JPH04331983A - Display device - Google Patents

Abstract

PURPOSE:To transfer data in two ways without increasing the number of signal lines between a control part and a display part by transferring image information and display panel information on a time-division basis through one signal line. CONSTITUTION:The display part 24 consists of a display panel 25, a timing converting circuit 26, and a display panel information processing circuit 28. A display control circuit 18 inputs an image signal 23 and a timing signal 22 to a timing converting circuit 26. Further, a display panel information processing circuit 28 outputs an RET signal including the panel information in response to each REQ signal at need. A two-way signal control circuit 19 operates to send and receive signal to and from a system 1.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a display device for displaying images such as characters and graphics. To provide display devices.

0002

2. Description of the Related Art An example of the configuration of a conventional display device is shown in FIG. As shown in FIG. 2(a), the display device includes an image display module 100 consisting of a display section 101C for displaying an image, drive circuits 101A and 101B for driving the display section 101C, and a Display control circuit 103 that generates image display signals and timing signals
, a control system 10 composed of a microprocessor, etc.
It consists of 5.

Specific examples of the image display module 100 include a liquid crystal display, a plasma display, an electroluminescent display, and a CRT display. The display control circuit 103 also includes a frame memory that stores images to be displayed on the display section 101C as the case may be.

Control system 105 to display control circuit 10
3 is supplied with a display control signal 104, and from the display control circuit 103, the image display module 100 is supplied with a display signal 102 consisting of a display data signal and a timing signal.

FIG. 1(b) shows a specific example of the display control signal 104. The timing signals are vertical synchronization signal (VSYNC), horizontal synchronization signal (HSYNC),
It consists of a display timing signal (DISPT) and a clock signal (SCLK). In addition, the display data signal (D
ATA), red (R), green (G), blue (B
) color signal. In some cases, the signal has multiple gradations.

On the other hand, the display signal 102 inputted from the display control circuit 103 to the image display module 100 includes a signal and timing signal of an image to be displayed on the display section 101C,
Specific examples of the image display module 100 include a liquid crystal display, a plasma display, an electroluminescent display, and a CRT display. In addition, the display control circuit 103 may control the display unit 101C depending on the case.
Contains a frame memory that stores images to be displayed.

[0007]

SUMMARY OF THE INVENTION The present invention provides a control system for a display device that enables two-way data transfer between a display section and a control section, and provides a display that is highly functional and has excellent man-machine functionality. We are in the process of providing equipment.

[0008]

[Means for solving the problem] The display section and the control section are each provided with an input/output circuit that processes at least one bit of data, and each input/output circuit is configured to allow bidirectional data communication. .

[0009]

[Operation] The input/output circuit provided in the display section and the control section processes the image signals displayed on the display panel and the display timing signals necessary for display control, and
It has two functions: a function of transferring various information signals from the display section to the control section.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the overall configuration of a display device according to the present invention. The device includes a control system 1 composed of a microprocessor, a data bus 15, and a first data signal bus 2, 9, connected to the data bus 15.
It is composed of display control circuits 3 and 10 and display modules 5 and 12, and the display control circuit 3
, 10 are connected by second data signal buses 4 and 11. The display module 5 includes a display panel 8 for displaying images, and drive circuits 6 and 7, and the display module 12 includes a display panel 15 for displaying images and drive circuits 13 and 14. Note that the display control circuits 3 and 10 may be included in the display modules 5 and 12 or the control system 1, and there is no particular limitation on the installation location. That is, any method may be used as long as it satisfies the feature of the present invention in which data can be transmitted in both directions.

The contents of the first or second data bus signal are as follows:
There are two types of signals: (1) an image signal to be displayed on the display panel and a timing signal; (2) an information signal for the display panel; and (3) print information to a printer (not shown) attached to the display panel.

The signal (1) includes, in addition to color information and gradation information, a timing signal for operating the drive circuits 6, 7 and 13, 14.

Furthermore, the signal (2) includes information signals from the display panel module sections 5 and 12. This information signal includes: (1) panel specification conditions such as the number of pixels of the display panels 8 and 15 and drive voltage conditions; (2) panel temperature and angle of the panel with respect to the operator;
(3) Usage status of the display device, such as the frequency of use of the device and the brightness of the backlight; (3) Input information from the light pen, mouse, keyboard, voice, etc. attached to the display device.

FIG. 3 shows a specific example of the embodiment shown in FIG. 18 is a display control circuit, 19 is a bidirectional signal control circuit, and 24 is a display section. The display section 24 includes a display panel 25, a timing conversion circuit 26, and a display panel information processing circuit 28. An image signal 23 and a timing signal 22 are input from the display control circuit 18 to the timing conversion circuit 26 . In addition, the display panel information processing circuit 28
The information signals 27 of (1) to (3) described above are input to the. The display panel information processing circuit 28 outputs a RET signal containing panel information for each REQ signal as necessary. The bidirectional signal control circuit 19 transmits and receives signals to and from the system 1 .

