JPH0654335A - Liquid crystal projector - Google Patents

Abstract

PURPOSE:To easily and efficiently adjust the convergence of a liquid crystal projector. CONSTITUTION:The pictures of liquid crystal display modules for displaying red, blue and green are made synthesizable. The liquid crystal display panel 63 of the respective liquid crystal display modules is provided with scanning electrodes X1, X2, X3, X4... four times as many as signal electrodes Y1, Y2, Y3,.... One picture element is constituted of a signal electrode and four common electrodes and the combination of the scanning electrodes X1, X2, X3, X4,... driven simultaneously with the respective signal electrodes Y1, Y2, Y3,... is changed. Thus, the positions of display picture elements on the liquid crystal display panel 63 are adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector having a convergence adjusting function.

[0002]

2. Description of the Related Art Generally, in a liquid crystal projector which uses a plurality of liquid crystal display panels and combines the images by a combining means to project and display one image, the images of the plurality of liquid crystal display panels are correctly combined. If this is not the case, the image will be blurred, so the position of each liquid crystal display panel or the orientation of the combining means must be adjusted so that the images are combined correctly. Therefore, conventionally, in the final adjustment process, R,
The so-called convergence adjustment is performed to match the G and B color patterns on the screen.

Conventionally, such convergence adjustment is performed by manually operating a micrometer or the like for each of the R, G, and B liquid crystal panels, and moving each panel back and forth and left and right to perform convergence. There is.

[0004]

However, when the convergence is adjusted in this way, the worker detaches the exterior of the projector, operates the micrometer to make the adjustment, and then attaches the exterior again. However, it takes time and effort to perform a series of these adjustments, and especially after the exterior has been attached, shocks may be added for some reason, and the combined convergence may be misaligned. Since it had to be repeated, there was a drawback that it was inferior in terms of ease of handling. The present invention is
The present invention has been made in view of the above circumstances, and an object thereof is to provide a liquid crystal projector that can perform convergence adjustment easily and efficiently.

[0005]

SUMMARY OF THE INVENTION The present invention is a liquid crystal projector having image synthesizing means for synthesizing images of liquid crystal display modules for red, blue and green display, wherein the liquid crystal display module is a signal forming one pixel. A liquid crystal display panel having a plurality of electrodes and / or scanning electrodes, and at least one of the signal electrodes and the scanning electrodes of the liquid crystal display panel being driven at the same time by changing at least The position of the display pixel of the liquid crystal display panel of the two liquid crystal display modules can be adjusted.

[0006]

As a result, according to the present invention, in each liquid crystal panel of at least two liquid crystal modules of red, blue, and green display, at least one of a signal electrode and a scanning electrode is driven simultaneously. It is possible to adjust the convergence by moving the display pixel by changing the.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a display area adjusting circuit for an R (red) display liquid crystal module. Other G
The display area adjusting circuit for the (green) and B (blue) display liquid crystal modules conforms to the configuration of FIG. 1, and thus the description thereof is omitted here.

In this case, the video signal is sent to the chroma circuit 1 and the sync separation circuit 2. The sync separation circuit 2 separates the horizontal and vertical sync signals included in the video signal into a horizontal sync signal H-SYNC and a vertical sync signal V-SYNC.
Is output to the timing control circuit 3.

The timing control circuit 3 includes a screen control section 4
Are connected. The screen control unit 4 has a horizontal shift control unit 41 for horizontally moving and adjusting the display areas of the R, G, and B liquid crystal panels, and a vertical shift control unit 42 for vertically moving and adjusting. There is. The output signal of the horizontal shift control section 41 and the output signal of the vertical shift control section 42 are supplied to the timing control circuit 3, respectively. Further, the screen control section 4 has a liquid crystal module selection section 43 for selecting each of the R, G and B liquid crystal modules which require adjustment of the display area.

