KR100232600B1 - Convergence data generating device of projection image device - Google Patents

Abstract

The present invention relates to an apparatus for generating convergence data of a projection type imager comprising a microcomputer, a field determination unit, a vertical position counter unit, and an interpolation operation unit, and each scan line irrespective of a field when an interlaced scanning mode is set in a projection type projector. Because different vertical position values proportional to the distance from the top of the screen can be assigned to generate accurate convergence data of the entire scanning line, the miss-convergence of R, G, and B is accurately corrected for each scanning line so that Image quality is improved.

Description

Convergence Data Generator of Projection Imaging Equipment

The present invention relates to an apparatus for generating convergence data of a projection-type imaging device. In particular, when the interlaced scanning mode is set, the exact vertical position value (distance from the upper part of the screen) of the current scanning line is independent of each field constituting the screen of one frame. The present invention relates to an apparatus for generating convergence data of a projection type imaging apparatus capable of generating accurate convergence data of a current scan line.

Projection television, one of the projection imagers, is generally used to project red, blue, and green electron beams from R (Red), G (Green), B (Blue), and Brown (CRT: Cathode Ray Tube) onto the screen. As shown in FIG. 1, a color mismatch of R, G, and B, that is, miss-convergence (miss-) is displayed on an image displayed on the screen because the incident angles of the electron beams of the electron beams are different from each other. convergence).

The miss-convergence of R, G, and B can be corrected by adjusting the electron beam path of each CRT by applying a correction current in the horizontal and vertical directions to the convergence yokes of the CRTs. The correction current values in the horizontal and vertical directions that can correct the convergence are referred to as convergence data.

Meanwhile, the scanning method of the projection television is largely divided into a sequential scanning method and an interlaced scanning method. In the sequential scanning method, one frame screen is composed of one field as shown in FIG. (1 → 2 → 3 → 4 → 5 → 6 → 7), and the interlaced scanning method has two fields, that is, even fields, as shown in FIG. (even field) and odd field (odd field), the even field scan line is scanned, and the odd field scan line is scanned (1 → 2 → 3 → 4 → 4 '→ 5 → 6 → 7).

A projection television employing a conventional sequential scanning method stores all the convergence data of all scan lines (scan lines 1 through 7 in FIG. 2) at a predetermined position in the memory, and then stores the converged data of the current scan lines in the scanning order. The misconvergence of R, G, and B was corrected for each scan line by reading from and applying the convergence yoke of each CRT.

In addition, a projection television employing the conventional interlaced scanning method stores only the corresponding convergence data of an even field scan line (scan lines 1 to 4 in FIG. 3) at a predetermined position in the memory, and then converges data of the current scan line when the even leading head is driven. Read from the memory and apply it to the convergence yoke of each CRT, and if the odd field is driven, perform filtering using the convergence data of the even field scan lines (scan lines 1 to 4 in Fig. 3), and the resulting convergence correction The misconvergence of R, G, and B was corrected for each scan line by applying the waveform to the conversion yoke of each CRT.

However, such a method has a problem in that the amount of converged data to be stored in the memory requires a large amount of memory, thereby increasing the manufacturing cost of the projection television.

For example, in the case of NTSC type projection television with a total of 525 players, the sequential scanning mode is set, even if the convergence data of the scanning lines 1 to 525 are all stored in the memory, and the interlaced scanning mode is set. Since all convergence data of scan lines 1 to 525 should be stored in the memory, it can be seen that a large memory is used for storing the converged data.

Therefore, conventionally, only the convergence data of the sauc scan lines which are separated by a predetermined interval among all scan lines is stored in the memory, and then vertical interpolation using the converged data stored in the memory and the vertical position value of each scan line (distance from the top of the screen) is performed. A method of reducing the memory usage by seeking to generate convergence data of the entire scanning line has been sought.

