KR20060053509A - Lcd tv having video projection system - Google Patents

Abstract

The present invention relates to an LCD combined video projection system capable of providing an adjustment function for the user to enlarge or reduce the size of the screen of the video signal displayed on the projection as needed. Such a combined video projection system according to the present invention, the image processing unit for interfacing the input image signal to be displayed on the flat-panel image display; A switching unit for selectively outputting an image signal output from the image processing unit to a projection or the flat panel image display; It is composed of a microprocessor for applying a control signal for controlling the output path of the switching unit according to the user's control, the user to adjust the size and focus of the screen displayed on the screen by adjusting the lens assembly provided in the projection It is characterized by.

Switching unit, lens assembly, image processing unit, projection, LCD

Description

LCD TV Having Video Projection System

1 is a block diagram of a typical LCD TV.

2 is a block diagram of an LCD combined video projection system according to the present invention.

3 is an explanatory diagram for explaining the operation principle of the projection unit shown in FIG.

4 is a control flowchart for explaining a part of the operation of the LCD combined video projection system according to the present invention.

* Description of the symbols for the main parts of the drawings *

11: YUV switch 12: analog to digital converter

13: TMDS receiver 14: AV switch

15 video decoder 16 de-interlacer

17: image processor 18: image enhancement processor

19: switching unit 20: microprocessor

21: low voltage processor 22: LCD

30: projection unit 31: video converter

32: digital light processor 33: color filter                 

34 lens assembly 35 screen

The present invention relates to an LCD combined video projection system, and more particularly, to an LCD combined video projection system that allows a user to enlarge the size of an image screen if necessary by using video projection characteristics.

1 is a block diagram of a typical LCD projection TV. Referring to FIG. 1, the LCD projection TV converts a broadcast signal received from an antenna into a tuner 100 and a broadcast signal tuned through the tuner 100 into a processable video signal. The demodulator 110, the ADC 120 for converting the signal converted by the demodulator 110 into a digital signal, and the digital signal for processing the digital signal output from the ADC 120 into a displayable signal on the screen. The processor 130, the first display unit 190 for displaying the image signal processed by the digital signal processor 130, the power supply unit 140 for supplying power to the system, and the user's request command The user interface 150 for input, the lamp driver 170 for driving a lamp (not shown) according to the control signal of the controller 160, and the driving of the lamp driver 170 When the program (not shown) is operated, a first display unit 190 for displaying an image signal processed by the digital signal processor 130 and a delay time for booting the TV until the lamp (not shown) is driven. Memory 180 for storing, the second display unit 200 for displaying the driving progress of the lamp (not shown), and when the user inputs a power-on command through the user interface 150 (Not shown) outputs a control signal to the lamp driving unit 170, and displays the lamp driving progress on the second display unit 200 with reference to the boot delay time pre-stored in the memory 180. It is configured to include a control unit 160 for outputting a control signal.

However, the conventional LCD projection TV provides only a fixed screen size when displaying a predetermined image signal on a screen by using a projection function.

If the user can adjust the size of the screen of the TV according to the nature of the video program to watch, genre, location, number of viewers, and viewing time, it will be very useful. For example, a video program requires a different screen size according to the nature and genre of a program such as a movie program, a sports relay program, a preview program, and a music program.

In addition, the size of the screen is required differently depending on the width of the place where the LCD projection TV is installed and whether it is for home or business use.

In addition, the size of the screen is required to vary depending on the number of viewers watching the video program and the viewing time.

As a result, the conventional LCD projection TV has a disadvantage that does not meet the various needs of users for the adjustment of the screen size.                         

An object of the present invention is to solve the problems of the prior art mentioned above, the user can provide a combined video projection that can provide an adjustment function to enlarge or reduce the size of the video screen displayed through the projection as necessary It is to provide a system.

Another object of the present invention is to provide an LCD combined video projection system that allows a user to adjust the size of the screen by adjusting the focus of the lens provided in the optical system of the projection.

In order to achieve the above object, an LCD combined video projection system according to the present invention, the image processing unit for interfacing the input image signal to be displayed on the flat-panel image display; A switching unit for selectively outputting an image signal output from the image processing unit to a projection or the flat panel image display; It is composed of a microprocessor for applying a control signal for controlling the output path of the switching unit according to the user's control, the user to adjust the size and focus of the screen displayed on the screen by adjusting the lens assembly provided in the projection It is characterized by.

