KR20070031092A - Apparatus for color display of projection TV - Google Patents

Abstract

The present invention relates to a video device, and more particularly to a color display device of a projection TV. The present invention includes a plurality of LED driving unit for concentrating a light source of a unique color emitted from each LED element to irradiate the DMD chip; A DMD controller for controlling output pulses for driving the plurality of LED drivers; It characterized in that it comprises a DMD chip for implementing a predetermined color image as a light source irradiated from the LED driver. The plurality of LED drivers include: a first LED driver 110 using an LED device of R color as a light source; A second LED driver 120 having a G color LED element as a light source; And a third LED driver 130 using the LED element of B color as a light source. The DMD control unit simultaneously drives at least two or more specific driving units of the first to third LED driving units to form a color in which two or more colors are overlapped. Therefore, without the need for a color disc to make the conventional color, focusing the LED light source itself to directly irradiate the DMD chip to implement an image, and add a frame area according to the driving logic of R, G, B By configuring the frame area such as magenta, shiyan, and yellow separately, it is possible to improve the depth of color, and to compensate for the loss of brightness and signal distortion, it is possible to expand the gamut of color expression.

Projection, TV, Picture, Screen, Display, DLP, LED Element, Light Source, DMD

Description

Color display device of projection TV {Apparatus for color display of projection TV}

1 is a side cross-sectional view showing a schematic configuration of a conventional projection TV.

2 is a view for explaining a color display device of a conventional projection TV.

3 and 4 are block diagrams showing a color display device of a projection TV according to the present invention;

5 is a circuit diagram showing an LED driver according to the present invention.

6 is a view for explaining a color implementation method according to the drive pulse adjustment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: DMD control unit

110: first LED driver

120: second LED driver

130: third LED driver

140: DMD Chip

The present invention relates to a video device, and more particularly to a color display device of a projection TV.

As is well known, a projection TV is an imaging device having a relatively low price and high quality while implementing a large screen beyond the limitation of the screen size of a conventional CRT TV.

Projection TV is an all-in-one projector system with projectors, screens and TV tuners embedded in a set. The principle is to create an image in the projection engine and change the angle through the mirror to increase the projection distance and display the image on the screen. The screen is greatly enlarged and the screen is structured so that the image is diffused and transmitted using an antireflective material with a flannel lens.

As described above, a projection TV is a TV that reproduces a large screen image by a projection method using a small CRT, an optical mirror, a screen, and the like, and may be classified into a CRT, an LCD, a DLP method, and the like according to the projection method.

In particular, as the number of products based on semiconductor technologies such as DLP and LCoS, as well as high-temperature poly-LCD upgraded from CRT method, has increased recently, the price, performance, form factor, etc. are improved through fierce competition among various display methods in projection TV. And with the improvement of product competitiveness, the demand is greatly increased.

1 is a side cross-sectional view showing a schematic configuration of a conventional projection TV. As shown in the drawing, an optical engine 20 composed of a lamp, a projection lens, and various components is provided in a cabinet 10 constituting a main body of a projection TV. , An engine mounting bracket 30 on which the optical engine 20 is mounted, a base frame 40 on which the engine mounting bracket 30 is installed, and an inclined upper portion of the base frame 40. And a reflection mirror 60 that reflects the image projected from 20 to the screen 50.

FIG. 2 is a view for explaining a color display device of a conventional projection TV. In particular, FIG. 2 illustrates a projection TV of a digital light processing (DLP) system.

In general, a DLP projection TV refers to a projection TV of a projection method using a digital micromirror device (DMD) chip 22. The DMD is simply a semiconductor optical switch incorporating a fine driving mirror. Each 16 µm-size aluminum alloy micromirror formed on each cell of the static random access memory (SRAM) has an inclination of +/- 10 DEG per on / off state. The micromirrors installed on the posts are activated by the electrostatic action of the memory placed directly below. By adjusting the time at which the projected light is reflected or not reflected by this fine mirror, a person can see the brightness corresponding to the accumulated time, so that the brightness / darkness of each pixel of the screen can be expressed.

There are two types of single plate type and three plate type, and in the case of single plate type, there is a disc 21 having R, G, B filters mounted between the light source 20 and the micromirror 22. At the timing of each of R, G, and B, the device processes the image corresponding to each of R, G, and B, thereby producing the effect of a three-color light source. In the single plate type, R, G, and B are divided in time on the time axis so that the light efficiency is reduced. The three-plate type is also excellent in light efficiency because it separates the light of R, G, and B from one light source and provides the light to each device in charge of three colors.

However, the projection TV according to the prior art as described above, the color reproduction characteristics depend on the segment configuration of the color disc that reproduces the RGB color by transmitting the light source from the lamp, and basically R, G, B, which is the three primary colors of light. The additional color is created by the signal combination of R, G, and B. In addition, since the input light is fixed in realizing the image, the brightness and color signals are distinguished by adjusting the on / off time of the DMD chip in synchronization with the R, G, and B signals transmitted by the signal processing. Accordingly, there is a problem in that brightness loss and signal degradation by the time corresponding to the off region of the DMD chip are generated.

Therefore, the present invention is to solve the above-mentioned conventional problems, to use the R, G, B color LED element as each light source and to focus the LED light source itself to directly irradiate the DMD chip to implement the image It is an object to provide a color display device of a projection TV.

According to an aspect of the present invention, there is provided a color display apparatus for a projection TV, including: a plurality of LED drivers configured to focus a light source having a unique color emitted from each LED element and irradiate the DMD chip; A DMD controller for controlling output pulses for driving the plurality of LED drivers; It characterized in that it comprises a DMD chip for implementing a predetermined color image as a light source irradiated from the LED driver.