That is, the convergence data generating apparatus of the projection imaging apparatus according to the prior art includes a microcomputer 1 which outputs an active signal when the interlaced scanning mode is currently set as shown in FIG. 4; When the active signal is input, in synchronization with the horizontal and vertical deflection blanking signals (H.BLK, V.BLK), N is counted by 1, and the vertical position values of the scan lines corresponding to the even field are sequentially output, and then N by 1 again. Counts and outputs the vertical position value of the scan line corresponding to the odd field in sequence, and if the active signal is not input, counts each one from N in synchronization with the horizontal and vertical deflection blanking signals H.BLK and V.BLK. A vertical position counter section 2 which sequentially outputs the vertical position values of the scanning lines; And an interpolation calculator 4 which generates convergence data of each scan line by performing vertical interpolation using the vertical position value output from the vertical position counter 2 and the convergence data of some scan lines stored in the memory 3.

The operation method of the prior art configured as described above is as follows.

First, the microcomputer 1 determines which scanning mode is set in the present projection imager, and outputs an active signal to the vertical position counter 2 when the interlaced scanning mode is set.

When the active signal is input, the vertical position counter unit 2 synchronizes with the horizontal and vertical deflection blanking signals H.BLK and V.BLK and counts each one from N to vertical position values of the plurality of scan lines corresponding to the even field. Are sequentially output to the interpolation calculator 4, and are then synchronized with the horizontal and vertical deflection blanking signals (H.BLK and V.BLK), and counted from N by 1 to sequentially turn the vertical position values of the plurality of scan lines corresponding to the odd field. It outputs to the said interpolation calculating part 4 as it is.

For better understanding, referring to FIG. 3, when N = 0, the vertical position values of 1, 2, 3, 4, and scan lines corresponding to even fields are 0, 1, 2, and 3, respectively. , The vertical deviation values of the scan lines 4 ', 5, 6, and 7 corresponding to the odd field are 0, 1, 2, and 3, respectively.

The interpolation calculator 4 performs vertical interpolation using the vertical position value of the current scan line input from the vertical position counter 2 and the convergence data of some scan lines stored in the memory 3 to perform convergence data of the current scan line. Create and print.

The scan lines 1 and 4 ', the scan lines 2 and 5, the scan lines 3 and 6, and the scan lines 4 and 7 are assigned the same vertical position values, so the convergence data generated by the interpolation calculator 4 is the same. Lose.

That is, the scan lines 1 and 4 ', the scan lines 2 and 5, the scan lines 3 and 6, and the scan lines 4 and 7 are interpolated because their vertical differences are the same, even though the distance from the top of the screen is different. The convergence data generated by the calculator 4 is not an accurate value.

On the other hand, when the sequential scanning mode is currently set in the projection-type imaging device and the microcomputer 1 does not output the active signal to the vertical position counter unit 2, the vertical position counter unit 2 is a horizontal and vertical deflection blanking signal ( H.BLK, V.BLK) are counted from N by 1 and the vertical position values of all the scanning lines proportional to the distance to the upper screen are sequentially output to the interpolation calculating section 4.

The interpolation calculator 4 generates convergence data of the current scan line by performing vertical interpolation using the vertical position value of the current scan line output from the vertical position counter 2 and the convergence data of some scan lines stored in the memory 3. Then print.

The convergence data of the current scan line output from the interpolation calculating section 4 is applied to the convergence yoke of each CRT to adjust the path of each electron beam (current scan line).

However, the convergence data generating apparatus of the projection imaging apparatus according to the prior art can generate accurate convergence data of each scan line when the sequential scanning mode is set. Although convergence data can be generated, when the interlaced scanning mode is set, it is not possible to generate accurate convergence data of each scan line as described above. That is, the scanning order among the scan lines corresponding to the even field and the odd field is different. Since the convergence data of the same two scan lines is the same, the miss-convergence of R, G, and B is not corrected correctly for each scan line, thereby degrading the image quality of the projection imaging apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and when the interlaced scanning mode is set in a projection imaging apparatus, different appropriate vertical position values proportional to the distance from the upper portion of the screen to each scan line regardless of the field It is an object of the present invention to provide an apparatus for generating convergence data of a projection type imaging apparatus capable of generating accurate convergence data of an entire scanning line by assigning the same.