FIG. 3(b) shows that the display panel information processing circuit 2 responds to the request signal REQ from the system 1.
8 shows the timing of the information signal RET signal outputted by 8.

Note that the display control circuit 18 and the bidirectional signal control circuit 19 may be included in the display section 24, and there is no particular limitation on the installation location.

FIG. 4 shows another embodiment of the invention. 31
34 is a bidirectional signal control circuit and a display section. The display unit 34 includes a display control circuit 35 and a display panel 38, which perform display timing control and display panel information processing. The image signal 36 is input to the display panel 38, and the display control circuit 35
Display panel information 37 is input to . Bus signals 29 and 33 include image signals and display panel information. 30 and 32 are display timing signals. In this embodiment, the image signal line (signal 29) includes the image signal and display panel information processing, and as a result, dual reception of two types of signals is possible without increasing the number of signal lines. Become.

FIG. 5 shows a modification of the embodiment shown in FIG. 3, in which the display section 34 has a bidirectional signal control circuit 31. Note that integrating the bidirectional signal control circuit 31 and the display control circuit 35 is advantageous in terms of miniaturization of the device.

FIG. 6 shows the bus signal 29 shown in FIGS. 3 and 4.
Or, 33 specific configuration examples are shown. 43
, 44 are bus signal lines, and 39, 40, 41, and 42 are bidirectional control circuits. Bidirectional control circuit 39, 40, 41,
39a to 42b constituting 42 are buffer circuits, and data control signals CNT, CNT (inverted signal of CNT)
This causes the output to be in a high impedance state or a signal in the same state as the input signal. Here, the control signal to the buffer circuit is in the 'H' state, which is the same state as the input signal, and '
Suppose that it becomes a high impedance state in the L' state.

When the data control signal is in the 'H' state, display signals DATA1 and DATA2 (image signals) are transferred, and conversely, when the data control signal is in the 'L' state, information from the display panel section is transferred.

At this time, the transfer timing is performed in units of horizontal synchronization signals, as shown in FIG.

That is, the display control signal (DIST) is '
During the H' period, that is, the period when the image data signal is established, only the image data signal is transferred, and during the other periods, information from the display panel section is transferred. in this way,
By using a period other than the time for transferring image signals to transfer information from the display panel section, signals and information can be transferred without increasing the number of signal lines.

Furthermore, as shown in FIGS. 8 and 9, information may be transferred from the display panel section using the vertical retrace period TV or the horizontal retrace period TH. That is, the information transfer period from the display panel section is not particularly limited as long as it does not affect the display.

FIG. 10 shows an example of application of the present invention. 45 and 46 are bidirectional control circuits, and 47 is an information generation group that generates various information for the display panel section. The information generation group includes a plurality of information generation units 47a to 47d.

[0025]

According to the present invention, data can be transferred bidirectionally without increasing the number of signal lines between the control section and the display section, thereby making it possible to reduce the cost and improve the reliability of the device. Furthermore, since various information from the display panel section can be transferred to the control section side, it is possible to construct a high-quality display system with excellent man-machine functionality.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram of a display system according to the present invention.

FIG. 2 is a diagram illustrating an example of a display system according to the prior art.

FIG. 3 is a diagram showing a specific embodiment of the present invention.

FIG. 4 is a diagram showing a specific embodiment of the present invention.

FIG. 5 is a diagram showing a specific embodiment of the present invention.

FIG. 6 is a diagram showing a specific embodiment of the present invention.

FIG. 7 is a timing diagram showing the operation of FIG. 6;

FIG. 8 is a timing diagram showing the operation of FIG. 6;

FIG. 9 is a timing diagram showing the operation of FIG. 6;

FIG. 10 is a diagram showing a specific embodiment of the present invention.

[Explanation of symbols]

1... Control system, 3, 10... Display control circuit, 6, 7, 13, 14... Drive circuit, 8, 15... Display panel, 5, 12... Display module.

Claims (3)

[Claims] Claim 1: A display unit that displays at least an image;
In a display device comprising a control section that generates image signals etc. to the display, information between the control section and the display section includes image information displayed on the display section and a plurality of information generated on the display section. A display device characterized by a mixture of display panel information. 2. The display device according to claim 1, wherein the image information and the display panel information are transferred in a time-sharing manner through at least one signal line. 3. The display device according to claim 1, wherein the display panel information is transferred during a period when an image signal is invalid.