The timing control circuit 3 includes a sync separation circuit 2
The sampling signal .phi.s is generated based on the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC which are given by the above, and the sampling signal .phi.s is given to the A / D conversion circuit 5. In addition, the timing control circuit 3 outputs a timing signal (scan start signal) S to the common driver 62 of the liquid crystal module 6 according to the output signal provided from the screen control unit 4.
The signal electrode driver 61 controls the generation timing of RR and controls the combination of scan electrodes X1, X2, X3, X4, ...
The timing of generation of the timing signal (data reading timing signal) STO.

In this case, when the liquid crystal module (B) (not shown) is selected by the liquid crystal module selection unit 43 of the screen control unit 4, the timing control circuit 3 also applies to the liquid crystal module (B). When (G) is selected, the liquid crystal module (G) can be operated in the same manner as described above.

The A / D conversion circuit 5 generates digital data of a plurality of bits, for example, 4 bits, by synchronizing the chroma signal output from the chroma circuit 1 with the sampling signal φs. Of the signal electrode driver 61. in this case,
The digital data of the A / D conversion circuit 5 is G (not shown),
It is also designed to be sent to each liquid crystal module of B.

The liquid crystal module 6 includes a signal electrode driver 6
1, a scan electrode driver 62 and a liquid crystal panel 63 for R (red) display. In this case, the liquid crystal panel 63 has signal electrodes Y1, Y2, Y3 as shown in FIG.
, Four times the scanning electrodes X1, X2, X3, X4
, And each pixel is configured by one signal electrode and four scanning electrodes. For example, when displaying the pixels A, B, C, and D respectively as shown in FIG.
For pixel A, signal electrode Y3 and scan electrodes X5, X6, X7
, X8, signal electrode Y2 and scan electrode X5 for pixel B
, X6, X7, X8, the pixel C corresponds to the signal electrode Y3 and the scan electrodes X9, X10, X11, and X12, and the pixel D corresponds to the signal electrode Y2 and the scan electrodes X9, X10, X11, and X12. ing. Further, the scan electrode driver 62 starts scanning at the timing of the timing signal SR / R from the timing control circuit 3 and causes the scan electrodes X1, X2, X3, X4, ... Of the liquid crystal panel 63 to follow a predetermined combination. Drive and signal electrode driver 61
Starts the data latch for the video data digitized by the A / D conversion circuit 5 at the timing of generation of the timing signal STO · R from the timing control circuit 3,
Depending on the data, the signal electrodes Y1 and Y of the liquid crystal panel 63
2, Y3, ... are driven. Next, the operation of the embodiment configured as described above will be described.

Now, as shown in FIG. 4, the pixels A, B, C, D of the reference liquid crystal module are a, and the pixels corresponding to the pixels A, B, C, D of the liquid crystal module to be synthesized are a, Assuming b, c, and d, the adjustment as described below is performed for such a liquid crystal module.

In this case, assuming that the liquid crystal module to be synthesized is the liquid crystal module (R), first, the liquid crystal module (R) is selected by the liquid crystal module selection unit 43 of the screen control unit 4, and then the R (red) display With respect to the liquid crystal panel 63 of the liquid crystal module 6, the screen controller 4 adjusts the timing of generation of the timing signal (data reading timing signal) STO / R for the signal electrode driver 61,
Further, the generation timing of the timing signal (scan start signal) SR · R to the scan electrode driver 62 is adjusted, and the combination of the scan electrodes X1, X2, X3, X4, ...

Here, in the reference liquid crystal module,
A data read timing signal is given to the signal electrode driver at the timing shown in FIG. 5B by the shift clock shown in FIG. 5A, and is taken in by the data read clock shown in FIG. 5C. The data S1, B, A, ... Shown in d) are given to the signal electrodes Y3, Y4, Y5, ... Shown in FIGS. Data A on electrode Y5
Is given. ), And for the scan electrode driver, the shift clock shown in FIG.
The scanning start signal is given at the timing shown in FIG. 2 and the scanning electrodes X1, X2, X3, X4,
It is assumed that each of the four ... Is controlled so that they are driven simultaneously.

