TW201932919A - Display device - Google Patents

Abstract

A display device including a display device, a lens, an infrared light source, an infrared sensor, a hot mirror and a first anti-reflection layer is provided. The display device has a display surface used for emitting a visible light beam to eyes of a user. The lens is disposed between the display surface of the display device and the eyes of the user, and the lens is located on a transmission path of the visible light beam. The infrared light source is used for emitting an infrared beam to the eyes. The infrared sensor is disposed on a transmission path of the infrared beam reflected by the eyes. The hot mirror is disposed between the display surface of the display device and the infrared light source. The hot mirror can reflect the infrared beam, and at least one portion of the visible beam can passes through the hot mirror. The first anti-reflection layer is located on one of the display surface and the hot mirror, and the first anti-reflection layer is used for reducing a reflection of the visible light beam.

Description

Display device

The present invention relates to an optical device, and more particularly to a display device.

Head mounted displays (HMDs) can be used as display devices for Augmented Reality (AR) or Virtual Reality (VR). When a head-mounted display is applied to a virtual reality, it can make users feel immersive and immersive, so it is loved by many people today. An immersive head-mounted display is mainly composed of a display element and a lens, and an image beam is transmitted from the display element to the user's eyes through the lens. However, part of the image beam is susceptible to reflection between the lens and the display element during the transmission process, and allows the user to view unnecessary image information, that is, ghost image. Therefore, there is a great need to design a display device capable of improving the ghost phenomenon to enhance the user's visual experience.

The invention provides a display device, which can improve the ghost phenomenon and enhance the user's visual experience.

The display device of the present invention includes a display element, a lens, an infrared light source, an infrared sensor, a heat mirror, and a first anti-reflection layer. The display element has a display surface for emitting a visible light beam to a user's eyes. The lens is disposed between the display surface of the display element and the eyes, and is located on the transmission path of the visible light beam. The infrared light source is used to emit an infrared beam to the eyes. The infrared sensor is disposed on a transmission path of an infrared light beam reflected by the eye. The heat mirror is disposed between the display surface of the display element and the infrared light source. The heat mirror can reflect the infrared light beam, and at least part of the visible light beam can pass through the heat mirror. The first anti-reflection layer is located on one of the display surface and the heat mirror, and is used to suppress reflection of visible light beams.

In an embodiment of the present invention, the heat mirror has a first surface and a second surface opposite to the first surface, wherein the first surface is closer to the display surface than the second surface, and the first anti-reflection layer is disposed on the heat surface. On the first surface of the mirror.

In an embodiment of the present invention, the display device further includes a second anti-reflection layer, wherein the second anti-reflection layer is located on the display surface of the display element and the other of the heat mirror.

In one embodiment of the present invention, the anti-reflection layer is an interference film.

In an embodiment of the present invention, the above-mentioned heat mirror has a first surface opposite to the display surface, and the first surface of the heat mirror is at an acute angle with the display surface of the display element.

In an embodiment of the present invention, the heat mirror is disposed between the display surface of the display element and the lens.

In an embodiment of the present invention, the infrared light beam reflected by the eye sequentially penetrates the lens, is reflected by the heat mirror, and is received by the infrared sensor.

Based on the above, a display device according to an embodiment of the present invention uses an anti-reflection layer provided on at least one of a display element and a heat mirror to suppress reflection of a visible light beam (or image light beam), thereby improving ghosting and improving Visual perception of the user.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. Referring to FIG. 1, the display device 100 includes a display element 110, a lens 120, an infrared light source 140, an infrared sensor 150, a heat mirror 130, and a first anti-reflection layer 160. The display element 110 has a display surface 112 for emitting a visible light beam L1 to the eyes 10 of the user. In this embodiment, the display element 110 may be a liquid crystal display (Liquid Crystal Display; LCD), an organic light emitting diode (Organic Light Emitting Diode) display element, or other types of display elements. In this embodiment, the visible light beam L1 carries image information, and the visible light beam L1 may also be referred to as an image light beam.

The lens 120 is disposed between the display surface 112 of the display element 110 and the eye 10, and is located on a transmission path of the visible light beam L1. The eye 10 can perceive an enlarged virtual image corresponding to the image information carried by the visible light beam L1 through the lens 120, thereby generating the effect of a virtual reality. In this embodiment, the lens 120 may be a single or a combination of multiple lenses. However, the present invention is not limited thereto, and according to other embodiments, the lens 120 may further include other optical members other than the lens.

