JPH11161252A - Display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To communicate a display panel with a host system. SOLUTION: When a start data X1 indicating start of communication is transmitted from a host system 1, and when a slave address data X2 having a value excepting AOH-AFH is transmitted from the host system 1, a master means 23 gives up communication because the data X2 is the value excepting the AOH-AFH. On the other hand, a computor 21 is arranged to receive the next data to control an A/D converter 24 and a storing means 22 according to a command data X3 when the command data X3 is transmitted from the host system 1, and the host system 1 confirms the command data X3 of the CPU 21 to be communicated when a stop data X5 indicating the end of communication is transmitted.

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 more particularly, to a display device that communicates with a host system via a signal cable using an INTER-IC-BUS (hereinafter referred to as an IIC bus) communication protocol.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional display device communicates between a display means 102 and a host system 101 via an IIC bus X, and controls a master means 23 for controlling IIC bus communication, and a master means. Since communication is performed with a slave that operates in accordance with the slave 23, communication with a plurality of slaves is possible according to the type of slave address that the slave has, but the slave address of the storage unit 22 that outputs display data of the display panel 25 is , A0H to AFH and a plurality of slave addresses, a switch 1 for switching between a serial clock and serial data so as not to match a slave address connected on the IIC bus.
26 was required.

[0003] Further, a conventional display device is a IIC.
Devices with bus communication means must be used,
Because of the standard protocol of the IIC bus communication, the values of the D / A converter 24 and the storage unit 22 may be inadvertently changed from outside.

[0004]

As described above, in the data communication in the conventional display device, when performing data communication with the host system, the data is used for the IIC bus communication so that the slave addresses in the IIC bus communication do not match. There is a problem that a switch for switching between serial clock and serial data is required.

Accordingly, an object of the present invention is to provide a display device for performing communication with a host system via a signal cable.

[0006]

In order to solve the above-mentioned problems, a display device according to the present invention comprises a start data indicating the start of communication, and A0H to A0H following the start data.
Based on slave address data having a value other than AFH, command data for executing a command based on the slave address data, and a command executed based on the command data, the resolution, size, position, distortion, luminance, and color of image data are determined. The status data indicating the data and the stop data indicating the end of the communication are INTER-
A host system that communicates with a general-purpose port according to the IC-BUS protocol, and start data, slave address data, command data,
A signal cable for transmitting and receiving status data and stop data, storage means for preliminarily storing parameters of status data transmitted and received by the signal cable, and a status transmitted from the host system based on the parameters stored in the storage means. A CPU for outputting resolution, size, position, distortion, luminance, and color data of the image data from the data, and a resolution, size, position, distortion, luminance, and color data of the image data output from the CPU. D / to convert to analog data
It is characterized by comprising an A-converter and display means having a display panel for displaying analog data converted by the D / A converter.

[0007]

Next, a display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram (A) and a communication protocol diagram (B) of a display device according to an embodiment of the present invention.

A display device according to an embodiment of the present invention includes a start data X1 indicating the start of communication, a slave address data X2 having a value other than A0H to AFH following the start data X1, and a command based on the slave address data X2. Command data X for executing
3. Based on the command executed by the command data X3, status data X4 indicating data of resolution, size, position, distortion, luminance, and color of the image data, and stop data X5 indicating the end of communication are transmitted on the IIC bus protocol. , The host system 1 communicating with the general-purpose port and the start data X from the host system 1
1, slave address data X2, command data X
3, a signal cable X for transmitting and receiving the status data X4 and the stop data X5, a storage means 22 in which parameters of the status data X4 transmitted and received by the signal cable X are stored in advance, and a parameter stored in the storage means 22 CPU 2 that outputs resolution, size, position, distortion, brightness, and color data of image data from status data X4 sent from host system 1.
1. A D / A converter 24 that converts resolution, size, position, distortion, luminance, and color data of image data output from the CPU 21 into analog data.
And a display panel 2 for displaying the analog data converted by the / A converter 24.

Next, the operation of the display device according to one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, when the start data X1 indicating the start of communication is transmitted from the host system 1 as shown in FIG. 1, the CPU 21 prepares for communication. When the slave address data X2 having a value other than A0H to AFH is transmitted from the host system 1, the master unit 23 abandons the communication because the slave address data X2 has a value other than A0H to AFH.

On the other hand, since the slave address data X2 is a value other than A0H to AFH, the CPU 21 prepares to receive the next data, and when the command data X3 is transmitted from the host system 1 next, the command data X2
3, the A / D converter 24 and the storage means 22 are controlled to stop data X5 indicating the end of communication.
Is transmitted, the host system 1 checks the command data X3 of the CPU 21.

Therefore, the master means 23 receives the stop data X5, whereby the communication operation is securely initialized, the reaction of the storage means 22 can be reliably suppressed, and the master system 23 can stably operate between the host system 1 and the CPU 21. Communication can be performed.

[0014]

As described above, according to the display device of the present invention, stable communication can be performed between the host system and the display panel, and the display panel is transmitted from the host system via the CPU and the A / D converter. Controls the screen size, position, distortion, brightness, color, etc., recognizes the display state of the display panel, improves the adjustment and maintenance of the display panel at the production line and service bases, and improves the general-purpose port. Cheap CP with
There is an effect that can be realized by U.

[Brief description of the drawings]

FIG. 1 is a block diagram (A) and a communication protocol diagram (B) of a display device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional display device.

[Explanation of symbols]

 Reference Signs List 1 host system 2 display means X signal cable 21 CPU 22 storage means 23 display means (master means) 24 D / A converter 25 display panel X1 start data X2 slave address data X3 command data X4 status data X5 stop data

Claims (1)

[Claims] 1. Start data indicating the start of communication, slave address data having a value other than A0H to AFH following the start data, command data for executing a command by the slave address data, and execution of the command data The status data indicating the resolution, size, position, distortion, brightness, and color data of the image data and the stop data indicating the end of communication are communicated with the general-purpose port based on the INTER-IC-BUS protocol based on the command issued. And a signal cable for transmitting and receiving start data, slave address data, command data, status data, and stop data from the host system, and a storage device for storing parameters of status data transmitted and received by the signal cable in advance. And a CPU for outputting resolution, size, position, distortion, luminance, and color data of the image data from the status data sent from the host system based on the parameters stored in the storage means. A D / A converter for converting the resolution, size, position, distortion, luminance, and color data of the output image data into analog data, and a display panel for displaying the analog data converted by the D / A converter. A display device comprising: a display unit having: