KR20090066042A - Head mounted display terminal having a light shutter - Google Patents

Abstract

A head-mounted display terminal with a light shutter is provided to enable users to selectively adjust the amount of incident light when they desire to see images through the head-mounted display terminal. A head-mounted display terminal with a light shutter is composed of a display unit(150), a light shutter(160) and a controller. The display unit is integrated with the glasses of a goggle to display image signals. The light shutter is designed to block the one side of the display unit while adjusting the amount of incident light according to electrical states. The controller adjusts the amount of incident light thrown on the display unit and controls the amount of the light transmitted through the light shutter. The light shutter is contacted to the outer surface of the display unit in order to cover the display unit. The light shutter consists of a top and bottom electrode, a plurality of microcapsules and internal electrode.

Description

Head mounted display terminal having a light shutter}

The present invention relates to an information terminal, and more particularly to a head mounted display (HMD) terminal having a light shutter.

In general, a portable information terminal includes not only a mobile phone but also a mobile communication terminal such as a PDA (Personal Data Assistant) and a smart phone. Such a portable information terminal is an important advantage of its portability.

Therefore, a number of methods have emerged to increase the portability of such portable information terminals. As one of the methods for increasing the portability of such a portable information terminal, which is currently drawing attention is a method using a head mounted display (HMD). HMD generally refers to an image device that displays an image in front of a user in a virtual reality or augmented reality system, and has a form of a safety glasses or a helmet.

With this HMD, the user does not just control the computer through a two-dimensional screen such as a monitor and a flat input device such as a keyboard or a mouse, but directly selects a desired menu from a three-dimensional virtual reality screen. Control your computer by pointing or grabbing it with your hands.

To this end, the head mounted display terminal (hereinafter, abbreviated as "HMD terminal") includes a glass-type display unit equipped with an ultra-light micro display for displaying an image, an input device capable of detecting a user's movement, and such an input. It may be configured as a sensor for detecting a signal of the device to recognize the user's movement as a key.

The head mounted display device (HMD) allows the user to show the screen completely hidden in front of a person's eyes, so that they cannot recognize the external environment first, which is a safety concern. There was an aesthetic problem that looked silly on. To compensate for this and to enhance portability, a see-through type HMD terminal having a goggle shape and a light and thin display is being developed. The see-through type HMD terminal has a transparent goggle lens, so when the power is turned off, the outside is visible as if wearing sunglasses, and when the power is turned on to display an image signal (eg, a movie or TV screen), Since an image signal of a predetermined size is displayed, and the periphery of which the image signal is not displayed is a transparent lens, the peripheral field of view can be secured and safety problems are alleviated.

However, as the see-through type HMD terminal secures an ambient view, the image is blurred by external light. Therefore, in order to view a normal image, light that is incident on the display device must be completely blocked or high brightness must be implemented in the display device.

When the incident light is completely blocked, the see-through type is selected to have a perception of the external environment, but there is a contradiction that it must be completely blocked again from the external light in order to properly see the image. In addition, in the case of implementing high brightness, the problem of power consumption is large in the HMD emphasized portability, and the intensity of light entering the eye is increased, thereby causing eye health problems.

Accordingly, an object of the present invention in view of the above-described conventional problems is to provide a head mounted display terminal that can selectively adjust the amount of incident light when viewing an image through the head mounted display terminal.

A goggle-type head mounted display terminal according to a preferred embodiment of the present invention for achieving the above object, comprising: a display unit integrated with a glass of the goggles and displaying an image signal; An optical shutter unit installed to block one surface of the display unit and controlling an amount of light transmission according to an electrical state; And a control unit controlling an amount of light transmitted through the optical shutter unit to adjust an amount of light incident on the display unit.

The head mounted display terminal further includes an optical sensor unit configured to detect an amount of light incident on the optical shutter unit. When the optical sensor unit is further included, the controller may control the amount of light transmitted through the optical shutter unit to adjust the amount of light incident on the display unit according to the amount of light detected by the optical sensor unit.

