KR890004381B1 - Intergrated circuit for led drive - Google Patents

Intergrated circuit for led drive Download PDF

Info

Publication number
KR890004381B1
KR890004381B1 KR1019870005521A KR870005521A KR890004381B1 KR 890004381 B1 KR890004381 B1 KR 890004381B1 KR 1019870005521 A KR1019870005521 A KR 1019870005521A KR 870005521 A KR870005521 A KR 870005521A KR 890004381 B1 KR890004381 B1 KR 890004381B1
Authority
KR
South Korea
Prior art keywords
light emitting
emitting diode
circuit
transistor
driving
Prior art date
Application number
KR1019870005521A
Other languages
Korean (ko)
Other versions
KR880014507A (en
Inventor
강대봉
이욱원
Original Assignee
삼성전자 주식회사
김광호
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전자 주식회사, 김광호 filed Critical 삼성전자 주식회사
Priority to KR1019870005521A priority Critical patent/KR890004381B1/en
Publication of KR880014507A publication Critical patent/KR880014507A/en
Application granted granted Critical
Publication of KR890004381B1 publication Critical patent/KR890004381B1/en

Links

Images

Classifications

    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Led Devices (AREA)

Abstract

The integrated driving circuit used for a level indicator excites the serially disposed LEDs which are not influnced by the variations of the inducing signals. The circuit comprises the serially connected LEDs indicating the level of input signals, the differential op amp (A2) amplifying the input signals, the comparator (D2) feeding the transistor control circuit (E2), the LED driver (F2) driving the LED connected to the current source (I1), the driving LED circuit (G1) which is connected to the cathod of the serially tied LEDs.

Description

발광다이오드 구동 집적회로LED Drive Integrated Circuit

제1도는 종래의 발광다이오드 구동 시스템을 개략적으로 나타낸 블럭도.1 is a block diagram schematically illustrating a conventional light emitting diode driving system.

제2도는 본 발명의 회로를 개략적으로 나타낸 블럭도.2 is a block diagram schematically illustrating a circuit of the present invention.

제3도는 제2도의 세부 블럭도.3 is a detailed block diagram of FIG.

제4도는 제3도의 상세 회로도.4 is a detailed circuit diagram of FIG.

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

A1, A2: 입력차동증폭기, C1, C2, C3: 발광다이오드구동회로,A 1 , A 2 : input differential amplifier, C 1 , C 2 , C 3 : light emitting diode driving circuit,

B1-B3: 종래의 발광다이오드 구동시스템의 발광다이오드의 구동회로,B 1 -B 3 : The driving circuit of the light emitting diode of the conventional light emitting diode driving system,

E1-E3: 스위칭 트랜지스터를 온 오프 시키기 위한 회로,E 1 -E 3 : circuit for turning on and off the switching transistor,

G1, G2: 발광다이오드의 직렬방식 구동용 회로,G 1 , G 2 : series driving circuit of light emitting diodes,

H1: 컴퍼레이터의 기준 전압 발생회로,H 1 : reference voltage generator circuit of the comparator,

I1: 바이어스를 위한 전류 소오스 회로,I 1 : current source circuit for bias,

I2: 발광다이오드 구동용 전류 소오스 회로.I 2 : current source circuit for driving a light emitting diode.

본 발명은 발광다이오드를 직렬방식으로 구동하는 것과 발광다이오드가 신호의 크기를 따라 서서히 변화하는 현상을 제거하는 회로를 집적화 한 것에 관한 것이다.The present invention relates to driving a light emitting diode in series and integrating a circuit for eliminating a phenomenon in which the light emitting diode gradually changes with the size of a signal.

종래에 발광다이오드 구동회로에 있어서는 제 1 도의 블럭도에 도시한 바와같이 발광다이오드를 병렬로 구동하는 시스템으로 되어있어 전력소모가 중요시 되는 기기에서 발광다이오드의 갯수에 제한을 받게되며 발광다이오드의 갯수에 비례하여 전류가 증가하게 되어 있다. 또 발광다이오드가 온(ON)되는 경우에 신호의 크기에 따라서 그 밝기가 서서히 증가하게 되는 문제가 있었다.Conventionally, in the light emitting diode driving circuit, as shown in the block diagram of FIG. 1, the light emitting diodes are driven in parallel, thereby limiting the number of light emitting diodes in devices where power consumption is important. The current increases in proportion. In addition, when the light emitting diode is turned on, its brightness gradually increases with the size of the signal.

