JP2003348626A - Display device and method of adjusting display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust a drive signal of a display panel without the need for an exclusive connector in a display device and an adjustment method for the display device adapted to e.g. a camcoder. <P>SOLUTION: An external output terminal of a video signal SV used for display is used in common for output of drive signals R, G, B, COM. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and a method of adjusting the display device, and can be applied to, for example, a camera-integrated video tape recorder. According to the present invention, an external output terminal of a video signal to be used for display is also used as an output of a drive signal, so that a drive signal of a display panel can be adjusted without providing a dedicated connector.

[0002]

2. Description of the Related Art Conventionally, in a video tape recorder integrated with a camera, a signal level of each section is adjusted in a final adjustment step of a shipping inspection.

FIG. 4 is a block diagram showing a camera-integrated video tape recorder 1 together with an adjusting device 2. In this camera-integrated video tape recorder 1, a video signal source 3 is an image pickup mechanism and a recording / reproducing mechanism, and acquires an image pickup result under the control of a microcomputer 4 and records it on a magnetic tape. Play and output the result. The liquid crystal display unit 5 displays the video signal SV based on the imaging result output from the video signal source 3 at the time of recording, whereas the reproduction result similarly output from the video signal source 3 at the time of reproduction. Is displayed.

That is, in the liquid crystal display section 5, driving signals R, G, B and COM for the liquid crystal display panel 7 are generated from the video signal SV by the driver 6 and the amplifier circuits 8A to 8D.
Amplifies these drive signals R, G, B, and COM to drive the liquid crystal display panel 7. Here, among these drive signals R, G, B and COM, drive signals R, G and B are:
Driving signals corresponding to the red, green, and blue color signals, respectively, and the driving signal COM is a driving signal R for each of these colors.
This is a drive signal of the common electrode for G and B.

In such a camera-integrated video tape recorder 1, an IEEE (The Instit.)
ute of Electrical and Electoronics Engineers, Inc.)
The microcomputer 4 is connected to the controller 9 of the adjusting device 2 via an interface such as 1394, whereby the operation mode is switched to the adjusting mode. Further, in such an adjustment mode, the video signal SV output from the external output terminal is measured by the measuring device 10, and based on the measurement result by the measuring device 10, the controller 9 controls the microcomputer 4.
For example, by outputting various adjustment data, the signal level of the video signal SV is adjusted to a predetermined signal level by adjusting, for example, the gain of the amplifier circuit 3A that outputs the video signal SV.

On the other hand, the drive signals R, G, B, and COM of the liquid crystal display panel 7 where the signal level cannot be measured by such external output are provided in the case of the camera-integrated video tape recorder 1. The connector 11 is arranged so as to be exposed when the blind cover is removed, and is configured to be able to output to the outside via the connector 11. Thus, in the camera-integrated video tape recorder 1, the drive signals R, G, B, and COM are also measured by the dedicated measuring device 12, and based on the measurement result of the measuring device 12, the controller 9 sends the signal to the microcomputer 4. By setting the adjustment data, the gains of the amplifier circuits 8A to 8D are adjusted, and after the adjustment, the connector is covered by a blind lid.

[0007]

The connector 11 used for adjusting the drive signal is unnecessary when used as a product. If such a connector 11 can be omitted, To that extent, the overall configuration can be simplified, the space occupied by such a connector 11 can be effectively utilized, and the overall shape can be reduced in size. Also, if this kind of adjustment work can be performed without providing such a connector 11, the man-hour for connecting the measuring instrument 12 to the connector 11 can be omitted, and the entire man-hour is accordingly reduced. Can be shorter.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a display device and a display device adjusting method capable of adjusting a driving signal of a display panel without providing a dedicated connector. Is what you do.

[0009]

According to a first aspect of the present invention, there is provided a display apparatus having a switching means for outputting a drive signal to an external output terminal instead of a video signal. To

According to the fourth aspect of the present invention, the driving means is adjusted by switching a signal output from an external output terminal from a video signal to a drive signal by applying the present invention to a display device adjusting method.