The plurality of LED drivers include: a first LED driver 110 using an LED device of R color as a light source; A second LED driver 120 having a G color LED element as a light source; And a third LED driver 130 using the LED element of B color as a light source.

The DMD controller drives the first to third LED drivers simultaneously or respectively. In particular, the DMD controller configures a color in which two or more colors are overlapped by simultaneously driving at least two or more specific driving units of the first to third LED driving units.

The LED driver may include a regulator that receives power from an SMPS and adjusts an output voltage of the LED device; It is preferable to include a current control circuit for detecting the current of the LED element and fed back to the regulator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 are block diagrams showing a color display device of a projection TV according to the present invention.

As shown, the present invention is composed of the DMD controller 100, the first LED driver 110, the second LED driver 120, the third LED driver 130 and the DMD chip 140.

The first to third LED drivers 110 to 130 focus a light source having a unique color emitted from each LED device and irradiate the DMD chip.

Herein, the first LED driver 110 uses the LED device of R color as the light source, the second LED driver 120 uses the LED device of the G color as the light source, and the third LED driver 130 uses the LED device of the B color as the light source. It is done.

The DMD chip 140 implements a predetermined color image with a light source irradiated from the first to third LED drivers 110 to 130.

The DMD controller 100 controls output pulses for driving the plurality of LED drivers. The DMD controller 100 simultaneously or individually drives the first to third LED drivers 110 to 130, and simultaneously drives at least two or more specific drivers of the first to third LED drivers 110 to 130 at the same time. It constitutes a color in which abnormalities are duplicated.

5 is a circuit diagram illustrating an LED driver according to the present invention, and FIG. 6 is a view for explaining a color implementation method according to driving pulse adjustment of the present invention.

As shown, the LED driver 110-130 of the present invention receives a power supply from the SMPS (111) regulator 113 for adjusting the output voltage of the LED element 114; And a current control circuit 115 for detecting a current of the LED element 114 and feeding it back to the regulator 113.

Referring to the operation of the present invention configured in this way in more detail as follows.

The present invention uses the LED elements of R, G, B colors as the respective light sources, and focuses the LED light sources themselves to implement the image by directly irradiating the DMD chip.

To this end, first, as shown in FIGS. 3 and 4,

The first to third LED drivers 110 to 130 focus a light source having a unique color emitted from each LED device and irradiate the DMD chip. In this case, the first LED driver 110 uses a LED device of R color as a light source, the second LED driver 120 uses a LED device of G color as a light source, and the third LED driver 130 uses a LED device of B color as a light source. It is done.

In addition, the DMD controller 100 controls output pulses for driving the plurality of LED drivers. The DMD controller 100 simultaneously or individually drives the first to third LED drivers 110 to 130.

Accordingly, the DMD chip 140 implements a predetermined color image with a light source irradiated from the first to third LED drivers 110 to 130.

On the other hand, as shown in Figure 5, the LED driver 110-130 of the present invention, the regulator 113 supplied with power from the SMPS (111) adjusts the output voltage of the LED element 114, the current The control circuit 115 detects a current of the LED element 114 and feeds it back to the regulator 113.

Through this action, brightness loss and signal distortion can be compensated.

In addition, as illustrated in FIG. 6, the DMD control unit 100 simultaneously drives at least two or more specific driving units among the first to third LED driving units 110 to 130 to form a color in which two or more colors are overlapped.

With this configuration, the required color frame can be added only by adjusting the driving pulse for driving the R, G, and B LEDs, and thus, the target value of the color coordinates can be easily moved or the color can be expanded. That is, color gamut of color representation is possible and movement to a desired color coordinate is also very easy.

As described above, the color display device of the projection TV according to the present invention is not only a CRT type projection TV and an upgraded high temperature poly LCD, but also a MD (Micro Display) projection TV based on semiconductor technologies such as DLP and LCoS, and the like. It can be applied to various video devices and can be equally applied to analog TV, digital TV, and satellite TV. In addition, it can of course be applied to all NTSC, PAL, SECAM method.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can, of course, make various changes and make such changes as fall within the stated claims.

As described above, according to the color display device of the projection TV according to the present invention, by using the LED elements of the R, G, B color as a light source, there is no need for a color original to make the conventional color, and focuses the LED light source itself DMD The image is realized by directly irradiating the chip, and in the signal processing method, each R, G, B LED driver can be driven at the same time, thereby adding a frame area according to the driving logic of R, G, and B. It is possible to improve the depth of color by constructing frame areas such as magenta, shiyan, and yellow separately, and it is possible to expand the full range of color expression by compensating for brightness loss and signal distortion by using DMD chip. Moving to color coordinates also has a very easy effect.

Claims (5)

A plurality of LED drivers configured to focus a light source of a unique color emitted from each LED element and to irradiate the DMD chip; A DMD controller for controlling output pulses for driving the plurality of LED drivers; And a DMD chip for realizing a predetermined color image by the light source irradiated from the LED driver. The method of claim 1, The plurality of LED driving unit A first LED driver 110 using the LED device of R color as a light source; A second LED driver 120 having a G color LED element as a light source; And a third LED driver (130) using the LED element of B color as a light source. The method of claim 1, The DMD control unit And driving the first to third LED drivers simultaneously or respectively. The method of claim 3, The DMD control unit And at least two or more specific driving units of the first to third LED driving units at the same time to form a color in which two or more colors are overlapped. The method of claim 1, The LED driver A regulator that receives power from an SMPS and adjusts an output voltage of the LED device; And a current control circuit which detects a current of the LED element and feeds it back to the regulator.

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