이에 본 발명에서는 상기한 문제점들을 해결하기 위하여 안출한 것으로써, 직렬방식으로 발광다이오드를 구동하는 회로 및 시스템과 컴퍼레이터의 비 이상적인 특성을 보완하여 스위칭에 이상적으로 이루어질 수 있는 회로를 집적화된 형태로 제공하는 데 목적을 두고 있다. 이하 첨부된 도면에 의하여 본 발명을 상세히 설명한다.Accordingly, the present invention has been made to solve the above problems, the integrated circuit and the circuit which can be ideal for switching by complementing the non-ideal characteristics of the circuit and the system and the comparator for driving the light emitting diode in a serial manner. The purpose is to provide. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제2도는 본 발명의 블럭도로서 그 세부블럭도는 제 3 도에 나타나 있다. 제 3 도에 있어서 블럭 D1, D2, D3는 발광다이오드를 도통시키기 위하여 입력레벨을 비교하기 위한 컴퍼레이터로서 각각 제 4 도에 도시된 D2와 동일한 구성을 가지며, E1, E2, E3는 컴퍼레이터의 비 이상적인 전달특성을 보완하여 이상적인 스위칭이 이루어지도록하는 트랜지스터 제어회로로서 각각 제 4 도에 도시된 E2와 동일한 구성을 가지며, F1, F2, F3는 발광다이오드를 구동하는 회로로서 발광다이오드 구동용 전류 소오스(I2)로부터 연결되며 제 4 도에 도시된 바와같이 각각 같은 구성을 갖는다.FIG. 2 is a block diagram of the present invention, the detailed block diagram of which is shown in FIG. 3 a block D 1, D 2, D 3 each have the same configuration as that of the D 2 shown in FIG. 4 as a comparator for comparing the input level so as to conduct a light emitting diode, E 1, E 2 in the , E 3 is a transistor control circuit that complements the non-ideal transfer characteristics of the comparator to achieve ideal switching, and has the same configuration as E 2 shown in FIG. 4, and F 1 , F 2 , and F 3 are light emitting diodes. A circuit for driving is connected to the light emitting diode driving current source I 2 and has the same configuration as shown in FIG.

G1, G2는 발광다이오드를 직렬방식으로 구동하기 위한 회로이며 가장낮은 레벨에서 도통되는 발광다이오드 구동회로(C1)를 제외하고 모든 발광다이오드 구동회로에 포함된다. 즉 발광다이오드 구동회로(C2, C3)는 각각 G1, G2를 포함하고 있으나, 발광다이오드 구동회로(C1)는 가장 낮은 레벨에서 구동되며 또한 G1, G2와 같은 발광다이오드 직렬방식 구동용 회로를 포합하지 않게된다. 그러므로 C1을 제외한 모든 발광다이오드 구동회로는 컴퍼레이터(D2)와 스위칭 트랜지스터 제어회로(F2)와 발광다이오드 구동회로(E2)와 발광다이오드 직렬방식 구동용회로(G1)로 구성되는 C2와 같은 구성을 갖게 된다.G 1 and G 2 are circuits for driving the light emitting diodes in series and are included in all light emitting diode driving circuits except for the light emitting diode driving circuit C 1 which is conducted at the lowest level. That is, the light emitting diode driving circuits C 2 and C 3 include G 1 and G 2 , respectively, but the light emitting diode driving circuit C 1 is driven at the lowest level, and the light emitting diode series such as G 1 and G 2 is provided. The circuit for driving the system is not included. Therefore, all the light emitting diode driving circuits except C 1 are composed of a comparator D 2 , a switching transistor control circuit F 2 , a light emitting diode driving circuit E 2 , and a light emitting diode series driving circuit G 1 . It has the same configuration as C 2 .

상기 산 구성을 갖는 본 발명회로의 동작을 첨부된 제 4 도의 상세회로도를 참조하여 설명하면 다음과 같다. 신호가 없거나 가장 낮은 레벨의 발광다이오드(LED A)를 온(ON)시키기에 부족한 신호가 인가될 때 D1은 오프되며 E1은 F1의 스위칭 트랜지스터(Q21)가 포화되도록하는 양의 전류를 공급하여 발광다이오드 구동용 트랜지스터(Q23)가 오프되도록 하고 이때 발광다이오드(LED A)는 도통되지 않는다.Referring to the detailed circuit diagram of the accompanying Figure 4 the operation of the present invention having the above-described acid configuration as follows. When there is no signal or insufficient signal is applied to turn on the lowest level LED A, D 1 is turned off and E 1 is a positive current that causes the switching transistor Q 21 of F 1 to be saturated. Is supplied so that the light emitting diode driving transistor Q 23 is turned off, and at this time, the light emitting diode LED A is not conductive.

