KR0173715B1 - Horizontal pixel driver of projector having actuated mirror array panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pixel driving circuit of a projection image display device, comprising: an AMA panel 10 equipped with AMA elements for driving a plurality of pixels, and an odd field for pixels in the vertical and horizontal directions of the AMA panel 10; And the horizontal driving means 40 of the AMA panel 10 in the horizontal direction of the AMA panel 10 in the projection type image display device having vertical and horizontal driving means 30 and 40 driven by dividing into even fields. The pixel is composed of a single unit which alternately drives the pixel based on the field designation signal (O / E ') for designating the odd field and the even field, and the horizontal driving means 40 is a field unit of the odd field or the even field. A shift register 50 for storing the pixel data inputted into the data and horizontal pixel data of the odd or even field read out from the shift register 50 based on the field designation signal O / E '. Multiple outputs The field specifying signal (O / E) is applied to the logic output gate (70), the switching output means (70) for selectively switching the output of each logic AND gate (60), and the pixel data output from the switching output means (70). ') Is synchronously outputted to the horizontal drive element 80 to perform the horizontal drive of the AMA panel 10 is configured.

Description

Pixel driver circuit of projection image display device

1 is a view for explaining a pixel driving method of a projection image display apparatus according to a conventional example.

2 is a diagram showing a pixel driving circuit of a projection image display apparatus according to a preferred embodiment of the present invention.

FIG. 3 is a circuit diagram showing an example of the configuration of the horizontal driving means in the pixel driving circuit of the projection image display apparatus shown in FIG.

4 is a timing chart for explaining a pixel driving circuit of the projection image display apparatus according to the present invention.

5 is a view showing a modification of the horizontal drive means shown in FIG.

* Explanation of symbols for main parts of the drawings

10: AMA panel 20a, 20b: first and second horizontal drive unit

30a, 30b: first and second vertical driving part

40: horizontal drive unit 50: shift register

60: AND gate 70: multiplexer

80: horizontal drive element

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pixel driving circuit of a projection image display device, and more particularly, to apply a single horizontal driving means to horizontal driving of an AMA panel equipped with an AMA (Actuated mirror array) device corresponding to the number of pixels. A pixel drive circuit of a projection type image display apparatus is provided.

According to the CRT apparatus known as a conventional direct view type image display apparatus, the flow distance of the electron beam generated from the R / G / B electron gun is required to correspond to the color component of the pixel, making it difficult to reduce the size and weight of the liquid crystal, and to uniformly arrange the liquid crystal. In the LCD device which displays an image using a state in which the arrangement of liquid crystals is scattered by the color components of the pixels, the light and small size can be reduced, but the light efficiency is low.

In view of such a point, in recent years, the white light generated from the light source is spectroscopically R / G / B color component, and each R / G / B color component is adjusted to the optical path corresponding to the color component of the pixel of the corresponding image signal. A projection image display device for realizing color images on a screen has been proposed. As the optical path control means, an AMA panel in which a large number of AMA elements are integrated on an active matrix substrate is adopted.

Here, according to the AMA panel, a MOS transistor as a pixel driving element integrated in a state corresponding to the total number of pixels constituting one screen on a single active matrix substrate is integrated, and the signal corresponding to the pixel driving element is integrated. An AMA element is formed in which a tilting angle is varied depending on a signal of a color component applied to the pixel driver.

In general, according to the AMA panel, white light generated from a light source when realizing a color image is separated into R / G / B color components in an R / G / B color separation means composed of, for example, an R / G / B dichroic filter. Is incident on the corresponding R / G / B color AMA panel, the AMA element constituting the AMA panel is the R / G / B color signal of the original image signal applied to the corresponding pixel driver (i.e., MOS transistor). The inclination is controlled by the light source, and accordingly the R / G / B color light is separated from the R / G / B color separation means, and the light path is adjusted in the corresponding R / G / B color AMA panel. By synthesizing on the screen via the media, a color screen is implemented on the screen.

Here, according to the driving of the AMA elements formed on the AMA panel, for example, when the number of pixels constituting the screen is 480 x 640, the pixel driving elements for driving the AMA elements provided on the AMA panel are driven in the horizontal and vertical directions. The configuration of the horizontal / vertical driving circuits is very complicated.

Therefore, a method of performing horizontal and vertical driving by dividing the pixel of the odd field and the pixel of the even field for all the pixels for driving the pixel is adopted. FIG. 1 is a projection image according to the conventional example. It is a figure explaining the pixel drive method of a display apparatus.