According to the first aspect of the present invention, there is provided an external output terminal for adjusting a video signal by providing a switching device for outputting a drive signal to an external output terminal instead of a video signal, applied to a display device. Can also be used for output of the drive signal, whereby the drive signal of the display panel can be adjusted without providing a dedicated connector.

According to the fourth aspect of the present invention, the present invention is applied to a method of adjusting a display device, wherein a signal output from an external output terminal is switched from a video signal to a drive signal, and the drive means is adjusted, whereby the video signal is adjusted. The drive signal can be adjusted by using the external output terminal used for the adjustment of the drive signal as an output of the drive signal, thereby eliminating the need for a dedicated connector.
The drive signal of the display panel can be adjusted.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) Configuration of the Embodiment FIG. 1 is a block diagram showing a camera-integrated video tape recorder according to an embodiment of the present invention, together with its adjusting device, in comparison with FIG. In the configuration shown in FIG. 1, the same components as those in FIG.
Duplicate description is omitted.

[0015] This camera-integrated video tape recorder 2
1, the liquid crystal display unit 22 uses the driver 6 to convert the video signals SV into the drive signals R, G,
B and COM are generated, and the driving signals R, G, B and COM are amplified by the amplifier circuits 8A to 8D to drive the liquid crystal display panel 7.

Further, the liquid crystal display section 22 attenuates these drive signals R, G, B, and COM at a predetermined attenuation rate by an attenuator 23, whereby the signal levels of the drive signals R, G, B, and COM are reduced. Is corrected to a signal level corresponding to the signal level of the video signal SV. The driving signals R, G, B, and COM output from the attenuator 23 are clamped at a predetermined voltage by a subsequent clamp circuit 24, thereby correcting the DC levels of the driving signals R, G, B, and COM. Thus, the attenuator 23 and the clamp circuit 24 use the measuring device 10 that allocates the drive signals R, G, B, and COM during the video period of the video signal SV and measures the video signal SV, as described later. The amplitude and the like of the drive signals R, G, B, and COM can be measured with reference to the signal level.

The selector 25 switches the operation under the control of the microcomputer 26. In a normal operation mode, the selector 25 outputs the video signal SV output from the video signal source 3 from an external output terminal. The contact is switched at a predetermined timing, and the drive signal R, G, B or COM output from the clamp circuit 24 is output to the external output terminal instead of the video signal SV.

The selector 25 executes this contact switching process based on the horizontal synchronizing signal and the vertical synchronizing signal of the video signal SV. As a result, as shown in FIG. During the period T1 inside the drive signal, the drive signal R, G, B or COM output from the clamp circuit 24 is selectively output to the external output terminal instead of the video signal SV. Thus, in this embodiment, the drive signals R, G, B, and COM are allocated during the video period of the video signal SV, and the video signal SV is output from the external output terminal.

The microcomputer 26 is a controller for controlling the entire operation of the camera-integrated video tape recorder 21. In a normal operation mode, the microcomputer 26 responds to the operation of various controls by the user to the video signal source 3 or the like. By sending a command, recording and reproduction of an imaging result are instructed. On the other hand, in the final adjustment process, the IEEE
The E1394 interface is connected to the controller 32 of the adjusting device 31. When an operation in the adjustment mode is instructed by the controller 32, the setting of the video signal source 3 and the like is switched by various adjustment data output from the controller 32. This allows the camera-integrated video tape recorder 21 to make final adjustments to each part.

In this adjustment mode, the microcomputer 26
When the switching of the output signal by the selector 25 is instructed from the controller 32, the controller 32 instructs the output of the driving signals R, G, B, and COM at the timing described above with reference to FIG.

On the other hand, in the adjusting device 31, the controller 32 and the adjusting device 31 are connected to the camera-integrated video tape recorder 21 in the final adjusting step. Here, the measuring device 31 operates under the control of the controller 32, detects the signal level of the video signal SV or the like output from the video output terminal of the camera-integrated video tape recorder 21, and notifies the controller 32 of the signal level.