Here, the optical shutter unit is installed in contact with the outer surface of the display unit to cover the display unit.

The optical shutter unit according to an embodiment, the upper and lower electrodes spaced apart from each other; A plurality of microcapsules formed between the upper and lower electrodes and sealing black ink particles and a transparent fluid therein; And an internal electrode formed on the lower electrode to distinguish each microcapsule. The optical shutter unit charges the upper, lower, and internal electrodes with an anode or a cathode to move the black ink fine particles by electric attraction or repulsion, thereby controlling the amount of light transmitted.

The optical shutter unit according to another embodiment is spaced apart from each other to face the upper and lower electrodes; And a plurality of microcapsules formed between the upper and lower electrodes and sealing the black ink fine particles aligned on the plate and the circular plate therein. The optical shutter unit controls the amount of light transmitted by charging the upper and lower electrodes with an anode or a cathode to move the black ink fine particles by electric attraction or repulsion.

According to another embodiment of the present invention, the optical shutter parts may include: upper and lower glass films spaced apart from each other; An ITO film formed in contact with the upper and lower glass films; A silicon oxide film formed internally in contact with the ITO film; A polyamide film inscribed in contact with the silicon oxide film; And it is characterized in that it comprises a cholesteric liquid crystal formed between the polyamide film. The optical shutter unit may apply a voltage to the cholesteric liquid crystal to adjust the amount of light transmitted according to the magnitude of the applied voltage.

According to the present invention, the optical shutter unit is attached to cover the entire surface of the display unit of the head mounted display terminal, and electrically controls the amount of light incident on the display unit through the optical shutter unit, and the image is stably maintained without interference of external light of the display unit. You can display the signal. Therefore, there is an advantage that the use of the head mounted display terminal can be increased.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

In addition, the present invention relates to a portable terminal having a head mounted display device (HMD), but may be applied to all portable terminals. For convenience of description, the mobile terminal will be described as an example of a mobile communication terminal for convenience. .

1 is a view showing a schematic configuration of a portable terminal according to an embodiment of the present invention.

Referring to FIG. 1, a portable terminal according to an exemplary embodiment of the present invention may include a wireless communication unit 110, an audio processor 120, an input unit 130, a memory unit 140, a display unit 150, and an optical shutter unit 160. ), The optical sensor unit 170 and the controller 180 is configured.

The wireless communication unit 110 transmits and receives a radio frequency (RF) signal with a base station through an antenna ANT. The wireless communication unit 110 converts the received signal into an intermediate frequency (IF) signal and outputs it to a control unit. Is converted into RF signal and transmitted.

The audio processor 120 includes a microphone MIC and a speaker, and the audio processor 120 includes a codec and an amplifier. The codec is PCM (Pulse Code Modulation) encoding the voice signal input from the microphone (MIC) to output the voice data to the controller 180 and PCM decoding the voice data input from the controller 180 ( Decoding) and outputs to the speaker (SPK) through the amplifier. The amplifier amplifies the voice signal input from the microphone MIK or the voice signal output from the speaker, and adjusts the volume of the speaker SPK and the gain of the microphone MIC under the control of the controller 180.

Input unit 130 is a device for input, unlike the keypad of a typical mobile terminal, such as power on / off or virtual screen on / off, some keys that the user can not execute by menu selection using the virtual screen through the HMD Only physically provided, other keys allow the user's motion to be detected and entered.

The memory unit 140 includes a read only memory (ROM), a random access memory (RAM), and a flash memory. The memory unit 140 stores an OS and an application required for driving the portable terminal, and user data generated when the portable terminal is used. Etc. It serves to store.

The display unit 150 includes a head mounted display (HMD), and includes a micro display in the HMD to display an image signal input under the control of the controller 180 as a stereoscopic screen (virtual screen) to the user. In order to supply such a screen signal, the display unit 150 may include an optical engine 151.

