KR19980023192A - Panorama (PANORAMA) screen converter of projection image display system - Google Patents

Abstract

The present invention relates to a panorama screen converting apparatus of a projection type image display system, wherein a clock cycle is supplied in a predetermined variable period for each image scanning period (H) of an input image signal (Vin). Data conversion means 10 for converting the sampling rate corresponding to the sampling clock pulse to generate a panoramic picture effect, and clocking the image data converted by the data conversion means 10 in predetermined variable period units. Image memory means 12 for recording in synchronization with a recording clock WCK supplied with a variable period, and reading image data synchronously recorded in a read clock RCK supplied with a constant clock period. Data inverse converting means (14) for converting image data read out from the memory means (12) into the form of an analog signal; Image driving means (16) for driving the pixel unit with respect to the received video signal, and image display means for forming a panoramic screen on the screen by performing inclination transformation of the pixel unit through image driving of the image driving means ( 18) a clock pulse having a variable clock period for each of the variable period units divided for each image scanning period H of the video signal Vin is supplied to the data conversion means 10 as a sampling clock pulse. A variable clock generating means for supplying the image memory means 12 as a read clock WCK, a clock pulse having a predetermined clock period, and supplied to the image memory means 12 as a read clock RCK; An output clock generating means 28 for supplying the data inverse converting means 14 as a synchronous clock, horizontal counting means 30 for counting a horizontal synchronous pulse of the video signal Vin, and each video of the video signal Vin. Enabling the write / read operation of the data memory means 32 and the image memory means 12 in which setting data in which a plurality of variable period units are divided for the period H is stored, and the horizontal The timing pulse generator 34 displays a plurality of divided variable period units set by the setting data of the data memory means 32 based on the result of receiving the count value of the horizontal synchronization pulse counted by the counting means 30. Recognizing through the operation, the variable clock generating means is characterized in that it comprises a control means 36 for controlling the clock cycle is variable corresponding to the plurality of divided variable periods.

Description

Panorama Display Converter of Projection Image Display System

The present invention relates to a panoramic screen converting apparatus of a projection image display system, and more particularly, an image scanned as a general screen in a projection image display system which forms an image on a screen by driving an AMA panel having a plurality of AMA elements. A panoramic screen converting apparatus of a projection image display system for converting a signal to be formed on a screen as a panoramic screen.

Recently, a projection type image display system employing an AMA member or device has been proposed, and development for commercial use is in progress. The AMA device is, for example, driven for driving a plurality of pixels provided on a 640 x 480 screen. A plurality of pixel driving elements composed of, for example, MOS transistors corresponding to the number of pixels are formed on an active matrix substrate arranged in a matrix array form, and an image signal provided from each pixel driving element formed corresponding to each pixel on the active matrix substrate. The actuator is inclinedly deformed in accordance with the voltage to modulate incident light (ie, optical path control).

According to a projection type image display system using such an AMA device, the AMA device comprises an active matrix substrate (i.e., an AMA panel) and a plurality of actuators formed on the AMA panel corresponding to the number of pixels reflecting incident light. do.

When the screen of 640 x 480 is assumed inside the AMA panel, for example, a plurality of pixel driving elements arranged in a matrix array form are provided corresponding to the total number of pixels constituting the screen. Therefore, in order to reproduce an image by tilting the actuator corresponding to each pixel driver in response to the image signal voltage, the pixel driver provided in the AMA panel is formed in the form of a matrix array based on the image signal voltage corresponding to each pixel. In order to control the pixel driver, a row / column driver circuit is provided for driving the pixel driver to drive odd pixels and even pixels in the row / column direction of the AMA panel.

In addition, in a projection type image display system employing such an AMA member or device, a multi-channel television broadcast signal received / tuned by an airwave broadcasting receiving / reproducing apparatus such as a television, or video reproduced from a recording medium reproducing apparatus such as a video tape recorder. A video / audio signal recorded on a recording medium such as a tape is introduced to be reproduced as an image on a screen. Among the multiple channels, a video signal of a multichannel television broadcast signal can be simultaneously introduced or a video signal of a television broadcast signal and It is equipped with a multi-screen playback function (PIP (Pictuer-In-Picture) function) that allows video signals from a recording medium to be simultaneously introduced and played back as a multi-screen with main and sub-picture screens. It is equipped with two screen playback function that realizes video signal as two screens on the screen. D. A video signal having a 4: 3 mode is horizontally stretched with a 16: 9 aspect ratio to be implemented on a screen having a 16: 9 screen size, and a 16: 9 mode video signal is processed on a screen. It also has a widescreen playback function to implement.

