KR101373313B1 - See through display device and control method thereof - Google Patents

Abstract

Disclosed are a see-through display apparatus and a method thereof. The disclosed see-through display apparatus includes: an image generating unit for generating an image; an optical unit for enlarging and transferring the image which is transmitted from the image generating unit; a display unit for transferring a synthesized image to a viewer by passing a real image and reflecting the image transmitted from the optical unit; an ultraviolet light generating unit for emitting ultraviolet light to the display unit; and a control unit which controls the amount of ultraviolet irradiation in the ultraviolet light generating unit and the brightness of the image in the image generating unit according to the amount of external light.

Description

Transparent display device and control method thereof {SEE THROUGH DISPLAY DEVICE AND CONTROL METHOD THEREOF}

The present invention relates to a transmissive display device and a control method thereof, and more particularly, to a transmissive display device and a method of controlling the same so that an image and a background can be seen at the same time by adjusting the transmittance of the display unit according to external brightness.

In general, a head up display (HUD) displays information of a vehicle and driving information to a driver through a wind shield located in front of the driver, thereby minimizing the driver's gaze while driving and distributing information to prevent distraction. It is a device to provide.

The configuration of the HUD has an image source such as an LCD (Liquid Crystal Display) for generating an image, and an optical system for forming an image generated from such an image source at an appropriate distance and an effective focal length. And the interface part for the driver's adjustment.

A typical HUD system is located under the bonnet of an automobile and uses an LCD that uses a light source as a back light to make an image, and the focal length and image size of the image generated from the image source. Is installed inside the dashboard of the car and reflects the image passing through the optical system to the wind shield located in front of the driver. It includes a reflection mirror to make it visible.

On the other hand, Korean Patent Laid-Open Publication No. 2005-0010429 (published: 2005.01.27) discloses a "head up display image positioning device".

SUMMARY OF THE INVENTION An object of the present invention is to provide a transmissive display apparatus and a control method thereof, by which ultraviolet rays are exposed to a display unit according to external brightness to adjust the transmittance of the display unit to simultaneously view an information image and a background.

The transmission display device according to the present invention comprises: an image generating unit for generating an image, an optical unit for enlarging and transmitting an image received from the image generating unit, a real image and transmitting an image and reflecting the image received from the optical unit And a control unit for controlling the UV irradiation amount of the UV generation unit and the image brightness of the image generation unit by interlocking with the display unit for transmitting the composite image to the observer, the UV generation unit for irradiating the UV light to the display unit, and the amount of external light. It is characterized by including.

The display unit may include a photochromic window having a characteristic of changing transmittance by ultraviolet rays and a color-selection filter layer provided in the photochromic window.

In addition, the color-selective filter layer is characterized in that it is attached or coated in the form of a film on at least one of the one or the other surface of the photochromic window.

In addition, the color filter layer is characterized in that provided on the surface closer to the observer of the photochromic window.

In addition, the color filter layer is characterized in that the transmittance of ultraviolet light is higher than the transmittance of visible light.

In addition, the ultraviolet light emitted from the ultraviolet generation unit is characterized in that the incident light toward the surface closer to the observer of the photochromic window.

In addition, the photochromic window is characterized in that it is produced by applying a photochromic material such as photochromic glass, photochromic plastic.

In addition, the photochromic window is characterized in that it comprises a transparent window, a photochromic filter layer attached or coated in the form of a film on at least one of the one or the other surface of the transparent window.

In addition, the photochromic filter layer is characterized in that it is farther from the viewer than the color screening filter layer.

In addition, the dichroic filter layer is characterized in that it is attached or coated in the form of a film on the side of the photochromic window far from the viewer to prevent the external ultraviolet ray is incident to the photochromic window.

In addition, the color filter layer is characterized in that the transmittance of visible light is higher than the transmittance of ultraviolet light.

In addition, the ultraviolet rays of the ultraviolet generation unit is characterized in that the light transmitted through the optical unit to the photochromic window.

