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KR960001557Y1 - Lcd back light control circuit of plc handy loader - Google Patents

Lcd back light control circuit of plc handy loader Download PDF

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Publication number
KR960001557Y1
KR960001557Y1 KR2019910019401U KR910019401U KR960001557Y1 KR 960001557 Y1 KR960001557 Y1 KR 960001557Y1 KR 2019910019401 U KR2019910019401 U KR 2019910019401U KR 910019401 U KR910019401 U KR 910019401U KR 960001557 Y1 KR960001557 Y1 KR 960001557Y1
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KR
South Korea
Prior art keywords
circuit
lcd
plc
microprocessor
backlight
Prior art date
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KR2019910019401U
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Korean (ko)
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KR930011699U (en
Inventor
박경록
Original Assignee
엘지산전 주식회사
김희수
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Priority to KR2019910019401U priority Critical patent/KR960001557Y1/en
Publication of KR930011699U publication Critical patent/KR930011699U/en
Application granted granted Critical
Publication of KR960001557Y1 publication Critical patent/KR960001557Y1/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133612—Electrical details

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

내용 없음.No content.

Description

프로그래머블 로직 콘트롤러 핸디로더의 액정디스플레이 백라이트 자동 소멸회로Programmable Logic Controller Handy Loader Liquid Crystal Display Backlight Automatic Dissipation Circuit

제 1 도는 종래의 LCD 백라이트 회로도1 is a conventional LCD backlight circuit diagram

제 2 도는 본 고안에 따른 LCD 백라이트 자동 소멸회로도2 is a LCD backlight automatic disappearance circuit diagram according to the present invention

제 3 도는 본 고안 회로의 동작흐름도3 is an operation flowchart of the circuit of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

P1 : 마이크로 프로세서 Ql : 트랜지스터P1: Microprocessor Ql: Transistor

R : 저항 DS1 : 백라이트R: Resistor DS1: Backlight

본 고안은 PLC 핸디로더(Handy Loader)에 관한 것으로 특히 PLC의 사용자 프로그램 작성도중 일정시간이 경과후에도 키(Key)가 입력되지 않으면 LCD(액정디스플레이) 백라이트(Back Light)회로를 '오프' 시킴으로써 불필요한 전류소비를 방지하는데 적당하도록한 PLC핸디로더의 LCD 밸라이트 회로에 적용되는 것이다.The present invention relates to a PLC Handy Loader. Especially, if a key is not input even after a certain time has elapsed during the creation of a user program of the PLC, the LCD (liquid crystal display) back light circuit is turned off and unnecessary. It is applied to the LCD ball circuit of PLC Handy Loader which is suitable to prevent current consumption.

즉 본 고안은 PLC(Programmable Logic Controller)를 구성하는 CPU(연산부), 입력부, 출력부, 전원부, 메모리부, 프로그레밍부중에서 프로그레밍부의 모니터장치인 LCD의 백라이트 회로에 적용되는 것이다.That is, the present invention is applied to a backlight circuit of an LCD which is a monitor of a programmable part among a CPU (operation part), an input part, an output part, a power supply part, a memory part, and a programming part constituting a programmable logic controller (PLC).

종래의 LCD 백라이트회로는 제 1 도에서와 같이 키조작부(Kl)는 버퍼회로(Bl)와 엔코더부(El)에 연결되고 버퍼회로(Bl)는 데이타버스(D0∼D7)를 통해 마이크로 프로세서(P1)와 래치회로(Ll) 및 LCD 유니트회로(C1)에 연결되고, 또 마이크로 프로세서(P1)는 어드레스버스(A0∼A12)를 통해 엔코더부(El)와 LCD유니트회로(C1)에 연결되고, 그리고 마이크로 프로세서(P1)는 어드레스버스(A0∼A12)를 통해 엔코더부(El)와 LCD 유니트회로(C1)에 연결되고, 그리고 마이크로 프로세서(P1)는 콘트롤버스(Ca)를 통해 버퍼회로(Bl)및 엔코더부(El)와 LCD 유니트회로(C1)에 연결되는 구성이다.In the conventional LCD backlight circuit, as shown in FIG. 1, the key operation unit Kl is connected to the buffer circuit Bl and the encoder part El, and the buffer circuit Bl is connected to the microprocessor through the data buses D0 to D7. P1) and the latch circuit Ll and the LCD unit circuit C1, and the microprocessor P1 is connected to the encoder unit El and the LCD unit circuit C1 via address buses A0 to A12. The microprocessor P1 is connected to the encoder unit El and the LCD unit circuit C1 through address buses A0 to A12, and the microprocessor P1 is connected to the buffer circuit Ca through the control bus Ca. Bl) and the encoder unit El and the LCD unit circuit C1.