That is, in FIG. 1, reference numeral 10 denotes an R / G / B color signal on which a pixel driver corresponding to an entire pixel is collected on a single active matrix substrate and driven and applied correspondingly by the pixel driver. The AMA panel is provided with a plurality of AMA elements for controlling the optical path of the incident light.

In FIG. 1, reference numerals 20a and 20b denote a radix field in the horizontal direction of a plurality of AMA elements provided in the AMA panel 10, for example, when the screen size is composed of 480 (horizontal) x 640 (vertical) pixels. The first and second horizontal driving portions for dividing the pixels (1,3, ---, 479) and the pixels (2,4, ---, 480) of the even field to drive the pixels. And the second horizontal driver 20a, 20b includes data (DI / O) for driving pixels in odd and even fields under control of the control means, a clock signal (CLK) for specifying a horizontal direction of the pixel, and a first thereof. And control signals oe1 and oe2 for controlling the activation states of the second horizontal driving units 20a and 20b.

Reference numerals 30a and 30b denote pixels (1, 3,-) in the radix field of a plurality of AMA elements provided in the AMA panel 10 in the vertical direction when the screen size is 480 (horizontal) x 640 (vertical). 639) and first and second vertical driving portions for dividing driving into pixels (2,4, --- 640) of the even field, wherein the first and second vertical portions are digital-analog converted. The image signal is applied.

In the pixel driving method of the projection type image display apparatus according to the conventional example of such a configuration, the first horizontal driving circuit 20a is used in the pixel driving period of the odd field under the control of a control means (not shown) for driving the pixels constituting the screen. Data DI / O, clock signal CLK, and control signal oe1 are applied to the digital signal, and a digital-analog converted image signal is applied to the first vertical driving circuit 30a. Driving of the odd field pixels in the direction is performed.

Subsequently, in the pixel driving period of the even field under the control of the control means, the data DI / O, the clock signal CLK, and the control signal oe2 are applied to the second horizontal driving unit 20b and the second vertical driving circuit is performed. The digital-analog converted image signal is applied to the furnace 30b, thereby driving the even field pixels in the horizontal and vertical directions.

However, according to the pixel driving method in the horizontal and vertical directions shown in FIG. 1, driving is performed by dividing the whole pixels into odd and even fields in the horizontal and vertical directions so that the entire pixel is driven in a single pixel driving period. Compared to the driving method, although the control structure is simplified and efficient, a set of horizontal driving units 20a and 20b are still required for driving the odd and even field pixels in the horizontal direction. The control procedure for the horizontal drive of the hardware or the configuration of the hardware for the horizontal drive for the AMA panel 10 is not simplified.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the driving of the odd and even fields for a plurality of pixel driving elements provided in the AMA panel is realized by a single horizontal driving means, thereby greatly driving the horizontal direction of the pixels. It is an object of the present invention to provide a pixel driving circuit of a projection type image display device which is simplified.

In order to achieve the above object, according to a preferred embodiment of the present invention, an AMA panel equipped with AMA elements for driving a plurality of pixels, and divided into odd and even fields for pixels in the vertical and horizontal directions of the AMA panel. A projection type image display device having vertical and horizontal driving means for driving a frame, wherein the horizontal driving means of the AMA panel is configured based on control signals for designating the odd and even fields of pixels arranged in the horizontal direction of the AMA panel. The horizontal driving means includes a shift register for storing pixel data input in units of fields of the radix field or even field, and the horizontal direction of the radix field or even field read out from the shift register. Multiple fields for selectively outputting pixel data based on the field designation signal for designating the odd field / excellent field A switching output means for selectively switching and outputting an AND gate, an output of each logical AND gate, and a horizontal drive for horizontally driving the AMA panel by synchronously outputting pixel data output from the switching output means to the field designation signal A pixel driving circuit of a projection type image display device provided with elements is provided.

Preferably, the horizontal driving element is provided with a number corresponding to the pixels of the odd field / excellent field, driving the gate to which the field designation signal is applied, the source to which the pixel data of the odd field is applied, and the pixel data to drive the odd field pixels. A first conductive CMOS transistor having a drain output as a signal, and a gate to which the field designation signal is applied, a source to which the even field pixel data is applied, and the pixel data are superior to the first conductive CMOS transistor. A second conductive CMOS having a drain outputted as a field pixel drive signal is preferably used. Preferably, the first CMOS transistor is an N-channel CMOS transistor, and the second CMOS transistor is a P-channel CMOS transistor.

The horizontal drive element has a first AND gate to which pixel data of the odd field is input at one end and an odd field designation level of the field designation signal is applied at one end thereof, and pixel data of the even field is input at one end thereof and to the other end thereof. The second AND gate is connected to an inverter which inverts the level of the field designation signal to form an odd field designation signal.

