JPS62288888A - Image display unit for cd-rom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Technical Field] The present invention relates to an apparatus for displaying image data recorded on a CD-ROM (a read-only memory consisting of a compact disc) on a color TV monitor. It is something.

[Prior art and its problems]

Recently, CD-ROMs have come into use as recording media for document data, etc., but since CD-ROMs have an extremely large storage capacity, they are also used for recording image data. However, even if image data is stored in a CD-ROM, a color CRT display for a normal computer cannot display fine color gradations, so it cannot display natural images. Store image data on CD-ROM,
If it becomes possible to display this on a normal color TV monitor, it is thought that the scope of use of CD-ROMs will be greatly expanded.

However, a simple device capable of performing the above-mentioned processing has not yet been developed.

[Means for solving problems and their effects]

In view of the above-mentioned conventional problems, the present invention provides a CD-1
? An object of the present invention is to provide an image display device for a CD-ROM that can display image data stored in an OM on a color TV monitor.

The image display device of the present invention includes a CPU board equivalent to a personal computer, and an image output board that captures and outputs image data in one screen of approximately jK.

The CPU board includes the CPU, ROM, RAM, input/output ports, and CD-ROM connected to each other via the system bus.
1? It consists of an OM interface, etc.

A CD-ROM drive is connected to the CD-ROM interface.

The image output board receives R input from the CPU board.
- an image memory unit storing at least one screen worth of digital image data each having a required gradation level;
DA converts the digital image data read from the image memory section into an analog R-G-B signal
It consists of converters, etc. The analog R-G-B signal that is directly or output from the DA converter is NTSC.
Alternatively, a color TV monitor is connected via a converter that converts it into a PAL color video composite signal.

Further, the image memory section is composed of a multi-port RAM having a parallel input/output port that can input and output signals through parallel access from the CPU, and a serial output port that can output stored contents to the DA converter through serial access. , whose parallel input/output ports are connected to the CPU board via the system bus.

This point is important when importing images from CD-ROM and color TV.
This is a major feature of the present invention in easily displaying images on a monitor.

CD-ROM set in the above CD-ROM drive
The image data within is taken into the image memory section according to a command from the CPU, and the image data is DA-converted and displayed on the color TV monitor.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In Figure 1, 11 is the CPU board, 12 is the CD
-ROM drive, 13 is an operation key, 14 is an image output board, and 15 is a color TV monitor.

The CPU board 11 includes a 16-bit CPU 21, a ROM 22 in which firmware is stored, a RAM 23, and a CD-ROM.
ROM interface 24, input/output port 25, etc.
They are interconnected via a system lot 26.

CD-ROM interface 24 has CD-1? OM
A drive 12 is connected, and an operation key 13 is connected to an input/output port 25.

The image output board 14 includes an image memory section 31 and DA converters 32a, 32b, and 32C.

Figure 2 shows the details.

The image memory unit 31 is composed of three multi-port RAMs 33a, 33b, and 33c corresponding to each color of RGB. These multi-board RAMs are
It has a capacity to store at least one screen worth of image data read from the ROM.

The image is stored as digital image data having required levels of RGB gradation. The gradation of each color of R, G, and B is 64 steps if it is 6 bits, and 256 steps if it is 8 bits.

Each multi-port RAM 33a, 33b - 33c
is a parallel input/output port 34 that can input and output signals through parallel access from the CPtJ21, and the D
It has a serial output capacitor (35) which can output stored contents to A converters 32a, 32b, and 32c by serial access. Since the image memory section 31 has a multi-port access function in this way, it can store image data read from a CD-ROM under the control of the CPU board 11, and at the same time, it can also serially output the stored contents. It can be sent to DA converters 32a, 32b, and 32C.

The DA conversion H32a, 32b, and 32c perform DA conversion on the digital image data read from the image memory section 31 to convert it into an analog RGB signal.

In FIG. 2, 41 is a video controller that synchronizes each part, and 42 is a synchronization signal control circuit for the color TV monitor 15.

Now, in the above configuration, using the operation key 13, the CD-RO
When a command is input to select a desired image from among the large number of images recorded in the CD-ROM drive 12, the firmware in the ROM 22 under the control of the CPU 21 detects it, and as a result, the command is set in the CD-ROM drive 12. C
Image data for one screen of the image is taken into the image memory section 31 from the D-ROM. Immediately thereafter, the stored image data is converted into analog R.G.B (No. 3) data by the DA converters 32a, 32b, and 32c and displayed on the color TV monitor 15.

〔Effect of the invention〕

As explained above, according to the present invention, image data recorded on a CD-ROM can be displayed on a color TV monitor as an image having a desired gradation, which is useful in fields such as various services and education. It is useful to scratch.

In particular, the image memory section of the image output board uses a multi-board RAM capable of parallel input/output and serial output, so it is possible to capture images and output the captured images to a color TV monitor extremely quickly. , it has the advantage of being compact as a whole.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an image display device for CD-ROM according to an embodiment of the present invention, and FIG. 2 is a block diagram of an image output board in the same device. 11~CPU board, 12~CD-ROM drive, 1
4-image output board, 15-color TV monitor, 21-
CPU, 22~ROM, 23~RAM, 24~CD-R
OM interface, 25 - input/output port, 31 - image memory section, 32a, 32b, 32cm DA converter, 33a, 33b, 33C - multiport 1-RAM, 3
4~parallel input/output port, 35~serial output port. Figure 1

Claims (1)

[Claims] CPU and ROM interconnected via a system bus
, a CPU board consisting of RAM, an input/output port, a CD-ROM interface, etc., a CD-ROM drive connected to the above-mentioned CD-ROM interface, and a floor of each required stage of R, G, and B input from the above-mentioned CPU board. from an image memory section that stores at least one screen worth of digital image data having a different color tone, and a DA converter that converts the digital image data read from the image memory section into an analog R/G/B signal by DA converting the digital image data read from the image memory section; The image memory section includes a parallel input/output port that can input and output signals through parallel access from the CPU;
A multi-port R that has a serial output port that can output the stored contents to the above DA converter through serial access.
AM, its parallel input/output port is connected to the CPU board via the system bus, and the image data stored in the CD-ROM set in the CD-ROM drive is transferred to the image data according to instructions from the CPU. An image display device for a CD-ROM, which captures image data into a memory section and displays image data captured into the image memory section on a color TV monitor connected to the image output board.