JPH0467092A - Multiscan type display device - Google Patents

Abstract

PURPOSE:To adjust the display position, etc., of an image automatically at the time of the switching of a video signal by reading the set value of a display parameter which is stored according to the frequency of an input video signal which is discriminated by a discriminating means and sending it out to a display control system such as a display position control circuit, etc. CONSTITUTION:A display parameter storage part 22 which are stored with various display parameters set on a simple keyboard 23 corresponding to frequencies discriminated by a frequency discriminating circuit 11 is connected to an internal bus. A control part 21 which reads the set values of the various display parameters out of the display parameter storage part 22 corresponding to the frequency discriminated by the frequency discriminating circuit 11 for input video signals and sends them out to the display control system is connected to the internal bus as well. Consequently, the display parameters can be adjusted speedily and automatically to eliminate the troublesome operation for finely adjusting them by an operator every time switching is performed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to various displays such as display positions in a multi-scan display device that can input video signals of multiple display resolutions. Concerning automatic parameter setting method.

(Prior Art) A multi-scan display device that can input video signals with multiple display resolutions identifies the frequency of a synchronization signal included in the input video signals and uses this identification. Display is performed by switching internal circuits such as a deflection circuit according to the frequency.

FIG. 2 schematically shows an example of the operating environment of such a multi-scan type display device.

Multiple types of video signals A (5
a), B (5b), C (5c), --, etc. Then, the switching device 4 selects any one of these video signals and outputs it to the multi-scan display device 3. This output video signal can be arbitrarily switched between a plurality of input video signals by a switching device 4.

When such switching to a video signal with a different display resolution is performed, for example, on the CR7 display screen 31 such as a color display monitor, the horizontal display position a and vertical display position Wb of the video 32, brightness, contrast, etc. etc. may change and become difficult to see.

Conventionally, these horizontal and vertical display positions, brightness, contrast, etc. have been manually adjusted each time, for example, by turning the volume, depending on each video signal.

(Problem to be Solved by the Invention) However, having to manually perform the various delicate adjustments described above every time the video signal is switched is a troublesome task and is inefficient.

This invention was made in view of the above-mentioned conventional circumstances, and allows for quick and automatic adjustment of the horizontal and vertical display positions of images, brightness, contrast, etc. as video signals are switched. It is an object of the present invention to provide a multi-scan display device equipped with this type of automatic display parameter setting method.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve such an object, the multi-scan type display device according to the present invention has a method for inputting multiple types of video signals having different display resolutions. A setting means that includes an identification means for identifying the frequency of a synchronization signal included in an input video signal, performs display by switching an internal circuit such as a deflection circuit, and sets display parameters such as a display position for each video signal. and storage means for storing the display parameters set by the setting means in correspondence with the frequencies identified by the identification means; The control means reads the set values of display parameters stored in the means and sends them to a display control system such as a display position control circuit.

(Function) In a multi-scan display device having such a configuration, display parameters such as display positions for multiple types of video signals having different display resolutions are set by the setting means, and these display parameters are set by the identification means. The information can be associated with the identified frequency and stored by the storage means.

Then, when the input is switched to a video signal with a different display resolution, the identification means identifies the frequency of the synchronizing signal included in the input video signal, switches the internal circuit such as a deflection circuit, and displays the signal. By the control means,
According to the identified frequency, setting values of display parameters stored in the storage means are read out and sent to a display control system such as a display position control circuit.

In this way, adjustments to the display position of the video, etc. can be quickly and automatically performed when switching the video signal.

(Embodiment) FIG. 1 shows a block diagram of main parts of a multi-scan type display device according to an embodiment to which the present invention is applied.

The multi-scan display device of this example uses a video signal consisting of five signals: R (red signal), G (green signal), B (blue signal), H (horizontal synchronization signal), and ■ (vertical synchronization signal). Color display monitor 1 with input
, and a display parameter control unit 2 that provides display parameters such as display position, brightness, and contrast to the color display monitor 1.

Inside the color display monitor 1, in response to the input of multiple types of video signals having different display resolutions, the frequency (for example, 64 KHz, 32 KHz, etc.) of a synchronization signal (for example, horizontal synchronization signal H) included in the input video signal K.H.
15.75 KHz, etc.) is provided. According to the frequency identified by this frequency identification circuit 11, the color display monitor 1
Internal circuits such as an internal deflection circuit (not shown) are switched,
For example, the image is displayed on the CRT display screen of the color display monitor 1.

A simple keyboard 23 connected to the internal bus is provided inside the display parameter control unit 2 for setting various display parameters such as horizontal and vertical display positions for each input video signal. The above parameters can be set by key input.

A display parameter storage section 22 for storing various display parameters set using the simple keyboard 23 in correspondence with frequencies identified by the frequency identification circuit 11 is also provided connected to the internal bus.

Also, vertical position register 24, horizontal position register 25,
..., etc., D/A converters 25, 26, etc. that convert the set values held in these registers into analog values, and adjust the display position etc. based on the analog values. There is a display control system inside the color display monitor 1 that includes a display position control circuit (not shown) and the like.

Furthermore, according to the frequency identified by the frequency identification circuit 11 of the input video signal, the display parameter storage unit 2
Read out the setting values of various display parameters stored in 2.
A control section 21 for sending data to the display control system is also connected to the internal bus.

Next, the operation of this embodiment device will be explained.

First, for example, the frequency of the horizontal synchronizing signal (H) (for example, 84
KHz, 32 KHz, 15.75X [3 types of z]
The simple keyboard 23 is operated under the control of the control unit 21 in the display parameter control unit 2 in advance so that the video is displayed at the optimal display position, brightness, and contrast in accordance with each of these. The setting values of the display parameters are determined and input into the unit 2. The input display parameter setting values are stored in the display parameter storage section 22 in correspondence with each frequency at that time. Note that if the display parameter storage section 22 uses, for example, an E2FROM, the parameters can be retained without being erased even when the power of the device is turned off. In this way, display parameters are set for all frequencies to be used.

Then, when the frequency of the input video signal is switched, the frequency is identified by the frequency identification circuit 11, and the deflection circuit inside the monitor 1 is switched based on this frequency. At the same time, this frequency (or an identification signal according to the frequency)
is also output to the display parameter control unit 2.

In the display parameter control unit 2, under the control of the control section 21, the setting values of various display parameters corresponding to this frequency (or the identification signal corresponding to the frequency) are read out from the display parameter storage section 22, and the setting values for vertical and horizontal It is sent to position registers 24 and 26, etc. The vertical and horizontal position registers 24 and 26, etc., hold the set values of the various display parameters that have been sent out, while the D/A converter 25
．． 27, etc., to an analog value, and provides it to a display control system (not shown) such as a display position control circuit inside the color display monitor 1.

In this way, automatic adjustment of the image based on various display parameters is performed.

In the configuration of the above-described embodiment, the simple keyboard 23 is used to set display parameters, but other setting means such as volume control may of course be used. For example, if a volume is used for setting, the analog signal value set by the volume may be A/D converted and stored in the display parameter storage section.

[Effects of the Invention] As explained in detail above, the multi-scan display device according to the present invention can improve the horizontal and vertical display of images, for example, when switching the input of multiple types of video signals with different display resolutions. Display parameters such as position, brightness, and contrast can now be quickly and automatically adjusted, eliminating the need for the troublesome effort of manually making these fine adjustments every time they are switched.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of a multi-scan type display device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an outline of an example of the operating environment of the multi-scan type display device. 1... Color display monitor 11... Frequency identification circuit 2... Display parameter control unit 21... Control section 22... Display parameter storage section 2
3... Simple keyboard 24... Vertical position register 25.27... D/A converter 26... Horizontal position register 3... Multi-scan type display device 31...
CRT surface 32... Image 4... Switching device

Claims (1)

[Claims] (1) When multiple types of video signals with different display resolutions are input, an identification means is provided to identify the frequency of the synchronization signal included in the input video signal, and the display is performed by switching internal circuits such as a deflection circuit. In a multi-scan type display device that performs multi-scan display, a setting means sets display parameters such as a display position for each video signal, and a memory stores the display parameters set by the setting means in correspondence with the frequencies identified by the identification means. means; and control means for reading display parameter setting values stored in the storage means according to the frequency identified by the identification means of the input video signal, and transmitting the set values to a display control system such as a display position control circuit. A multi-scan display device characterized by comprising: