JP3909033B2 - On-screen display device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an on-screen display device suitable for application to, for example, a camera-integrated video tape recorder.
[0002]
[Prior art]
In a conventional camera-integrated video tape recorder, information such as time / date / operation display or warning display is displayed on an electronic viewfinder (hereinafter referred to as “EVF”) together with an image. Some information is recorded on a video tape together with an image, or is output to the outside together with the image. On-screen display control such as displaying information such as time and date on the EVF together with the image is performed by supplying information to each of the camera unit, the video unit, and the EVF unit, for example. FIG. 3 shows a configuration example of an on-screen display device in a conventional camera-integrated video tape recorder.
[0003]
In FIG. 3, reference numeral 1 denotes a camera unit. An optical image of the subject is formed on the imaging surface of the imaging device (for example, CCD) 3 by the lens 2 of the camera unit 1. In the image sensor 3, for example, three primary color signals are formed from the optical image formed on the imaging surface. The three primary color signals are adjusted in gain by the AGC circuit 4, converted to a digital signal by the A / D converter 5, and supplied to the digital signal processing circuit 6.
[0004]
In the digital signal processing circuit 6, a luminance signal SY and a carrier color signal SC are generated from the supplied digital signal. The luminance signal SY is supplied to the adder 7, and the carrier color signal SC is supplied to the band limiting comb filter 11 of the video unit 10.
[0005]
Reference numeral 41 denotes an on-screen control signal generator (hereinafter referred to as “OSD unit”). In the OSD unit 41, a camera unit on-screen control signal SSC for displaying time, date, and the like is formed based on on-screen control data DOSD of a microcomputer (hereinafter referred to as "microcomputer") 40. The formed camera unit on-screen control signal SSC is supplied from the first output terminal 41 a of the OSD unit 41 to the adder 7. Note that the on-screen control data DOSD supplied from the microcomputer 40 to the OSD unit 41 is output according to the operation of an operation switch (not shown) or automatically output according to the operating state of the video unit or the like. .
[0006]
In the adder 7, the camera unit on-screen control signal SSC from the OSD unit 41 is added to the luminance signal SY supplied from the digital signal processing circuit 6. The luminance signal SYA obtained by the addition is supplied to the adder 13 via the AGC circuit 12 of the video unit 10.
[0007]
In the OSD unit 41, not only the camera unit on-screen control signal SSC but also a video unit on-screen control signal SSV for displaying a tape counter value, a remaining tape amount, and the like are formed. The video part on-screen control signal SSV is supplied from the second output terminal 41 b of the OSD part 41 to the adder 13.
[0008]
Therefore, the adder 13 adds the video part on-screen control signal SSV from the OSD part 41 to the luminance signal SYB supplied via the AGC circuit 12. The luminance signal SYD obtained by the addition is supplied to the synthesis circuit 14 and is also supplied to the adder 21 of the EVF unit 20.
[0009]
The synthesizing circuit 14 synthesizes the carrier color signal SC supplied via the comb filter 11 and the luminance signal SYD from the adder 13 into a video signal. The synthesized video signal is output from the video output terminal 16 via the amplifier circuit 15.
[0010]
Although not shown, when an external video signal is supplied from the video input terminal, the video part on-screen control signal SSV is added to the external video signal for processing. The recording / reproducing unit for the luminance signal SYA from the camera unit, the carrier color signal SC, or the video signal supplied from the video input terminal is omitted.
[0011]
Next, in the OSD unit 41, an EVF unit on-screen control signal SSE for displaying a warning (for example, a battery end or a tape end) is formed. The EVF unit on-screen control signal SSE is supplied from the third output terminal 41 c of the OSD unit 41 to the adder 21 of the EVF unit 20. Therefore, the adder 21 adds the EVF unit on-screen control signal SSE from the OSD unit 41 to the luminance signal SYD supplied from the adder 13 of the video unit 10. The luminance signal SYE obtained by the addition is supplied to the EVF drive processing circuit 23 via the amplifier circuit 22 and displayed on the EVF display (for example, a small cathode ray tube).
[0012]
[Problems to be solved by the invention]
By the way, the OSD unit 41 described above is composed of an IC capable of controlling three systems of on-screen display, and outputs each system of on-screen control signals from three output terminals. If screen display control is to be performed, it is necessary to change to an IC that can output four on-screen control signals. For this reason, not only the cost of the parts is increased, but it is necessary to re-create the program of the microcomputer 40 in accordance with the IC capable of controlling the four systems of on-screen display, which takes time for development.
[0013]
In addition, when a plurality of display means are used, if the on-screen control signal is generated regardless of the display operation of each display means, the on-screen control signal is also generated for the display means that are not used, and the on-screen display is efficiently performed. Control cannot be performed.
[0014]
Accordingly, the present invention provides an on-screen display device that can efficiently perform on-screen display control even when a plurality of display means are used.
[0015]
[Means for Solving the Problems]
The on-screen display device according to the present invention includes a plurality of display means, at least one of which is openable / closable, and an on-screen control corresponding to each of the plurality of display means according to the open / close state of the openable / closable display means. A display control means for selectively switching signals to be supplied from the same output unit, and a display for performing a display operation by controlling power supply to the plurality of display means according to the open / closed state of the openable / closable display means Display selection means for selecting a means and performing display based on the on-screen control signal corresponding to the display means. The display means includes an imaging means for picking up an image of a subject and generating an image signal, and the display selection means performs a display operation. The on-screen control signal corresponding to the display means, the image signal, The display based on is performed. Further, the display control means warns that the battery for supplying the power is terminated to the display means that performs the display operation by the display selection means when the openable / closable display means is closed. An on-screen control signal for displaying information including is supplied.
[0016]
[Action]
In the present invention, corresponding on-screen control signals are selectively switched and supplied from the same output unit to the plurality of display means according to the open / closed state of the display means from the display control means. Further, at least one of the plurality of display means is a display means that can be opened and closed, and the power supply to the plurality of display means is controlled in accordance with the open / closed state of the openable / closable display means to perform a display operation. A display means is selected. For example, when one of the two display means is an openable / closable display means and the openable / closable display means is closed, power is supplied to the other display means to perform a display operation. In the open state, power is supplied to the open display means to perform a display operation. Furthermore, an on-screen control signal corresponding to the display means selected to perform the display operation is output. Here, when the openable / closable display means is in an open state, an on-screen control signal corresponding to the openable / closable display means is output. Further, when the openable / closable display means is in the closed state, an onscreen control signal corresponding to the other display means, for example, an onscreen control signal for displaying information including a warning that the battery supplying power is terminated is output. Displayed on the other display means. In addition, when an imaging unit that captures an image of a subject and generates an image signal is provided, a display based on the on-screen control signal and the image signal is displayed on the display unit.
[0017]
【Example】
Hereinafter, an embodiment of an on-screen display device according to the present invention will be described with reference to the drawings. This example is applied to a camera-integrated video tape recorder, and FIG. 3 shows its appearance. This camera-integrated video tape recorder comprises a camera unit 1, a video unit 10, an EVF unit 20, and a panel display unit 30, as shown in FIG.
[0018]
The camera unit 1 and the video unit 10 are provided in the main unit of the camera-integrated video tape recorder, and the EVF unit 20 is arranged to be movable on the upper side of the main unit. Further, as shown in FIG. 1, the panel display unit 30 is disposed on the left side surface of the main body so as to be opened and closed. A lens 2 of the camera unit 1 is disposed on the front surface of the main body.
[0019]
A battery 51 for supplying power is mounted on the rear surface of the main body, and an audio / video input / output terminal for outputting an audio / video signal to the outside or inputting an audio / video signal from the outside. 52 is disposed. A recording operation switch 53 for starting or stopping recording is provided on the right side of the rear surface.