The infrared light source 140 is used to emit an infrared light beam L2 to the eye 10. In this embodiment, the wavelength of the infrared light beam L2 may be in a range of 760 nanometers (nm) to 1 millimeter (mm). In this embodiment, the infrared light source 140 may be selectively disposed around the eye 10. However, the present invention is not limited thereto. According to other embodiments, the infrared light source 140 may be selectively disposed at other appropriate positions. In addition, FIG. 1 depicts two infrared light sources 140 as an example, but the present invention is not limited thereto. The number of infrared light sources 140 can be adjusted according to actual needs.

The infrared sensor 150 is disposed on a transmission path of the infrared light beam L2 reflected by the eye 10. The infrared sensor 150 detects changes in the infrared light beam L2 reflected by the eye 10, and the user can interact with the display device 100 through the rotation of the eyeball 10, for example, changing the viewing angle of the scene, and clicking a menu on the display screen. In this embodiment, the infrared light beam L2 emitted by the infrared light source 140 may be sequentially reflected by the eye 10 and the thermal mirror 130, and the infrared sensor 150 may be selectively disposed on a side of the thermal mirror 130 near the user's eye 10 To receive and transmit the infrared light beam L2 reflected by the heat mirror 130. However, the present invention is not limited thereto. According to other embodiments, the infrared sensor 150 may also be disposed at other appropriate positions. The infrared sensor 150 is also called an infrared camera. In this embodiment, the infrared sensor 150 may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor; CMOS) photosensitive element or a charge coupled device (CCD) capable of sensing the infrared beam L2, but The invention is not limited to this.

In this embodiment, the infrared sensor 150 is used to track the direction in which the user's eyes 10 are gazing, so that the display device 100, such as an immersive head-mounted display, provides real-time dynamic feedback to allow the user's The virtual reality experience is more natural and smooth.

In this embodiment, the heat mirror 130 may be disposed between the display surface 112 of the display element 110 and the infrared light source 140. More specifically, the heat mirror 130 may be disposed between the display surface 112 of the display element 110 and the lens 120. The heat mirror 130 can reflect the infrared light beam L2, and at least part of the visible light beam L1 can pass through the heat mirror 130. In this embodiment, the heat mirror 130 may also be referred to as an IR cut filter. The material of the heat mirror 130 is, for example, a dielectric material or a dichroic material. The invention is not limited to this.

The heat mirror 130 has a first surface 132 and a second surface 134 opposite to the first surface 132, wherein the first surface 132 is closer to the display surface 112 than the second surface 134. In this embodiment, the first surface 132 of the heat mirror 130 and the display surface 112 of the display element 110 may include an acute angle. In other words, in this embodiment, the heat mirror 130 may be inclined with respect to the display surface 112 of the display element 110, but the invention is not limited thereto.

The first anti-reflection layer 160 is located on one of the display surface 112 and the heat mirror 130 of the display element 110 and is used to suppress reflection of the visible light beam L1. In this embodiment, the first anti-reflection layer 160 may be selectively disposed on the first surface 132 of the heat mirror 130. However, the present invention is not limited thereto. In another embodiment, the first anti-reflection layer 160 may be disposed on the display surface 112 of the display element 110. For example, in this embodiment, the first anti-reflection layer 160 may be an interference film capable of causing destructive interference with respect to the wavelength of the visible light beam L1. However, the present invention is not limited thereto. In other embodiments, the first anti-reflection layer 160 may be another kind of anti-reflection layer.

It is worth mentioning that through the arrangement of the first anti-reflection layer 160, it is possible to suppress the back and forth reflection of the visible light beam L1 between the heat mirror 130 and the display element 110, thereby improving the ghost phenomenon and allowing the user to see a clear image. Improve visual experience.

FIG. 2 is a schematic diagram of a display device according to another embodiment of the present invention. Please refer to FIGS. 1 and 2. The display device 100A of FIG. 2 is similar to the display device 100 of FIG. 1. The main difference between the two is that the display device 100A includes a second anti-reflection layer 170 in addition to the first anti-reflection layer 160. The second anti-reflection layer 170 is disposed on the first surface 132 of the heat mirror 130. In this embodiment, since the first surface 132 of the heat mirror 130 and the display surface 112 of the display element 110 are each provided with an anti-reflection layer (ie, the first reflection layer 160 and the second reflection layer 170) capable of suppressing reflection of the visible light beam L1 Therefore, the back-and-forth reflection of the visible light beam L1 between the heat mirror 130 and the display element 110 can be further reduced, and the ghost phenomenon and the visual experience can be significantly improved.