According to the pixel driving circuit of the projection type image display apparatus according to the present invention having the above-described configuration, a single horizontal driving means is provided for a horizontal pixel provided in an AMA panel and pixel data is applied to the horizontal driving means in units of fields. In addition, since the driving of the pixels in the horizontal direction is performed by applying the field designation signal, the configuration of the horizontal driving means of the AMA panel is simplified.

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

2 is a view showing a pixel driving circuit of a projection image display apparatus according to the present invention, in which the same reference numerals are denoted for the same parts as the components shown in FIG. An AMA panel having an AMA element corresponding to a pixel is shown, and 30a and 30b are the first and second vertical lines for driving a vertical AMA element (pixel) of the AMA panel 10 into odd and even fields. 40 represents a drive unit, and 40 represents a single horizontal drive unit designed to drive the horizontal AMA elements (pixels) of the AMA panel 10 assumed in the present invention in field units.

3 is a diagram showing an example of the configuration of the single horizontal drive unit 40. The horizontal drive unit 40 is a field unit of radix field or even field (1,3, ---, 479: 2,4,-). A shift register 50 for storing pixel data input to the 480, and horizontal pixel data row1; row2, ---, of the odd field or even field read out from the shift register 50; row479; row480) is input at each end, and at the other end, a field designation signal (O / E ') for designating the radix field / excellent field is applied to the radix field or even based on the field designation signal (O / E'). A plurality of logical AND gates 60 for selectively outputting pixel data of a field, a multiplexer 70 as switching output means for switching output of each logical AND gate 60 in units of fields, and the multiplexer 70 Outputs the pixel data in the unit of the field synchronously to the field designation signal (O / E ') The AMA panel 10 is provided with a horizontal driving device 80 that performs horizontal driving.

Here, the horizontal drive element 80 is preferably provided with a number corresponding to the pixels (1,3, ---, 479; 2,4, ---, 480) of the odd field / excellent field, the representative horizontal According to the driving device 80, a first source having a gate to which the field designation signal O / E 'is applied, a source to which pixel data of the odd field is applied, and a drain to output the pixel data as an odd field pixel driving signal A source to which the field specifying signal O / E 'is applied and the source to which the even field pixel data is applied while inversely interacting with the conductive (N-channel) CMOS transistor 82 and the first conductive CMOS transistor 82. And a second conductive (P-channel) CMOS transistor 84 having a drain by outputting the pixel data as an even field pixel drive signal.

In addition, in FIG. 2, reference numerals 12 and 14 denote pixel driving elements provided in the active matrix substrate of the AMA panel 10, and the pixel driving elements 12 have a gate of which the drain side of the first CMOS transistor 82 is formed. And a P-channel MOS transistor connected to the source side and vertically applied an image signal in the vertical direction from the first vertical driver 30a to the pixel side, and having an AMA element 16 connected to the drain side thereof. The element 14 has a gate connected to the drain side of the second CMOS transistor 84, and an image signal in the vertical direction is applied to the source side corresponding to the pixel on the source side of the second CMOS transistor 84, and an AMA element on the drain side thereof. 18 is composed of a connected P-channel MOS transistor.

Next, the operation of the pixel driver circuit of the projection image display apparatus of the above-described configuration will be described with reference to the timing chart shown in FIG.

First, an image signal processed and digitally-analog-converted by the image processing means is applied to the first and second vertical driving units 30a and 30b, and a field designation signal (O / E ') for designating the odd field and the even field. 4 (a) is applied and a clock signal CLK (see FIG. 4 (b)) and pixel data (DI / O; FIG. 4 (c)) are applied to the horizontal driver 40. In the shift register 50 of the horizontal driver 40, the pixel data of the radix field (1,3, ---, 479; 4 (d), ---, (f) in the radix field period is referred to. ) Is temporarily stored in synchronization with the clock signal CLK and is output correspondingly to each end of the AND gate 60. Therefore, in the AND gate 60, when the field designation signal O / E 'applied to the other end is high level (i.e., the odd field period), the odd field output from the shift register 50 is the pixel data (1). , 3, ---, 479 is ANDed and applied to the multiplexer 70, and the pixel data (1,3, ---, 479) of the radix field switched from the multiplexer 70 is output. Are applied to the source sides of the first and second CMOS transistors 82,84. Here, the first and second CMOS transistors 82 and 84 are activated and controlled by the field designation signal O / E ', and the first CMOS transistor 82 is activated during the pixel driving period of the odd field. Pixel data of the odd field applied to the source side is applied to the P-channel MOS transistor 12 of the AMA panel 10. Accordingly, the AMA element 16 of the radix field to be driven by the first vertical driving unit 30a is driven to perform the optical path control function.