On the other hand, in a conventional direct-view image display apparatus such as a television having a conventional multi-screen reproduction function or a wide-screen reproduction function, a CRT (Cathode Ray Tube) is provided as an image display means. By adjusting the scanning speed of the image signal scanned from the electron gun by the horizontal deflection adjustment, a panorama screen is realized on the CRT screen, thereby providing a more dynamic and dynamic image.

However, in the case of a projection type image display system employing AMA, since the image light generated by the inclination deformation of a large number of AMAs provided in the AMA panel is taken to be projected on the screen by the projection lens, a normal direct view is required. It is difficult to produce the same panoramic effect as the panoramic screen possible on the CRT screen of the type image display system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and by varying the clock pulses for sampling, image recording (image memory) and image reading of an image signal input from a projection type image display system employing an AMA panel to form an image. It is an object of the present invention to provide a panoramic screen converting apparatus of a projection image display system which allows an image signal to be formed as a panoramic screen on a screen.

In order to achieve the above object, according to the panoramic image conversion apparatus of the projection type image display system according to the present invention, a sampling clock in which clock periods are supplied in a variable period unit for each image scanning period of an input image signal is supplied. Data conversion means for converting the sampling rate in response to the pulse to generate a panoramic picture effect, and a recording clock supplied with a variable clock period for the image data converted by the data conversion means in predetermined variable periods. Image memory means for reading image data synchronously recorded in a read clock supplied with a constant clock period, and for converting image data read from the image memory means into a form of an analog signal Inverse converting means, the signal converted into the panorama screen form Image driving means for driving the image signal pixel-by-pixel with respect to the image signal, image display means for performing a tilt transformation of the pixel unit through image driving of the image driving means to form a panoramic screen on the screen, and scanning each image of the video signal A variable clock generating means for supplying a clock pulse having a variable clock cycle for each of a plurality of variable period units divided for a period to the data converting means as a sampling clock pulse and for supplying the image memory means as a read clock; An output clock generating means for generating a clock pulse having a clock pulse and supplying it to the video memory means as a read clock, and supplying it as a synchronous clock to the data inverse conversion means, a horizontal counting means for counting a horizontal synchronous pulse of the video signal, and the video signal. Multiple variable period units are divided for each image scanning period of The data memory means for enabling the recording / reading operation of the video memory means and the count value of the horizontal synchronous pulse counted by the horizontal counting means. Control means for recognizing a plurality of divided variable period units set by means of setting data of the means through a timing operation of the timing pulse generator so that the variable clock generating means controls the clock period to be variable corresponding to the plurality of divided variable periods Provided is a panoramic screen conversion apparatus of a projection type image display system provided with.

Preferably, the variable clock generating means includes a plurality of divided clock generators for generating clock pulses each having a different clock period, and a plurality of divided clocks divided by the control means for each image scanning period of the video signal. And a switching switch which is fast-switched so that clock pulses having different clock periods from the plurality of frequency division clock generators are supplied to the data conversion means and the image memory means in a limited time corresponding to the variable period of.

More preferably, the clock pulses generated in the plurality of divided clock generators of the variable clock generating means are changed from clock cycles of narrow intervals to clock cycles of gradually wider intervals with respect to one image scanning period of the image signal, and then narrow intervals. It is gradually changed to a clock cycle of.

In addition, clock pulses that are variable for each of a plurality of variable period units generated from the variable clock generating means and clock pulses of a predetermined clock period generated from the output clock generating means are the total number of clock pulses per one video scanning period of the video signal. The same occurs with each other.

According to the present invention made as described above, in the projection type image display system employing the AMA, the sampling rate of the image signal to be formed on the screen and the recording speed to the image memory are widened at a narrow interval at a wide interval at every one image scanning period. By varying the data from the interval to the narrow interval again, data processing is performed so that a panoramic screen is formed such that an image formed on the left / right screen on the screen is generally wider and the image is narrower toward the center.

1 is a block diagram showing a panoramic screen converting apparatus of a projection image display system according to a preferred embodiment of the present invention;

2 is a timing chart showing a generation state of a recording clock WCK and a read clock RCK for converting a video signal to implement a panoramic screen according to an embodiment of the present invention;

3 is a view showing a state in which a panoramic screen is formed on the screen according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10 --- data converter, 12 --- video memory,

14 --- data inverse converter, 16 --- AMA driver,

18 --- AMA panel, 20 --- first division clock generator,

22 --- second divider clock generator, 24 --- third divider clock generator,

26 --- switching switching part, 28 --- PLL circuit part,

30 --- counter, 32 --- data memory,

34 --- Timing Pulse Generator, 36 --- Microcomputer.