FIG. 3 shows the average grayscale value of a single pixel, the rate of change of grayscale values, and the use of simulation in a display device of a comparative example, a display device 100 of a first embodiment, and a display device 100A of a second embodiment. Image viewed by a person through a display device. Please refer to FIGS. 1, 2 and 3. The display device 100 of the first embodiment listed in FIG. 3 is the display device 100 of FIG. 1, and the display device 100A of the second embodiment listed in FIG. 3 is the display of FIG. 2. Device 100A. The display device (not shown) of the comparative example is similar to the display device 100 of FIG. 1. The difference between the two is that the display device of the comparative example does not include the first anti-reflection layer 160 of the display device 100 of FIG. 1.

Please refer to FIG. 3, the area R shows the image information (for example, Acer) carried by the visible light beam L1 directly emitted from the display surface 112, the area RIO is a ghost test area, and the average grayscale value of a single pixel of the area ROI The definition is as the following formula (1): the average grayscale value of a single pixel of the regional ROI = (the sum of the grayscale values of all pixels of the regional ROI / the number of all pixels of the regional ROI), and the change of the average grayscale value The rate is defined as the following formula (2): the change rate of the average grayscale value = (the average grayscale value of a single pixel of the regional ROI of each case-the average grayscale value of a single pixel of the regional ROI of the comparative example) / comparison The average gray level value of a single pixel of the region ROI.

According to the simulation result in FIG. 3, if at least one of the display element 110 and the heat mirror 130 is provided with an anti-reflection layer (such as the display devices 100 and 100A of the first and second embodiments), the ghost presented by the area RIO appears. Shadow brightness is significantly reduced. The simulation results shown in FIG. 3 can prove that: providing an anti-reflection layer on at least one of the display element 110 and the heat mirror 130 can indeed improve the ghost phenomenon and enhance the visual experience.

In summary, a display device of the present invention utilizes an anti-reflection layer disposed on at least one of the display element and the heat mirror to suppress the back and forth reflection of the visible light beam between the heat mirror and the display element, thereby improving the ghost phenomenon. Improve visual perception.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

10‧‧‧ eyes

100, 100A‧‧‧ display device

110‧‧‧Display element

112‧‧‧display surface

120‧‧‧ lens

130‧‧‧heat mirror

132‧‧‧first surface

134‧‧‧Second surface

140‧‧‧ infrared light source

150‧‧‧ infrared sensor

160‧‧‧The first anti-reflection layer

170‧‧‧Second anti-reflection layer

L1‧‧‧visible beam

L2‧‧‧ infrared beam

R, ROI‧‧‧ area

FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. FIG. 2 is a schematic diagram of a display device according to another embodiment of the present invention. FIG. 3 shows the average grayscale value of a single pixel, the rate of change of grayscale values, and the simulated user transmission of a single pixel in the display device of the comparative example, the display device of the first embodiment, and the display device of the second embodiment. The image viewed by the display device.

Claims (7)

A display device includes: a display element having a display surface for emitting a visible light beam to an eye of a user; a lens disposed between the display surface of the display element and the eye, And located on the transmission path of the visible light beam; an infrared light source for emitting an infrared light beam to the eye; an infrared sensor disposed on the transmission path of the infrared light beam reflected by the eye; a heat mirror configured Between the display surface of the display element and the infrared light source, wherein the heat mirror can reflect the infrared light beam, and at least a part of the visible light beam can pass through the heat mirror; and a first anti-reflection layer is located on the display surface And one of the heat mirrors to suppress reflection of the visible light beam. The display device according to item 1 of the patent application scope, wherein the heat mirror has a first surface and a second surface opposite to the first surface, wherein the first surface is closer to the display surface than the second surface. , And the first anti-reflection layer is disposed on the first surface of the heat mirror. The display device according to item 1 of the patent application scope further includes a second anti-reflection layer, wherein the second anti-reflection layer is located on the display surface of the display element and the other of the heat mirror. The display device according to item 1 of the application, wherein the anti-reflection layer is an interference film. The display device according to item 1 of the patent application scope, wherein the heat mirror has a first surface opposite to the display surface, and the first surface of the heat mirror and the display surface of the display element have an acute angle therebetween. The display device according to item 1 of the scope of patent application, wherein the heat mirror is disposed between the display surface of the display element and the lens. The display device according to item 6 of the scope of patent application, wherein the infrared light beam reflected by the eye sequentially penetrates the lens, is reflected by the heat mirror, and is received by the infrared sensor.