In addition, the ultraviolet generating unit is characterized in that the ultraviolet light is positioned so as to project one or more of the front, rear and all sides of the photochromic window.

In addition, it characterized in that it comprises a light sensor for sensing the amount of external light.

In addition, the control method of the transparent display device according to an embodiment of the present invention includes the steps of (a) input the external brightness to the control unit, (b) comparing the input value and the reference value of the external brightness, (c) input Adjusting the transmittance of the display unit by adjusting the amount of ultraviolet radiation according to the difference between the value and the reference value, (d) irradiating the image to the display unit, and (e) comparing the contrast value of the display unit with a reference contrast value. And (f) adjusting the brightness of the image according to the difference between the contrast value and the reference contrast value of the display unit.

In addition, the step (c) is characterized in that if the input value is higher than the reference value, the amount of ultraviolet radiation emitted from the ultraviolet generation unit is increased, and if the input value is lower than the reference value, it is characterized in that the amount of ultraviolet radiation emitted from the ultraviolet generation unit.

In addition, when the contrast value of the display unit matches the reference value, the transmittance of the display unit and the brightness of the image may be maintained.

In addition, when the external brightness is changed after the step (f), the steps (a), (b), (c), (d), (e), and (f) are sequentially performed.

According to the present invention, a transmissive display device and a control method thereof may be configured to expose an ultraviolet ray to a display unit by applying an ultraviolet ray generator to freely adjust the transmittance of the display unit, and to adjust contrast without being influenced by external light. It has the effect of seeing both the background and the background at the same time.

In addition, the present invention by applying a light sensor can detect the brightness of the visible light flowing from the outside to automatically adjust the UV irradiation amount and the image irradiation amount has the effect of controlling the contrast with the external brightness.

In addition, the present invention can reduce the internal reflectance by appropriately lowering the transmittance of the display unit even at night has the effect of minimizing ghost.

1 is a view showing a transmissive display device according to an embodiment of the present invention;
2 is a view showing the operation of the display unit of the transparent display device according to an embodiment of the present invention,
3 is a view illustrating ghost minimization of a transmissive display device according to an embodiment of the present invention;
4 is a view showing the operation of the display unit and the ultraviolet generation unit of the transmission display device according to an embodiment of the present invention,
5 is a view showing the action of the color filter layer of the transmission display device according to an embodiment of the present invention,
6 is a view showing a first modified example of a display unit of a transmissive display device according to an embodiment of the present invention;
7 is a view showing a second modification of the display unit of a transmissive display device according to an embodiment of the present invention;
8 is a view showing a third modified example of a display unit of a transmissive display device according to an embodiment of the present invention;
9 is a view showing a first modification of the ultraviolet generation unit of the transmissive display device according to an embodiment of the present invention;
10 is a view showing a second modification of the ultraviolet generation unit of the transmissive display device according to an embodiment of the present invention;
11 is a photograph showing a field of view of an observer by a transmissive display device according to an embodiment of the present invention;
12 is a flowchart illustrating a control method of a transparent display device according to an embodiment of the present invention.

Hereinafter, an embodiment of a transmissive display device and a control method thereof according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 to 12, a transmissive display apparatus 100 according to an exemplary embodiment of the present invention includes an image generator 110, an optical unit 120, a display unit 130, an ultraviolet generator 140, and The controller 150 is included.

The present embodiment relates to a transmissive display apparatus 100 that provides safety of a driver and effectively transmits driving information and surrounding situation information of a vehicle to the driver.

The image generating unit 110 generates an image and irradiates the generated image to the display unit 130 to be described later. The image generated by the image generator 110 may be configured in various ways such as vehicle driving information and surrounding situation information.

The optical unit 120 is provided between the image generating unit 110 and the display 130 to enlarge the image received from the image generating unit 110 and transmit the enlarged image to the display 130. The optical unit 120 may include a plurality of lenses, and the image generated by the image generator 110 may be enlarged and transmitted through the optical unit 120, thereby reducing the volume of the image generator 110.