적절한 레벨의 신호를 인가하여 D1이 온(ON)되는 반면 이 오프되어 스위칭 트랜지스터(Q21)이 오프상태가 되도록 하면, 전류 소오스(I2)에 의하여 공급되는 전류량의 정수배의 해당하는 전류가 발광다이오드 구동 트랜지스터(Q23)에 흐르게 되고 이때 발광다이오드(LED A)는 도통된다.When D 1 is turned ON while the appropriate level of signal is applied to turn OFF so that the switching transistor Q 21 is turned off, the corresponding current of an integer multiple of the amount of current supplied by the current source I 2 is The light emitting diode is driven through the light emitting diode driving transistor Q 23 , and the light emitting diode LED A is turned on.

발광다이오드 B(LED B)를 도통시키는 레벨의 신호가 D2에 인가되면 E2가 오프되어 F2의 스위칭 트랜지스터(Q12)가 오프상태에 있게되고 발광다이오드 구동용 트랜지스터(Q14)에는 I2의 정수배의 해당하는 전류가 흐르고 이때 발광다이오드 B는 도통된다. 한편 E2가 오프되었을때 G1의 스위칭 트랜지스터(Q16)도 오프상태로 되고 트랜지스터(Q17)은 포화상태가 되어 발광다이오드 A를 구동하는 트랜지스터(Q23)가 오프되고 전류는 발광 다이오드 A와 B를 거쳐 트랜지스터(Q14)로 흐르게 된다. R1에 흐르는 전류는 E2의 트랜지스터(Q6)가 완전히 오프될때까지 Q12를 포화상태로 둔다.When a signal having a level that conducts the light emitting diode B (LED B) is applied to D 2 , E 2 is turned off so that the switching transistor Q 12 of F 2 is in an off state, and the light emitting diode driving transistor Q 14 is connected to I. A corresponding current of an integer multiple of two flows through which light emitting diode B is conducting. On the other hand, when E 2 is off, the switching transistor Q 16 of G 1 is also turned off, and the transistor Q 17 is saturated, so that the transistor Q 23 which drives the light emitting diode A is turned off and the current is the light emitting diode A. It passes through and B to transistor Q 14 . The current flowing through R 1 leaves Q 12 saturated until transistor Q 6 of E 2 is turned off completely.

발광다이오드 C(LED C)를 도통시키는 레벨의 신호가 D3에 인가되면 발광다이오드 구동회로(C3)는 상기한 발광 다이오드 구동회로(C2)의 동작과 동일한 회로동작을 수행하여 전류가 발광다이오드 A와 B와 C를 도통시키게 되며, 이하 여러개의 발광 다이오드를 직렬로 연결하여 상기한 발광다이오드 구동회로(C2)의 동작과 동일한 방법으로 직렬연결된 발광다이오드를 구동할 수 있다.When a signal having a level for conducting the light emitting diode C (LED C) is applied to D 3 , the light emitting diode driving circuit C 3 performs the same circuit operation as that of the light emitting diode driving circuit C 2 so that current is emitted. The diodes A, B, and C are connected to each other, and a plurality of light emitting diodes may be connected in series to drive light emitting diodes connected in series in the same manner as the operation of the light emitting diode driving circuit C 2 .

상기한 바와같이 본 발명에 의하면, 여러개의 발광다이오드를 직렬로 구동하는 회로 및 신호의 크기에 따라 발광다이오드의 밝기가 증가하는 현상을 제거하는 회로를 단일칩화하므로써, 이에 따라 소형오디오시스템에 신호레벨의 표시를 위하여 내장시켜도 전력소모가 크게 증가하지 않으며 신호레벨에 따라 균일한 밝기의 발광다이오드가 사용되게 되어 음향기기의 고급화 및 저 소비전력화 효과를 얻게된다.As described above, according to the present invention, a circuit for driving a plurality of light emitting diodes in series and a circuit for eliminating the phenomenon in which the brightness of the light emitting diode increases with the size of the signal are integrated into a single chip, thereby reducing the signal level in a small audio system. Power consumption does not increase significantly even if it is embedded for the display of, and the light emitting diode of uniform brightness is used according to the signal level, so that the effect of high-quality and low power consumption of the acoustic device is obtained.

Claims (3)

