JPH1049109A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device provided with a liquid crystal module control circuit suitable even for a liquid crystal module of a different control system. SOLUTION: The liquid crystal display device 10 is constituted of the liquid crystal module 12, a backlight unit 16 containing an inverter 14, a signal processing unit 18 controlling the operation of the liquid crystal module 12 and backlight unit 16 and a power source unit 20 supplying power to respective units of the liquid crystal display device 10. The signal processing unit 18 is provided with a main CPU 22 and a liquid crystal module controlling exclusive IC 24 having both control circuits of a serial communication control system and a parallel communication control system and controlling the operation of the liquid crystal module by either system according to the control system of the liquid crystal module based on a signal from the CPU.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device adapted to a liquid crystal module having a different control method.

[0002]

2. Description of the Related Art A liquid crystal display device comprises a liquid crystal module, a backlight unit, a signal processing unit having a CPU for controlling operations of the liquid crystal module and the backlight unit, and a power supply unit for supplying power to each unit. Be composed. The control method of the liquid crystal module differs depending on the type of the liquid crystal module, and includes a method of controlling by serial communication and a method of controlling by parallel communication. Further, the control method of the liquid crystal module differs depending on the manufacturer of the liquid crystal module, and the control method of the liquid crystal module often differs even if the liquid crystal modules of the same manufacturer have different sizes. Therefore, every time a different liquid crystal module with a different control method is used in a liquid crystal display device, software for controlling the liquid crystal module that controls the liquid crystal module in an optimal manner is developed, and a control circuit that executes the software is developed. I was making it.

[0003]

However, each time a different liquid crystal module having a different control method is employed, control software for newly developing control software according to the control method of the liquid crystal module and executing the control software is newly developed. Each time a circuit is manufactured, it takes time and labor to develop a new liquid crystal display device, and the development efficiency is extremely low and the time required for development is long. Was. Therefore, an object of the present invention is to provide a liquid crystal display device having a liquid crystal module control circuit that can be applied to liquid crystal modules of different control systems.

[0004]

In view of the above-mentioned problems, the present inventor has provided a control circuit of a serial communication control system and a parallel communication control system as a control circuit of a liquid crystal module in a signal processing unit. The present invention has been completed by focusing on controlling the operation of the liquid crystal module by selecting either the serial communication control method or the parallel communication control method according to the control method. In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal module, a backlight unit, and a CPU for controlling operations of the liquid crystal module, the backlight unit, and the like.
A liquid crystal display device having a signal processing unit having: a dedicated I / O having a control circuit for both a serial communication control method and a parallel communication control method in the signal processing unit.
C, the liquid crystal module is controlled based on a signal from the CPU by selecting either the serial communication control method or the parallel communication control method according to the control method of the liquid crystal module.

In a preferred embodiment of the present invention, the dedicated IC includes a transmission / reception control unit for controlling transmission and reception of signals by connecting to a CPU, and a baud rate generator for communicating with the transmission / reception control unit via a bus interface. , A transmission control unit, a transmission unit, a pulse generation unit, and a parallel signal generation unit. In the serial communication control system, the transmission unit, the transmission control unit, the baud rate generator, and the pulse generation unit operate, and the parallel communication control system , The parallel signal generation unit and the pulse generation unit operate.

According to the present invention, a dedicated IC is used to select either a serial communication control method or a parallel communication control method according to the control method of the liquid crystal module, and each data specified in the specification of the liquid crystal module is dedicated. By setting the IC, the operation of the liquid crystal module can be easily and optimally controlled. That is, the present invention uses a liquid crystal module control-dedicated IC to control the data length and clock of any liquid crystal module without developing new liquid crystal module control software and circuits in the liquid crystal module control. The liquid crystal module can be easily controlled simply by setting data such as the baud rate.

[0007]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 This embodiment is an embodiment of the liquid crystal display device according to the present invention. FIG. 1 is a block diagram showing the configuration of the liquid crystal display device of this embodiment, and FIG.
FIG. 2 is a block diagram showing an internal configuration of the device. The liquid crystal display device 10 according to the present invention basically controls a liquid crystal module 12, a backlight unit 16 including an inverter 14, and operations of the liquid crystal module 12 and the backlight unit 16, as shown in FIG. Signal processing unit 18
And a power supply unit 20 that supplies power to each unit of the liquid crystal display device 10. The signal processing unit 18 includes a main CPU 22, and a liquid crystal module control dedicated IC 24 (hereinafter simply referred to as a dedicated IC 24) that obtains signals from the main CPU 22 and controls the operation of the liquid crystal module 12.
Etc.).

As shown in FIG. 2, a dedicated IC 24 is connected to the main CPU 22 to control transmission and reception of signals to and from the main CPU 22, and a transmission / reception control unit 26 via a bus interface 28.
A baud rate generator 30, which communicates with the control unit, a transmission unit 32, a transmission control unit 34, a pulse generation unit 36, and a parallel signal generation unit 38. The baud rate generator 30 generates a clock signal (denoted as CLK in FIG. 2). The transmission unit 32 outputs serial data to be sent to the serial communication control type liquid crystal module 12. The transmission control unit 34 controls a transmission timing at which the transmission unit 32 transmits data to the liquid crystal module 12. The pulse generating unit 36 generates a latch signal or an enable signal (indicated as STB / EN in FIG. 2) for controlling the liquid crystal module, and sends out a signal that meets the specifications of the liquid crystal module 12. The parallel signal generating unit 38 outputs parallel data to the liquid crystal module 12 of the parallel communication control system.

As described above, the control method of the liquid crystal module can be roughly classified into a serial communication control method and a parallel communication control method. Further, the serial communication control method includes a clock synchronous mode and an asynchronous mode. Since the dedicated IC 24 of the liquid crystal display device 10 of the present embodiment is configured to be able to control all types of liquid crystal modules, it operates according to each control method of the liquid crystal module as described below.

(1) In case of the clock synchronous mode When the control method of the liquid crystal module is the clock synchronous mode, data is set from the main CPU 22 to an internal register (not shown) of the transmission / reception control unit 26 of the dedicated IC 24. Based on the set data, the transmission / reception control unit 26 transmits necessary information to each of the transmission unit 32, the transmission control unit 34, the baud rate generator 30, the pulse generation unit 36, and the parallel signal generation unit 38 via the bus interface 28. Send out. Based on this information, the parallel signal generation unit 38
Stops operation. The transmission unit 32 sets data to be transmitted to the liquid crystal module 12, and the transmission control unit 34 controls transmission timing when transmitting data to the liquid crystal module 12. The baud rate generator 30 divides the internal clock to produce a clock having an optimum baud rate,
Send to Further, the pulse generation unit 38 generates an enable signal or a latch signal for controlling the liquid crystal module and sends out a signal that meets the specifications of the liquid crystal module 12.

(2) In the case of the start-stop synchronous mode When the control method of the liquid crystal module is the start-stop synchronous mode, the main CPU 22 sets data in the internal register of the transmission / reception control unit 26 of the dedicated IC 24. Based on the set data, the transmission / reception control unit 26 passes through the bus interface 28, and transmits the transmission unit 32, the transmission control unit 34, the baud rate generator 30,
Pulse generation unit 36, parallel signal generation unit 3
8 to each unit. Based on this information,
Baud rate generator 30, pulse generation unit 3
6. The parallel signal generation unit 38 stops outputting the signal to the outside, the baud rate generator 30 divides the internal clock, generates a clock having an optimum baud rate, and sends this clock to the transmission control unit 34. The transmission control unit 34 creates data for controlling the liquid crystal module based on the clock, and
2 to the liquid crystal module 12.

(3) In the case of parallel communication control When the control method of the liquid crystal module is the parallel communication control, data is set from the main CPU 22 to an internal register of the transmission / reception control unit 26 inside the dedicated IC 24. According to the set data, the transmission / reception control unit 26 sends information to the transmission unit 32, the transmission control unit 34, the baud rate generator 30, the pulse generation unit 36, and the parallel signal generation unit 38 via the bus interface 28. . Based on this information, the transmission unit 32 and the transmission control unit 34 stop operating. The clock generated by the baud rate generator 30 is input to the pulse generation unit 36 to generate a liquid crystal module control enable signal or a latch signal. The parallel signal generation unit 38 sets data to be transmitted from the transmission / reception control unit 26 via the bus interface 28 to the liquid crystal module 12 after serial-parallel conversion of the data input thereto. The data set by the parallel signal generation unit 38 is transmitted to the liquid crystal module 12 at the timing of the liquid crystal module control enable signal or the latch signal transmitted from the pulse generation unit 36.

As described above, in this embodiment, the use of the dedicated IC 24 makes it possible to control the liquid crystal module very simply by setting data even in a liquid crystal module control specification that differs for each liquid crystal module.

[0014]

According to the structure of the present invention, a control circuit for both a serial communication control system and a parallel communication control system is provided, and the operation of the liquid crystal module is controlled by the CPU in any one of the systems according to the control system of the liquid crystal module. A dedicated IC that controls the liquid crystal module based on signals from the LCD is provided in the signal processing unit, so that even if the control specifications differ for each liquid crystal module, only the optimal data that matches the liquid crystal module can be set, and the liquid crystal is easily and optimally set. Can control the operation of the module. By using a dedicated liquid crystal module control IC inside the signal processing unit, even when developing a liquid crystal display device with a new liquid crystal module with a different configuration, it is necessary to newly develop individual liquid crystal module control software. Is eliminated, the development cost of the liquid crystal display device is greatly reduced, and the development time is shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of a liquid crystal module control dedicated IC.

[Brief description of reference numerals]

10 ... liquid crystal display device, 12 ... liquid crystal module, 14
…… Inverter, 16 …… Backlight unit, 18
…… Signal processing unit, 20… Power supply unit, 22…
... Main CPU, 24 ... I for exclusive use for liquid crystal module control
C, 26 ... transmission / reception control unit, 28 ... bus interface, 30 ... baud rate generator, 32 ...
... Sending unit, 34 ... Sending control unit,
36: a pulse generating unit, 38: a parallel signal generating unit.

Claims (2)

[Claims] 1. A liquid crystal display device comprising: a liquid crystal module; a backlight unit; and a signal processing unit having a CPU for controlling operations of the liquid crystal module and the backlight unit. And a dedicated IC having a control circuit for both the parallel communication control method and the serial communication control method or the parallel communication control method according to the control method of the liquid crystal module. A liquid crystal display device characterized in that control is performed based on a signal. 2. The dedicated IC includes: a transmission / reception control unit connected to the CPU to control signal transmission / reception; a bus interface connected to the transmission / reception control unit; a baud rate generator connected in parallel to the bus interface; A control unit,
A transmission unit, a pulse generation unit, and a parallel signal generation unit are provided. The transmission unit, the transmission control unit, the baud rate generator, and the pulse generation unit operate in the serial communication control method, and the parallel signal generation unit and the pulse generation unit operate in the parallel communication control method. 2. The liquid crystal display device according to claim 1, wherein the pulse generating unit operates.