KR20190041050A - Display apparatus using wave guide and image display method for the same - Google Patents

Abstract

The present invention relates to a display device using a wave guide and an image display method therefor, wherein the display device is made thin and light and makes it clearer to display a color image to enable a user to see a clear image. The present invention provides a display device using the wave guide, comprising a frame unit embedding part; a display unit coupled to the frame unit to enable the user to see the image; a control unit controlling the display unit; and a storage unit; and a storage unit storing a file, wherein the display unit comprises: an image outputting unit radiating image rays containing a plurality of colors for each pixel; a lens refracting the image rays to make the rays progress in a set direction; the wave guide totally reflecting the image rays passed through the lens to make the rays progress in a preset direction; and a holographic sheet diffracting the image rays near the wave guide to change the reflection angle. Therefore, the present invention is manufactured thinly, reduces weight to enhance the degree of freedom in design and minimizes any inconvenience of usage. In addition, the present invention prevents color spreading and provides clear images of full colors.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a display apparatus using a waveguide,

The present invention relates to a display device using a waveguide and a display method using the waveguide, and more particularly, to a display device using a waveguide for reducing a thickness and weight, To a video display method.

Augmented reality glasses, which show virtual images added to actual objects, are used in many fields such as defense, medical, and industrial, and are being researched and developed for use in various fields of software and hardware.

Such an augmented reality glass recognizes an actual object and gives information related to the recognized object or makes a virtual image of an object that does not actually exist, thereby matching the recognized object with the recognized object.

1, the augmented reality glass includes a liquid crystal display device 110, a first translucent mirror 130, a polarizing film 130_1, a second translucent mirror 140, and a concave mirror 150 .

An image is emitted by the liquid crystal display device 110, and the first translucent mirror uniformly reflects the light emitted from the liquid crystal display device. Also, the polarizing film 130_1 is attached to the back surface of the first semi-transparent mirror so that an image of the liquid crystal display device can be seen by the user's eyes.

The second translucent mirror 140 reflects the image of the liquid crystal display device transmitted through the first translucent mirror 130 and the polarizing film 130_1 at a predetermined angle. The concave mirror 150 enlarges and displays a liquid crystal display image displayed through the second translucent mirror 140 in the user's field of view.

However, such a display method of the augmented reality glass has a problem that the thickness becomes thick and the weight becomes large, and the design becomes complicated and the user becomes uncomfortable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device capable of reducing the weight and displaying a full-color clear image while reducing the thickness of the display device.

According to an aspect of the present invention, A display unit coupled to the frame unit and displaying an image on the user's eyes; A control unit for controlling the display unit; And a storage unit for storing the file,

The display unit includes:

A video transmitting unit emitting video light including a plurality of colors for each pixel; A lens for refracting the image light to proceed in a predetermined direction; A waveguide for totally reflecting the image light having passed through the lens and advancing in a predetermined direction; And a holographic sheet that changes a reflection angle of the image light adjacent to the waveguide.

The present invention also provides a frame structure, A display unit coupled to the frame unit and displaying an image on the user's eyes; A control unit for controlling the display unit; A method of displaying an image for a display device using a waveguide including a storage unit for storing a file,

In the video display method,

Searching a file stored in the storage unit by the control unit and reading color data for each pixel; Emitting image light including a plurality of colors for each pixel by the image sending unit based on the read information; Refracting the image light by a lens and advancing in a predetermined direction; Reflecting the image light having passed through the lens by a waveguide and proceeding in a predetermined direction; And diffracting the image light adjacent to the waveguide by a holographic sheet to change a reflection angle. The present invention also provides an image display method for a display device using a waveguide.

Preferably, the image transmitting unit radiates a wavelength corresponding to a plurality of colors to one pixel, and the control unit separates the color elements of each pixel to uniformly change the position of the color data.

Preferably, the control unit moves the color data for each pixel of the file stored in the storage unit to a pixel spaced uniformly for each color data by external input and stores the same.