즉 종래의 LCD 백라이트회로는 래치회로(Ll)로부터 LCD 유니트회로(C1)로 신호를 전달하여 LCD가 백라이트 되도록 구성되어 있다.That is, the conventional LCD backlight circuit is configured to transfer the signal from the latch circuit (Ll) to the LCD unit circuit (C1) so that the LCD is backlit.

상기 구성회로의 동작상태를 보면, 키조작부(Kl)로 부터 키값이 입력되면 버퍼회로(Bl)를 통해 마이크로 프로세서(P1)로 데이타 값이 입력됨과 동시에 LCD 유니트부(C1)에 입력키값이 표시된다. 이때 LCD 유니트부 (C1)는 보다 선명한 표시를 위해 백라이트가 되는데 이백라이트는 키조작부(Kl)로 부터 키값이 입력된 때와 마이크로 프로세서(P1)로 부터 나오는 데이타버스(D0∼D7)중 데이타값(D3)이 '하이'인 동안 '온'된다. 그후 일정시간 동안 키값이 입력되지 않으면 LCD 백라이트가 '오프'되도록 되어있다.Referring to the operation state of the configuration circuit, when a key value is input from the key operation unit Kl, a data value is input to the microprocessor P1 through the buffer circuit Bl and an input key value is displayed on the LCD unit C1. do. At this time, the LCD unit (C1) is backlit for clearer display. This backlight is used when the key value is input from the key control unit (Kl) and the data value of the data bus (D0 to D7) from the microprocessor (P1). It is 'on' while (D3) is 'high'. After that, if no key value is input for a certain time, the LCD backlight is turned off.

그런데 상기와 같은 종래의 LCD 백라이트회로는 동작회로의 구성이 복잡하고 설계가 어려운 단점이 있었다.However, the conventional LCD backlight circuit as described above has a disadvantage in that the configuration of the operation circuit is complicated and difficult to design.

따라서 본 고안은 이러한 단점을 해결하기 위해 안출된 것으로서 첨부도면을 참조하여 상세히 설명하면 다음과 같다.Therefore, the present invention is devised to solve these disadvantages, and will be described in detail with reference to the accompanying drawings.

먼저 제 2 도에서 그 구성을 보면, 키조작부(Kl)는 마이크로 프로세서(P1)의 입력포트(PD0∼PD7)와 연결되고 마이크로 프로세서(P1)의 출력포트(PT)는 에이터가 접지된 트랜지스터(Ql)의 베이스와 연결되고, 트랜지스터(Ql)의 콜렉터는 저항(R)을 통해 전원(Vcc)인가되는 백라이트(DS1)와 연결되는 구성이다.First, as shown in FIG. 2, the key manipulation unit Kl is connected to the input ports P D0 to P D7 of the microprocessor P1, and the output port PT of the microprocessor P1 is connected to the ground. It is connected to the base of the transistor Ql, and the collector of the transistor Ql is connected to the backlight DS1 to which the power supply Vcc is applied through the resistor R.

상기 구성회로의 동작 상태를 제 3 도의 흐름도를 참조하여 상세히 설명하면 다음과 같다.An operation state of the configuration circuit will now be described in detail with reference to the flowchart of FIG. 3.