1 is a miss-convergence form of R (Red), G (Green), and B (Blue) of a typical projection television.

2 is a conceptual diagram of a general sequential scanning method.

3 is a conceptual diagram of a general interlaced scanning method.

4 is a block diagram showing the configuration of a convergence data generating apparatus of a projection imaging apparatus according to the prior art.

5 is a block diagram showing the configuration of an apparatus for generating convergence data of a projection imaging apparatus according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

11: Micon 12: Field Determination Unit

13 vertical position counter 14 memory

15: interpolation calculator

According to a feature of a convergence data generating apparatus of a projection type imaging apparatus according to the present invention for solving the above problems, a microcomputer for outputting an active signal when the interlaced scanning mode is currently selected; A field determination unit configured to receive the active signal, compare phase differences between horizontal and vertical deflection blanking signals, determine a currently driven field among even and odd fields according to the comparison result, and then output a corresponding field signal; After the active signal is input, when an even field signal is inputted by a field determination unit, two horizontal equations are counted from N in synchronization with the horizontal and vertical deflection blanking signals, and the vertical position values of the corresponding scan lines are sequentially output. A vertical position counter unit which counts from N-1 to 2 in synchronization with the horizontal and vertical deflection blanking signals and sequentially outputs vertical position values of the corresponding scan lines; And an interpolation calculator configured to generate convergence data of each scan line by performing vertical interpolation using the vertical position value of the vertical position counter unit and convergence data of some scan lines already stored in the system.

Hereinafter, an embodiment of a convergence data generating apparatus of a projection type imaging apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

One embodiment of the present invention includes a microcomputer 11 for outputting an active signal when the interlaced scanning mode is currently set as shown in FIG. When the active signal is input, the phase difference between the horizontal and vertical deflection blanking signals H.BLK and V.BLK is compared to determine which field is driven between the current even field and the odd field, and then the even field signal or A field determination unit 12 for outputting an odd field signal; After the active signal is input, when the even field signal is input by the field determination unit 12, the field determination unit 12 registers the horizontal and vertical deflection blanking signals H.BLK and V.BLK and counts 2 from N to the vertical of the scan line. When the odd field signals are input, the position values are sequentially output, and in synchronization with the horizontal and vertical deflection blanking signals (H.BLK and V.BLK), N-1 is counted from 2 and the vertical position values of the corresponding scan lines are sequentially output. A vertical position counter section 13; The interpolation calculator 15 generates vertical convergence data of each scan line by performing vertical interpolation using the vertical position value output from the vertical position counter 913 and the convergence data of some scan lines previously stored in the memory 14. do.

The vertical position counter 13 is registered in the horizontal and vertical deflection blanking signals H.BLK and V.BLK when the active signal is not input, that is, when the sequential scanning mode is set. To sequentially output the vertical position values of all the scanning lines.

The operation method of an embodiment of the present invention configured as described above is as follows.

First, the microcomputer 11 determines which scan mode is currently set in the projection-type imaging device, and outputs an active signal to the field determiner 12 and the vertical position counter 13 when the interlaced scan mode is set.

When the active signal is input, the field determiner 12 compares the phase difference between the horizontal and vertical deflection blanking signals H.BLK and V.BLK to determine which of the even field and the odd field is being driven. One of the field signal and the odd field signal is outputted to the vertical position counter section 13.

When the even field signal is input after the active signal is input, the vertical position counter 13 counts 2 from N in synchronization with the horizontal and vertical deflection blanking signals H.BLK and V.BLK to correspond to the even field. The vertical position values of the plurality of scan lines are sequentially output to the interpolation calculator 15, and when the odd field signal is input after the active signal is input, the N and N are synchronized with the horizontal and vertical deflection blanking signals H.BLK and V.BLK. The vertical position values of a plurality of scan lines corresponding to odd fields are counted from -1 to 2 and output to the interpolation calculator 15 in order.

