KR100810260B1 - Portable terminal with projector - Google Patents

Abstract

A portable terminal containing a projector is provided to effectively disperse the heat generated from a projector by adopting a heat spreading structure using thermal-conductive films. A portable terminal comprises a projector(200) and a control part(140). The projector(200) projects images in a line scan method, and the control part(140) provides image data to the projector(200). Also the portable terminal comprises a scaler(160) and a display part(150). The scaler(160) converts low-resolution image data, inputted from the control part(140), into high-resolution image data and outputs the converted image data to the projector(200). The display part(150) displays images on the screen according to the image data inputted from the control part(140). The control part(140) selectively operates either the projector(200) or the display part(150). In addition, the portable terminal comprises a switch to selectively output the inputted image data to either the projector(200) or the display part(150).

Description

PORTABLE TERMINAL WITH PROJECTOR

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

2 is a diagram illustrating a detailed configuration of a projector shown in FIG. 1;

3 is a view showing a detailed configuration of an optical system shown in FIG.

4 is a perspective view showing the illumination lens system shown in FIG.

5A and 5B are diagrams showing one configuration example of a scanner;

6A to 6D are views showing another example of the configuration of a scanner,

7 shows an example of the configuration of the green light source of FIG.

8 is a diagram illustrating a detailed circuit configuration of the SOM controller shown in FIG. 2;

9 is a timing diagram for driving a projector;

10 is a diagram for explaining a heat diffusion structure of a projector module.

The present invention relates to a portable terminal, and more particularly to a portable terminal having a projector.

Portable terminals are developing in various directions through the convergence of various functions and services. Functions such as digital camera, MP3, DMB, PC, and health care have already been applied to portable terminals. In addition, Bluetooth, UWB improves the connectivity between mobile devices, PCs, and home appliances. (ultra wideband), WiBro and other technologies are booming and the multimedia related content market is waiting for maturity.

However, portable terminals based on 2 to 3 inches, which are typical sizes, have limited utilization due to a narrow screen size, and have a limited range of applicable contents.

In order to solve this problem, the front touch panel method has been known, but since the screen size is about 3.5 to 4 inches, the situation is inevitable.

Accordingly, there is a need for a portable terminal having a projector that allows a user to enlarge and view a content that several people want to share, such as a video, a still image, an e-book, etc. in a size of 10 to 40 inches.

The present invention has been made to solve the above-mentioned conventional problems, according to an aspect of the present invention is provided with a portable terminal having a built-in projector.

A portable terminal according to an aspect of the present invention, the projector for projecting an image by a line scan method; And a controller for providing image data to the projector.

Preferably, the projector comprises a plurality of light sources for generating lights of different colors; A spatial light modulator for line modulating and outputting the light; It includes a scanner for projecting the light incident from the spatial light modulator in a line scan method.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention; In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

1 is a diagram showing the circuit configuration of a portable terminal according to an embodiment of the present invention. The portable terminal 100 includes an RF unit 110, a camera 130, a TV tuner 120, a keypad 172, a speaker 176, a controller 140, a switch (SW, 178). ), A memory 174, a display unit 150, a scaler 160, and a projector 200.

The RF unit 110 receives an RF signal from the air by using an antenna and outputs image and audio data obtained by demodulating the RF signal to the control unit 140. In addition, the RF unit 110 modulates the image and audio data input from the control unit 140 to generate an RF signal, and wirelessly transmits the generated RF signal to the air using an antenna. Such modulation and demodulation may be preferably performed according to a code division multiple access (CDMA) scheme, in addition to a frequency division multiplexing (FDM) scheme, a time division multiplexing (TDM) scheme. It may be carried out in a manner such as.

The TV tuner 120 receives a broadcast signal from the air by using an antenna and outputs video and audio data obtained by demodulating the broadcast signal to the controller 140. The TV tuner 120 may use a conventional terrestrial digital multimedia broadcasting (DMB) module or a satellite DMB module.

The camera 130 outputs image data obtained by photographing a subject to the controller 140. The camera 130 provides an image sensor for detecting an image of a subject as electrical image data, an optical system for generating an image of the subject, and a voltage required for the image sensor. It may include a driving circuit for, and a conventional complementary metal oxide semiconductor (CMOS) image sensor may be used as the image sensor.

The keypad 172 provides keys for inputting numeric and text information and function keys for setting various functions, and outputs a key signal generated by a user to the controller 140.