On the other hand, in the R (red) display liquid crystal module 6, the pixels a, b, and
Since c and d are shifted by two signal electrodes in the horizontal direction (rightward in the drawing), the vertical shift control section 42 of the partial screen control section 4 causes the timing signal STO for the signal electrode driver 61.
The R generation timing is adjusted so as to be two shift clocks before the reference clock signal shown in FIG. 5B of the reference liquid crystal module. That is, the shift clock shown in FIG. 6A is adjusted so that the data read timing signal STO.R is generated at the timing shown in FIG.

In this case, when the timing signal STO.R is generated, the data S1, B, A, ... Shown in FIG. 9D are fetched by the data read clock shown in FIG. At the first data read clock from the signal STO.R, empty data (NONE) is shown on the signal electrode Y1 shown in FIG. 6 (e), and at the second data read clock that follows, empty data (NONE) is shown in FIG. The signal S1 is supplied to the signal electrode Y2 shown in the drawing, and the data S1, B, A, ... Are sequentially supplied to the signal electrodes Y3, Y4, and Y5 shown in FIGS. (In this case, data b is applied to the signal electrode Y4 and data a is applied to the signal electrode Y5).

On the other hand, the R (red) display liquid crystal module 6
, The pixels a, b, c, and d are vertically displaced (upward in the drawing) by 6 scanning electrodes with respect to the pixels A, B, C, and D, so that the horizontal shift control unit 41 causes the scanning electrode driver 62 to operate.
The timing of generating the scanning start timing signal SR.R for the reference liquid crystal module is as shown in FIG. 8B with respect to the shift clock in FIG. 8A, and the scanning start shown in FIG. The timing signal of (a) is adjusted to be two shots before the shift clock, and the pixels a and b are set to scan electrodes X11 to X14,
The pixels c and d control the scanning electrodes simultaneously driven so as to correspond to the scanning electrodes X15 to X18, respectively. Here, the scan electrodes X1 and X2 shown in FIG. 7C are simultaneously driven by the first shift clock from the scan start timing signal SR.R, and the scan electrodes X3 to X6 shown in FIG. Drive at the same time.
The scan electrodes X7 to X10 shown in FIG. 7, the scan electrodes X11 to X14 shown in FIG. 7F, and the scan electrodes X15 to X18 shown in FIG.

As a result, in the liquid crystal panel 63 of the R (red) display liquid crystal module 6, the pixels a, b, c and d are moved by two signal electrodes in the horizontal direction (left direction in the drawing), and at the same time in the vertical direction (shown in the drawing). This means that only six scanning electrodes have been moved downward), and as shown in FIG. 9, the pixels a, b, c, d of the liquid crystal panel 63 with respect to the reference pixels A, B, C, D of the liquid crystal module. Will be able to overlap.

Therefore, in this way, first R, G,
Based on one color of each color pattern of B, the horizontal shift control unit 41 according to the procedure described above for the remaining color patterns.
The convergence can be adjusted by moving and adjusting the respective positions of the actual display area by the vertical shift control unit 42.

That is, by operating the horizontal shift control unit 41 and the vertical shift control unit 42, the data read timing of the signal electrode driver 61 is shifted, or the scan start timing of the scan electrode driver 62 is shifted and the scan electrodes X1, X2, X3, By controlling the set of ...
Since the position of the actual display area can be moved, in order to adjust the conventional convergence, the worker removed the exterior of the projector, operated the micrometer, adjusted it, and then attached the exterior again. You can avoid these series of troublesome tasks,
Convergence adjustment can be performed easily and efficiently. If the horizontal shift control unit 41 and the vertical shift control unit 42 can be operated externally, even a skilled worker can easily perform convergence while watching the screen. It will be possible to reduce the number of adjustment items. Next, FIG.
It shows another embodiment of the present invention.

In this case, in the above-described embodiment, only the scanning electrodes of the liquid crystal panel are subdivided, but as shown in FIG. 10, the signal electrodes Y1, Y2, Y3, ... And the scanning electrodes X1, X2, X3. , X4, ... May be subdivided. Here, one pixel is a group of four signal electrode groups S
1, S2, S3, ... and a set of four scanning electrode groups C1 and C2
, C3, ...

