eyeball, etc., as long as the shooting area of the camera can cover the position of the eyeball.

According to the fixation point characteristics of human eyes, the resolution of the foveal region of the retina is highest, and the resolution of the peripheral regions is sequentially reduced. When the eyeball rotates, an object which is wanted to be seen clearly is imaged in the fovea region of the retina, and surrounding objects are imaged around the fovea region of the retina, so that the human eye can only see the object in the region of the fixation point and can not see the objects around the fixation point. Generally, the included angle between the high definition area range around the fixation point and the pupils of the human eyes is 5 degrees, and the resolution of the human eyes to the area which takes the fixation point as the center of a circle and has the included angle with the pupils of the human eyes of more than 5 degrees is rapidly reduced.

For example, as shown in fig. 2A and 2B, the display apparatus further includes a controller 500, the controller 500 being connected to the eyeball detecting section 600 and the liquid crystal display panel 100, and configured to adjust, according to the plane information, a display resolution at the gaze point position within the image plane to be larger than a display resolution of an area outside the gaze point within the image plane. The embodiment of the present disclosure is not limited to the control part being located inside the display device, and the control part may also be a data processor located outside the display device.

For example, the controller 500 receives plane information at the gaze point position in the eye detecting section 600, and renders an image displayed on the liquid crystal display panel 100 based on the plane information. For example, a first resolution is selected for rendering at the gazing point position in the image plane, and a second resolution is selected for rendering at a region outside the gazing point in the image plane, wherein the first resolution is higher than the second resolution so as to realize that the gazing area where the gazing point is located is a high-definition region, and the region outside the gazing point is a non-high-definition region. For example, the first resolution may be 1440 × 1440 and the second resolution may be 1080 × 1080.

For example, the controller 500 may include an image processor, and the above-described rendering work may be performed by the image processor. When the high resolution is selected, the image processor selects more pixels to display the image so that the image is finer and smoother, and when the low resolution is selected, the image processor selects less pixels to display the image.

For example, the controller may refer to a hardware implementation of the control function, that is, a person skilled in the art may build a corresponding hardware circuit to implement the control function without considering the cost. For example, the hardware circuits may comprise conventional Very Large Scale Integration (VLSI) circuits or gate arrays and conventional semiconductors such as logic chips, transistors, or other discrete components. For example, the controller may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices, etc., which are not limited in this embodiment.

According to the embodiment of the disclosure, the eyeball tracking technology is applied to the display device comprising the direct type backlight source and the liquid crystal display panel, on the basis of improving the contrast of a display picture through local dynamic backlight adjustment, the position of a fixation point can be rendered to realize local high-definition display, and therefore the data transmission requirement is reduced.

Fig. 3A is a schematic structural diagram of a virtual reality display system according to another embodiment of the present disclosure, and fig. 3B is a schematic structural diagram of each part of the virtual reality display system shown in fig. 3A. As shown in fig. 3A and 3B, a virtual reality display system provided by an embodiment of the present disclosure may include the display device provided by the above-described embodiment.

For example, as shown in fig. 3A and 3B, the virtual reality display system includes a housing 2000.

For example, in an example of the embodiment of the present disclosure, a display device (shown in fig. 1A) in a virtual reality display system includes a liquid crystal display panel 100, a direct-type backlight 200 located on a light incident side of the liquid crystal display panel 100, and an eyepiece 300 located on a light exiting side of the liquid crystal display panel 100. Eyepiece 300 includes a convex lens 310, and both surfaces 311 of convex lens 310 are smooth surfaces. The virtual reality display system provided by this example uses a liquid crystal display panel using a direct type backlight as a light source in cooperation with a convex lens including two smooth surfaces to prevent a glare phenomenon caused by a high-contrast picture on the basis of improving the contrast of a display picture through local dynamic backlight adjustment. The display device in this example may be a head mounted virtual reality display device.