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the present invention.

2 is a block diagram of an LCD combined video projection system according to the present invention. Referring to FIG. 2, the LCD combined video projection system of the present invention converts an input video signal into DTV Y / Cb / Cr and IDTV Y / Cb / Cr in which the luminance signal Y and the color signal C are separated. A YUV switch 11 for separating; An analog / digital converter 12 for converting an analog signal output from the YUV switch 11 or an analog signal input from a computer into a digital signal; A transition minimized differential signal (TMDS) receiver 13 for interfacing a digital video signal input from a computer; Receives at least one analog composite video broadcast signal (CVBS) and an audio video signal (AV) to separate the luminance signal (Y) and the color signal (C) included in the video signal. An AV switch 14 for outputting; A video decoder 15 for decoding the color information included in the luminance signal and the color signal output from the YUV switch 11 or the AV switch 14; A de-interlacer 16 for converting a scanning direction of an image signal output from the analog / digital converter 12 or the video decoder 15; An image processor 17 for receiving an image signal output from the analog-to-digital converter 12, the TMDS receiver 13, or the de-interlacer 16 so as to be displayed on the LCD 22; An image enhancement processor 18 for performing a procedure of improving the image quality of the image signal output from the image processor 17; A switching unit 19 for selectively controlling an output path of the image enhancement processor 18 according to a user's control; A low voltage processor (LVDS) 21 for interfacing the video signal output from the switching unit 19 to be displayed on the LCD 22; An LCD 22 for displaying an image signal output from the low voltage processor 21; A projector unit 30 for displaying an image signal output from the switching unit 19 on a predetermined screen; The microprocessor 20 controls the output path of the switching unit 19 under the control of the user, and controls the size and focus of the image signal processed by the projector unit 30.

Here, the projector unit 30 includes an image converter 31 for converting an image signal output from the switching unit 19 into an optical image signal; 3, a digital light processing unit (DLP) 32 for adjusting an angle of reflection according to an optical image signal output from the image converter 31 and implementing an image image; A color wheel 33 for filtering to remove noise components included in the optical image signal output from the digital light processor 32; A lens assembly 34 for adjusting the size and focus of the optical image signal output from the color wheel 33 according to the control of the microprocessor; It is composed of a screen unit 35 for displaying an image signal output from the lens assembly (34).

The analog-to-digital converter 12 shown in FIG. 2 supports a digitization process that includes a voltage reference, a PLL for generating a pixel sampling clock from HSYNC, a clamping circuit, and a programmable offset and gain circuit that provides brightness and contrast control. To provide a high performance, high integration solution.

The TMDS receiver 12 also provides a digital-output function that is compatible with the built-in High-bandwidth Digital Content Protection (HDCP) function. This provides a simple, economical and efficient solution for digital TVs that implement DVI-HDCP. Preprogrammed HDCP keys are simple to manufacture and provide the highest level of security. There is no need to use encrypted keys, program EEPROMs or hardened epoxy coatings.

The AV switch 14 is also a TV 12C bus compatible AV switch. Both video and stereo audio systems have seven inputs and three outputs, respectively. Any input can be independently assigned to each output by 12C bus control. However, the same input is assigned to all three video and audio system outputs.

The video decoder 15 also takes a video signal from various digital video displays or recorded items, i.e. luminance and color signals, and decodes the color information contained therein. Digital 656 RGB, YUV and CVBS signals are provided thereto, and the decoded color signals are obtained as outputs such as blank, clk, CVBS, YUV, RGB and the like. This is the color decoder chip used in motherboards such as DTVs, LCD TVs, camcorders, video cameras and PCs.

De-Interlacer 16 is also a highly integrated digital video format converter for flat panel TVs and digital projectors. It uses high flexibility scaling, various aspect ratio conversions, and features that enhance the characteristics of a particular video signal and certain deinterlacing and post processing algorithms to produce the highest quality images.

Image processor 17 is a highly integrated “system-on-chip” that interfaces computer graphics and video inputs in virtually any format to a flat panel display with a fixed frequency. It supports format conversion using multiple programmable regions.

