KR20130085209A - Mobile terminal having partial 3d display - Google Patents

Abstract

PURPOSE: A mobile terminal equipping a partial three-dimensional display device is provided to increase the brightness of a three-dimensional display area. CONSTITUTION: A display panel (210) receives a light emitted from a backlight. The display panel equips a two-dimensional display area and a three-dimensional display area. A barrier (230) is installed to face the three-dimensional display area. The barrier generates a three-dimensional image by blocking the light emitted from the backlight. A diffusion sheet (220) is arranged between the barrier and the display panel.

Description

Mobile terminal with partial 3D display {MOBILE TERMINAL HAVING PARTIAL 3D DISPLAY}

The present invention relates to a mobile terminal having a partial three-dimensional display.

Recently, as various functions for user convenience and entertainment have been added to mobile terminals such as personal computers, laptops, mobile phones, and the like, mobile terminals employing three-dimensional displays have emerged.

The three-dimensional display employed in such mobile terminals allows the user to enjoy clearer and more realistic video information, and for the sake of practicality, usability, and cost, the entire display is not partially applied to the three-dimensional display. In other words, only a part of the display is applied in three dimensions and the other part is often applied in two dimensions.

Accordingly, quality improvement such as luminance of such a partial three-dimensional display has become an important issue.

An object of the present invention is to provide a mobile terminal having a partial three-dimensional display that can improve the brightness of the three-dimensional display area in the partial three-dimensional display applied to the mobile terminal.

A mobile terminal having a partial three-dimensional display according to an embodiment of the present invention for realizing the above object is a backlight; A display panel to which light emitted from the backlight is incident and having a 2D image display area and a 3D image display area; A barrier disposed to face the three-dimensional image display area to block light emitted from the backlight to generate a three-dimensional image; And a diffusion sheet disposed between the barrier and the display panel.

On the other hand, the diffusion sheet may be installed to include the whole facing the two-dimensional image display area and the three-dimensional image display area of the display panel.

In addition, the diffusion sheet may include light scattering particles for diffusing the incident light.

The diffusion sheet may include a resin and inorganic particles having a refractive index of 1.6 or more.

According to the mobile terminal having the partial three-dimensional display according to the present invention, the luminance can be improved simply, economically and efficiently in the three-dimensional image display area.

In addition, as the luminance of the 3D image display area is improved, the overall display quality may be uniform.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.
2 is a diagram schematically illustrating a display module of a mobile terminal according to an embodiment of the present invention.
3 is a view for explaining the operation of the partial three-dimensional display module according to an embodiment of the present invention.
4 is a view for explaining a cross section of the diffusion sheet of FIG.
5 is a view for explaining another cross section of the diffusion sheet of FIG.

The above objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. It is to be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. Like reference numerals designate like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In addition, the numbers (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

Hereinafter, a mobile terminal to which the present invention is applied will be described in more detail with reference to the accompanying drawings. The present invention mainly describes a case where it is applied to a mobile terminal by way of example, but the present invention is not limited thereto, and may be applied to a case where a secure communication is required for specific information while using a non-secure communication protocol in various terminals.

The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

The mobile terminal described in this specification may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), and navigation. However, it will be readily apparent to those skilled in the art that the configuration according to the embodiments described herein may also be applied to fixed terminals such as digital TVs, desktop computers, etc., except when applicable only to mobile terminals.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

The mobile terminal 100 includes a wireless communication unit 110, an audio / video input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory unit 160, An interface unit 170, a control unit 180, a power supply unit 190, and the like. The components shown in Fig. 1 are not essential, and a mobile terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

The wireless communication unit 110 may include one or more modules for enabling wireless communication between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and the network in which the mobile terminal 100 is located. For example, the wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short range communication module 114, and a location information module 115 .

The broadcast receiving module 111 receives a broadcast signal and / or broadcast related information from an external broadcast management server through a broadcast channel.