The optical shutter unit 160 is in an on state in which power is supplied or in an off state in which power is not supplied, under the control of the controller 180. In the on state, the light shutter unit 160 blocks the incident light to prevent light from entering the display unit. In the off state, the optical shutter unit 160 transmits light to allow light to enter the display unit. The operation of the optical shutter unit 160 will be described in more detail below.

The optical sensor unit 170 detects external light incident on the display unit of the portable terminal. The controller 180 detects an incident amount of external light through the optical sensor unit 170 and controls the optical shutter unit 160 accordingly. That is, the controller 180 controls the optical shutter unit 160 to be in an on state when the amount of incident light is greater than or equal to a preset threshold and in an off state when the amount of light is less than the threshold.

Herein, the controller 180 controls each part of the portable terminal. In addition, the controller 180 displays the image signal received through the wireless communication unit 110 and the image signal pre-stored in the storage unit through the display unit 140. Herein, the controller 180 controls the optical shutter unit 160 to adjust the amount of light transmitted to the display unit 150. At this time, the controller 180 detects an input signal of the user through the input unit, and controls the optical shutter unit 160 or controls the optical shutter unit 160 according to the incident amount detected by the optical sensor unit 170. can do.

The controller 180 is a function of a mobile communication terminal, and processes voice signals and data according to a protocol for a telephone call, data communication, and wireless Internet connection. To this end, the controller 180 is provided with a baseband processor, the baseband processor is a baseband analog ASIC (BBA) that provides an interface between the controller 180 and the wireless communication unit 210, the base applied from the controller 180 The digital signal of the band is converted into an analog IF signal and applied to the wireless communication unit 110, and the analog IF signal applied from the wireless communication unit 110 is converted into a digital signal of the baseband and applied to the controller 180.

In addition, although not shown, the portable terminal according to an embodiment of the present invention includes a storage medium inserting unit for inserting an external storage medium such as a memory card to store data, a connection terminal for exchanging data with an external digital device, and a charging unit. The terminal may be provided. In addition, the portable terminal may be configured to further include units having additional functions, such as a broadcast signal receiving module for receiving digital broadcast, an MP3 module for digital sound source reproduction.

According to the convergence trend of digital devices, the variations of mobile devices are very diverse and cannot be enumerated. However, a unit equivalent to the above-mentioned units may be further included in the mobile terminal according to the present invention. It can be easily understood by those skilled in the art.

2 is a view showing a state of the HMD terminal according to an embodiment of the present invention.

Referring to Figure 2 it can be seen that the embodiment of the present invention has a goggle (Goggle) form. Referring to the block diagram of the embodiment of the present invention shown in FIG. 1, the display unit 150 according to the embodiment of the present invention becomes a glass portion of FIG. 2. That is, the display unit 150 is integrated into the glass portion. The display unit 150 includes a micro display to display a screen. At this time, the display of the screen is displayed inward for the user to see.

In addition, as shown, the display unit 150 mounts the optical engine 151 on the frame of the goggles to produce an image signal, and transmits the image signal to a thin optical waveguide in the glass. In this case, it is preferable that the image signal uses any one of a diffractive optical element (DOE) technology and a hologram technology. The image signal is reflected or refracted in the glass to be recognized by the user. In addition, the optical shutter unit 160 is installed to contact the outer surface of the display unit 150 so as to cover the display unit 150. In addition, the optical sensor unit 170 may be installed anywhere in the frame portion of the glass, but is preferably installed at a position capable of detecting light incident to the optical shutter unit 160.

In addition, the wireless communication unit 110, the audio processing unit 120, the input unit 130, the memory unit 140, and the optical sensor unit 170 shown in FIG. 1 are formed on the rim portion of the glass in the embodiment of the present invention shown in FIG. Located.

At this time, the wireless communication unit 110, the audio processing unit 120, the input unit 130, the memory unit 140, the optical sensor unit 170 shown in FIG. And on the right hook, left rim, and left hook. For example, the controller 180 and the key input unit 130 may be embedded in the right hook portion, and the wireless communication unit 110 may be embedded in the right frame portion. In addition, the memory unit 140 may be built in the left hook portion, and the optical sensor unit 170 may be provided in the left frame portion.