The display unit 130 transmits the real image, reflects the image received from the optical unit 120, and delivers the composite image to the viewer. The display unit 130 includes a photochromic window 132 and a color-selection filter layer 135 provided in the photochromic window 132 having a characteristic of changing transmittance by ultraviolet rays.

The photochromic window 132 is characterized by being colored by the energy of incident light (ultraviolet wavelength band), thereby changing the transmittance of light in the visible wavelength range. That is, as shown in Figure 2 has no characteristics of transparent when no ultraviolet light, translucent when a small amount of ultraviolet light, opaque when a large amount of ultraviolet light.

The dichroic filter layer 135 transmits light in the ultraviolet wavelength range and simultaneously transmits light with a constant transmittance and reflectance.

That is, in the absence of UV light, the external light is transmitted / reflected by the color filter layer 135 after the photochromic window 132 is transmitted, and the image generated by the image generator 110 is transmitted / reflected by the color filter layer 135. When there is ultraviolet light, ultraviolet light is transmitted through the color filter layer 135 and absorbed by the photochromic window 132 to color the photochromic window 132, and the external light is absorbed / absorbed by the photochromic window 132. After transmission, the light is transmitted / reflected by the color filter layer 135, and the image generated by the image generator 110 is transmitted / reflected by the color filter layer 135.

The color filter layer 135 is attached or coated in at least one of the one or the other surface of the photochromic window 132 in the form of a film. In this embodiment, the color filtering filter layer 135 is provided on a surface closer to the viewer.

The color filter layer 135 has a transmittance of ultraviolet rays higher than that of visible light, and the characteristics of the color filter layer 135 can be seen in FIG. 5, and as shown in FIG. 4, the transmittance of ultraviolet light must be higher than that of visible light. Only ultraviolet rays generated by the ultraviolet generator 140 may be transmitted to color the photochromic window 132, and the image generated by the image generator 110 may be reflected and transmitted to the viewer.

Ultraviolet rays emitted from the ultraviolet generating unit 140 are incident on the surface of the photochromic window 132 close to the observer.

 Accordingly, as shown in FIGS. 1 and 4, the display unit 130 including the photochromic window 132 and the color filter layer 135 absorbs the ultraviolet wavelength band of external light incident from the outside and is colored. By applying the ultraviolet generating unit 140 to properly expose the ultraviolet to the photochromic window 132, the transmittance can be freely adjusted and the contrast can be adjusted without being influenced by external light.

While general contrast defines the brightness ratio of black / white as contrast, contrast of the transmissive display device 100 such as HUD and HMD defines image brightness as contrast with external light. This is because the human eye responds relatively to ambient brightness, for example, when looking at a mobile phone's LCD screen, it's hard to see under sunlight, but very well at dark nights. The brightness of the LCD itself is constant regardless of day or night, but the pupil size of the eye changes according to the ambient brightness, which changes the amount of light the eye receives.

As another example, when driving at night, turn off the indoor light to see the road well, but turn on the indoor light to see the road. If the brightness of the HUD is made bright at night, it can be very dangerous because the eyes adapt to it, making the outside of the vehicle difficult to see.

The problem is that by exposing the ultraviolet light emitted from the ultraviolet generating unit 140 to the photochromic window 132, it is possible to see the image well without the influence of external light and to minimize the burden on the eyes. In particular, at night, the transmittance of the photochromic window 132 may be appropriately reduced to reduce the internal reflectance, and when the internal reflectance is reduced, the ghost may be minimized.

Looking at the configuration to minimize the ghost, as shown in Figure 3 there is almost no ultraviolet light at night, the photochromic window 132 becomes a transparent ecology image transmitted from the image generating unit 110 surface reflection (A) To generate ghosts. As described above, by exposing the ultraviolet light emitted from the ultraviolet generation unit 140 to the photochromic window 132, the internal reflectance can be reduced to minimize the ghost.