The memory 174 is a program for displaying the image data input to the controller 140 using the display unit 150 or the projector 200, an image (menu screen, Standby screen, etc.) or a program can be stored.

The controller 140 performs arithmetic processing such as codec decoding on the voice data input from the RF unit 110 or the TV tuner 120, and transmits the arithmetic processed voice data to the speaker 176. Output In addition, the controller 140 performs arithmetic processing such as codec decoding on image data input from the RF unit 110, the TV tuner 120, or the camera 130, and outputs the computed image data to the display unit ( 150) or output to the scaler 160. The controller 140 may use each of a mobile station modem (MSM) serving as a communication modem or a communication processor, a digital signal processor (DSP) (or an application processor (AP)) serving as a multimedia processor, or a combination thereof. have. The image data output from the controller 140 may be divided into red image data, green image data, and blue image data as digital image data, and the image data of each color may include 8 bits.

The speaker 176 converts the voice data input from the controller 140 into sound waves and outputs the sound waves.

The switch 178 selectively outputs image data input from the control unit 140 to the display unit 150 or the scaler 160 under the control of the control unit 140.

In the present embodiment, in order to reduce power consumption, the controller 140 selectively outputs image data by using the switch 178, but the same image data is applied to both the display unit 150 and the scaler 160. May be adopted, and a method of powering off either of them may be adopted. In this case, the switch 178 is removed in FIG. 1, and the display unit 150 and the scaler 160 are commonly connected to the control unit 140 in parallel.

The display unit 150 displays an image according to the image data input from the controller 140 on the screen. As the display unit 150, a conventional liquid crystal display including a liquid crystal unit and a backlight unit for irradiating light to the liquid crystal unit may be used.

Due to the limitation of the transmission capacity, the image data output from the controller 140 may have a QVGA resolution as in a typical portable terminal.

The scaler 160 converts image data of a low resolution (eg, QVGA) input from the controller 140 into image data of a high resolution (eg, VGA) and performs color correction according to a change in resolution. That is, the scaler 160 increases each pixel of the input image data to a plurality of pixels (in other words, increases the resolution), and matches the color of each added pixel to the color of an existing existing pixel (eg, , As the middle color of the colors of two adjacent existing pixels). The scaler 160 may be built in the controller 140 or may not be used when the image data output from the controller 140 has a high resolution.

The projector 200 projects an image according to the image data input from the scaler 178 on the screen.

2 is a diagram illustrating a detailed configuration of the projector 200.

The projector 200 includes a spatial optical modulator (SOM) controller 300, a driver 400, and an optical system 500.

The SOM controller 300 calculates and processes the image data input from the scaler 160 in a form capable of RGB scan sequential line scan timing for the spatial light modulator, and transmits the processed image data to the spatial light modulator. Output That is, assuming that the resolution of the projection image is M * N (M pixel rows and N pixel columns), for example, the SOM controller 300 may generate red, green, and blue image data of the p-th pixel column. P repeats the process of outputting sequentially from 1 to N. In addition, the SOM controller 300 provides a synchronization signal to the driver 400 so that the red, green, and blue light sources, the scanner, and the spatial light modulator can be driven in synchronization.

Referring to FIG. 8, the driver 400 may include a light source driver 410 for outputting a driving signal for driving red, green, and blue light sources according to a synchronization signal input from the SOM controller 300, and the SOM controller. The scanner driver 420 outputs a driving signal for driving the scanner according to the synchronization signal input from the 300. Each light source is driven by a pulse driving signal and used to form an RGB sub-frame. For example, the green light source is used to form a green subframe in an RGB sequential manner.

Referring to FIG. 3, the optical system 500 may include light sources 512, 514, and 516 that generate red, green, and blue lights for realizing an image according to a driving signal input from the driver 400. A spatial light modulator 570 for line modulating and outputting light incident on the image data input from the SOM controller 300, and a scanner for projecting light incident from the spatial light modulator 570 onto a screen by a line scan method 590.

3 is a diagram illustrating a detailed configuration of the optical system 500, and FIG. 4 is a perspective view illustrating the illumination lens system 540 illustrated in FIG. 3.