However, of course, this position can be changed for convenience or other reasons. In addition, in the present invention, there is only one optical sensor unit 170, of course, may be provided with a plurality of optical sensor unit 170 to increase the accuracy of detecting the amount of light incident to the optical shutter unit. Therefore, the configuration according to the embodiment of the present invention is not limited by the embodiment shown in FIG.

The optical shutter unit 160 is turned on or off under the control of the controller 180. The operation of the optical shutter unit 160 will be described.

3A and 3B are diagrams for describing an operation of the optical shutter unit 160 according to an exemplary embodiment of the present invention. 3A and 3B show cross-sectional views of A-A 'of the mobile terminal shown in FIG. 3A is a diagram illustrating a case where the optical shutter unit 160 is turned off, and FIG. 3B is a diagram illustrating a case where the optical shutter unit 160 is turned on.

Referring to FIG. 3A, when the optical shutter unit 160 is turned off, light passes through the optical shutter unit 160 and the display unit 150 and enters the user's eyes. Accordingly, the user can see the scenery outside the display unit 150 and the optical shutter unit 160.

Referring to FIG. 3B, when the optical shutter unit 160 is turned on, light does not pass through the optical shutter unit 160. In this case, an image signal is input from the optical engine 151 to the display unit 150, and the user may see the image signal displayed on the display unit 150.

Next, the optical shutter unit 160 for executing the function as described above will be described. 4 is a diagram illustrating an example of an optical paper type shutter unit 160 according to an embodiment of the present invention.

As shown, the optical shutter unit 160 according to an embodiment of the present invention is a plurality of upper and lower electrodes 401 and 403 spaced apart from each other, and a plurality of formed between the upper and lower electrodes (401, 403) And an internal electrode 407 formed on the lower electrode 403 to distinguish the microcapsules 405 and each microcapsule 405. In addition, the microcapsules further include black ink particles 409 and transparent fluid 411 encapsulated in the inside.

Here, the upper and lower electrodes 401 and 403 are plate-shaped, the lower electrode 403 may be divided into a plurality. In addition, the lower electrodes 403 may be located in correspondence with the microcapsules 405 and the internal electrodes 407, respectively, or two may be located in correspondence with the microcapsules 405. In addition, the internal electrode 407 may be selectively formed and used as necessary.

The upper, lower, and inner electrodes 401, 403, and 409 are transparent electrodes free of light, and are charged to the positive electrode (+) or the negative electrode (−) under the control of the controller 180. Each microcapsule 405 represents one pixel, and each microcapsule 405 includes a plurality of black ink fine particles 409 and a transparent fluid 411. The black ink fine particles 409 are opaque and have a negative charge (−). In addition, the transparent fluid 411 is a fluid free of light transmission. The black ink fine particles 409 and the transparent fluid 411 have almost the same specific gravity so that their alignment is stably maintained when the positions thereof are aligned.

Therefore, the black ink fine particles 409 having negative charges (-) move by attraction or repulsive force depending on the state of charge of the electrodes 401, 403, 407.

Then, the operation of the optical shutter unit 160 according to an embodiment of the present invention will be described. 5A and 5B are diagrams for describing an operation of the optical shutter unit 160 described with reference to FIG. 4. Here, the lower electrode 403 is divided into a plurality of structures, each having a structure corresponding to the microcapsules 405 and the internal electrode 407.

An optical shutter unit 160 in an on state is illustrated in FIG. 5A. As shown, in the on state, the lower electrode 403 is charged with the positive electrode (+), and the upper electrode 401 is charged with the negative electrode (−). Then, since the black ink fine particles 409 inside the microcapsules 405 have a negative electrode (-), the black ink fine particles 409 are lowered in the microcapsules 405 by the electric attraction of the lower electrode 403. Attracted. As a result, the black ink fine particles 409 prevent transmission of incident light.