In addition, the image enhancement processor 18 provides a powerful and diverse function of improving the image quality of images in various display environments (eg, TV, monitor, projection, projector, etc.) using LCD, PDP, and the like. The image enhancement processor 18 may enhance an edge enhancement function to improve the clarity of the image, a color enhancement function to adjust the color according to the user's preference, and emphasize the contrast according to the brightness of the image. Contrast Enhancement function, color compensation function to achieve natural white color according to the display device's physical characteristics, and conversion setting assistant function to provide information necessary to adjust the setting of external analog / digital converter.

In addition, although various switching elements may be used for the switching part 19, it is preferable that a 1x2 De-Mux switch is used for this invention.

Microprocessor 20 is also a 16-bit controller with embedded teletext and graphics controller functionality, which can be used in a wide range of TV and OSD applications.

In addition, the Low Voltage Differential Signaling (LVDS) 21 converts the 24-bit RGB signal into an LVDS signal to interface with the LCD 22. In other words, LVDS is a transmission method for sending digital information to a flat panel display at high speed through a copper wire, where LV, or low voltage, indicates that LVDS uses 3.3V or 1.5V instead of 5V, which is a standard voltage.

The image converter 31 of the projector unit 30 also converts a 24-bit RGB signal into a projection optical signal (optical signal).

In addition, the Digital Light Processing (DLP) 32 consists of one or more digital micro-mirror devices used to process optical signals. Such a DLP allows tens of thousands of fine mirrors to adjust the angle of reflection according to the signal. And implement the image.

In addition, the lens assembly 34 adjusts the size and focus of the image projected on the screen unit 35, and provides a relatively larger screen than the conventional one to generate a theater effect.

An operation of an LCD combined video projection system according to the present invention having such a configuration will be described with reference to the accompanying drawings.

2 and 4, after the user uses the TV control panel, the screen touch function or the power-on (S10) using the remote control, the user presses the menu key (S11). Since the menu key includes an LCD TV mode key and a projection mode key, the user selects a desired mode key (S12).

The microprocessor 20 controls the current default mode to be automatically set to the LCD mode when the user first powers on. However, if necessary, the microprocessor 20 may be controlled to change the initial default mode to the projection mode.

Meanwhile, the TV mode key and the projection mode key may be directly provided to the control panel, the screen touch function, or the remote control without a separate menu key, and the user may press the desired mode key without pressing the menu key. S13).

Therefore, the microprocessor 20 receives the mode selection control command input through the step S12 or S13, and determines whether the projection mode is selected (S14).

As a result of the determination step S14, when it is determined that the user has selected the projection mode key, the microprocessor 20 outputs the switching unit 19 so that the output of the processed image signal input into the system is transmitted to the projection unit 30. The terminal is controlled (S15).

On the other hand, when the user selects no mode key or the LCD mode key, the microprocessor 20 inputs into the system and outputs the processed image signal. Control the output terminal of the switching unit 19 to be transmitted to (S16).

In addition, the microprocessor 20 repeatedly performs the control operation of step S14 and below whenever a mode selection-related control key is input as the user wants to change the current mode.

Hereinafter, with reference to the accompanying FIG. 2, the control procedure of the video signal in the case of an LCD combined video projection system according to the present invention will be described.

The video signal input to the LCD combined video projection system according to the present invention depends on the nature of the connected terminal.

For example, an image signal input to an LCD combined video projection system may be 1) a composite broadcast signal wirelessly transmitted from a broadcasting station such as an RF / analog mode; 2) a digital video signal provided by another video reproducing apparatus (video device) such as AV-1 / 2/3 mode, and 3) a video signal provided via a coaxial cable such as component mode; 4) It may be an analog video signal or a digital video signal provided by a computer such as a DVI / PC mode.

First, in the RF / analog mode, a broadcast signal propagated by a broadcasting station is supplied to an analog tuner (not shown) via an antenna via an RF splitter.

After the broadcast signal input to the tuner is separated from the audio signal and the video signal, the audio signal SIF is input to an audio signal processor (not shown), and the analog composite broadcast signal CVBS is connected to the AV switch 14 of FIG. ) Are input to the RF input.

The video signal input to the AV switch 14 is output as a video signal separated into a luminance signal and a color signal, and then transmitted to the video decoder 15. The video decoder 15 decodes the color information included in the received video signal, and converts the color information into an ITU-R 656 8-bit Y / C video signal (that is, a video signal divided into a luminance signal and a color signal) to de-interleave the video signal. Transfer to racer 16. The de-interlacer 16 scans the 656 8-bit Y / C image signal in a sequential scanning manner to make it progressive and transmits a 4: 2: 2 16-bit YUV image signal to the image processor 17.