The optical system 500 includes a red light source 512 for generating red light, a green light source 514 for generating green light, a blue light source 516 for generating blue light, and incident light through reflection. First and second mirrors 522 and 524 for changing the path of light, first to ninth lenses 532 to 550 for focusing, diverging or collimating light through refraction, and incident light as an electrical signal A photodetector 518, a first filter 562 for performing partial reflection and partial transmission of the incident light, and second and third filters 564,566 for performing transmission or reflection according to the wavelength of the incident light; , A spatial light modulator 570 for performing modulation of incident light through reflective diffraction, an aperture stop 580 for limiting a spot size of the incident light, and incident light in the form of a line through rotational reflection A scanner 590 for line scan to form a two-dimensional image All.

Before describing each of the above-described components in detail, a brief description will be given of a traveling path for each of the red light, the green light, and the blue light. In addition, since the projector 500 sequentially projects a red image, a green image, and a blue image on the screen, a plurality of lights among the red light, the green light, and the blue light travel in the same path simultaneously in the optical system 500. It doesn't.

The green light emitted from the green light source 514 is reflected by the first mirror 522, passes through the first lens 532, is partially reflected by the first filter 562, and The second lens 534 and the second filter 564, and is reflected by the third filter 566, and transmitted through the fifth to seventh lens 542, the spatial light modulator 570 Reflected by the second lens 548, transmitted by the eighth lens 548, reflected by the second mirror 524, transmitted by the ninth lens 550, passed through the aperture 580, and Reflected by the scanner.

The red light emitted from the red light source 512 passes through the third lens 536, is reflected by the second filter 564, and is reflected by the third filter 566. Transmitted through the fifth to seventh lenses 542 to 546, reflected by the spatial light modulator 570, transmitted through the eighth lens 548, reflected by the second mirror 524, and The light penetrates the ninth lens 550, passes through the aperture 580, and is reflected by the scanner 590.

The blue light emitted from the blue light source 516 is reflected by the third filter 566, passes through the fifth to seventh lenses 542 to 546, and is transmitted by the spatial light modulator 570. Reflected, transmitted through the eighth lens 548, reflected by the second mirror 570, transmitted through the ninth lens 550, passed through the aperture 580, and the scanner 590 ) Is reflected.

Next, the components will be described in detail.

The green light source 514 operates by a driving signal input from the driver 400, and outputs green light having a wavelength of 532 nm ± 5 nm, for example. The green light may be obtained through a method of generating second harmonics so that light of a relatively long wavelength is converted into light of a relatively short wavelength.

It is a figure which shows the structural example of the green light source of FIG.

The green light source 800 includes a stem 810, a plurality of leads 822, 824, a thermal electronic cooler TEC 830, a submount 840, and a pump. A pumping light source 850, a wavelength converter 860, a housing 870, and a sight glass 880 are included.

The stem 810 functions as a substrate of the green light source 800, and may have a single layer structure made of a material such as KORVA or a clad structure in which layers of different materials are stacked. Each layer in the clad structure may have a material such as Fe, Cu. For example, the stem may have a structure in which Fe layers, Cu layers, and Fe layers are sequentially stacked.

The plurality of leads 822 and 824 penetrate the stem 810 in a thickness direction, and the plurality of leads 822 and 824 function as a passage for providing a driving signal to the pumping light source 850 and the thermoelectric cooling element 830. The drive signal is provided by the light source driver 410 as shown in FIG. 8. The leads 822 and 824 protrude from the top surface of the stem 810 and are wire bonded with the pumping light source 850 and the thermoelectric cooling element 830. In order to avoid interference between the wires during the wire bonding, the protruding heights of the leads 822 and 824 may be variously set.

The thermoelectric cooling element 830 is mounted on the upper surface of the stem 810 and functions to maintain a constant operating temperature of the pumping light source 850 and the wavelength converter 860.

The submount 840 is mounted on the upper surface of the thermoelectric cooling element 830 and used to position the pumping light source 850 and the wavelength converter 860.

The pumping light source 850 is mounted on the upper surface of the submount 840 and provides pumping light to the wavelength converter 860. For example, as the pumping light source 850, a semiconductor laser that generates pumping light having a wavelength band of 810 nm may be used.

The wavelength converter 860 includes a laser 862 and a nonlinear crystal 864, and an upper surface of the thermoelectric cooling element 830 such that one end of the laser 862 faces an output end of the pumping light source 850. Is mounted on.

The housing 870 mounts (in other words, covers) the leads 822, 824, the thermoelectric cooling element 830, the sub mount 840, the pumping light source 850 and the wavelength converter 860 therein. An opening is attached to the top surface of the stem 810 and faces an output end of the wavelength converter 860 (more specifically, an output end of the nonlinear crystal 864).