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

1 is a block diagram showing a panoramic screen converting apparatus of a projection type image display system according to a preferred embodiment of the present invention. In the apparatus of the present invention, reference numeral 10 denotes a switching switching operation of the switching switching unit 26, which will be described later. The video signal Vin is sampled at a narrow interval gradually at a narrow interval every 1 image scanning period 1H synchronously with a sampling clock supplied with a variable clock cycle at a predetermined variable period. It represents a data conversion unit consisting of an analog-to-digital converter (ADC) that is sampled at intervals and converted into digital data.

In addition, reference numeral 12 is enabled by the write enable signal W ENA, and the clock cycles are generated in the first to third divided clock generation units 20, 22, and 24 described later, respectively. The switching unit 26 receives a clock pulse, which is supplied in a limited period divided by, for example, five equal parts for one image scanning period 1H, as a recording clock WCK, by the switching switching unit 26. In addition to recording the image data from 10), a clock pulse having an always constant clock cycle from the PLL circuit unit 28 described later, which is enabled by the read enable signal R ENA, is supplied as a read clock RCK. An image memory composed of a line memory that reads recorded image data, for example, stores data in image line units.

Reference numeral 14 denotes a DAC (Digital-Dig) which converts image data read from the image memory 12 into an analog signal synchronously with a clock pulse having a constant clock cycle generated from the PLL circuit section 28 described later. A data inverse converting section consisting of an analog converter.

Reference numeral 16 is used to drive a plurality of AMAs provided in the AMA panel 18 on a pixel-by-pixel basis by an image signal voltage of a video signal signal-converted in the form of a panoramic screen by the data inverse converter 14. The AMA driver is configured to generate projection light in the form of the panoramic screen so that the panoramic screen is formed on the screen (see FIG. 3).

Further, reference numeral 20 denotes a first division clock generation unit for dividing the synchronization signal SYNC separated from the image signal Vin by a predetermined division ratio to generate clock pulses having a clock interval of the narrowest interval. 22 divides the synchronizing signal SYNC of the video signal Vin by a predetermined division ratio so that a clock period having a wider interval than a clock period of the clock pulse generated from the first division clock generation unit 20 is obtained. A second division clock generator for generating a clock pulse having a clock pulse 24 has a clock period wider than that of the second division clock generator 22 by dividing the synchronization signal SYNC according to a predetermined division ratio. A third division clock generation unit for generating a pulse is shown.

Here, according to the present invention, the first to third divided clock generators 20, 22, and 24, each of which generates a clock pulse having a variable clock cycle, are generated by varying three separate clock cycles. However, in order to generate a finer panoramic picture effect, a divided clock generation unit for generating a clock pulse having a variable clock cycle may be further provided to enable generation of clock pulses having three or more individual clock cycles.

Reference numeral 26 denotes clock pulses having different clock cycles generated from the first to third divided clock generation units 20, 22, and 24 by switching control of the microcomputer 36, which will be described later. A switching switch which is switched at a high speed so as to be supplied as a sampling clock to the data conversion section 10 and correspondingly supplied to the image memory 12 as a write clock WCK corresponding to a plurality of variable period units. .

Here, as shown in FIG. 2, the switching switching unit 26 may include first to fifth variable periods divided by five equal to an effective video period included in each video scanning period H of the video signal Vin. Switching at high speed corresponding to T1 to T5 is performed. In the first variable period T1, a clock pulse having the narrowest interval clock cycle generated from the first divided clock generation unit 20 is outputted. In the second variable period T2, a clock pulse having a clock interval having a wider interval than that of the first divided clock generator 20 generated from the second divided clock generator 22 is output. In the third variable period T3, a clock pulse having the widest interval clock period generated from the third divided clock generation unit 24 is generated. In the fourth variable period T4, the second divided clock generation unit is generated. A clock pulse generated from 22 is outputted, and the fifth variable The switch T5 is switched to output a clock pulse generated from the first frequency division clock generator 20.

Reference numeral 28 denotes a clock pulse having a constant clock cycle, which is always enabled by the microcomputer 36 to be described later and PLL operation at a predetermined division ratio, thereby reading a read clock (RCK) into the image memory 12. A PLL circuit section for supplying the data inverse conversion section 14 as a synchronous clock is provided.

As shown in FIG. 2, the PLL circuit unit 28 generates the first to third divided clocks by the number of clock pulses 1 to N that are generated for each video scanning period 1H of the video signal Vin. The clock cycles are generated to be generated equal to the number of clock pulses 1 to N of all clock pulses generated from the units 20, 22 and 24 and sequentially supplied through the switching switching unit 26.