[0020]
A panel opening lever 54 is disposed on the side surface of the end of the panel display unit 30. By operating the panel opening lever 54, the panel display unit 30 is rotated from the main body unit about the panel support unit 55 and is opened. Note that an LCD panel 34 is disposed on the surface side facing the main body when the panel display unit 30 is closed, and the on-screen side is opposed to the panel display unit 30 of the main body. An operation switch unit 56 for controlling display and the like is provided.
[0021]
Next, the configuration of an embodiment of the on-screen display device according to the present invention will be described with reference to FIG. 2 corresponding to those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0022]
In FIG. 2, the luminance signal SYD output from the adder 13 of the video unit 10 is supplied not only to the adder 21 of the EVF unit 20 but also to the adder 31 of the panel display unit 30. The on-screen control signal output from the third output terminal of the OSD unit 41 is supplied to the adder 21 of the EVF unit 20 and the adder 31 of the panel display unit 30. Therefore, the adder 21 adds the on-screen control signal supplied from the OSD unit 41 to the luminance signal SYD supplied from the adder 13 of the video unit 10. The luminance signal SYE obtained by the addition is supplied to the EVF drive processing circuit 23 via the amplifier circuit 22. The adder 31 adds the on-screen control signal supplied from the OSD unit 41 to the luminance signal SYD supplied from the adder 13 of the video unit 10. The luminance signal SYF obtained by the addition is supplied to the panel drive processing circuit 33 via the amplifier circuit 32.
[0023]
The panel drive processing circuit 33 is supplied with the carrier color signal SC supplied from the digital signal processing circuit 6 of the camera unit 1 via the comb filter 11 of the video unit 10. Therefore, display is performed on the LCD panel 34 based on the luminance signal SYF and the carrier color signal SC supplied by the panel drive processing circuit 33.
[0024]
By the way, the microcomputer 40 that supplies the on-screen control data DOSD to the OSD unit 41 is supplied with a detection signal SP that indicates whether the panel display unit 30 is in the open state or the closed state.
[0025]
That is, the detection switch 42 for detecting whether the panel display unit 30 is in the open state or the closed state has one terminal connected to the power supply terminal 43 and the other terminal connected to the NPN type via the resistor 44. Connected to the base terminal of transistor 46. The base terminal and emitter terminal of the transistor 46 are connected via a resistor 45, and the emitter terminal is grounded. The collector terminal of the transistor 46 is connected to the power supply terminal 43 via the resistor 47 and to the microcomputer 40. Therefore, when the panel display unit 30 is in the closed state, the detection switch 42 is turned on, the transistor 46 is turned on, and the low level “L” detection signal SP is supplied to the microcomputer 40. When the panel display unit 30 is in the open state, the detection switch 42 is turned off, the transistor 46 is turned off, and a high level “H” detection signal SP is supplied to the microcomputer 40.
[0026]
Further, a terminal connected to the resistor 44 of the detection switch 42 is connected to the EVF power supply unit 48 and also connected to the panel power supply unit 50 via the inverter circuit 49. Therefore, when the detection switch 42 is in the ON state, a high level “H” signal is supplied to the EVF power supply unit 48 and a low level “L” signal is supplied to the panel power supply unit 50, and the EVF power supply unit 48. Power is supplied to the EVF unit 20, but no power is supplied to the panel display unit 30 from the panel power supply unit 50. Further, when the detection switch 42 is in the OFF state, a low level “L” signal is supplied to the EVF power supply unit 48 and a high level “H” signal is supplied to the panel power supply unit 50, from the EVF power supply unit 48. In this case, power is not supplied to the EVF unit 20, but power is supplied from the panel power supply unit 50 to the panel display unit 30.