The sight glass 880 is attached to an inner surface of the housing 870 to cover the opening 872 of the housing 870 from the inside. As the sight glass 880, an optical thin film filter such as an anti-reflection coated anti-reflective filter and a wavelength selective filter for transmitting only light having a green wavelength may be used. In addition, in order to prevent noise caused by light reflected from the sight glass 880, the sight glass 880 is installed at an angle of 1 to 10 degrees with respect to the traveling direction of the light.

Referring to FIG. 3 again, the first mirror 522 reflects the green light incident from the green light source 814 toward the first lens 532. The first mirror 522 serves to reduce the volume of the optical system 500 by bending the optical path from the green light source 514 to the first lens 832 by 90 °. That is, the green light source 514 has a large volume and is preferably disposed at the center of the optical system 500. In this case, when the green light source 500 and the first lens 532 are disposed in a straight line, The volume of the optical system 500 is greatly increased. Therefore, the optical system 500 has a structure in which the green light source 514 is positioned at the center thereof, and the remaining components are arranged around the green light source 514. The first and second mirrors 522 and 524 and the scan mirrors 592 of the scanner 600 may each have a structure in which a dielectric layer or a metal layer having high reflectivity is deposited on a substrate.

The first lens 532 emits the green light incident from the first mirror 522 (in other words, increases the spot size of the incident light) and exits the first filter 562. As the first lens 532, a general diverging lens such as a concave lens may be used.

The first filter 562 partially reflects and partially transmits green light incident from the first lens 532. A portion of the green light passes through the first filter 562 and is incident to the photodetector 518, and the rest of the green light is reflected by the first filter 562 and is incident to the second lens 534. do. The first filter 562 functions to reduce the volume of the optical system 500 by bending the optical path from the first lens path 532 to the second lens 534 by 90 °. As the first filter 562, a conventional beam splitter or a half mirror may be used.

The photodetector 518 detects the green light incident from the first filter 562 as an electric signal and outputs it to the light source driver 410, and the light source driver 410 is configured to output the power of the green light from the detection signal. Derived by using the control, the green light source 514 to output a green light of a constant power. As the photodetector 518, a conventional photodiode may be used.

The second lens 534 collimates the green light incident from the first filter 562 and outputs the collimated green light to the second filter 564. As the second lens 534, a conventional convex lens may be used.

The red light source 512 operates by a driving signal input from the light source driver 410, and outputs red light having a wavelength of 640 nm ± 10 nm, for example. As the red light source 512, a conventional laser diode may be used.

The third lens 536 collimates the red light incident from the red light source 512 and emits the light to the second filter 564. As the third lens 536, a conventional convex lens may be used.

The second filter 564 reflects the red light incident from the third lens 536 and exits the third filter 566, or transmits the green light incident from the second lens 534 to transmit the green light. It exits to the third filter 566. The second filter 566 may use a conventional wavelength selective filter that reflects light of a red wavelength and transmits light of a green wavelength. For example, such a wavelength selective filter may be used on a glass substrate. It can be implemented by depositing a thin film of.

The blue light source 516 operates by a driving signal input from the light source driver 410, and outputs blue light having a wavelength of 440 nm ± 10 nm, for example. As the blue light source 516, a conventional laser diode may be used.

The fourth lens 538 collimates the blue light incident from the blue light source 516 and emits the light to the third filter 566. A general convex lens may be used as the fourth lens 538.

The third filter 566 reflects the red or green light incident from the second filter 564 and exits the fifth lens 542 or transmits blue light incident from the fourth lens 538. And exits to the fifth lens 542. The third filter 566 functions to reduce the volume of the optical system 500 by bending the optical path from the second filter 564 to the fifth lens 542 by 90 °. The third filter 566 may use a conventional wavelength selective filter that reflects light of red and green wavelengths and transmits light of blue wavelengths. For example, the wavelength selective filter may be formed on a glass substrate. It can be implemented by depositing a plurality of thin films on.

The fifth to seventh lenses 542 to 546 constitute an illumination lens system 540, and the illumination lens system 540 includes light (red, green, or blue light) incident from the third filter 566. The incident light is refracted to be linearized on the input / output end of the spatial light modulator 570.

First, the light incident on the fifth lens 542 is collimated.

The fifth lens 542 emits light incident from the third filter 566 only in a first direction (direction perpendicular to the traveling direction of the light), and is perpendicular to both the first direction and the traveling direction of the light. The second direction is transmitted as it is and exits to the sixth lens 544. A concave-plane cylinder lens may be used as the fifth lens 542, wherein the lens has a concave surface curved along the first direction.