According to the present invention, the thickness can be made thin, the weight can be reduced, the degree of freedom of design can be increased, and the user inconvenience can be minimized. In addition, there is an advantage in that color casting can be prevented and a full-color clear image can be provided.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a display principle of an augmented reality glass according to the prior art;
2 is an external view showing an appearance of an augmented reality glass according to the present invention;
3 is a view showing a configuration of a display unit of an augmented reality glass according to the present invention;
4 is a flowchart showing an image display method according to the present invention;
5 is an explanatory diagram showing RGB dispersion;
6A and 6B are diagrams for explaining a color data changing method by a file correction mode;

The configuration and operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, a display device using a waveguide according to the present invention comprises an augmented reality glass which is worn on a user's face so that a user can view a virtual image simultaneously with a real world, 300, a display unit 200, a control unit, and a storage unit.

3, the display unit 200 includes a video transmitting unit 210, a lens 220, a waveguide 230, and a holographic sheet 240.

The frame unit 300 may include a pair of eyeglasses legs that extend over the user's ears, and a display support disposed in front of the user's eyes to support the display unit. In addition, a camera for photographing the front may be disposed on the display support unit, and a battery, a control unit, a storage unit, various sensors, and the like may be provided in the eyeglass legs.

Preferably, the battery is provided as a rechargeable battery so that the battery can be charged. The sensor includes an object recognition sensor capable of recognizing an object ahead, an acceleration sensor capable of measuring movement of the augmented reality glass, And a gyro sensor having a gyro sensor.

The storage unit may be provided as an internal memory or an external memory, and image data to be displayed to the user is stored according to the situation. The image data may be stored in various file formats according to an encoding method, but the image data basically includes color data to be displayed for each pixel. The control unit decodes the encoded image data, reads color data to be displayed for each pixel, and controls the display unit to display a color corresponding to each pixel.

The image transmitting unit 210 included in the display unit 200 may include an LCD, an OLED, or the like, which is a thin film display device, and emits image light including a plurality of colors for each pixel.

Specifically, the image transmitting unit 210 is provided with three light sources R (red), G (green), and B (blue) in one pixel, and the control unit reads R , G, and B by adjusting the intensity of various colors.

The image light emitted from the image sending unit 210 enters the waveguide through the lens 220. The lens 220 refracts the image light so that it can be vertically incident inside the waveguide.

A first holographic sheet 242 is disposed on the opposite side of the lens 220 with the waveguide 230 therebetween. The image light incident perpendicularly to the waveguide changes in reflection angle by the first holographic sheet, is totally reflected in the waveguide, and travels along the waveguide. That is, the first holographic sheet 242 changes the reflection angle of the image light so that the total reflection can be performed inside the waveguide.

The image light is totally reflected by the first holographic sheet 242 and travels along the waveguide and the reflection angle is changed again by the second holographic sheet 244 so that the image light is out of the waveguide. At this time, the second holographic sheet 244 causes the image light to propagate vertically in the eye direction of the user.

The waveguide is preferably made of a transparent material so that the user can see an actual object in front of the waveguide. Since the waveguide can be made very thin, the overall design of the augmented reality glass can be produced very slimly.

On the other hand, if the waveguide is used, it is advantageous that the waveguide can be made thin. However, when the image light including a plurality of colors is propagated, the paths in the waveguide are changed according to the wavelengths of the respective colors. There is no such problem for one color, but this problem becomes conspicuous when displaying full color.

Specifically, referring to FIG. 5, the projected light emitted from one pixel is slightly changed in accordance with the wavelength of each color as it passes through the lens and the waveguide, so that RGB is not coincident and dispersed when viewed by the user's eyes . Therefore, the user may not be clear when viewing these images, and may even feel dizzy.

In the present invention, the augmented reality glass provides a file correction mode.

Specifically, in the file correction mode, the controller separates R, G, and B, and moves pixels only in selected colors.

For example, if the color data of each pixel is configured for each RGB as shown in FIG. 6A, the user can correct the R color and move the R color to the right pixel. At this time, the controller moves the R value of the color data as shown in FIG. 6A collectively to adjacent right pixels. The result is shown in Fig. 6B. The movement may be performed collectively, but may be performed for each row or column and for each individual pixel.