The 16-bit YUV video signal input to the image processing unit 17 is processed into a video signal such as advanced scaling and format conversion, and is processed and output as a 24-bit RGB video signal for the high-end flat panel image display. It amplifies the levels of the signals and is thus delivered to digital amplifiers (not shown) which feed them to the left and right speaker outputs.

The 24-bit RGB signal output from the image processor 17 is transmitted to the switching unit 19 which is a 2x1 de-mux switch after the image quality is improved by the image enhancement processor 18.

As a result, the 24-bit RGB signal of the improved quality is converted into a low voltage differential signal through the low voltage processing unit 21 according to the output path control of the switching unit 19, and interfaced with the LCD 22 through the LVDS cable to display the LCD 22. ) Is displayed on the screen.

Second, in the AV-1 / 2/3 mode, three different input signals (ie AV-1 from Full SCART, AV-2 from Half SCART and AV-3 from Side A / V) It is directly input to this AV switch 14.

The AV switch 14 delivers the AV audio signal to a sound processor (not shown), and the video signal to the video decoder 15.

Subsequent operations of the video decoder 15 are processed in the same procedure as in the case of the first RF / analog mode, so further description thereof is omitted.

Third, in the component mode, the video signal input through the coaxial cable is supplied to the YUV switch 11, and the audio signal is transmitted directly from the component input jack to a sound processor (not shown). The video signals inputted to the YUV switch 11 are output separately separated into DTV Y / Cb / Cr and IDTV Y / Cb / Cr. The digital format IDTV video is passed to the video decoder 15, with subsequent operations operating the same as the first RF / analog mode, while the analog format DTV video signal is passed to the analog / digital converter 12, It is converted to a 24-bit RGB signal and then passed to the de-interlacer 16.

Subsequent operations of the de-interlacer 16 are processed in the same procedure as in the case of the first RF / analog mode, so further description thereof is omitted.                     

Fourth, in the DVI / PC mode, the TMDS signal is input to the TMDS receiver 13 using panel link digital technology. The TMDS receiver 13 provides the function of supporting high resolution digital display and HDTV. When the input signal is an analog RGB video signal, the TMDS receiver 13 is input to the YUV switch 11 and is transmitted to an analog / digital converter 12 which converts the signal into a 24-bit RGB signal. Transfer directly to the processing unit 17.

Subsequent operations of the analog / digital converter 12 and the image processor 17 are processed in the same procedure as in the case of the first RF / analog mode, and thus, further description thereof will be omitted.

According to the LCD combined video projection system according to the present invention described above, the user can adjust the focus of the lens provided in the optical system of the projection to adjust the size of the screen displayed on the screen of the projection unit as necessary.

Therefore, the user can freely adjust the size of the screen of the TV according to the nature of the video program to be viewed, the genre, the location, the number of viewers, and the viewing time, thereby creating a desired viewing environment and conditions.

Claims (3)

An image processor for interfacing the input image signal to be displayed on a flat panel image display; A switching unit for selectively outputting an image signal output from the image processing unit to a projection or the flat panel image display; Microprocessor for outputting a control signal for controlling the output path of the switching unit according to the user's control, And the user adjusts the lens assembly provided in the projection to adjust the size and focus of the screen displayed on the screen. The display apparatus of claim 1, further comprising: a YUV switch for separating the input video signal into a video signal divided into a luminance signal and a color signal; An analog / digital converter for converting a video signal output from the YUV switch or a video signal input from the outside into a digital signal; A transition minimized differential signal (TMDS) receiver for interfacing an externally input digital video signal; An AV switch that receives at least one composite video broadcast signal (CVBS), an audio / video signal (AV), and separately outputs a luminance signal and a color signal included in the video signal; ; A video decoder for decoding color information included in an image signal output from the YUV switch or the AV switch; And a de-interlacer for converting a scanning direction of an image signal output from the analog / digital converter or the video decoder. The image enhancement processor of claim 1, wherein the image enhancement processor comprises: a first function of improving the sharpness of an image; a second function of adjusting color according to a user's preference; a third function of emphasizing contrast according to brightness of an image signal; An LCD combined video projection system, characterized in that it selectively provides a fourth function to achieve a natural white according to the physical characteristics of the image display.

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