The sixth lens 544 collimates the light incident from the fifth lens 542 with respect to the first direction to provide the collimated light with respect to both the first and second directions with the seventh lens 546. Exit As the sixth lens 544, a planar-convex cylinder lens may be used, wherein the lens has a convex surface curved along the first direction.

The seventh lens 546 focuses the light incident from the sixth lens 544 only in the second direction (in other words, on the input / output end of the spatial light modulator 570 in the second direction). Converge to form a focal point), and transmit the light in the first direction to the spatial light modulator 570. As the seventh lens 546, a convex-plane cylinder lens may be used, wherein the lens has a convex surface that is curved along the second direction.

The spatial light modulator 570 operates by the image data input from the SOM controller 300, and the image data has information on any one pixel column of the projection image 595. The spatial light modulator 570 linearly modulates the linearized light incident from the seventh lens 546 through the reflective diffraction and exits the eighth lens 548. The spatial light modulator 570 includes as many diffraction elements as the number of pixel rows of the projected image 595 on its input and output terminals. That is, assuming that the resolution of the projection image is M * N (M pixel rows and N pixel columns), the spatial light modulator 570 includes M diffractive elements. Each diffraction element diffracts and reflects incident light, and the power of the diffracted light is determined by corresponding pixel information. A number of such spatial light modulators 570 have been disclosed in the related art, and as an example, Korean Patent Publication No. 2006-47478 (Open Hole-based Diffraction Light Modulator), which was invented by Yoon Sang-kyung, discloses a bottom reflection on a base member. An open-hole-based diffractive light modulator is disclosed that can form one pixel with an element having one ribbon-shaped upper micromirror by forming a portion and having an open hole in an upper micromirror spaced from a base member.

Unlike the present embodiment, the reflective diffractive spatial light modulator is replaced with a reflective digital light processing (DLP) panel, a liquid crystal on silicon (LCoS) panel, a transmissive LCD panel, a 1D or It may be replaced by 2D micro electro mechanical systems (MEMS) or by a conventional grating light valve (GLV) or GEMS.

The eighth lens 548 focuses the light incident from the spatial light modulator 570 and emits the light to the second mirror 524. As the eighth lens 548, a conventional convex lens may be used.

The second mirror 548 reflects light incident from the eighth lens 548 to the ninth lens 550.

The ninth lens 550 is a projection lens that converges (or focuses) the light incident from the second mirror 524 so that a focus is formed on the reflective surface of the scan mirror 592 with respect to the first direction. And focus to form a focus on the screen with respect to the second direction and exit to the scanner 590. The light reflected by the scan mirror 592 is divergent with respect to the first direction and focused with respect to the second direction. As the ninth lens 550, a conventional convex lens may be used.

The seventh lens 546 focuses the light incident from the sixth lens 544 only in the second direction (in other words, on the input / output end of the spatial light modulator 570 in the second direction). Converge to form a focal point), and transmit the light in the first direction to the spatial light modulator 570. As the seventh lens 546, a convex-plane cylinder lens may be used, wherein the lens has a convex surface that is curved along the second direction.

The aperture 580 is positioned on the optical paths of the ninth lens 550 and the scanner 590, and functions to limit the spot size of the light incident on the scanner 590. That is, the aperture 580 blocks a portion of the light incident from the ninth lens 550 (diffraction light of the first mode or more), and passes the rest (diffraction light of the 0th mode) to the scanner 590. By doing so, the noise component of the projected image is removed. To this end, the stop 580 has a body having a rectangular block shape, and a rectangular opening penetrating the body. The aperture 580 may be made of aluminum.

The scanner 590 is operated by a driving signal input from the scanner driver 420, and projects the light incident from the spatial light modulator 570 onto a screen by a line scan method. The scanner 590 includes a scan mirror 592 that swings in a clockwise or counterclockwise direction about a rotation axis 594 according to a predetermined period. At any point in time, the image projected on the screen is displayed in the form of a line corresponding to one pixel column, and the line image is moved left and right in the pixel row direction by the rotation of the scan mirror 592 to implement an image frame. . For example, when the scan mirror 592 rotates clockwise, a red subframe is implemented. When the scan mirror rotates counterclockwise, a green subframe is implemented, and the scan mirror rotates clockwise. A blue subframe is implemented, and one color frame is implemented by a combination of the red, green, and blue subframes.