For better understanding, referring to FIG. 3, when N = 0, the vertical position values of 1, 2, 3, 4, and scan lines corresponding to even fields are 0, 2, 4, and 6, respectively. Since the vertical deviations of the scan lines 4 ', 5, 6, and 7 corresponding to the odd fields also become -1, 1, 3, and 5, respectively, the total scan lines (scan lines 1 through 7) are different from the fields. Regardless, a vertical position value proportional to the distance to the upper portion of the screen may be allocated.

The interpolation calculator 15 performs vertical interpolation using the vertical position value of the current scan line input from the vertical position counter 13 and the convergence data of some scan lines stored in the memory 14 to perform convergence data of the current scan line. Create and print.

Since the interpolation calculator 15 performs vertical interpolation by receiving different vertical position values proportional to the distance to the upper portion of the screen for each scan line, it is possible to generate accurate convergence data of each scan line.

Subsequently, the convergence data of the current scanning line output from the interpolation calculating unit 15 is applied to the convergence yoke (not shown) of the R, G, and B CRT tubes of the tux-type imaging device, and the red, blue, and green electron beams (current scanning line). Correctly adjust the path of.

For example, when the present invention is applied to an NTSC type projection television having a total of 525 players, vertical position values of a plurality of scan lines respectively corresponding to even and odd fields may be allocated as shown in Table 1 below. (If N = -262)

TABLE 1

On the other hand, when the sequential scanning mode is currently set in the projection-type imaging device and the microcomputer 11 does not output an active signal to the field determining unit 12 and the vertical position counter unit 13, the field determining unit 12 operates. Instead, the vertical position counter 13 counts each one from N in synchronization with the horizontal and vertical deflection blanking signals H.BLK and V.BLK so that the vertical position value of the entire scanning line is proportional to the distance to the upper portion of the screen. Are sequentially output to the interpolation calculator 15.

The interpolation calculator 15 generates convergence data of the current scan line by performing vertical interpolation using the vertical position value of the current scan line output from the vertical position counter 13 and the convergence data of some scan lines stored in the memory 14. Then print.

The conversion data of the current scanning line output from the interpolation calculating section 15 is applied to the convergence yoke of each CRT as described above to adjust the path of each electron beam (current scanning line).

As such, when the interlaced scanning mode is set in the projection imaging apparatus, different vertical position values proportional to the distance to the upper portion of the screen may be assigned to each scan line regardless of the field, thereby generating accurate convergence data of the entire scan line. In other words, it is possible to prevent the convergence data of two scan lines having the same scanning order among the scan lines corresponding to the even field and the odd field, respectively, so that the misconvergence of R, G, and B is accurately corrected for each scan line. The image quality of the projection imager is improved.

Claims (2)

A microcomputer that outputs an active signal when a current interlaced scanning mode is selected; A field determination unit configured to receive the active signal, compare phase differences between horizontal and vertical deflection blanking signals, determine a currently driven field among even and odd fields according to the comparison result, and then output a corresponding field signal; After the active signal is input, when an even field signal is input by the field determination unit, the N-field signal is sequentially counted from N by 2 in synchronization with the horizontal and vertical deflection blanking signals, and the vertical position value of the corresponding scan line is sequentially output. A vertical position counter unit which counts from N-1 to 2 in synchronization with the horizontal and vertical deflection blanking signals and sequentially outputs vertical position values of the corresponding scan lines; Convergence data of the projection type imaging device, characterized in that it comprises an interpolation calculator for generating the convergence data of each scan line by performing vertical interpolation using the vertical position value of the vertical position counter unit and the convergence data of some scan lines already stored in the system. Generating device. 2. The vertical position counter of claim 1, wherein the vertical position counter unit does not receive the active signal and outputs the vertical position values of the entire scan lines in order by counting each one from N in synchronization with the horizontal and vertical deflection blanking signals. Convergence data generating device of virtual video equipment.