5B shows the optical shutter unit 160 in an off state. As shown, the lower electrode 403 disposed to correspond to the microcapsules 405 in the off state is charged to the negative electrode (-), and the internal electrodes 407 arranged on both sides of the microcapsules 405 are positive ( +) Is charged. As a result, a repulsion force is generated between the black ink fine particles 409 and the lower electrode 403, and an attractive force is generated between the internal electrode 407 and the black ink fine particles 409.

The black ink fine particles 409 are attracted in both directions in which the internal electrodes 407 are located by the attraction force and the repulsive force, so that the black ink fine particles 409 freely transmit the light between the upper electrode 401 and the lower electrode. Open the end of the microcapsules 405.

Next, the operation of the optical shutter unit 160 according to another embodiment of the present invention will be described. 6A and 6B are diagrams for describing an operation of the optical shutter unit 160 described with reference to FIG. 4. Here, the lower electrode 403 is divided into a plurality, and two lower electrodes are positioned corresponding to one microcapsule 405.

6A illustrates the optical shutter unit 160 in an on state. As described with reference to FIG. 5A, in the on state, the lower electrode 403 is charged with the positive electrode (+), and the upper electrode 401 is charged with the negative electrode (−). Then, since the black ink fine particles 409 inside the microcapsules 405 have a negative electrode (-), the black ink fine particles 409 are lowered in the microcapsules 405 by the electric attraction of the lower electrode 403. Attracted. As a result, the black ink fine particles 409 prevent transmission of incident light.

6B illustrates the optical shutter unit 160 in an off state. As shown, in the off state, the lower electrode 403 is charged alternately to the positive electrode (+) and the negative electrode (−) in two sets. The internal electrode 407 is charged with the same polarity as the lower electrode 403 located closest to it.

Then, the black ink fine particles 409 are attracted in both directions in which the internal electrode 407 charged to the positive electrode (+) is attracted by the attraction force and the repulsive force, so that the black ink fine particles 409 are connected to the upper electrode 401. The right or left side of the microcapsules 405 is opened to allow light to pass freely between the lower electrodes. This has the effect of opening a wider surface than the embodiment with reference to Figure 5b.

Next, the operation of the optical shutter unit 160 according to another embodiment of the present invention will be described. 7A and 7B are views for explaining the operation of the optical shutter unit according to the embodiment of the present invention. 7A and 7B is a form in which the internal electrode 407 is omitted from the optical shutter unit 160 described with reference to FIG. 4, and black ink fine particles 409 in the microcapsule 405. ) Is aligned to the circular plate 413.

7A illustrates the optical shutter unit 160 in an on state. As shown, in the on state, the upper and lower electrodes 401 and 403 are charged with a negative electrode (-). Then, since the black ink fine particles 409 in the microcapsules 405 have a negative electrode (-), they are arranged laterally by the repulsive force. As a result, the black ink fine particles 409 prevent transmission of incident light.

7B shows the optical shutter unit 160 in an off state. As shown, in the off state, the upper and lower electrodes 401 and 403 are charged to the positive electrode (+). Then, since the black ink fine particles 409 in the microcapsules 405 have a negative electrode (-), they are vertically arranged by attraction. As a result, the black ink fine particles 409 freely transmit the incident light.

In addition to the above-described embodiment, the optical shutter unit 160 according to the embodiment of the present invention may be formed using a cholesteric liquid crystal. 8 is a view for explaining an optical shutter unit 160 using a cholesteric liquid crystal according to an embodiment of the present invention.

Referring to FIG. 8, the optical shutter unit 160 according to the exemplary embodiment of the present invention may be formed by integrating the upper and lower glass layers 801 and the upper and lower glass layers 801 which are spaced apart from each other. A film 803, a silicon oxide (SiO 2) film 805 formed in an indirect contact with the ITO film 803, a polyimide film 807 formed by in contact with the silicon oxide film 805, and the poly The cholesteric liquid crystal 809 formed between the mid film 807 is comprised.