Fig. 5A is a perspective view showing one configuration example of a scanner, and Fig. 5B is a front view showing the scanner.

The scanner 600 includes a scan mirror 610, an upper 640, and a lower support 630.

The scan mirror 610 is installed on the upper and lower supports 640 and 630 to swing swing about the rotation axis 620.

The lower supporter 630 supports the lower part of the rotation shaft 620 and swings the scan mirror 610 by periodically rotating the rotation shaft 620 in a clockwise or counterclockwise direction. The rotation angle range in the clockwise or counterclockwise direction may be arbitrarily set in consideration of various matters (such as the size of the projected image), and may be set to 15 °, for example. The lower supporter 630 rotates the rotation shaft 620 by a Lorentz force generated by applying a current to the coil in the magnetic field, and the magnet or the coil may move. In addition, the scanner 600 is not a one-way rotation method using a conventional motor, but a swing rotation method in a set rotation angle range, so that an open loop or high precision server without feedback is provided. It is desirable to take a (servo) drive mode.

The upper support part 640 supports an upper part of the rotating shaft 620 and functions as a driving device having the same configuration as the lower support part 630, or to detect each position of the scan mirror 610. Can function as a device. For example, a driving unit including a coil and a magnet capable of driving the scan mirror 610 may be disposed on the lower support 630, and the detection unit including a Hall sensor and a metering magnet may be disposed on the upper support 640. Can be arranged, and vice versa. In addition, for example, a light detecting diode (LED) emitting light in the upper support part 640 and / or the lower support part 630, a filter structure and a light which decreases the amount of light according to an angle of the light detection method. When the photodetector for detecting the signal as an electrical signal is disposed, a difference in the detection signal according to the angle can be ensured, and the scan mirror 610 is controlled from the detection signal so as to swing swing with an accurate angle range at a predetermined cycle. In addition, a structure in which a photodetector is disposed in a space between the upper support 640 and the lower support 630, that is, a space behind the scan mirror 610 may be adopted.

Fig. 6A is a perspective view showing another example of the configuration of the scanner, Fig. 6B is a front view showing the scanner, Fig. 6C is a side view showing the scanner, and Fig. 6D is a perspective view showing the aperture.

The scanner 650 includes a scan mirror 660, upper and lower supports 690 and 680, and an aperture 700.

The scan mirror 660 is installed on the upper and lower supports 690 and 680 to swing swing about the rotation axis 670.

The lower supporter 690 supports the lower part of the rotation shaft 670 and swings the scan mirror 660 by periodically rotating the rotation shaft 670 in a clockwise or counterclockwise direction.

The upper support part 690 supports an upper part of the rotation shaft 680 and functions as a driving device having the same configuration as the lower support part 680 or detects each position of the scan mirror 660. Can function as a device.

As an example of a detection apparatus for identifying each position of the scan mirror, US Patent No. US 5,844,673, which is invented and patented by Ivers, Richard J., describes the angular position of a rotatable element. The light emitted from the light emitting diode light source is adjusted according to the rotation angle of the scan mirror and is incident on the photodetector (photodiode) composed of quadrants. Accordingly, the rotation angle of the scan mirror is determined by the detected photocurrent value. A photodetector for grasping is disclosed.

The aperture 700 is disposed at one side of the scan mirror 592 to be positioned on an optical path of the ninth lens 550 and the scan mirror 592, and is fixed by the upper and lower supports 690 and 680. The spot size of the light incident on the scan mirror 660 is limited. The aperture 660 includes a body 710 having a rectangular block shape, and a rectangular opening 720 penetrating the body. For example, the stop 700 may be manufactured by cutting and joining a metal plate, or may be manufactured through a press die. In addition, the aperture 700 may be fixed by sandwiching the upper and lower support portions 690 and 680. In the case of fixing in this manner, by making some of the four side edges of the diaphragm 700 slightly open so that each corner portion has elasticity, such fixing can be made easier.

8 is a diagram illustrating a detailed circuit configuration of the SOM controller 300 shown in FIG. 2. The SOM control unit 300 receives a control signal and image data from the control unit 140 provided in the portable terminal 100. The controller 140 may generally be in charge of a mobile station modem (MSM), a digital signal processor (DSP), or an application accessor (AP). In the present invention, the configuration using the scaler 160 follows.

The SOM controller 300 includes a processor 320, a memory 310, and a SOM interface circuit 575.