As such, the UV irradiation amount of the UV generator 140 and the image brightness of the image generator 110 are controlled by the controller 150. The controller 150 controls the UV generator 140 and the image generator 110 in association with the amount of external light.

The amount of external light is detected by the light sensor 160, the detection value detected by the light sensor 160 is transmitted to the control unit 150, the amount of ultraviolet radiation of the ultraviolet generating unit 140 and the image generating unit by the detected value The image brightness of 110 is adjusted.

As illustrated in FIGS. 6 to 8, the display 130 may be variously modified.

FIG. 6 illustrates a first modification of the display unit 130. As shown in FIG. 6, the color filtering filter layer 237 is formed on the surface of the photochromic window 132 so as to prevent external ultraviolet rays from entering the photochromic window 132. It is attached or coated in the form of a film on the side away from the viewer. The color separation filter layer 237 has a transmittance of visible light higher than that of ultraviolet light.

The first color filter layer 236 is attached or coated in the form of a film on the inner surface of the photochromic window 132, and the second color filter layer 237 is further provided on the outer surface to completely block external ultraviolet rays to generate ultraviolet light. The transmittance of the display 130 may be adjusted only by the unit 140. In this case, the transmittance of the free display 130 may be directly controlled.

7 and 8 illustrate the second and third modifications of the display unit 130. As shown in the drawing, the display unit 130 includes a photochromic window 232 and a color separation filter layer 135. 232 is a film produced by applying a photochromic material such as photochromic glass, photochromic plastic, and at least one of the transparent window 233 and the transparent window 233 or at least one surface of the transparent window 233. It includes a photochromic filter layer 234 attached or coated in the form of. In this case, the photochromic filter layer 234 is provided farther from the viewer than the color screening filter layer 135.

9 is a first modification of the ultraviolet generation unit 140, as shown in the ultraviolet rays of the ultraviolet generation unit 140 may be transmitted through the optical unit 120 and irradiated to the photochromic window 132. Ultraviolet rays emitted from the ultraviolet generating unit 140 are irradiated to the photochromic window 132 after transmitting the optical unit 120 to change the transmittance. That is, the image generating unit 110 and the ultraviolet generating unit 140 are integrated, and the ultraviolet rays of the ultraviolet generating unit 140 and the image of the image generating unit 110 are transferred to the optical unit 120 to display the display unit 130. Will be investigated.

In addition, FIG. 10 is a second modification of the ultraviolet generating unit 140, as shown in the ultraviolet generating unit 140, the ultraviolet light projecting at least one of the front, rear and all sides of the photochromic window 132. Can be positioned to do so. Ultraviolet rays emitted from the ultraviolet generating unit 140 may be projected onto at least one of the surfaces of the photochromic window 132 to change the transmittance.

Hereinafter, a control method of a transmissive display device according to an embodiment of the present invention having the above structure will be described.

First, the external brightness is input from the controller 150 (S10), the light sensor 160 is provided inside the vehicle to detect the amount of external light from the light sensor 160 to input the external brightness to the controller 150. The value is entered.

Thereafter, the controller 150 compares the input value of the external brightness with a preset reference value (S20). Here, the preset reference value is a value in which the external brightness represents the brightness of the preset light according to the weather or the environment, which may be arbitrarily adjusted by the user.

In addition, the transmittance of the display unit 130 is adjusted by adjusting the amount of ultraviolet irradiation according to the difference between the input value input from the light sensor 160 and the reference value of the controller 150. That is, the ultraviolet rays are irradiated from the ultraviolet generator 140 under the control of the controller 150, and the amount of ultraviolet rays is adjusted according to the external brightness to be irradiated to the display 130.

In this case, the display 130 is a photochromic window 132 having a characteristic that transmittance is changed by ultraviolet light and a color-selection filter layer 135 that transmits light in an ultraviolet wavelength band and simultaneously transmits light in a visible wavelength band with a constant transmission and reflectance. The transmittance may be adjusted according to the external brightness and the irradiation amount of ultraviolet rays emitted from the ultraviolet generating unit 140.

