KR0174948B1 - Driving apparatus for use in an optical projection system using an actuated mirror array - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device of a projection type image display apparatus using an actuated mirror array, and includes a Y / C separation unit 10, an RGB separation unit 20, an analog-to-digital conversion unit 30, and a gamma (τ). Correction unit 40, frame memory 50, synchronization signal (SYNC) separation unit 60, PLL / timing control unit 60, digital analog converter 80, column driver 90, row ( row) includes a drive unit 100, an actuated mirror array 110, a color wheel drive unit 120, a color wheel drive motor 130, a color wheel 140, It is possible to configure the driving device of the projection image display device using only one AMA panel.

Description

Driving device for projection type image display device using actuated mirror array

1 is a block diagram showing a driving apparatus of a projection image display apparatus using an actuated mirror array according to the present invention.

2 is a view showing the structure of a color wheel used in the present invention.

* Explanation of symbols for main parts of the drawings

10: Y / C separation part 20: R.G.B separation part

30: analog-digital conversion unit 40: gamma correction unit

50: frame memory 60: synchronization signal separation unit

70: PLL / Timing Control Unit 80: Digital-to-Analog Converter

90: column driving unit 100: furnace driving unit

110: actuated mirror array 120: color wheel drive unit

130: color wheel drive motor 140: color wheel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type image display apparatus using an actuated mirror array (hereinafter abbreviated as AMA), and in particular, it is possible to display a video signal using only one AMA panel. The driving apparatus of the projection type image display apparatus using AMA.

In general, an image display device is classified into a direct view display device and a projection display device according to a display method.

The direct view type image display apparatus includes a cathode ray tube (hereinafter referred to as a CRT), and the CRT is an excellent device in image variability, high speed, and fineness. However, due to its structure, the length of the cathode ray is longer than that of the display surface, and it is difficult to reduce size and weight. In addition, there are limitations to low voltage and low power, and these drawbacks make it difficult to embed the CRT in some of the other electronic devices.

Meanwhile, as an information display device in the digital age, the importance of displaying an image without deformation on the screen is increasing. To this end, various flat display devices such as an EL (elcetroluminescent) display or a plasma display have been examined in order to planarize the display surface and to correct the horizontal and vertical coordinates.

However, the flat panel display described above has a problem in compatibility with the C-MOS transistor because of high power consumption and high voltage required for driving, and has a limitation in miniaturization of the entire display unit.

Projection type image display devices include a large crystal display (Liquid Crystal Display: hereinafter referred to as "LCD"), and the like. Such a large screen LCD can be thinned and the weight can be reduced. However, such an LCD has a high light loss due to a polarizing plate, and thin film transistors for driving the LCD are formed for each pixel, so that there is a limit in increasing the aperture ratio (light transmission area).

Therefore, a projection type image display apparatus using an actuated mirror array (hereinafter abbreviated as AMA) has been developed by Aura, United States.

Among many existing video display systems, a projection image display device using AMA is known to provide a high quality video display on a large scale.

On the other hand, the 'projection type image display apparatus using the AMA is divided into using a one-dimensional AMA and a two-dimensional AMA.

In the one-dimensional AMA, mirror surfaces are arranged in an M × 1 array. Therefore, the projection image display device using the one-dimensional AMA pre-scans the M × 1 beams using the scanning mirror, and the projection image display device using the two-dimensional AMA projects the M × N beams to array the M × N pixels. Display an image with

In a projection image display device using such an AMA, the light projected from a lamp is uniformly illuminated, for example, on an M × N actuated mirror array, where each future is associated with a respective actuator. It is.

The actuators may also be made of electrodisplacive material, such as piezoelectric or electrostrictive, that deforms in response to an applied electric field.

The light reflected from each mirror is projected to the aperture of the baffle. By applying an electrical signal to each actuator, the relative position of each mirror on which the light beam is projected is changed, thereby changing the light path of the light reflected from each mirror.

When the light path of each reflected light is changed, the amount of light reflected from each mirror and passing through the opening is changed, so that the intensity of the light is adjusted accordingly. Light whose light amount is adjusted through the aperture is transmitted to a projection screen through an appropriate optical device such as a projection lens to display an image.

In addition, in the driving apparatus of the projection type image display apparatus using the general AMA, in processing the color signals R, G, and B according to the driving of the AMA, R, G in white light, such as a dichroic filter, etc. A color separation filter to separate the color of B, and three AMA panels for R, G and B were used.

The present invention is intended to implement a driving device for a projection image display device using an AMA using only one AMA panel, which is composed of three sheets, in the driving device for a projection image display device using a conventional AMA. SUMMARY OF THE INVENTION An object of the present invention is to provide a driving device of a projection type image display device using AMA, which enables a video signal to be displayed using only an AMA panel.