Also, reference numeral 30 denotes a counter for counting the horizontal synchronization signal H SYNC separated from the image signal Vin and receiving the vertical synchronization signal V SYNC to reset the operation.

Further, reference numeral 32 denotes a data memory in which setting data in which a plurality of variable period units divided into, for example, five parts divided into valid video periods corresponding to each video scanning period H of the video signal Vin are stored are stored. 34 denotes a timing pulse generator that clocks time through an oscillation clock generated from a clock pulse generating means such as a crystal oscillator to generate a timing clock.

Here, the setting data set in the data memory 32 is about 1.4μ LS during one video scanning period 1H having about 63.5μLS when the input video signal Vin has an NTSC signal format. 52.8 excluding horizontal blanking periods of about 10.7μLS +7, -2 such as front porch, about 4.8μLS back porch, and about 4.7μLS horizontal synchronous pulse (H SYNC) A variable period unit (that is, each variable period unit is about 10.56 µLS -1.4, +0.4) is formed by dividing the effective video period of µLS -7, +2 by 5, for example.

Further, reference numeral 36 generates a write / read enable signal W ENA / R ENA so that the image data can be recorded / read in the image memory 12, and counted from the counter 30. Whenever the count value of the horizontal synchronizing signal H SYNC is input, the timing pulse generator 34 is timed on the basis of the setting data from the data memory 32, so that the switching switching unit is divided into, for example, five variable periods. Reference numeral 26 denotes a microcomputer for controlling switching.

According to the present invention having the above-described configuration, the data conversion unit 10 and the image memory 12 gradually shift from the clock period of a narrow interval with respect to the effective video period according to one video scanning period 1H of the video signal Vin. A sampling operation and a recording operation of image data are performed at a sampling rate and a recording rate synchronously with a clock pulse generated by varying a clock cycle at a wide interval and gradually varying at a clock interval of a narrow interval. As described above, the left / right image area of the image formed on the screen is the widest, and a panoramic screen in which the image area is narrower toward the center is generated.

Next, the operation of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, in a projection type image display system in which an image is formed on a screen (not shown) through inclination deformation of a plurality of AMAs corresponding to a plurality of pixels with respect to an image signal Vin, a panoramic image is formed on the screen. In the counter 30, the counter 30 resets its operation by the vertical synchronization signal V SYNC while counting the horizontal synchronization signal H SYNC included in the input video signal Vin. 36 determines one video scanning period H of the video signal Vin based on the count value of the horizontal synchronizing signal counted by the counter 30, and sets one video scan set by the setting data of the data memory 32. For example, in the case of one video scanning period 1H of 63,5 µLS, when the video signal Vin has an NTSC signal format, for example, the variable period unit divided into five equal portions every effective video period of the period 1H. Horizontal blanking period of μLS + 7, -2 The switching switching unit 26 recognizes the effective video period of about 52.8 μLS -7, +2 by dividing into 5 by about 10.56 μLS -1.4, +0.4 for each variable period unit) through the timing operation of the timing pulse generator 34. ) Is controlled to be synchronously fast switched in each of the variable periods divided into five equal parts.

Accordingly, the switching switching unit 26 switches switching corresponding to the first to fifth variable periods T1 to T5 obtained by dividing the effective video period of one video scanning period 1H into five equal parts as shown in FIG. As a result, the switching is switched to the first frequency division clock generation unit 20 which generates a clock pulse having the clock interval of the narrowest interval in the first variable period T1, and the first variable period in the second variable period T2. The switching is switched to the second divided clock generator 22 which generates a clock pulse having a wider clock cycle than the clock pulse from the divided clock generator 20, and the widest clock cycle is applied to the second variable period T3. The switching is switched to the third divided clock generation unit 24 that generates the clock pulse having the same, while the switching is switched to the second divided clock generation unit 22 during the fourth variable period T4, and the fifth variable period T5. Is switched to the first frequency division generator 20 side.

On the other hand, the data converter 10 receives a video signal Vin as an object to be displayed on the screen, and the clock cycle is varied every five periods of time by the switching switching operation of the switching switch 26. A sampling pupil is performed at a sampling rate synchronous with the supplied sampling clock to convert it into a form of digital data. The image memory 12 is enabled by the write enable signal W ENA from the microcomputer 36, and the switching is performed. By the high-speed switching switching operation of the switching section 26, image data through the data converter 10 is recorded at a recording speed synchronous with a recording clock WCK supplied with a variable clock period divided into five equal periods. Done. At this time, the PLL circuit section 28, through the switching switching section 26, performs a PLL-operated clock pulse at a predetermined division ratio such that the clock number is equal to the total number of clock pulses generated for one image scanning period 1H. It will always occur with the same clock cycle.