[0027]
When the panel display unit 30 is in the closed state and the detection switch 42 is in the on state, the low level “L” detection signal SP is supplied to the microcomputer 40, and the microcomputer 40 performs display on the EVF unit 20. On-screen control data DOSD for this purpose is supplied to the OSD unit 41. That is, the EVF on-screen control signal SSE is supplied from the third output terminal 41 c of the OSD unit 41 to the adder 21 of the EVF unit 20 and the adder 31 of the panel display unit 30. However, as described above, since the detection switch 42 is in the ON state, power is not supplied to the panel display unit 30, and display is performed only on the EVF display 24 of the EVF unit 20 to which power is supplied.
[0028]
Further, when the panel display unit 30 is in the open state and the detection switch 42 is in the off state, the microcomputer 40 is supplied with the high level “H” detection signal SP, so that the microcomputer 40 displays the EVF unit 20 display. On-screen control data DOSD for performing different displays on the panel display unit 30 is supplied to the OSD unit 41. From the third output terminal 41 c of the OSD unit 41, the panel unit on-screen control signal SSP is supplied to the adder 21 of the EVF unit 20 and the adder 31 of the panel display unit 30. However, since the detection switch 42 is in the OFF state, power is not supplied to the EVF unit 20 and display is performed only on the LCD panel 34 of the panel display unit 30 to which power is supplied.
[0029]
As described above, according to this example, by switching and outputting two control signals from one output terminal of the OSD unit 41, four systems of on-screen display control are controlled by control signals output from the three output terminals. can do. In addition, the open / close state of the panel display unit 30 is detected, the two systems of signals are switched based on the detection result, and the power supply to the display unit to which a control signal of a different system is supplied based on the detection result is stopped. For this reason, even when two control signals are output from one output terminal, display other than the predetermined display is not performed.
[0030]
Further, even if the number of systems for on-screen display control is increased, it is possible to cope with this by switching and processing the control signals, so there is no need to change the IC along with the increase in the number of systems. For this reason, it is possible to easily cope with a change in software or the like and to configure the apparatus at a low cost.
[0031]
In this example, two on-screen control signals are switched and output from one output terminal. On-screen display control is performed by outputting more on-screen control signals from one output terminal. Of course, it can be done easily.
[0032]
【The invention's effect】
According to the present invention, a plurality of display means, at least one of which is openable / closable, and an on-screen control signal corresponding to each of the plurality of display means are selectively selected according to the open / close state of the openable / closable display means. Display control means for supplying from the same output unit, and display means for controlling the power supply to the plurality of display means according to the open / closed state of the openable / closable display means to perform a display operation. Display selection means for performing display based on the on-screen control signal corresponding to the display means is provided. For this reason, even if a plurality of display means are used, on-screen display control can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a diagram showing an external appearance of a camera-integrated video tape recorder to which an on-screen display device according to the present invention is applied.
FIG. 2 is a diagram showing a configuration of an embodiment of an on-screen display device according to the present invention.
FIG. 3 is a diagram illustrating a configuration of a conventional on-screen display device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Camera part 7, 13, 21 Adder 10 Video part 20 EVF part 24 EVF display 30 Panel display part 34 LCD panel 40 Microcomputer (microcomputer)
41 On-screen control signal generator (OSD unit)
42 Detection Switch 48 EVF Power Supply 50 Panel Power Supply 54 Panel Opening Lever 55 Panel Support

Claims (3)

A plurality of display means at least one of which is openable and closable;
Display control means for selectively switching on-screen control signals corresponding to each of the plurality of display means according to the open / closed state of the openable / closable display means and supplying from the same output unit ;
Display based on the on-screen control signal corresponding to the display means is selected by controlling the power supply to the plurality of display means according to the open / closed state of the openable / closable display means to perform a display operation. An on-screen display device, comprising: An imaging means for imaging an object and generating an image signal;
2. The on-screen display device according to claim 1, wherein the display unit configured to perform a display operation by the display selection unit performs display based on the on-screen control signal and the image signal corresponding to the display unit. Screen display device. The display control means includes a warning that the battery that supplies the power is terminated for the display means that performs the display operation by the display selection means when the openable / closable display means is closed. 2. The on-screen display device according to claim 1, wherein an on-screen control signal for displaying information is supplied.

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