When the color data is changed, the control unit again displays the image based on the changed color data through the image sending unit. Therefore, the user can immediately check the image and select the optimum image.

In this way, the control unit can collectively move data of a specific color to another pixel according to a user's input, and such movement can be stopped by a user's input. When the movement is stopped, the control unit stores the color shift distance and the shifted color data of each of RGB in a storage unit, and the changed data can be encoded again based on the shifted color data and stored as a file. The color shift distance may indicate how many pixels are shifted in which direction of RGB, and may be referred to in other files.

As shown in FIG. 6B, the phenomenon of being dispersed and displayed for each of the RGB colors by the moved color data can be eliminated, and the user can see a clear image.

Next, an image display method for a display device using a waveguide according to the present invention will be described with reference to FIG.

First, in order to display a necessary image on the display unit, the control unit retrieves necessary files from the storage unit and reads color data for each pixel. If necessary, the control unit may perform a decoding process on the file. Also, the color data may include data for each of RGB.

The image transmitting unit radiates image light including a plurality of colors corresponding to each pixel based on the read color data. The image transmitting unit may use various types of thin film display devices such as an LCD and an OLED.

The image light is refracted by the lens and incident vertically into the waveguide. Also, the reflection angle of the image light incident on the waveguide is changed so that total reflection occurs by the first holographic sheet, and the image light propagates and propagates along the waveguide.

The second holographic sheet is provided at the end of the waveguide, and the image light traveling along the waveguide is reflected again by the second holographic sheet to exit the waveguide and is directed to the user's eyes.

The user confirms the image displayed by the display unit and determines whether or not the RGB is matched. Further, if it is determined that the RGB does not coincide, the file correction mode is started. The file correction mode may be provided as a separate button in the augmented reality glass or may be implemented in software.

When the file correction mode is activated, the control unit detects the stored color shift distance and changes the color data of the file using the color shift distance. Then, the image transmitting unit emits the image light again using the changed color data.

If the changed image is determined to be clear, the user presses the save button. When the save button is pressed, the control unit encodes the changed color data on the basis of the changed color data, and stores the changed file.

If it is determined that the changed image is not clear, the user can perform the color movement of each of RGB by the aforementioned method.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, and variations and modifications may be made without departing from the scope of the invention. It will be understood that the present invention can be changed.

210: a video transmitter 220: a lens
230: Waveguide

Claims (4)

A frame portion having a component therein;
A display unit coupled to the frame unit and displaying an image on the user's eyes;
A control unit for controlling the display unit;
And a storage unit for storing the file,
The display unit includes:
A video transmitting unit emitting video light including a plurality of colors for each pixel;
A lens for refracting the image light to proceed in a predetermined direction;
A waveguide for totally reflecting the image light having passed through the lens and advancing in a predetermined direction;
And a holographic sheet that changes the reflection angle of the image light adjacent to the waveguide.
A frame portion having a component therein;
A display unit coupled to the frame unit and displaying an image on the user's eyes;
A control unit for controlling the display unit;
A method of displaying an image for a display device using a waveguide including a storage unit for storing a file,
In the video display method,
Searching a file stored in the storage unit by the control unit and reading color data for each pixel;
Emitting image light including a plurality of colors for each pixel by the image sending unit based on the read information;
Refracting the image light by a lens and advancing in a predetermined direction;
Reflecting the image light having passed through the lens by a waveguide and proceeding in a predetermined direction;
And changing a reflection angle of the image light adjacent to the wave guide by a holographic sheet.
3. The method of claim 2,
Wherein the image transmitting unit radiates a wavelength corresponding to a plurality of colors in one pixel,
Wherein the control unit uniformly changes the display position of the color data of the pixel by separating the color data for each color.
The method of claim 3,
Wherein the control unit moves the color data for each pixel of the file stored in the storage unit to a pixel spaced uniformly at a uniform distance for each color data by external input and stores the image data for a display device using the waveguide Way.

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