The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 112.

The broadcast related information may exist in various forms. For example, an EPG (Electronic Program Guide) of a DMB (Digital Multimedia Broadcasting) or an ESG (Electronic Service Guide) of a DVBH (Digital Video BroadcastHandheld).

The broadcast receiving module 111 receives broadcast signals using various broadcasting systems. In particular, the broadcast receiving module 111 may be a digital multimedia broadcasting broadcasting (DMBT), a digital multimedia broadcasting satellite (DMBS), a media forward link only (MediaFLO), a digital video broadcasting ), And ISDBT (Integrated Services Digital Broadcast Terrestrial). Of course, the broadcast receiving module 111 may be adapted to other broadcasting systems that provide broadcast signals as well as the digital broadcasting system described above.

The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory unit 160.

The mobile communication module 112 transmits and receives radio signals to at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 113 refers to a module for wireless Internet access, and the wireless Internet module 113 can be embedded in the mobile terminal 100 or externally. WLAN (WiFi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies.

The short range communication module 114 refers to a module for short range communication. Bluetooth, radio frequency identification (RFID), infrared data association (IrDA), ultra wideband (UWB), ZigBee, and the like can be used as the short distance communication technology.

The location information module 115 is a module for confirming or obtaining the location of the mobile terminal. A typical example of the location information module is a GPS (Global Position System) module. According to the current technology, the GPS module 115 calculates information on a distance (distance) from three or more satellites to one point (entity), information on the time when the distance information is measured, , Three-dimensional position information according to latitude, longitude, and altitude of one point (individual) in one hour can be calculated. Further, a method of calculating position and time information using three satellites and correcting the error of the calculated position and time information using another satellite is also used. The GPS module 115 continues to calculate the current position in real time and uses it to calculate speed information.

Referring to FIG. 1, an A / V (Audio / Video) input unit 120 is for inputting an audio signal or a video signal, and may include a camera 121 and a microphone 122. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video call mode or the photographing mode. The processed image frame can be displayed on the display module 151. [

The image frame processed by the camera 121 may be stored in the memory unit 160 or may be transmitted to the outside through the wireless communication unit 110. [ The camera 121 may be equipped with two or more cameras according to the configuration of the terminal.

The microphone 122 receives an external sound signal through a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 112 when the voice data is in the call mode, and output. Various noise reduction algorithms may be implemented in the microphone 122 to remove noise generated in receiving an external sound signal.

The user input unit 130 generates input data for a user to control the operation of the terminal. The user input unit 130 may include a key pad dome switch, a touch pad (static pressure / capacitance), a jog wheel, a jog switch, and the like.

The sensing unit 140 senses the current state of the mobile terminal 100 such as the open / close state of the mobile terminal 100, the position of the mobile terminal 100, the presence or absence of user contact, the orientation of the mobile terminal, And generates a sensing signal for controlling the operation of the mobile terminal 100. For example, when the mobile terminal 100 is in the form of a slide phone, it may sense whether the slide phone is opened or closed. In addition, it may be responsible for a sensing function related to whether the power supply unit 190 is powered on, whether the interface unit 170 is connected to an external device, and the like. Meanwhile, the sensing unit 140 may include an attitude sensor 141 and / or a proximity sensor.

The output unit 150 is for generating output related to visual, auditory or tactile sense and includes a display module 151, an acoustic output module 152, an alarm unit 153, and a haptic module 154 .

The display module 151 displays and outputs information processed by the mobile terminal 100. For example, when the mobile terminal is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with a call is displayed. When the mobile terminal 100 is in the video communication mode or the photographing mode, the photographed and / or received video or UI and GUI are displayed.

The display module 151 is selected from a liquid crystal display, a thin film transistor liquid crystal display, an organic light emitting diode, a flexible display, and a 3D display. It may include at least one.

