KR890004305B1 - Detecting system of liquid crystal indicating equipment - Google Patents

Detecting system of liquid crystal indicating equipment Download PDF

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Publication number
KR890004305B1
KR890004305B1 KR1019870000668A KR870000668A KR890004305B1 KR 890004305 B1 KR890004305 B1 KR 890004305B1 KR 1019870000668 A KR1019870000668 A KR 1019870000668A KR 870000668 A KR870000668 A KR 870000668A KR 890004305 B1 KR890004305 B1 KR 890004305B1
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South Korea
Prior art keywords
liquid crystal
counter
circuit
output
crystal display
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KR1019870000668A
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Korean (ko)
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KR880009279A (en
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심갑수
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삼성전관 주식회사
김정배
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere

Abstract

The circuit checking both of short-circuit and open-circuit of a LCD comprises the clock generator (10) producing 30-300Hz clock signals, the binary counter (20) having 7-bits, the slider switch (40) switching the output of the counter (20), the pulse encoding circuit (30) converting the binary data of the counter into the BCD codes for displaying on the LCD device (60) via the analog multiplexer (50) selecting an appropriate voltage level.

Description

액정표시 소자 검사장치LCD display device

제1도는 본 발명의 회로도이다.1 is a circuit diagram of the present invention.

제2도는 본 발명의 회로에서 출력되는 콤먼신호와 세그먼트신호의 파형도이다.2 is a waveform diagram of a common signal and a segment signal output from the circuit of the present invention.

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

10 : 클럭발생기 20 : 카운터10: clock generator 20: counter

30 : 펄스엔코딩회로 40 : 슬라이더스위치30: pulse encoding circuit 40: slider switch

50 : 아날로그멀티플렉스 60 : 액정표시소자50: analog multiplex 60: liquid crystal display device

본 발명은 제조완성된 액정표시소자의 이상여부를 검사하는 장치에 관한 것이다.The present invention relates to an apparatus for inspecting abnormality of a manufactured liquid crystal display device.

종래에는 세그먼트형 액정표시소자를 제조한 다음, 다음공정인 전기적 성능검사시 전면표시되도록 하는 구동회로였기 때문에 I.T.O전극의 단선(open)검사는 가능하나 단락(short)검사는 불가능하였다.In the related art, since a segment type liquid crystal display device was manufactured and then a driving circuit for displaying the entire surface during the next electrical performance test, an open test of the I.T.O electrode was possible, but a short test was not possible.

따라서, 본 발명의 목적은 상기한 결점을 해결하기 위한 것으로서, 2, 5 또는 8등의 특정숫자를 표시하게 하여 완성된 액정표시소자 전극의 단선 및 단락을 정확하게 파악할 수 있는 검사장치를 제공하는데 있다.Accordingly, an object of the present invention is to solve the above-described drawbacks, and to provide an inspection device capable of accurately detecting disconnection and short circuit of the completed liquid crystal display device electrode by displaying specific numbers such as 2, 5 or 8, and the like. .

이하 첨부도면에 의거하여 본 발명의 실시예를 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제1도는 본 발명의 회로도로서, 설정된 시정수에 의한 30-300Hz의 주파수를 발생하는 클럭발생기(20)와, 7비트의 데이터를 출력하는 2진 카운터(20)와, 슬라이더스위치(40)의 전환에 따라 카운터(20)에서 출력되어 인가한 데이터를 출력시키는 펄스엔코딩회로(30)와, 입력신호의 서로 다른 레벨의 전압중 하나를 선택하여 출력시켜서 액정표시소자(60)에 인가되도록 하는 아날로그 멀티플렉스(50)로 구성된다.1 is a circuit diagram of the present invention, which includes a clock generator 20 for generating a frequency of 30-300 Hz by a set time constant, a binary counter 20 for outputting 7 bits of data, and a slider switch 40. The pulse encoding circuit 30 outputs the data applied by the counter 20 according to the switching, and an analog for selecting and outputting one of voltages of different levels of the input signal to be applied to the liquid crystal display device 60. It consists of a multiplex 50.

제2도는 출력신호가 소정듀티비(1/2)를 가질때 아날로그 멀터플렉스(50)에서 출력되는 콤먼신호와 세그먼트 신호의 파형도로서 본 발명의 회로동작과 아울러 설명한다.FIG. 2 is a waveform diagram of a common signal and a segment signal output from the analog multerplex 50 when the output signal has a predetermined duty ratio 1/2, which will be described together with the circuit operation of the present invention.

먼저, 클럭발생기(10)에서 저항과 콘덴서에 의해 결정된 시정수에 의해 30 내지 300Hz 주파수를 갖는 클럭을 발생시켜서 카운터(20)를 동기시키면 2진 카우터(20)에서는 7비트의 데이터 즉, 7자리의 데이터가 출력되어서 펄스엔코딩회로(30)에 인가되는데, 이때 펄스엔코딩회로(30)는 상기의 입력데이터를 인가하여 소정의 데이터로 변환시킨다.First, the clock generator 10 generates a clock having a frequency of 30 to 300 Hz by a time constant determined by a resistor and a capacitor, and synchronizes the counter 20. In the binary counter 20, 7 bits of data, that is, 7 The digit data is output and applied to the pulse encoding circuit 30. At this time, the pulse encoding circuit 30 applies the above input data to convert the predetermined data.

이와같이 클럭발생기(10)의 출력펄스에 의해 카운트되는 카운터(20)에서 출력되는 신호는 특정숫자에 대응하는 2진코드로서 펄스엔코딩회로(30)에 의해 10진신호로 변환된다.In this way, the signal output from the counter 20 counted by the output pulse of the clock generator 10 is converted into a decimal signal by the pulse encoding circuit 30 as a binary code corresponding to a specific number.

상기의 펄스엔코딩회로(30)에서는, 슬라이더 스위치(40)가 "온"될때, 엔코딩된 7비트신호를 출력하여, 아날로그 멀터플렉스(50)로 제공한다.In the pulse encoding circuit 30 described above, when the slider switch 40 is "on", the encoded 7-bit signal is output and provided to the analog multiplexer 50.

상기의 아날로그 멀터플렉스(50)는 자체의 두개의 제어라인에 의해서 서로 다른 레벨의 전압중 하나를 선택해서 출력하게 되는 통상적인 회로인 것이다. 구체적으로는, 상기의 멀티플렉스(50)에 입력되는 7비트의 엔코딩신호가 멀티플렉싱되어 액정표시소자(60)로 제공되는데, 즉 상기의 입력신호들을 선택해서 소정의 신호가 액정표시소자의 콤먼단자 및 세그먼트단자로 제공되는 것이다.The analog multiplexer 50 is a conventional circuit that selects and outputs one of voltages of different levels by its two control lines. Specifically, the 7-bit encoded signal input to the multiplex 50 is multiplexed and provided to the liquid crystal display device 60. That is, a predetermined signal is selected by selecting the input signals and the common terminal of the liquid crystal display device. And segment terminals.

상기에서, 슬라이더 스위치(40)는 펄스 엔코딩회로(30)에 입력되는 데이터를 유지시키는 기능을 수행하기 때문에 상기의 스위치(40)가 "온"되었을 경우 상기의 입력신호를 엔코딩한 비트신호가 동시에 아날로그 멀티플렉스(50)로 제공되게 하는 회로이다.Since the slider switch 40 performs a function of holding data input to the pulse encoding circuit 30, when the switch 40 is "on", the bit signal encoding the input signal simultaneously Circuitry provided to the analog multiplex 50.

상기의 액정표시소자(60)의 콤먼단자 및 세그먼트단자로 제공되는 신호는 제2도에 도시되어 있는 바와같이 COM1, COM2로 예시된 콤먼신호와 SEG1, SEG2, SEG3 및 SEG4로 예시된 세그먼트신호이다.The signals provided to the common terminal and the segment terminal of the liquid crystal display device 60 are common signals exemplified by COM1 and COM2 and segment signals exemplified by SEG1, SEG2, SEG3 and SEG4, as shown in FIG. .

상기의 콤먼신호와 세그먼트신호의 전압파형의 결합으로 액정표시소자의 각 세그먼트의 온, 오프가 제어되는 것이다.By combining the common waveform and the voltage waveform of the segment signal, the on and off of each segment of the liquid crystal display is controlled.

즉, 상기의 아날로그 멀티플렉스(50)에서 출력되는 신호는 설정된 숫자 또는 슬라이더 스위치(40)를 "온"시킬때 고정되는 숫자에 상응하는 콤먼신호 및 세그먼트신호로서 출력되기 때문에 액정표시소자를 구동하는 것이다.That is, since the signal output from the analog multiplex 50 is output as a common signal and a segment signal corresponding to a set number or a fixed number when the slider switch 40 is turned on, the LCD is driven. will be.

이와같이 본 발명에 의하면 액정표시소자의 전기적 검사시 소망하는 숫자를 디스플레이되게 할 수 있기 때문에 종래와 같은 8자만 디스플레이되게 하는 장치에서 기대할 수 없는 효과 즉 단락검사를 수행할 수 있다.As described above, according to the present invention, since the desired number can be displayed during the electrical inspection of the liquid crystal display, an unexpected effect, that is, a short-circuit inspection, can be performed in the apparatus for displaying only eight characters.

즉 종래의 장치는 8자만 디스플레이되기 때문에 전극이 단락(short)되었을 경우에는 이를 감지할 수가 없었다.In other words, since the conventional device displays only eight characters, it cannot detect when the electrode is shorted.

이상에서와 같이 본 발명은 소망하는 숫자를 제작완성된 액정표시소자에서 디스플레이되게 할 수 있기 때문에 단선검사뿐만 아니라 단락검사도 할 수 있는 것이다.As described above, the present invention enables the desired number to be displayed on the finished liquid crystal display device, so that not only the disconnection inspection but also the short circuit inspection can be performed.

Claims (1)

설정된 시정수에 따른 주파수를 갖는 클럭발생기(10)와, 상기한 클럭발생기(10)의 출력신호에 의해 동기 되어서 7비트의 데이터를 출력시키는 카운터(20)와, 상기한 카운터(20)의 출력신호에 인가하고 슬라이더 스위치(40)의 스위칭에 따라 출력시키는 펄스엔코딩회로(30)와, 상기한 펄스엔코딩회로(30)의 출력신호를 인가하여서 제어라인의 디코딩에 의해 서로 다른 레벨의 전압중 하나를 선택해서 액정표시소자(60)로 출력되게 하는 아날로그멀티플렉스(50)로 이루어진 것을 특징으로 하는 액정표시 소자 검사장치.A counter 20 having a frequency corresponding to a set time constant, a counter 20 for outputting 7-bit data in synchronization with the output signal of the clock generator 10, and an output of the counter 20 A pulse encoding circuit 30 which is applied to the signal and outputs according to the switching of the slider switch 40, and one of voltages having different levels by decoding the control line by applying the output signal of the pulse encoding circuit 30 described above. Liquid crystal display device inspection apparatus, characterized in that consisting of an analog multiplex (50) to be selected and output to the liquid crystal display device (60).
KR1019870000668A 1987-01-28 1987-01-28 Detecting system of liquid crystal indicating equipment KR890004305B1 (en)

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KR100963033B1 (en) * 2003-12-26 2010-06-14 엘지디스플레이 주식회사 Detector for liquid crystal display and method using the same

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