According to a preferred embodiment of the present invention for achieving this object, in a driving apparatus for driving a projection type image display apparatus using an actuated mirror array (AMA), the AMA is provided in one AMA panel. Y / C separation unit for separating and outputting the input image signal into a feed signal (Y) and a color signal (C), and the output signal of the Y / C separation unit to receive the red, green 8 bits each of the R, G, B separation unit for separating and outputting the green, blue R, G, and B signals, and the R, G, B signals provided from the R, G, and B separation units An analog-to-digital converter for quantizing and outputting the digital signal, and each of the 8-bit digital signals provided from the analog-to-digital converter is determined according to the characteristics of the AMA to prestored gamma correction data. Gamma Correction Unit for Gamma Correction By using the input image signal, the vertical synchronization signal (V-SYNC), horizontal synchronization signal (H-SYNC), color synchronization signal (C-SYNC) and the odd / even (odd / even) signal to output A sync signal separator and the vertical sync signal V-SYNC, a horizontal sync signal H-SYNC, a color sync signal C-SYNC, and odd / even provided from the sync signal separator. A PLL / timing control unit that generates each timing control signal using a signal, and the 8-bit data of each of gamma-corrected R, G, and B provided from the gamma correction unit is provided from the PLL / timing control unit. A frame memory for storing in units of fields according to a control signal, and sequentially outputting R, G, and B signals in units of fields according to a read control signal provided from the PLL / timing control unit; Line the R, G, B field data provided from memory Digital-to-analog converter for analog conversion to 400 field data in units of) and the AMA according to the timing signal provided from the PLL / timing controller to the field data provided for the line unit provided from the digital-analog converter. A column driver for providing a column of the column driver, a row driver for transmitting an output signal of the column driver to the AMA according to a row control signal provided from the PLL / timing controller, and the synchronization signal separator A color wheel driver for generating a drive control signal according to a vertical synchronization signal provided; and a color wheel driver that rotates according to the drive control signal provided from the color wheel driver, and provides PG and FG signals to the color wheel driver each time the rotation is performed. A color wheel driving motor for causing the color wheel driving unit to generate a driving control signal according to the above; In combination with the la-wheel drive motor, the color wheel is rotated equally when the motor rotates. The circular wheel is divided into equal parts. In each equal part, the color wheel is equipped with three color filters of the same size as R, G, and B. Include.

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

1 is a block diagram showing a driving apparatus of a projection type image display apparatus using an actuated mirror array according to a preferred embodiment of the present invention.

As shown in FIG. 1, the present invention includes a Y / C separation unit 10, an R, G, and B separation unit 20, an analog-to-digital conversion unit 30, and a gamma (τ) correction unit 40. Frame memory 50, synchronization signal (SYNC) separation unit 60, PLL / timing control unit 60, digital-analog converter 80, column driver 90, row driver ( 100), an actuated mirror array 100, a color wheel driver 120, a color wheel driving motor 130, and a color wheel 140 are configured.

The Y / C separator 10 separates an input video signal into a luminance signal (Y) and a color signal (C). In this case, as a separation method, a comb filter may be used, or a 1H (horizontal sync interval) delay line method or a 2H delay line method may be used.

The Y / C separation unit 10 separates the luminance signal and the color signal through these means or methods and outputs them to the R, G, and B separation units 20.

Then, the R, G, B separation unit re-creates the output signal of the Y / C separation unit 10 as three color signals of red, green, and blue, that is, R, G, and B colors. Separated and output to the analog-to-digital converter (30).

On the other hand, the sync signal separator 60 inputs the input video signal to the vertical sync signal V-SYNC, the horizontal sync signal V-SYNC, the color sync signal C-SYNC, and the odd / even field. The output signal is separated into an odd / even signal according to the PLL / timing control unit 70. Then, the PLL / timing control unit 70 hangs the PLL using the output signal of the synchronization signal separation unit 60, and various timing control signals, for example, a write control signal, a read control signal, and a column. The control signal, the raw control signal, and the data conversion clock signals D / A and A / D CLK are generated.

In addition, the analog-to-digital converter 30 receives the R, G, B signals provided separately from the R, G, and B separation units 20, and the data conversion clock signals A provided from the PLL / timing control unit 70. / D CLK) to quantize each of the 8-bit digital signal to the gamma correction unit 40, where the sampling frequency for quantization is A / D CLK frequency.

The gamma correction unit 40 gamma corrects the quantized 8-bit signal provided from the analog-to-digital converter 30 and outputs the gamma correction unit to the frame memory 50. In this case, for gamma correction, The gamma correction data, which is pre-determined according to the characteristics, is output in a look-up table method.

The frame memory 50 stores R, G and B data of 8 bits, respectively, provided by gamma correction by the gamma correction unit 40 in units of fields according to the write control signal provided from the PLL / timing control unit 70. The B, signals are stored in parallel, and 8-bit R, G, and B signals are sequentially output in units of fields according to the read control signal. This output signal is provided to the digital-analog converter 80.

The digital-analog converter 80 digitally-analog converts the R, G, and B field data provided from the frame memory 50 into 400 data in a line unit and outputs the converted data to the column driver 90.