Some of these displays may be transparent or light transmissive so that they can be seen through. This may be referred to as a transparent display. A typical example of the transparent display is a transparent LCD or the like. The rear structure of the display module 151 may also be of a light transmission type. With this structure, the user can see the object located behind the terminal body through the area occupied by the display module 151 of the terminal body.

There may be two or more display modules 151 according to the implementation form of the mobile terminal 100. For example, in the mobile terminal 100, a plurality of display modules may be spaced apart or integrally arranged on one surface, and may be disposed on different surfaces, respectively.

When the display module 151 and a sensor for detecting a touch motion (hereinafter, referred to as a touch sensor) form a mutual layer structure (hereinafter, abbreviated as “touch screen”), the display module 151 may output an output device. It can also be used as an input device. The touch sensor may have the form of, for example, a touch film, a touch sheet, a touch pad, or the like.

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display module 151 or a capacitance generated in a specific portion of the display module 151 into an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. Thus, the control unit 180 can know which area of the display module 151 is touched or the like.

Referring to FIG. 1, a proximity sensor may be disposed in an inner region of the mobile terminal or in the vicinity of the touch screen, which is enclosed by the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

Examples of the proximity sensor include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor.

And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of explanation, the act of allowing the pointer to be recognized without being in contact with the touch screen so that the pointer is located on the touch screen is referred to as a "proximity touch", and the touch The act of actually touching the pointer on the screen is called "contact touch." The position where the pointer is proximately touched on the touch screen means a position where the pointer is vertically corresponding to the touch screen when the pointer is touched.

The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected proximity touch operation and the proximity touch pattern may be output on the touch screen.

The audio output module 152 may output audio data received from the wireless communication unit 110 or stored in the memory unit 160 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output module 152 outputs an acoustic signal related to a function (e.g., a call signal reception sound, a message reception sound, etc.) performed in the mobile terminal 100. The audio output module 152 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 153 outputs a signal for notifying the occurrence of an event of the mobile terminal 100. Examples of events that occur in the mobile terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 153 may output a signal for notifying the occurrence of an event in a form other than the video signal or the audio signal, for example, vibration. The video signal or audio signal may also be output through the display module 151 or the audio output module 152.

The haptic module 154 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 154 is vibration. The intensity and pattern of vibration generated by the haptic module 154 can be controlled. For example, different vibrations may be synthesized and output or sequentially output.

In addition to the vibration, the haptic module 154 may be configured to perform various functions such as an effect of stimulation by a pin arrangement vertically moving with respect to a contact skin surface, an effect of stimulation by air spraying force or suction force through a jet opening or a suction opening, A variety of tactile effects such as an effect of stimulation through contact of an electrode, an effect of stimulation by an electrostatic force, and an effect of reproducing a cold sensation using a heat absorbing or exothermic element can be generated.

The haptic module 154 can be implemented not only to transmit the tactile effect through the direct contact but also to feel the tactile effect through the muscles of the user's finger or arm. The haptic module 154 may include two or more haptic modules 154 according to the configuration of the portable terminal 100.

The memory unit 160 may store a program for the operation of the controller 180 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory unit 160 may store data related to vibration and sound of various patterns outputted when a touch is input on the touch screen.

The memory unit 160 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) At least one of a random access memory (RAM), a static random access memory (SRAM), a read only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read- Lt; / RTI > type of storage medium. The mobile terminal 100 may operate in association with a web storage that performs a storage function of the memory unit 160 on the Internet.

The interface unit 170 serves as a path for communication with all external devices connected to the mobile terminal 100. The interface unit 170 receives data from an external device or receives power from the external device to transfer the data to each component in the mobile terminal 100 or to transmit data in the mobile terminal 100 to an external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 170.

The identification module is a chip for storing various information for authenticating the use right of the mobile terminal 100 and includes a user identification module (UIM), a subscriber identity module (SIM), a general user authentication module A Universal Subscriber Identity Module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the port.