The controller 32 is a controller for controlling the operation of the adjusting device 31. The controller 32 executes the adjustment program stored in a memory (not shown) to execute the microcomputer 26 and the measuring device 1 of the camera-integrated video tape recorder 21.
0 to send and receive commands and the like, thereby controlling the operations of the camera-integrated video tape recorder 21 and the measuring device 10, and based on the measurement results obtained from the measuring device 10,
The adjustment data is output to the microcomputer 26.

FIG. 3 is a flowchart showing a processing procedure in the controller 32 in the adjustment program. Upon starting this processing procedure, the controller 32 proceeds from step SP1 to step SP2, outputs a command to the microcomputer 26, switches the operation mode of the camera-integrated video tape recorder 21 to the adjustment mode, and further via the measuring device 10. , The signal level of the video signal SV is detected. Further, based on the measurement result obtained from the measuring device 10, for example, the signal level of the video signal SV is adjusted by adjusting the gain of the amplifier circuit 3A of the video signal source 3 that outputs the video signal SV. By performing such processing, the controller 32 sets, for example, a black level, a black balance, and the like, and adjusts the video signal source 3.

After adjusting the video signal source 3 in this way, the controller 32 proceeds from step SP2 to step SP3, instructs the microcomputer 26 to switch the operation of the selector 25, and in the next step SP4, performs measurement by the measuring device 31. Get the result. The controller 32
The signal level of the drive signal is detected from the measurement result of the measuring device 31, and the adjustment data for setting the gains of the corresponding amplifier circuits 8 A to 8 D is obtained from the microcomputer 2 based on the signal level detection result.
6 is output. Thereby, the controller 32 adjusts the signal level of the corresponding drive signal to a predetermined value, and determines whether or not the adjustment has been completed for all the drive signals R, G, B, and COM in the subsequent step SP5.

If a negative result is obtained here, the controller 32 proceeds to step SP3, instructs the switching of the selector 25 to the subsequent drive signal, whereas the controller 32 proceeds to step SP3.
If a positive result is obtained in P5, the process moves to step SP6, and this processing procedure ends.

(2) Operation of the Embodiment In the above configuration, when the camera-integrated video tape recorder 1 is assembled into a finished product, it is connected to the adjusting device 31 in the final adjusting step, and the adjusting device 31
The measuring device 10 measures the signal level of the video signal SV. Further, based on the measurement result, adjustment data is output from the controller 32 to the microcomputer 26, and each part of the video signal source 3 is adjusted by the adjustment data.

On the other hand, for the liquid crystal display unit 22,
With the video signal SV output from the video signal source 3 adjusted in this way, the driver 6 drives the driving signals R, G,
B, COM are generated, and the driving signals R, G, B, CO
M drives the liquid crystal display panel 7 to output the video signal SV.
Is displayed. In the video tape recorder 1, after the drive signals R, G, B and COM are attenuated by the attenuator 23,
The signal level is clamped by the clamp circuit 24, whereby the signal level is corrected so as to be assigned to the video signal SV and measurable by the measuring instrument 31.

In the camera-integrated video tape recorder 21, when each section of the video signal source 3 is adjusted by the adjusting device 31 and the signal level of the video signal SV is adjusted, the controller 32 controls the vertical direction of the video signal SV. The contacts of the selector 25 are switched based on the synchronization signal and the horizontal synchronization signal, and drive signals R, G, B, and COM are allocated and output during the video period of a predetermined line of the video signal SV. The drive signals R, G,
B and COM are measured by the measuring device 10, and the gains of the amplifier circuits 8A to 8D are adjusted based on the measurement results.

In this way, in the camera-integrated video tape recorder 21, the external output terminal of the video signal to be used for display is also used for the output of the drive signal, whereby the drive signals R, G, B, and COM are dedicated. The drive signals R, G, B, and COM can be adjusted without providing a connector.

Therefore, in the camera-integrated video tape recorder 21, it is not necessary to provide a dedicated connector, so that the overall configuration can be simplified. And the internal space can be effectively used. In the adjustment step, the operation of removing and attaching the blind lid and the operation of connecting to the dedicated connector can be omitted, and the operation can be simplified accordingly.