마이크로 프로세서(P1)의 출력포트(PT)가 '하이'가 되면 마이크로 프로세서(P1)의 출력포트(PT)와 접속되어 있는 트랜지스터(Ql)가 '온'되고 트랜지스터(Ql)가 '온'되는 순간에는 5V전원(Vcc)으로 부터 LCD 백라이트(DSI)와 저항(R)으로 전류가 흐르게되어 LCD 백라이트(DSl)가 '온'된다. 이때 저항(R)은 LCD 백라이트회로의 전류제한용으로 사용되는 저항이다.When the output port P T of the microprocessor P1 becomes 'high', the transistor Ql connected to the output port P T of the microprocessor P1 is 'on' and the transistor Ql is 'on'. At the moment, current flows from the 5V power supply (Vcc) to the LCD backlight (DSI) and the resistor (R), and the LCD backlight (DSl) is 'on'. In this case, the resistor R is a resistor used for current limiting of the LCD backlight circuit.

즉 제 3 도에서와 같이 마이크로 프로세서(P1)가 파워 '온'되는 시점과 키값이 입력되는 시점을 감시하여 만약 파워(Power)가 '온' 되어 백라이트 '온' 된후 일정시간동안 마이크로 프로세서(P1)의 키입력포트(PDO∼PDT)로 데이타값이 입력되지 않으면 출력포트(PT)를 '로우' 로 만들어서 트랜지스터(Q1)를 오프시키므로 트랜지스터(Ql)의 오픈콜렉터점(A)의 전압이 '하이' 가 되고, 따라서 이때 LCD의 백라이트(DSI)는 자동소멸된다.That is, as shown in FIG. 3, when the microprocessor P1 is powered on and the key value is input, the microprocessor P1 is monitored for a predetermined time after the power is turned on and the backlight is turned on. If the data value is not input to the key input ports (P DO to P DT ) of the circuit), the output port (P T ) is set to 'low' to turn off the transistor (Q1), so that the open collector point (A) of the transistor (Ql) The voltage becomes 'high', so the backlight (DSI) of the LCD is automatically extinguished.

따라서 본 고안은 회로구성이 간단하고 설계가 용이한 효과가 있다.Therefore, the present invention has a simple circuit configuration and easy design.

Claims (1)

(정정) PLC핸디로더의 LCD 백라이트회로에 있어서,(Correction) LCD backlight circuit of PLC handy loader, 파워 '온' 되는 시점과 키값이 입력되는 시점을 감지하여 파워가 온된 후에도 일정시간동안 키값이 입력되지 않을때 LCD 백라이트회로 '오프' 신호를 출력하는 마이크로 프로세서(P1)와,A microprocessor (P1) that detects the time when the power is 'on' and the time when the key value is input, and outputs an LCD backlight circuit 'off' signal when the key value is not input for a predetermined time even after the power is turned on; 상기 마이크로 프로세서(P1)로부터의 제어신호에 의해 스위칭동작되어 백라이트(DS1)의 구동을 제어하는 트랜지스터(Ql)를 포함하여 구성된것을 특징으로 하는 프로그래머블 로직 콘트롤러 핸디로더의 액정디스플레이 백라이트 자동 소멸회로.And a transistor (Ql) which is switched by a control signal from the microprocessor (P1) to control the driving of the backlight (DS1).
KR2019910019401U 1991-11-14 1991-11-14 Lcd back light control circuit of plc handy loader KR960001557Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019910019401U KR960001557Y1 (en) 1991-11-14 1991-11-14 Lcd back light control circuit of plc handy loader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019910019401U KR960001557Y1 (en) 1991-11-14 1991-11-14 Lcd back light control circuit of plc handy loader

Publications (2)

Publication Number Publication Date
KR930011699U KR930011699U (en) 1993-06-25
KR960001557Y1 true KR960001557Y1 (en) 1996-02-21

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Application Number Title Priority Date Filing Date
KR2019910019401U KR960001557Y1 (en) 1991-11-14 1991-11-14 Lcd back light control circuit of plc handy loader

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Publication number Publication date
KR930011699U (en) 1993-06-25

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