When the mobile terminal 100 is connected to an external cradle, the interface unit may be a path through which power from the cradle is supplied to the mobile terminal 100, or various command signals input by the user to the cradle may be transmitted It can be a passage to be transmitted to the terminal. Various command signals or power input from the cradle may be operated as signals for recognizing that the mobile terminal is correctly mounted on the cradle.

The control unit 180 typically controls the overall operation of the mobile terminal. For example, voice communication, data communication, video communication, and the like. The control unit 180 may include a multimedia module 181 for multimedia playback. The multimedia module 181 may be implemented in the control unit 180 or may be implemented separately from the control unit 180. [

The controller 180 may perform a pattern recognition process for recognizing handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The power supply unit 190 receives an external power source and an internal power source under the control of the controller 180 to supply power for operation of each component.

The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to a hardware implementation, the embodiments described herein may be implemented as application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays May be implemented using at least one of processors, controllers, microcontrollers, microprocessors, and electrical units for performing functions. In some cases such embodiments may be implemented using a controller 180 < / RTI >

According to a software implementation, embodiments such as procedures or functions may be implemented with separate software modules that perform at least one function or operation. The software code may be implemented by a software application written in a suitable programming language. Also, the software codes may be stored in the memory unit 160 and executed by the control unit 180. [

FIG. 2 is a diagram for describing the structure of the display module of FIG. 1.

According to an embodiment of the present invention, the display module 151 is implemented as a partial three-dimensional display capable of realizing two-dimensional and three-dimensional images for each region.

Accordingly, the area B in which the two-dimensional image is implemented and the area A in which the three-dimensional image is implemented are distinguished and configured, and these two areas are alternately arranged as necessary, or the two and three-dimensional areas are arranged separately from the outside and the inside. Alternatively, the two-dimensional and three-dimensional regions may be arranged separately, vertically or horizontally. Meanwhile, the region in which the 3D image and the 2D image are implemented may not be fixed and may be designed to be variable depending on a situation.

Accordingly, the display module 151 includes a display panel 210 divided into regions for implementing two-dimensional and three-dimensional images, a backlight 240 for irradiating light toward the display panel 210, and the display panel ( The barrier 230 and the barrier 230 and the display, which are disposed between the 3D image realization area of the 210 and the backlight 240 to implement a 3D image by partially blocking the light emitted from the backlight 240. The diffusion sheet 220 is disposed between the panels 210.

Meanwhile, holographic or stereoscopy methods have been widely studied for 3D displays.

Although the holographic method is an ideal display method, it requires a coherent light source and it is difficult to record and play back a large object located at a long distance.

On the other hand, stereoscopic method causes two-dimensional image with binocular disparity and shows three-dimensional effect by showing them separately on both eyes of human. This method uses two planar images, making it simple to implement and displaying three-dimensional images with high resolution and great depth.

On the other hand, the stereoscopic method is also a means for viewing a separate image from both eyes, depending on the realization method, to display the polarization of the left and right parallax image on the direct-view display element or the projector in a qkRN method or time division method, and polarized glasses or liquid crystal There is an eyeglass type using shutter glasses and an autostereoscopy that separates an image directly from a display to form a viewing area.

The non-glass type stereoscopic image display method has a disadvantage in that the observation range is fixed and is limited to a small number of people, but there is no inconvenience in having to wear separate glasses.

A parallax barrier method or a lenticular method is employed to implement such a non-glasses stereoscopic image display method.

Barrier modalities can easily implement 3D images from a technical point of view, and can reduce costs compared to lenticular methods.

According to the parallax barrier method, a stereo image passing through the slit is formed by placing a slit in the vertical or horizontal form in front of the right eye image and the left eye image corresponding to the left and right eyes.

3 is a diagram illustrating a parallax barrier 230 for implementing a 3D image. Referring to FIG. 3, the parallax barrier 230 divides a left eye image and a right eye image by selectively blocking light emitted from the backlight 240 using a barrier to implement a 3D stereoscopic image.