Then, the column driver 90 transmits the line data provided from the digital-to-analog converter 80 to the AMA 110 according to a timing control signal provided from the PLL / timing controller 70, that is, the column control signal. Transfer to column of.

In addition, the furnace driver 100 switches the column side signal to the AMA according to a timing control signal provided from the PLL / timing controller 70, that is, a furnace control signal. row) to control on / off. On the other hand, the raw control signal is generated by V-SYNC and H-SYNC.

The color wheel driver 120 generates a drive signal for driving the color wheel drive motor 130 using the V-SYNC signal provided from the synchronous separation unit 60, and accordingly, the color wheel drive motor 130 is driven. do. In addition, five V-SYNCs are output when the color wheel driving motor 130 rotates once, and the color wheel driving motor 130 is made using the FG signal and the PG signal generated while the color wheel driving motor 130 rotates. To control the phase and speed of), use the FG signal to control the speed so that it can rotate at a constant speed, and use the PG signal to have a constant phase compared to the fifth V-SYNC.

In addition, the color wheel driving motor 130 rotates according to the driving control signal of the color wheel driving unit 120, and generates a PG signal and an FG signal at each rotation, which are provided to the color wheel driving unit 130 as described above. do.

The color wheel 140 is combined with the color wheel driving motor 130 to rotate as the motor 130 rotates, the structure of which is as shown in FIG.

As shown in FIG. 2, the color wheel 140 used in the present invention is circular and divided into 5 equal parts. Further, in each equal portion, color filters of R, G, and B having the same area and the same shape are respectively attached.

The color wheel 140 configured as described above separates the white light provided from the outside into R, G, and B so as to be provided to the AMA 110, respectively.

Therefore, the present invention has the effect that the driving device of the projection image display apparatus can be constituted by only one AMA panel.

While the invention has been shown and described with reference to certain preferred embodiments, those skilled in the art will recognize that various modifications and changes can occur without departing from the spirit and scope of the invention as set forth in the following claims.

Claims (3)

A driving apparatus for driving a projection type image display apparatus using an actuated mirror array (AMA 110), wherein the AMA 110 is mounted on one AMA panel and inputs an image signal. A Y / C separator 10 for separating and outputting the signal into a luminance signal Y and a color signal C; R, G, B separation unit 20 for receiving the output signal of the Y / C separation unit 10 to separate the R, G, B signal of the red, green, blue signal )Wow; An analog-to-digital converter (30) for quantizing and outputting the R, G, and B signals provided from the R, G, and B separation units (20) into 8-bit digital signals, respectively; A gamma correction unit 40 which gamma corrects each of the 8-bit digital signals provided from the analog-digital converter 30 according to the characteristics of the AMA 110 and is pre-stored for gamma (τ) adjustment data. )Wow; By using the input image signal, a vertical synchronization signal V-SYNC, a horizontal synchronization signal H-SYNC, a color synchronization signal S-SYNC, and an odd / even signal are separately outputted. A synchronization signal separation unit 60; The vertical synchronizing signal V-SYNC, the horizontal synchronizing signal H-SYNC, the color synchronizing signal S-SYNC, and the odd / even signal provided from the synchronizing signal separation unit 60 are provided. A PLL / timing control section 70 for generating respective timing control signals using the PLL / timing control section 70; The gamma corrected R, G, B and 8-bit data provided from the gamma corrector 40 are field-based in accordance with a write control signal provided from the PLL / timing controller 70. A frame memory 50 which sequentially stores R, G, and B signals in units of fields according to a read control signal provided from the PLL / timing controller 70; A digital-to-analog converter 80 for analog-converting the R, G, and B field data provided from the frame memory 50 into 400 field data in a line unit; A column driver 90 for providing the line data provided from the digital-analog converter 80 to the column of the AMA according to a timing control signal provided from the PLL / timing controller 70. Wow; A row driver 100 for transmitting an output signal of the column driver 90 to the AMA 110 according to a row control signal provided from the PLL / timing controller 70; A color wheel driver 120 for generating a driving control signal according to the vertical synchronization signal provided from the synchronization signal separation unit 60; Rotate according to the driving control signal provided from the color wheel driving unit 120, and provide the PG and FG signals to the color wheel driving unit so that the color wheel driving unit 120 generates the driving control signal accordingly. A color wheel driving motor 130; And a color wheel (140) which is coupled to the color wheel driving motor (130) to rotate and drive the same when the color wheel driving motor (130) is rotated. The look-up table of claim 1, wherein the gamma correction unit 40 stores the quantized 8-bit signal provided from the analog-to-digital converter 30 according to the characteristics of the AMA 110. A drive device for a projection type image display device using an actuated mirror array, characterized in that gamma correction is performed according to a look-up table. 2. The actuated mirror according to claim 1, wherein the color wheel 140 has an elongated circular structure, and three color filters having the same size R, G, and B are mounted in each equal portion. A drive device for a projection image display device using an array.