As shown in FIG. 4, the color filtering filter layer 135 is provided on the surface close to the observer in the photochromic window 132 so as to be transmitted to the photochromic window 132 by transmitting ultraviolet rays irradiated from the ultraviolet generating unit 140. The transmittance of the photochromic window 132 can be adjusted.

When the input value is higher than the reference value, the transmittance control of the display 130 increases the amount of ultraviolet irradiation irradiated by the ultraviolet ray generator 140 (S30). When the input value is lower than the reference value, the ultraviolet ray generator 140 is irradiated. It is possible by reducing the dose (S40).

For example, in the daytime, when the image is difficult to see due to the high external brightness, the amount of ultraviolet radiation is increased to properly lower the transmittance of the display unit 130 so that the image is easily visible, and at night, the external brightness is low so that the image is easily visible. On the other hand, if the external environment is difficult to see, reducing the amount of ultraviolet radiation to appropriately increase the transmittance of the display unit 130.

In this case, the internal reflectance may be reduced by appropriately adjusting the transmittance of the display unit 130 by an appropriate amount of ultraviolet radiation at night, thereby minimizing ghost.

As shown in FIG. 10, the ultraviolet generating unit 140 may be positioned to allow ultraviolet rays to project at least one of front, rear, and all sides of the photochromic window 132.

Meanwhile, as illustrated in FIG. 6, the display unit 130 includes a first color filter layer 236 on a surface close to the observer of the photochromic window 132, and a second color filter layer on the surface far from the viewer. 237 may be provided. The first color filter layer 236 has a property of transmitting ultraviolet rays, and the second color filter layer 237 has a property of reflecting ultraviolet rays, thereby irradiating from the ultraviolet generating unit 140 without affecting external brightness. The transmittance can also be adjusted only by the amount of ultraviolet irradiation.

In addition, the photochromic window 232 of the display unit 130 is itself manufactured by applying a photochromic material such as photochromic glass, photochromic plastic, and as shown in FIGS. 7 and 8. The transparent window 233 and the transparent window 233 may be formed of a photochromic filter layer 234 attached to one surface or the other surface or coated. This operation is the same as the display unit 130 composed of the photochromic window 132 and the color filter layer 135 of the present embodiment described above will be replaced with the above description.

As such, when the transmittance of the display 130 is adjusted, the image is irradiated to the display 130 (S50). The image is irradiated from the image generating unit 110 to the display unit 130, the optical unit 120 is provided between the display 130 and the image generating unit 110, the image irradiated from the image generating unit 110 Is enlarged through the optical unit 120 and irradiated to the display unit 130. In addition, when the image generating unit 110 irradiates an image including the vehicle driving information and the surrounding situation information to the display unit 130, the image is reflected by the color filter layer 135 of the display unit 130 to the viewer. Delivered.

In this case, as shown in FIG. 9, the ultraviolet generating unit 140 and the image generating unit 110 may be integrated so that the image and the ultraviolet may be irradiated to the display unit 130 through the optical unit 120.

Thereafter, the controller 150 compares the contrast value of the display unit 130 with the reference contrast value (S60), and adjusts the brightness of the image according to the difference between the contrast value and the reference contrast value of the display unit 130 (S70). ).

The brightness of the image may be automatically adjusted by the contrast comparison value measured by the controller 150, or may be arbitrarily adjusted by the observer.

When the contrast value of the display unit 130 matches the reference contrast value, the transmittance of the display unit 130 and the brightness of the image are maintained (S80).

Then, when the external brightness of the vehicle changes, the light sensor 160 for detecting the amount of light outside the vehicle detects the external light and transfers the input value to the controller 150 to perform the above steps sequentially to display the display unit ( Maintain contrast of 130) properly.