A 3D stereoscopic image implementation method using a parallax barrier method is as follows.

First, among the light emitted from the backlight 240, the light toward the viewer's left eye passes through the left eye pixel L of the display panel 210 and passes through the slit of the parallax barrier 230. It becomes the light reaching the left eye. However, even though the light emitted from the backlight 240 passes through the left eye pixel L of the display panel 210, the light directed to the viewer's right eye is blocked by the barrier 230 and is not transmitted to the viewer.

That is, among the light emitted from the backlight 240, there is light R1 that passes through the right eye pixel R of the observer and passes through the slit of the parallax barrier 230 to reach the observer's right eye. Even though the right eye pixel R of 210 passes through the right eye pixel R, light toward the observer's left eye is blocked by the barrier 230.

Therefore, the light passing through the left eye pixel L becomes the light transmitted only to the left eye of the observer, and the light passing through the right eye pixel R becomes the light transmitted only to the right eye of the observer so that the viewer can recognize the light.

At this time, the parallax information is formed between the light reaching the left eye and the light reaching the right eye so that the human being as an observer can fully sense, thereby allowing the observer to appreciate the 3D stereoscopic image.

However, in this process, since the light transmitted without being blocked by the parallax barrier 230 is less than about 50% of incident light, there are many disadvantages in luminance loss.

Referring back to FIG. 2, the partial 3D display module 151 according to the present invention includes a display panel 210, a diffusion sheet 220, a barrier 230, and a backlight 240.

The display panel 210 includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting diode (OLED), OLED) such as a flat panel display device. In the exemplary embodiment of the present invention, the liquid crystal display device is illustrated, but the present invention is not limited thereto.

The diffusion sheet 220 is disposed between the display panel 210 and the barrier 230. The diffusion sheet 220 is mainly made of polyester, polycarbonate, or the like, and various structures may be applied to diffuse the light of the 2D display area into the 3D display area.

Diffusion sheet to be described below is for convenience of description and the present invention is not limited to this, any known diffusion sheet can be used.

4 is a view showing an example of a diffusion sheet according to the present invention.

The diffusion sheet 220 may be implemented in a structure in which the light scattering particles 223 are included in the diffusion layer 221.

In this case, the diffusion layer 221 has a flat plate shape and diffuses light incident from the backlight 240 isotropically through internal light scattering.

The diffusion layer 221 is opaque including a resin of transparent material and light scattering particles 223 having a difference in refractive index between the resin and 0.02 to 0.1 or less.

It is preferable that resin of transparent material is resin which mixed polyester, polyvinyl chloride, polycarbonate, polymethyl methacrylate, polystyrene, polyester sulfone, polybutadiene, polyether ketone, polyurethane, etc. individually or in combination of 2 or more types. .

The light scattering particles 223 are preferably in the form of a polymer organic material alone or a mixture such as polyethyl methacrylate, polystyrene and polybutadiene, or an inorganic material such as silica. For example, the light scattering particles 223 may be prepared by using polymethylmethacrylate, polystyrene, polybutadiene, and silica, respectively, or the light scattering particles 223 may be mixed by mixing silica with one of polymethylmethacrylate, polystyrene, and polybutadiene. ), Or in the form of a copolymer using at least two selected from polymethylmethacrylate, polystyrene and polybutadiene, or may be prepared by including silica in such a copolymer.

The light scattering particles 223 may be elliptical, near spherical or amorphous particles.

The diffusion sheet 220 having such a structure first prepares a resin including the light scattering particles 223 and then manufactures an isotropic diffusion layer 221 by a method such as extrusion or casting using a flat mold (not shown). .

In the diffusion sheet 220 manufactured as described above, after the light emitted from the backlight 240 is incident on the diffusion layer 221, the emission angle of the diffusion sheet 220 is changed according to the incident angle.