The memory 310 stores initial values loaded during the initialization of the processor 320. When the power is supplied to the processor 310, the register values of the processor are initial values stored in the memory 310. Is set to. A flash memory may be used as the memory 310.

The processor 320 may include a communication interface circuit (I / F, 350), a core (330), a buffer (340), and first to third digital / analog conversion circuits (DACs, 362, 364, 366). Include. The processor 320 may be implemented as an application specific integrated circuit (ASIC).

Control signal communication between the processor 320 and the controller 140 may take an I 2 C method or a serial peripheral interface (SPI) method. To this end, the processor 320 includes the communication interface circuit 350.

The communication between the memory 310 and the processor 320 may take an I 2 C method or a serial peripheral interface (SPI) method.

The core 330 receives image data from the controller 140 and stores the input image data in the buffer 340. The core 330 processes the image data in a form capable of line scan timing control of an RGB sequential driving method with respect to the spatial light modulator 570, and outputs the processed image data to the spatial light modulator 570. do. That is, assuming that the resolution of the projection image is M * N (M pixel rows and N pixel columns), for example, the core 330 sequentially processes the red, green, and blue image data for the p-th pixel column. P repeats the process from 1 to N. In addition, the core 330 includes the light source driver 410 and the scanner driver 420 so that the red, green, and blue light sources 512, 514, 516, the scanner 590, and the spatial light modulator 570 may be driven in synchronization. Each provides a synchronization signal. The synchronization signals are provided to the light source driver 410 and the scanner 420 driver through first and second digital / analog conversion circuits 364 and 366. Each of the digital / analog conversion circuits 362, 364, and 366 performs a function of converting an input digital signal into an analog signal and outputting the analog signal. In addition, the core 330 outputs a gamma control signal for adjusting the gamma of the spatial light modulator 570 to the spatial light modulator 570 through the third digital / analog conversion circuit 362.

The spatial light modulator 570 is provided with the interface circuit (SOM I / F) 575, and the interface circuit 575 converts the digital image data input from the core 330 into an analog signal to convert the spatial light into a spatial light. Output to modulator 570. In addition, the interface circuit 575 sets an operating range of the spatial light modulator 590 according to a gamma control signal input from the third digital / analog conversion circuit 362.

The portable terminal 100 includes a plurality of power supply units 182 and 184, and the processor 320 is provided with a voltage of 1.8 V for driving the core 330 and a voltage of 3.3 V for signal input / output, A voltage of 3.3 V is provided to each of the light source driver 410 and the scanner driver 420. A voltage of 12 V is provided to the interface circuit 575 of the spatial light modulator 570, and the voltage of 12 V is 3.3. Provided through the process of boosting the V voltage. In order to prevent image degradation due to crosstalk between the power supplies 182 and 184, the light source driver 410 and the scanner driver 420 are powered by different power supplies.

9 shows a timing diagram for driving the projector 200. 9A illustrates an angular position of the scanner 590, FIG. 9B illustrates a driving signal for light sources 512 to 516, and FIG. 9C illustrates the scanner 590. Referring to FIG. 9D shows a drive signal of the spatial light modulator 570. FIG.

The RGB sequential driving method refers to a method of implementing one color frame by sequentially implementing a red subframe, a green subframe, and a blue subframe. Optionally, as shown in Fig. 9B, by allowing the color X (R / G / B) of the fourth subframe to be selectively set, flexibility in color representation can be achieved. Since the spatial light modulator 570 forms a line image in the pixel column direction, one subframe is formed by the scanner moving and projecting the line image in the pixel row direction. In this embodiment, one color frame is implemented through two swing rotations. For example, to form a 640 * 480 VGA subframe, the spatial light modulator 570 must have 480 pixels, and the scanner 590 rotates in one direction (1/2 swing rotation) to 640 lines. The image is projected on the screen. In this case, the pixel time of the spatial light modulator 570 (in other words, the time of maintaining one pixel representation state) is about 5 ms, and the time required to form one subframe is about 4.2 ms.

As shown in FIG. 9B, a blank time exists between subframes, which correspond to left and right ends of the projected image as a time region in which the operation speed of the scanner 590 is rapidly changed. Image distortion is prevented by not projecting light during this blank time.