As described above, according to the transmissive display device and the control method thereof according to an embodiment of the present invention, by applying an ultraviolet light generating unit to expose ultraviolet light to the display unit to freely adjust the transmittance of the display unit, without being influenced by external light Contrast can be adjusted, which makes it possible to see both the information image and the background at the same time, and to detect the brightness of visible light coming from the outside by applying a light sensor to automatically adjust the UV irradiation amount and the image irradiation amount so that Contrast adjustment is possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

100: transmission display device 110: image generating unit
120: optical unit 130: display unit
132, 232: photochromic window 135: color filter layer
140: ultraviolet generation unit 150: control unit
160: light sensor 233: transparent window
234: photochromic filter layer 236: first color filter layer
237: second color filter layer

Claims (18)

An image generator for generating an image;
An optical unit which enlarges and transmits the image received from the image generator;
A display unit transmitting a real image and reflecting the image received from the optical unit to transmit a composite image to an observer;
An ultraviolet generator for irradiating ultraviolet rays to the display unit; And
And a control unit which controls the UV irradiation amount of the UV generating unit and the image brightness of the image generating unit in association with the amount of external light.
The display device according to claim 1,
A photochromic window having a characteristic of changing transmittance by ultraviolet rays; And
And a color discrimination filter layer provided in the photochromic window.
3. The method of claim 2,
The color screen filter layer is a transmissive display device, characterized in that attached to or coated in the form of a film on at least one of the one or the other surface of the photochromic window.
3. The method of claim 2,
The color-selection filter layer is a transmissive display device, characterized in that provided on the surface of the photochromic window closer to the viewer.
3. The method of claim 2,
The color-selection filter layer is a transmissive display device, characterized in that the transmittance of ultraviolet light is higher than the transmittance of visible light.
3. The method of claim 2,
Ultraviolet light emitted from the ultraviolet generating unit is incident on the surface of the photochromic window in close proximity to the observer, characterized in that the transparent display device.
3. The method of claim 2,
The photochromic window is a transmissive display device, characterized in that produced by applying a photochromic material (Photochromic Material).
3. The method of claim 2,
The photochromic window is a transparent window; And
And a photochromic filter layer attached or coated on at least one of one side or the other side of the transparent window in the form of a film.
The method of claim 8,
And wherein the photochromic filter layer is farther from the viewer than the color filter layer.
3. The method of claim 2,
The color-selective filter layer is a transmissive display device, characterized in that attached to or coated in the form of a film on the surface of the photochromic window far from the viewer to prevent the incident of the ultraviolet light into the photochromic window.
The method of claim 10,
The color-selective filter layer is a transmissive display device, characterized in that the transmittance of visible light is higher than the transmittance of ultraviolet light.
3. The method of claim 2,
The ultraviolet display of the ultraviolet generating unit is transmitted through the optical unit, characterized in that irradiated to the photochromic window.
3. The method of claim 2,
And the ultraviolet light generating unit is positioned such that ultraviolet light can project one or more of front, rear and all sides of the photochromic window.
14. The method according to any one of claims 1 to 13,
Transmissive display device comprising a light sensor for sensing the amount of light from the outside.
(a) inputting external brightness to the controller;
(b) comparing the input value of the external brightness with the reference value;
(c) adjusting the transmittance of the display unit by adjusting the amount of ultraviolet irradiation according to the difference between the input value and the reference value;
(d) irradiating an image to the display unit;
(e) comparing the contrast value of the display unit with a reference contrast value; And
(f) controlling the brightness of the image according to the difference between the contrast value and the reference contrast value of the display unit.
16. The method of claim 15,
In the step (c), if the input value is higher than the reference value, the ultraviolet irradiation unit irradiated by the ultraviolet generation unit is increased. Way.
16. The method of claim 15,
And when the contrast value of the display unit matches the reference value, maintaining the transmittance of the display unit and the brightness of the image.
16. The method of claim 15,
If the external brightness is changed after the step (f), the control of the transparent display device characterized in that the steps (a), (b), (c), (d), (e), (f) is sequentially performed Way.

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