In contrast, when the field designation signal O / E 'is converted to a level specifying the even field, pixel data of the even field stored in the shift register 50 causes the AND gate 60 and the multiplexer 70 to operate. The second and second CMOS transistors 82 and 84 are applied to the first and second CMOS transistors. In the pixel driving period of the even field, the second CMOS transistor 84 is activated, thereby driving the P-channel MOS transistor 14 for driving the even field. The AMA element 18 connected to the P-channel MOS transistor 14 is driven to perform the optical path control action.

Therefore, the optical path of the light incident on the AMA panel 10 is adjusted by driving the entire pixels provided in the AMA panel 10 in units of odd and even fields.

5 is a view showing a modification of the horizontal drive device 80 shown in FIG. 4, wherein the horizontal drive device 80 of FIG. 4 is a CMOS transistor 82 of the first conductive type and the second conductive type that interact with each other. 84, the horizontal drive element shown in FIG. 5 has a first AND gate 86 to which pixel data of the odd and even fields are applied at one end and a field designation signal for specifying the odd field is applied at the other end. And the second AND gate 88 to which pixel data of the odd field and even field is applied at one end and an inverter 88 which forms a level for designating the even field at the other end.

Accordingly, in the horizontal driving device 80 shown in FIG. 5, the high level radix field designation signal O / E 'is applied when the pixel data of the radix field is applied to one end of the first and second AND gates 86 and 100. FIG. Is applied at the high level, the pixel data of the odd field is output from the first AND gate 84, while the signal O / E 'for designating the even field is set to the low level by the inverting action of the inverter 88. The pixel data of the even field is output from the second AND gate 100.

In addition, the above-described configuration of the present invention is not limited to the embodiments, but may be variously modified and changed within the scope not departing from the gist of the invention.

As described above, according to the pixel driving circuit of the projection image display apparatus according to the present invention, a single horizontal driving means is provided for the horizontal pixels provided in the AMA panel and pixel data is applied to the horizontal driving means in units of fields. In addition, since the driving of the pixels in the horizontal direction is performed by applying the field designation signal, not only the hardware configuration of the driving means for driving the pixels in the horizontal direction of the AMA panel is simplified but also the control procedure is simplified.

Claims (3)

AMA panel 10 equipped with AMA elements for driving a plurality of pixels, and vertical and horizontal driving means 30 for dividing and driving the odd and even fields for pixels in the vertical and horizontal directions of the AMA panel 10. In the projection type image display device provided with (40), the horizontal driving means (40) of the AMA panel (10) is a field for designating the odd and even fields of pixels arranged in the horizontal direction of the AMA panel (10). The shift driving unit 50 is constituted by a single unit that alternately drives based on the designated signal O / E ', and the horizontal driving unit 40 stores pixel data input in units of odd or even fields. And a plurality of logic AND gates 60 for selectively outputting horizontal pixel data of the odd field or even field read out from the shift register 50 based on the field designation signal O / E '. Selectively output the output of each logical AND gate 60 Switching output means 70 for switching output and pixel data outputted from the switching output means 70 are synchronized with the field designation signal O / E 'to perform horizontal driving of the AMA panel 10. And a horizontal driving device (80). 2. The horizontal driving device (80) according to claim 1, wherein the horizontal drive element (80) is provided with a number corresponding to pixels in the odd field / excellent field, so that the gate to which the field designation signal (O / E ') is applied and the pixel data of the odd field are The field designating signal O / O is inversely acting on the first conductive CMOS transistor 82 having a source applied thereto and a drain for outputting the pixel data as an odd-field pixel driving signal, and the first conductive CMOS transistor 82. And a second conductive CMOS transistor (84) having a gate to which E ') is applied, a source to which the even field pixel data is applied, and a drain for outputting the pixel data as an even field pixel drive signal. Pixel driver circuit of display device. 3. The horizontal driving device (80) according to claim 1 or 2, wherein the horizontal driving element (80) is inputted with pixel data of the radix field at one end and the radix field designation level of the field designation bin (O / E ') at the other end. A second AND connected to one AND gate 86 and one end of the pixel data of the even field and an inverter 88 connected to the other end to invert the level of the field designation signal O / E 'to form an odd field designation signal. A pixel driving circuit of a projection type image display apparatus, characterized by comprising a gate (100).