The cholesteric liquid crystals have reflectance changes with voltage, and remain transparent or translucent. Accordingly, the controller 180 may adjust the transparent or translucent state of the optical shutter unit 160 through a control signal (voltage magnitude).

In the above, examples of various optical shutter units 160 have been described. When the image signal is displayed on the display unit 150, the optical shutter unit 160 adjusts the amount of light transmitted from the outside to the display unit 150. Accordingly, the display unit 150 may display an image signal without interference of external light.

In addition, the optical shutter unit 160 may adjust the amount of light transmitted according to the user's input signal. In addition, the transmission amount control of the optical shutter unit 160 may be automatically adjusted according to the amount of light detected by the optical sensor unit 170. That is, the controller 180 detects the amount of light incident through the optical sensor unit 170, and controls the optical shutter unit 160 according to the amount of light, thereby controlling the amount of light passing through the optical shutter unit 160. You can adjust the amount.

As described above, in the detailed description of the present invention has been described with respect to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

1 is a view showing a schematic configuration of a portable terminal according to an embodiment of the present invention.

2 is a view showing a state of the HMD terminal according to an embodiment of the present invention.

3a and 3b are views for explaining the operation of the optical shutter unit according to an embodiment of the present invention.

4 is a view illustrating an example of an optical paper shutter unit of an electronic paper type according to an embodiment of the present invention.

5A and 5B are views for explaining the operation of the optical shutter unit described with reference to FIG.

6A and 6B are views for explaining the operation of the optical shutter unit described with reference to FIG.

7a and 7b are views for explaining the operation of the optical shutter unit according to an embodiment of the present invention.

8 is a view for explaining the optical shutter unit 160 using a cholesteric liquid crystal according to an embodiment of the present invention.

Claims (10)

In the goggle-type head mounted display terminal, A display unit integrated with the glass of the goggles and displaying an image signal; An optical shutter unit installed to block one surface of the display unit and controlling an amount of light transmission according to an electrical state; And And a controller configured to control the amount of light transmitted to the optical shutter unit to adjust the amount of light incident on the display unit. The method according to claim 1, The optical shutter unit A head-mounted display terminal, characterized in that it is installed in contact with the outer surface of the display portion to cover the display portion. The method according to claim 1, The optical shutter unit Upper and lower electrodes spaced apart from each other; A plurality of microcapsules formed between the upper and lower electrodes and sealing black ink particles and a transparent fluid therein; And And an internal electrode formed on a lower electrode so as to distinguish each of the microcapsules. The optical shutter unit The upper, lower and internal electrodes are charged with a positive electrode or a negative electrode to move the black ink fine particles by electric attraction or repulsive force to control the amount of light transmitted. The method according to claim 1, The optical shutter unit Upper and lower electrodes spaced apart from each other; And And a plurality of microcapsules formed between the upper and lower electrodes and sealing black ink fine particles arranged in the circular plate and the plate therein. The method according to claim 3, The optical shutter unit A charge-mounted display terminal according to claim 1, wherein the upper and lower electrodes are charged with a positive electrode or a negative electrode to move the black ink fine particles by electric attraction or repulsion to adjust the amount of light transmitted. The method according to claim 1, The optical shutter unit Upper and lower glass films spaced apart from each other; An ITO film formed in contact with the upper and lower glass films; A silicon oxide film formed internally in contact with the ITO film; A polyamide film inscribed in contact with the silicon oxide film; And A head mounted display terminal comprising a cholesteric liquid crystal formed between the polyamide film. The method according to claim 7, The optical shutter unit Voltage is applied to the cholesteric liquid crystal A head mounted display terminal, characterized in that for controlling the amount of light transmitted according to the magnitude of the applied voltage. The method according to claim 1, The head mounted display terminal further comprises an optical sensor unit for sensing an amount of light incident to the optical shutter unit. The method according to claim 9, The control unit The head mounted display terminal according to claim 1, wherein the amount of light transmitted through the optical shutter unit is controlled to adjust the amount of light incident on the display unit according to the amount of light sensed by the optical sensor unit.

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