For example, in another example of the embodiment of the present disclosure, the display device (shown in fig. 2A and 2B) in the virtual reality display system includes the liquid crystal display panel 100, the direct-type backlight 200, the eyepiece 300, the eyeball tracker 400 (including the camera 410 and the infrared light source 420), the eyeball detector 600, and the controller 500, which are all located within the housing 2000. In the virtual reality display system in this example, the eyeball tracking technology is applied to the display device including the direct type backlight source, the liquid crystal display panel and the eyepiece with all surfaces being smooth surfaces, on the basis of improving the contrast of a display picture through local dynamic backlight adjustment, the glare phenomenon caused by a high-contrast picture can be reduced, and local high-definition display can be realized through rendering the position of the gazing point, so that the data transmission requirement is reduced.

For example, as shown in fig. 3A and 3B, in still another example of the embodiment of the present disclosure, the display device further includes a signal transmission part 2400, and the virtual reality display system may include a liquid crystal display panel 100 located inside a housing 2000, a direct-type backlight 200, an eyepiece 300, an eye tracker 400 (including a camera 410 and an infrared light source 420), the signal transmission part 2400, and a data processor 4000 located outside the housing 2000.

For example, as shown in fig. 3A and 3B, the data processor 4000 is connected to the signal transmission part 2400. The signal transmitting part 2400 is connected with the eyeball tracker 400 to transmit data of an image photographed by the camera 410 to the data processor 4000, and the data processor 4000 is configured to determine plane information of a gaze point of an eyeball according to the data and transmit an adjustment instruction to the signal transmitting part 2400 according to the plane information. The plane information is the position information of the gazing point in the image plane displayed by the liquid crystal display panel 100, and the data processor in this example includes the function and principle of the eyeball detecting portion 600 in the display device shown in fig. 2A and 2B, which will not be described again here.

For example, as shown in fig. 3A and 3B, the signal transmission section 2400 is connected to the liquid crystal display panel 100, and transmits the above-described adjustment instruction to the liquid crystal display panel 100 to adjust the display resolution at the gazing point position within the image plane to be larger than the display resolution in the region outside the gazing point within the image plane. The data processor in this example also includes the role and principle of the controller 500 in the display device shown in fig. 2A and 2B, and will not be described in detail here.

For example, as shown in fig. 3A and 3B, the data processor 4000 is further configured to be connected to a driving circuit in the direct type backlight to adjust the light emission intensity of the plurality of light emitting diodes according to the image information displayed by the liquid crystal display panel 100. The process of adjusting the light emitting intensity of the light emitting diode by the data processor in this example is the same as the process of adjusting the light emitting diode 210 shown in fig. 1B, and is not described herein again.

For example, the data processor 4000 provided in this example may be a computer or a mobile phone.

For example, the signal transmission unit 2400 in this example may be a Printed Circuit Board (PCBA) integrated with various electronic devices, and the embodiment of the present disclosure is not limited thereto.

For example, as shown in fig. 3A and 3B, the signal transmitting part 2400 is connected to the data processor 4000 through a data line 2500.

For example, as shown in fig. 3B, the signal transmission part 2400 may be disposed on a heat dissipation plate to meet the heat dissipation requirement of the signal transmission part 2400 during operation.

For example, as shown in fig. 3A and 3B, the eyepiece 300 includes a first eyepiece 301 and a second eyepiece 302 corresponding to the left and right eyes of a human eye, respectively, the number of the liquid crystal display panels 100 is one, and includes a first display region 101 and a second display region 102 corresponding to the first eyepiece 301 and the second eyepiece 302, respectively. A single liquid crystal display device 1200 including the liquid crystal display panel 100 and the direct type backlight 200 shown in fig. 1A includes two display regions, an image displayed in the first display region 101 enters one of left and right eyes through the first eyepiece 301, an image displayed in the second display region 102 enters the other of the left and right eyes through the second eyepiece 302, and thus a three-dimensional virtual image can be seen by human eyes.