The diffusion sheet 220 may be implemented as a dual structure of the isotropic diffusion layer 221 and the reflector 222.

In this case, the diffusion layer 221 has a flat plate shape and diffuses light incident from the backlight 240 isotropically through internal light scattering.

In addition, each of the reflectors 222 has a triangular cross-sectional shape and is configured in the form of a plurality of cones or polygonal pyramids arranged on the isotropic diffusion layer 221 spaced apart from each other to reflect the light diffused by the diffusion layer 221.

The diffusion layer 221 is opaque, including a transparent resin and light scattering particles having a refractive index difference of 0.02 to 0.1 or less.

It is preferable that resin of transparent material is resin which mixed polyester, polyvinyl chloride, polycarbonate, polymethyl methacrylate, polystyrene, polyester sulfone, polybutadiene, polyether ketone, polyurethane, etc. individually or in combination of 2 or more types. .

The light-scattering particles are preferably high molecular organic materials such as polyethyl methacrylate, polystyrene and polybutadiene, or in the form of a mixture or inorganic materials such as silica. For example, light-scattering particles are prepared solely with polymethylmethacrylate, polystyrene, polybutadiene, and silica, or light-scattering particles are prepared by mixing silica with one of polymethylmethacrylate, polystyrene, and polybutadiene, or poly It may be prepared in the form of a copolymer using two or more selected from methyl methacrylate, polystyrene, and polybutadiene, or prepared by embedding silica in such a copolymer.

By employing the diffusion sheet 2220 configured as described above, the light incident on the diffusion sheet 220 facing the two-dimensional image realization area B of the display module 151 among the light emitted from the backlight 240 depends on the incident angle. Since part of the light diffused isotropically and incident on the 2D image realization area is directed toward the 3D image realization area A, the luminance of the 3D image realization area A is improved.

5 is a view for explaining another embodiment of the diffusion sheet of FIG.

Referring to FIG. 5, the diffusion sheet 220 is manufactured to include the light scattering particles 223 only in a portion facing the two-dimensional image display area of FIG. 2.

The diffusion sheet 220 having such a structure may be applied when the 3D image display area and the 2D image display area are fixed and not changed.

Accordingly, the light incident on the diffusion sheet 220 in the portion facing the 2D image display area is isotropically diffused and emitted to the portion facing the 3D image display area.

However, since the light incident on the diffusion sheet 220 of the portion facing the 3D image display area is not diffused, the luminance of the 3D image display area may be further improved.

In addition, the diffusion sheet 220 of the portion facing the 3D image display area may be made of a material including resin and inorganic particles to improve the linearity of light, thereby further improving the brightness of the 3D image display area.

It is preferable that resin is resin which mixed urethane acrylate, epoxy acrylate, ester acrylate, ether acrylate, ether acrylate, a radical generating monomer, etc. individually or in 2 or more types.

The inorganic particles are preferably any one of TiO ₂ , BaSO ₄ , Al (OH) ₃ , Al ₂ O ₃ , CaCo ₃ , ZnO, and ZnS having a refractive index of 1.6 or more. Instead of the inorganic particles, metal particles such as silver and aluminum may be used.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: mobile terminal 110: wireless communication unit
140: sensing unit 151: display module
180:

Claims (4)

Backlight;
A display panel to which light emitted from the backlight is incident and having a 2D image display area and a 3D image display area;
A barrier disposed to face the three-dimensional image display area to block light emitted from the backlight to generate a three-dimensional image; And
And a diffusion sheet disposed between the barrier and the display panel.
The method according to claim 1,
The diffusion sheet is installed so as to include the whole facing the two-dimensional image display area and the three-dimensional image display area of the display panel.
The method according to claim 1,
The diffusion sheet is a mobile terminal, characterized in that it comprises light scattering particles for diffusing the incident light.
The method of claim 3,
The diffusion sheet comprises a resin and inorganic particles having a refractive index of 1.6 or more.

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