Accordingly, the image memory 12 is enabled by the read enable signal R ENA from the microcomputer 36 and supplied with the clock pulse from the PLL circuit unit 28 as the read clock RCK. The image data is read out, and the data inverse converter 14 receives the clock pulse from the PLL circuit unit 28 as a synchronous clock to convert the read image data into an analog signal.

Accordingly, the AMA driver 16 receives the image signal through the data inverse converter 14 as an image signal voltage and drives the plurality of AMAs provided in the AMA panel 18 to correspond to the plurality of pixels. As a result of this being generated and projected onto the screen, an image having a panoramic screen form is formed on the screen as shown in FIG.

The present invention as described above is not limited to the above embodiments and can be carried out in various modifications without departing from the gist of the present invention. For example, the present invention is divided into five equal parts for an effective video period of one video scanning period (1H). Means for generating clock pulses of which the clock period is varied in three ways, such as the first to third divided clock generation units 20, 22, and 24, according to the variable periods of the first and third divisions. The divided clock generation unit may be further provided to enable generation of clock pulses in which three or more clock cycles are respectively varied.

According to the present invention made as described above, in the projection type image display system employing AMA to form an image, the panoramic screen on the screen is varied by varying the sampling rate for the image signal and the recording speed into the image memory in predetermined periods. As it is formed, the projection-type image formed on the screen can be displayed more magnificently and vividly, and the advantage of maximizing the viewing effect is obtained.

Claims (4)

For each video scanning period H of the input image signal Vin, the clock period is varied in a predetermined variable period unit so that the sampling rate is converted to correspond to the sampling clock pulse supplied to convert the data so that a panoramic screen effect is generated. Data conversion means (10), A read clock supplied with a constant clock period while recording the image data converted by the data converting means 10 in synchronization with a recording clock WCK supplied with a variable clock period for a predetermined variable period. Image memory means (12) in which image data recorded synchronously to RCK) is read; Data inverse conversion means (14) for converting the image data read out from the image memory means (12) into an analog signal; Image driving means (16) for driving pixels on the basis of the image signal converted into the panoramic screen; Image display means (18) for inclining deformation in units of pixels through image driving of the image driving means (16) to form a panoramic screen on the screen; The image memory is supplied with a clock pulse having a variable clock cycle for each of a plurality of variable period units divided for each image scanning period H of the image signal Vin as a sampling clock pulse. Variable clock generating means for supplying the means 12 as a read clock WCK, An output clock generating means 28 for generating a clock pulse having a constant clock period and supplying it to the image memory means 12 as a read clock RCK, and supplying the data inverse conversion means 14 as a synchronous clock; Horizontal counting means 30 for counting the horizontal synchronous pulse of the video signal (Vin), Data memory means 32 in which setting data in which a plurality of variable period units are divided are stored for each video scanning period H of the video signal Vin; On the basis of the result of enabling the recording / reading operation of the image memory means 12 and receiving the count value of the horizontal synchronous pulse counted by the horizontal counting means 30, the data memory means 32 A control for recognizing a plurality of divided variable period units set by setting data through a timing operation of the timing pulse generator 34 so that the variable clock generating means controls the clock period to be variable corresponding to the plurality of divided variable periods. And a means (36). A panorama screen converting apparatus of a projection image display system. 2. The variable clock generating means according to claim 1, wherein the variable clock generating means comprises a plurality of divided clock generating parts which respectively generate clock pulses having different clock periods, and switching control of the image signal Vin. Clock pulses having different clock periods from the plurality of divided clock generators corresponding to the plurality of variable period units divided for each image scanning period H are generated by the data converting means 10 and the image memory means 12. And a switching switching unit 26 which is switched at a high speed so as to be limitedly supplied to the panoramic display device of the projection type image display system. The clock pulse generated by the plurality of divided clock generators of the variable clock generating means is a narrow interval with respect to the effective video period according to one video scanning period (1H) of the video signal (Vin). A panoramic screen converting apparatus of a projection image display system, characterized in that it is varied gradually from a clock cycle of a clock cycle to a clock cycle, and gradually changes to a clock cycle of a narrow interval. The method of claim 1, wherein clock pulses varying for each of a plurality of variable period units generated from the variable clock generation means and clock pulses of a constant clock period generated from the output clock generation means 28 are generated by the image signal Vin. A panoramic screen converting apparatus of a projection type image display system, characterized in that the total number of clock pulses is generated to be equal for each valid video period according to one video scanning period (1H).