발광다이오드를 직렬로 연결하여 구동하는 레벨표시회로에 있어서, 직렬연결된 수개의 발광다이오드와 입력차동증폭기(A2) 사이에, 바이어스를 위한 전류 소오스회로(I1)로부터 컴퍼레이터(D2)를 연결하고, 컴퍼레이터(D2)의 출력단에 트랜지스터 제어회로(E2)를 연결하며, 트랜지스터 제어회로(E2)에 의하여 전류 소오스(I2)에 연결된 발광다이오드 구동회로(F2)와 직렬방식 구동회로(G1)를 연결하여 입력차동증폭기(A2)로부터 각 발광다이오드의 캐소우드로 연결하는 것을 특징으로 하는 발광다이오드 구동 집적회로.A level display circuit which drives by connecting a light emitting diode in series, between a number of series-connected light emitting diodes and the input differential amplifier (A 2), a comparator (D 2) from the current source circuit (I 1) for biasing The transistor control circuit E 2 to the output terminal of the comparator D 2 and in series with the light emitting diode driving circuit F 2 connected to the current source I 2 by the transistor control circuit E 2 . A light emitting diode driving integrated circuit comprising a method driving circuit (G 1 ) is connected to the cathode of each light emitting diode from the input differential amplifier (A 2 ). 제1항에 있어서, 발광다이오드 구동회로(F2)는 차동증폭용 트랜지스터(Q12, Q13)와 다알링톤 접속 트랜지스터(Q10, Q11)와 전원인가 트랜지스터(Q9)와 스위칭용 트랜지스터(Q14) 및 저항(R3, R4)의 조합으로 이루어지는 것을 특징으로 하는 발광다이오드 구동 집적회로.2. The light emitting diode driving circuit (F 2 ) according to claim 1, wherein the light emitting diode driving circuit (F 2 ) has a differential amplifying transistor (Q 12 , Q 13 ), a multi-arlington connecting transistor (Q 10 , Q 11 ), a power supply transistor (Q 9 ), and a switching transistor. A light emitting diode driving integrated circuit comprising a combination of (Q 14 ) and resistors (R 3 , R 4 ). 제1항에 있어서, 직렬방식 구동회로(G1)는 전원인가 트랜지스터(Q15)와 스위칭용 트랜지스터(Q16)와 제어신호 발생 트랜지스터(Q17) 및 저항(R5-R7)의 조합으로 이루어지는 것을 특징으로 하는 발광다이오드 구동 집적회로.2. The series driving circuit G 1 is a combination of a power supply transistor Q 15 , a switching transistor Q 16 , a control signal generation transistor Q 17 , and a resistor R 5 -R 7 . A light emitting diode driving integrated circuit comprising a.
KR1019870005521A 1987-05-30 1987-05-30 Intergrated circuit for led drive KR890004381B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019870005521A KR890004381B1 (en) 1987-05-30 1987-05-30 Intergrated circuit for led drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019870005521A KR890004381B1 (en) 1987-05-30 1987-05-30 Intergrated circuit for led drive

Publications (2)

Publication Number Publication Date
KR880014507A KR880014507A (en) 1988-12-24
KR890004381B1 true KR890004381B1 (en) 1989-10-31

Family

ID=19261854

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019870005521A KR890004381B1 (en) 1987-05-30 1987-05-30 Intergrated circuit for led drive

Country Status (1)

Country Link
KR (1) KR890004381B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100714277B1 (en) * 2006-07-12 2007-05-11 주식회사 인스모바일 A serial connection-typed led module for level meter and level meter thereby

Also Published As

Publication number Publication date
KR880014507A (en) 1988-12-24

Similar Documents

Publication Publication Date Title
US4743897A (en) LED driver circuit
KR910005362B1 (en) Display driver
US7408384B2 (en) Drive circuit of computer system for driving a mode indicator
JP2003100472A (en) Driving equipment for light emitting diode
TW201408127A (en) Light emitting diode driving apparatus
US4198629A (en) Numerical display using plural light sources and having a reduced and substantially constant current requirement
TWI594664B (en) Light-emitting diode driving device and short protection method for driving device
KR101243144B1 (en) driving circuit of LED driver for LCD panel
US7327165B2 (en) Drive circuit of computer system for driving a mode indicator
US4201039A (en) Numerical display using plural light sources and having a reduced and substantially constant current requirement
KR890004381B1 (en) Intergrated circuit for led drive
JPS5997258A (en) Multiple level communication circuit for communicating digital signal between integrated circuit
JPH0576792B2 (en)
JPS6118231A (en) Driving circuit of light emitting element
JPH05129665A (en) Led drive circuit
US10537008B2 (en) Universal method for driving LEDs using high voltage
US11785684B2 (en) Light apparatus with parallel-arranged LEDs and per-LED drivers
TWI479951B (en) Light device and light driver circuit thereof
US3656142A (en) Switching circuit for luminous display tubes
KR900010907Y1 (en) Static current led driving circuit
KR200149019Y1 (en) Led driving circuit
GB2162399A (en) LED modulator
JPS592031B2 (en) display control device
JPS58215693A (en) Light emitting diode lighting system
SU369400A1 (en) DEVICE DISPLAY INFORMATION

Legal Events

Date Code Title Description
A201 Request for examination
N231 Notification of change of applicant
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20040331

Year of fee payment: 16

LAPS Lapse due to unpaid annual fee