For example, a single display is not limited to the case where the display area is divided into two display areas corresponding to the two eyes, respectively, but may include only one display area, and parallax may be generated by setting the odd frame image and the even frame image to display different images by making only the odd frame image displayed by the display area visible to one of the left and right eyes and only the even frame image displayed by the display area visible to the other of the left and right eyes.

For example, as shown in fig. 3A and 3B, the eyepiece 300 includes a first eyepiece 301 and a second eyepiece 302 corresponding to the left and right eyes of the human eye, respectively, the number of the liquid crystal display panels 100 may be at least two, and the present example schematically shows that the number of the liquid crystal display panels 100 is two, includes the first liquid crystal display panel 103 and the second liquid crystal display panel 104, and corresponds to the first eyepiece 301 and the second eyepiece 302, respectively. The number of the liquid crystal display devices 1200 including the liquid crystal display panel 100 and the direct type backlight 200 shown in fig. 1A is two, an image displayed on the first liquid crystal display panel 103 enters one of the left and right eyes through the first eyepiece 301, an image displayed on the second liquid crystal display panel 104 enters the other of the left and right eyes through the second eyepiece 302, and then a three-dimensional virtual image can be seen by human eyes.

However, the embodiments of the present disclosure are not limited thereto, and the number of the liquid crystal display panels may also be four, six, or more as long as the number of the liquid crystal display panels is an even number, and the number of the liquid crystal display panels respectively corresponding to the first eyepiece and the second eyepiece is the same. When the number of the liquid crystal display panels is larger than two, the liquid crystal display panel corresponding to the first eyepiece is a first group of liquid crystal display panels, the liquid crystal display panel corresponding to the second eyepiece is a second group of liquid crystal display panels, the liquid crystal display panels included by the first group of liquid crystal display panels are in one-to-one correspondence with the liquid crystal display panels included by the second group of liquid crystal display panels, the image planes of the two corresponding liquid crystal display panels respectively located in the two groups of liquid crystal display panels are located in the same depth of field, and the first group of liquid crystal display panels and the second group of liquid crystal display panels are configured to respectively correspond to two eyes so as to realize binocular stereoscopic display.

It should be noted that when the number of the liquid crystal display panels is plural, each liquid crystal display panel corresponds to one direct type backlight source to form one liquid crystal display, and the virtual reality display system may include at least two liquid crystal displays.

For example, as shown in fig. 3B, the housing 2000 of the virtual reality display system includes a rear housing 2100 and a front housing 2600. The back shell 2100 is the shell that faces the user when using the virtual reality display system. When the virtual reality display system is a head-mounted device, the back shell is an outer shell that contacts the user's head.

For example, as shown in fig. 3B, the virtual reality display system further includes a lens barrel 2200 for placing the eyepiece 300 and a holder 2300 for placing the liquid crystal display 1200.

In the virtual reality display system in this example, the eyeball tracking technology is applied to the display device including the direct type backlight source, the liquid crystal display panel and the eyepiece including the convex lens, on the basis of improving the contrast of a display picture through local dynamic backlight adjustment, the glare phenomenon caused by a high-contrast picture can be reduced, and local high-definition display can be realized through rendering the position of the gazing point, so that the data transmission requirement is reduced.

The following points need to be explained:

(1) in the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.

(2) Features of the same embodiment of the disclosure and of different embodiments may be combined with each other without conflict.

The above are merely exemplary embodiments of the present disclosure and are not intended to limit the scope of the present disclosure, which is defined by the appended claims.

Claims (14)

1. A display device, comprising:

a liquid crystal display panel;

the direct type backlight source is positioned at the light incidence side of the liquid crystal display panel; and

an eyepiece positioned at a light exit side of the liquid crystal display panel to magnify an image displayed by the liquid crystal display panel,

wherein, the eyepiece includes convex lens, two surfaces of convex lens are smooth surface.