10 is a view for explaining a heat diffusion structure of the projector module. The illustrated projector module 500 ′ mounts the optical system 500 shown in FIG. 3 to the case 502, and the SOM controller 300 as shown in FIG. 2 on the top and bottom of the case 502, The upper and lower circuit boards 910 and 915 to which the driving unit 400 is integrated are attached. Since the projector module 500 'includes red, green, and blue light sources, the amount of heat generated by the light sources, particularly the green light source, is very large. As shown, a hot spot 504 is formed at a portion where the green light source is located. Thus, a structure is provided to diffuse heat concentrated in the hot spot 504 to the entire module 500 '.

A first type of thermal conductive film 920 is interposed between the upper circuit board 910 and an upper end of the case 502, and between the upper circuit board 910 and the first type of thermal conductive film 920. The second type of thermal conductive film 930 is interposed therebetween. In this case, the first type of thermally conductive film 920 may be in close contact with at least a component of the optical system 500 (especially, the green light source 514) positioned at the hot spot 504. The first type of thermal conductive film 920 has a relatively high thermal conductivity and a small buffering force, and the second type of thermal conductive film 930 has a relatively low thermal conductivity and a large buffering force. For example, the first type of thermal conductive film 920 has a thermal conductivity of 100 to 1000 W / mK and a thickness of 0.1 to 1.0 mm, and the second type of thermal conductive film 930 has a thermal conductivity of 0.5 to 10 W / mK. It has a thickness of 0.5-2 mm. In addition, when the projector module 500 ′ is mounted on the main circuit board 940, a second type of thermal conductive film (2) is provided on the side of the lower circuit board 915 and the main circuit board 940 having a large surface curvature ( 935 is positioned, and the thermal conductivity film 925 of the first type is positioned on the side of which surface curvature is small. As illustrated, the first and second types of thermal conductive films 925 and 935 are sequentially positioned in the direction of the lower circuit board 915 having the large surface curvature in the main circuit board 940 having the small surface curvature.

As described above, the heat diffusion structures using the heat conductive films 920 to 935 have advantages in that the processing cost is lower than that of the metal heat diffusion structures, and the risk of changing the alignment state of the optical system 500 is reduced.

Although the projector according to the present invention is illustrated as being embedded in the portable terminal, the projector according to the present invention may be provided in the form of an accessory connected to the portable terminal using a cable.

As described above, the portable terminal according to the present invention has the following advantages.

First, by providing a projector having a small optical system using a spatial light modulator, there is an advantage that can be embedded in a portable terminal.

Second, there is an advantage to provide a portable terminal having a projector to enlarge and view the content to be shared by several people, such as moving pictures, still images, e-books to 10 to 40 inches.

Third, there is an advantage that can effectively dissipate the heat generated by the projector by adopting a heat diffusion structure using a thermal conductive film.

Claims (14)

In a portable terminal, A projector for projecting an image by a line scan method; And a control unit for providing image data to the projector. The method of claim 1, And a scaler for converting low resolution image data input from the controller into high resolution image data and outputting the image data to the projector. The method of claim 1, And a display unit for displaying an image according to the image data input from the controller on the screen. The method of claim 3, The control unit selectively operates one of the projector and the display unit. The method of claim 3, And a switch for selectively outputting image data input from the controller to the display unit or the projector. The method of claim 3, And the controller selectively outputs the same image signal to one of the projector and the display unit. The method of claim 1, wherein the projector, A plurality of light sources for generating lights of different colors; A spatial light modulator for line modulating and outputting the light; And a scanner for projecting light incident from the spatial light modulator by a line scan method. The method of claim 7, wherein the scanner, A scan mirror swing swinging about an axis of rotation; A lower support part rotatably supporting a lower portion of the rotation shaft and swinging the scan mirror; And an upper support portion rotatably supporting an upper portion of the rotation shaft. The method of claim 8, The scanner further comprises an aperture fixed by at least one of the upper and lower supports, the aperture limiting the spot size of the light incident on the scan mirror. The method of claim 7, wherein The projector further comprises at least one thermal conductive film for diffusing heat concentrated in at least one of the light sources. The method of claim 7, wherein The spatial light modulator is a portable terminal, characterized in that for outputting the line-modulated incident light through the reflective diffraction. The method of claim 11, The spatial light modulator is a portable terminal, characterized in that for diffracting and reflecting the incident light and a plurality of diffractive elements arranged in a line form on the input and output end thereof. The method of claim 7, wherein One of the plurality of light sources is a portable terminal, characterized in that the green light source for generating a second harmonic. The method of claim 13, The green light source is driven by a pulse driving signal, the green light source is used to form a green sub-frame of the RGB sequential method.

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