As shown in FIG. 11, assuming that the pixels A, B, C, and D of the reference liquid crystal module are the corresponding pixels of the liquid crystal module to be synthesized, a, b, c, and d are as follows. As shown in FIG. 12, the adjustment for the liquid crystal module to be combined is performed by combining the signal electrode groups S1 ', S2' with the simultaneously driven combination of the signal electrodes Y1, Y2, Y3, ... For the pixel shift in the horizontal direction. , S3 ′, ..., and the data read timing is adjusted to prevent the scan electrode X1 from shifting in the vertical direction.
, X2, X3, X4, ... Simultaneously driven combinations are changed to scan electrode groups C1 ', C2', C3 ', ... And the scanning start timing is adjusted. In this case, the signal electrodes Y1, Y2, Y3, ... And the common electrodes X1, X2, X3 in the reference liquid crystal module,
The control timings of X4, ... Are shown in FIGS. 13A and 13B, and the signal electrodes Y1 and Y2 in the liquid crystal module to be combined are controlled.
, Y3, ... And common electrodes X1, X2, X3, X4, ... Control timings are as shown in FIGS. Therefore, in this way, more accurate pixel alignment can be performed in the horizontal direction and the vertical direction, and the same effect as that of the above-described embodiment can be expected.

The combination of subdivision of the signal electrode and the scanning electrode may be such that only the signal electrode is subdivided and one pixel is composed of four signal electrodes and one common electrode. Further, in the above description, the number of subdivided signal electrodes and scanning electrodes is four per pixel, but if the number of pixels per pixel is increased, more accurate pixel alignment can be realized. Besides, the present invention is not limited to the above-described embodiments, and can be implemented by appropriately modifying it without departing from the scope of the invention.

[0027]

According to the present invention, in each of the liquid crystal panels of at least two liquid crystal modules among the liquid crystal modules for displaying red, blue and green, at least one of the signal electrode and the scanning electrode is simultaneously driven. The display pixel can be moved by changing the electrode combination that is performed, and the convergence adjustment can be performed easily and efficiently.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a configuration of a liquid crystal panel used in an example.

FIG. 3 is a diagram for explaining an example.

FIG. 4 is a diagram for explaining an example.

FIG. 5 is a time chart for explaining an example.

FIG. 6 is a time chart for explaining an example.

FIG. 7 is a time chart for explaining an example.

FIG. 8 is a time chart for explaining an example.

FIG. 9 is a diagram for explaining an example.

FIG. 10 is a diagram for explaining the configuration of a liquid crystal panel used in another embodiment of the present invention.

FIG. 11 is a diagram for explaining another embodiment.

FIG. 12 is a diagram for explaining another embodiment.

FIG. 13 is a time chart for explaining another embodiment.

FIG. 14 is a time chart for explaining another embodiment.

[Explanation of symbols]

1 ... Chroma circuit, 2 ... Sync separation circuit, 3 ... Timing control circuit, 4 ... Screen control unit, 41 ... Horizontal shift control unit, 4
2 ... Vertical shift control unit, 43 ... Liquid crystal module selection unit,
5 ... A / D conversion circuit, 6 ... Liquid crystal module, 61 ... Signal electrode driver, 62 ... Scan electrode driver, 63 ... Liquid crystal panel.

Claims (1)

[Claims] 1. A liquid crystal projector comprising image synthesizing means for synthesizing images of liquid crystal display modules for displaying red, blue and green, wherein the liquid crystal display module has at least one of a signal electrode and a scanning electrode forming one pixel. A liquid crystal display panel having at least two liquid crystal display panels, comprising a liquid crystal display panel configured by a book, and changing the combination of at least one of the signal electrodes and the scanning electrodes of the liquid crystal display panel that are simultaneously driven. A liquid crystal projector that allows adjustment of pixel position.