(3) Effects of the Embodiment According to the above configuration, the external output terminal of the video signal to be displayed is also used as the output of the drive signal, so that the display panel can be provided without providing a dedicated connector. The drive signal can be adjusted.

At this time, during the video period of the horizontal scanning period of the video signal, a driving signal is output instead of the video signal, so that the driving signal is measured based on the horizontal synchronization signal and the vertical synchronization signal of the video signal. Can be.

Further, by providing attenuating means for attenuating the signal level of the drive signal and DC level correcting means for correcting the DC level of the drive signal, a measuring instrument for measuring the signal level of the video signal can be used for measuring the drive signal. It can be shared.

(4) Other Embodiments In the above-described embodiment, a case has been described in which a drive signal is allocated and output during a video period of a video signal. However, the present invention is not limited to this, and may be implemented as required. May be assigned to the vertical blanking period or the like, or the entire period of the video signal may be entirely replaced with the drive signal.

Further, in the above-described embodiment, the case where the present invention is applied to the adjustment of the drive signal of the liquid crystal display panel has been described. Can be widely applied to adjustment.

In the above-described embodiment, a case has been described in which the present invention is applied to a camera-integrated video tape recorder. However, the present invention is not limited to this, and an electronic device in which the video signal source is such an image pickup means. The present invention can be widely applied to a still camera and the like, and further can be widely applied to a display device having various video signal sources such as a reproducing device in which a video signal source is an optical disk device.

[0037]

As described above, according to the present invention, an external output terminal of a video signal to be used for display is also used as an output of a drive signal, so that a drive signal for a display panel can be transmitted without providing a dedicated connector. Can be adjusted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a camera-integrated video tape recorder and an adjusting device according to an embodiment of the present invention.

FIG. 2 is a signal waveform diagram for explaining the operation of the camera-integrated video tape recorder of FIG.

FIG. 3 is a flowchart illustrating a processing procedure of a controller of the adjustment device of FIG. 1;

FIG. 4 is a block diagram showing a conventional camera-integrated video tape recorder together with an adjusting device.

[Explanation of symbols]

1, 21 ... Videotape recorder with integrated camera, 2,
31 ... Adjustment device, 3 ... Video signal source, 4, 26 ...
Microcomputer, 5, 22 ... liquid crystal display unit, 6 ... driver,
7 liquid crystal display panel, 10, 12 measuring instrument, 23
... Attenuator, 24 ... Clamp circuit, 25 ... Selector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 5/14 H04N 5/14 B 5C080 F term (Reference) 2H088 FA12 FA24 HA06 MA16 MA20 2H093 NC13 NC14 NC49 NC50 ND50 ND56 NE07 5C006 AA01 EB01 EC01 FA51 5C021 PA02 PA16 PA62 XA03 XA41 XA61 5C061 BB15 CC05 5C080 AA10 BB05 DD28 EE19 JJ02 JJ04 JJ07 KK43

Claims (5)

[Claims] A video signal source that outputs a video signal; a driving unit that generates a driving signal based on the video signal to drive a display panel; an external output terminal that outputs the video signal to the outside; A display device comprising: a switching unit that outputs the drive signal to an external output terminal. 2. The image processing apparatus according to claim 1, wherein the switching unit is configured to:
The display device according to claim 1, wherein the driving signal is output instead of the video signal. 3. The switching device according to claim 1, wherein the switching unit includes an attenuation unit that attenuates a signal level of the drive signal, and a DC level correction unit that corrects a DC level of the drive signal. Display device. 4. A display device comprising: a video signal source for outputting a video signal; driving means for generating a driving signal based on the video signal to drive a display panel; and an external output terminal for outputting the video signal to the outside. The adjusting method of the display device, wherein the signal output from the external output terminal is switched from the video signal to the driving signal to adjust the precursor driving means. 5. The display device according to claim 4, wherein a signal output from said external output terminal is switched from said video signal to said drive signal during a video period in a horizontal scanning period of said video signal. Adjustment method.