2. The display device of claim 1, wherein one of the two surfaces of the convex lens is a generally outwardly convex surface and the other is a generally outwardly convex, generally inwardly concave surface or a flat surface.

3. The display device according to claim 1, wherein a display screen of the liquid crystal display panel is located within one focal length of the eyepiece.

4. The display device according to claim 1, wherein a sum of thicknesses of the liquid crystal display panel and the direct type backlight is less than 2.8 mm.

5. The display device according to claim 4, wherein the direct type backlight source comprises a plurality of light emitting diodes arranged in an array along a row direction and a column direction, at least one of the plurality of light emitting diodes has a dimension along the row direction and the column direction of no more than 500 μm, and a distance between centers of two adjacent light emitting diodes in the row direction and a distance between centers of two adjacent light emitting diodes in the column direction of no more than 1.4 mm.

6. The display device according to claim 5, wherein the direct type backlight further comprises a driving circuit connected to the plurality of light emitting diodes, and the driving circuit is configured to adjust the light emission intensity of the plurality of light emitting diodes.

7. The display device according to any one of claims 1 to 6, wherein the display device is a head-mounted virtual reality display device.

8. The display device according to any one of claims 1 to 6, further comprising:

the eyeball tracker is located on one side, facing the eyepiece, of the liquid crystal display panel, wherein the eyeball tracker comprises a camera and an infrared light source.

9. The display device according to claim 8, further comprising:

the eyeball detection part is connected with the eyeball tracker to receive data of the image shot by the camera and determine plane information of a fixation point of the eyeball according to the data, wherein the plane information is position information of the fixation point in an image plane displayed by the liquid crystal display panel; and

a controller connected to the eyeball detecting part and the liquid crystal display panel, and configured to adjust a display resolution at the position of the gaze point within the image plane to be greater than a display resolution of an area outside the gaze point within the image plane according to the plane information.

10. A virtual reality display system comprising the display apparatus of any one of claims 1 to 4.

11. The virtual reality display system of claim 10, wherein the direct-type backlight source comprises a plurality of light emitting diodes arranged in an array along a row direction and a column direction, and a driving circuit connected to the plurality of light emitting diodes;

the display device comprises an eyeball tracker which is positioned on one side of the liquid crystal display panel facing the eyepiece, and the eyeball tracker comprises a camera and an infrared light source;

wherein the virtual reality display system further comprises:

a signal transmission part located in the display device; and

a data processor located outside the display device, the data processor being connected to the signal transmission portion,

wherein the signal transmission part is connected with the eyeball tracker to transmit data of the image shot by the camera to the data processor, the data processor is configured to determine plane information of a fixation point of an eyeball according to the data, the plane information is position information of the fixation point in an image plane displayed by the liquid crystal display panel, and an adjustment instruction is sent to the signal transmission part according to the plane information;

the signal transmission part is connected with the liquid crystal display panel and transmits the adjusting instruction to the liquid crystal display panel so as to adjust that the display resolution at the position of the fixation point in the image plane is larger than the display resolution of the area outside the fixation point in the image plane;

the data processor is also configured to be connected with a driving circuit in the direct type backlight source so as to adjust the light emitting intensity of the plurality of light emitting diodes according to the image information displayed by the liquid crystal display panel.

12. The virtual reality display system of claim 11, further comprising a housing, the display device being located within the housing, the data processor being located outside the housing.

13. The virtual reality display system of any one of claims 10 to 12, wherein the eyepiece comprises a first eyepiece and a second eyepiece corresponding to left and right eyes of a human eye, respectively, the number of the liquid crystal display panels is one, and two display regions corresponding to the first eyepiece and the second eyepiece, respectively.

14. The virtual reality display system of any one of claims 10 to 12, wherein the eyepieces comprise a first eyepiece and a second eyepiece corresponding to left and right eyes of a human eye, respectively, the number of the liquid crystal display panels is at least two, and the number of the liquid crystal display panels corresponding to the first eyepiece and the second eyepiece, respectively, is the same.

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