KR200166233Y1 - Temperature compensating circuit for liquid crystal display driving - Google Patents
Temperature compensating circuit for liquid crystal display driving Download PDFInfo
- Publication number
- KR200166233Y1 KR200166233Y1 KR2019940027900U KR19940027900U KR200166233Y1 KR 200166233 Y1 KR200166233 Y1 KR 200166233Y1 KR 2019940027900 U KR2019940027900 U KR 2019940027900U KR 19940027900 U KR19940027900 U KR 19940027900U KR 200166233 Y1 KR200166233 Y1 KR 200166233Y1
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- liquid crystal
- crystal display
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- temperature
- transistor
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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
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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- Crystallography & Structural Chemistry (AREA)
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
이 고안은 액정 디스플레이 구동용 온도 보상 회로에 관한 것으로서, 종래에는 온도에 따라 액정 디스플레이의 구동 전압이 변화하여 화면이 진해지거나 흐려지는 단점이 있었으나 온도에 따라 액정 디스플레이의 구동전압을 자동으로 변화시켜 주는 온도 보상 회로를 제공하여 액정 디스플레이의 온도의존성을 극복하게 하는 액정 디스플레이 구동용 온도 보상 회로에 관한 것이다.This invention relates to a temperature compensating circuit for driving a liquid crystal display. In the related art, a driving voltage of a liquid crystal display changes depending on temperature, thereby making the screen darker or blurred. A temperature compensation circuit for driving a liquid crystal display which provides a compensation circuit to overcome the temperature dependency of the liquid crystal display.
Description
제1도는 이 고안의 실시예에 따른 액정 디스플레이 구동용 온도 보상회로이다.1 is a temperature compensation circuit for driving a liquid crystal display according to an embodiment of the present invention.
제2도는 이 고안의 실시예에 따른 온도별 액정 디스플레이 구동전압예이다.2 is an example of temperature-specific liquid crystal display driving voltage according to an embodiment of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
RTH: Thermistor R1, R2, R3 : ResistorR TH : Thermistor R1, R2, R3: Resistor
Tr: TransistorT r : Transistor
이 고안은 액정 디스플레이 구동용 온도 보상회로에 관한 것으로서, 더욱 상세하게 말하자면 액정 디스플레이의 온도변화에 따라 구동 전압을 변화시키는 액정 디스플레이 구동용 온도 보상 회로에 관한 것이다.The present invention relates to a temperature compensating circuit for driving a liquid crystal display, and more particularly, to a temperature compensating circuit for driving a liquid crystal display that changes a driving voltage according to a temperature change of a liquid crystal display.
종래에는 온도에 따라 액정 디스플레이의 구동전압이 변화하여 화면이 진해지거나 흐려지는 단점이 있었다.In the related art, the driving voltage of the liquid crystal display is changed according to temperature, so that the screen is darkened or blurred.
따라서 이 고안의 목적은 상기한 종래의 단점을 해결하기 위한 것으로서,Therefore, the object of the present invention is to solve the above disadvantages,
온도에 따라 액정 디스플레이의 구동 전압을 자동으로 변화시켜 주는 온도 보상회로를 제공하여 액정 디스플레이의 온도 의존성을 극복하는데 있다.It is to overcome the temperature dependency of the liquid crystal display by providing a temperature compensation circuit that automatically changes the driving voltage of the liquid crystal display according to the temperature.
상기한 목적을 달성하기 위한 수단으로서 이 고안의 구성은,As a means for achieving the above object, the constitution of the present invention is
회로에 전류를 공급하는 5V의 전원과, 5V의 전원과 한 단자가 직렬로 연결된 제1 저항과, 5V 전원에 한단자가 연결되어 있으며 제1 저항과 병렬로 연결되어 온도가 내려가면 저항이 커지고 온도가 올라가면 저항이 작아지는 써어미스터(Thermistor)와, 제1 저항과 써어미스터의 저항을 합한 지점에서 직렬로 한 단자가 연결된 제2 저항과, 제2 저항의 다른 한 단자와 베이스(Base) 단자가 연결되어 있고 써어미스터의 저항값 변화에 따라 전압을 가감해 주는 트랜지스터(Transistor)와, 제2 저항과 연결되어 있고 트랜지스터와 병렬로 연결된 제3 저항과, 제3 저항의 다른 한 단자와 트랜지스터의 콜렉터(Collector) 단자의 접점에 연결된, VEE와, 트랜지스터의 에미터(Emitter) 단자에 전류를 공급하는 V0로 이루어진다.A 5V power supply for supplying current to the circuit, a 5V power supply and a first resistor connected in series with one terminal, and a single terminal connected to the 5V power supply. Is increased, the thermistor whose resistance decreases, the second resistor connected in series at the point where the resistance of the first resistor and thermistor are combined, the other terminal of the second resistor and the base terminal A transistor connected to and subtracting a voltage according to a change in the thermistor's resistance, a third resistor connected to the second resistor and connected in parallel with the transistor, the other terminal of the third resistor and a collector of the transistor V EE , connected to the contacts of the (Collector) terminal, and V 0 , which supplies current to the emitter terminal of the transistor.
상기한 구성에 의하여, 이 고안이 속하는 기술분야에서 통상의 지식을 가진자가 이 고안을 용이하게 실시할 수 있는 가장 바람직한 실시예를 첨부된 도면을 참조로 하여 상세히 설명한다.By the above configuration, the most preferred embodiment that can be easily implemented by those skilled in the art to which this invention belongs will be described in detail with reference to the accompanying drawings.
제1도는 이 고안의 실시예에 따른 액정 디스플레이 구동용 온도 보상회로이다.1 is a temperature compensation circuit for driving a liquid crystal display according to an embodiment of the present invention.
제1도에 도시되어 있듯이 이 고안의 실시예에 따른 액정 디스플레이 구동용 온도 보상회로의 구성은,As shown in FIG. 1, the configuration of the temperature compensation circuit for driving the liquid crystal display according to the embodiment of the present invention is
회로에 전류를 공급하는 5V의 전원(VDD)과, 5V의 전원(VDD)과 한 단자가 직렬로 연결된 제1 저항(R1)과, 5V 전원(VDD)에 한단자가 연결되어 있으며 제1 저항(R1)과 병렬로 연결되어 온도가 내려가면 저항이 커지고 온도가 올라가면 저항이 작아지는 써어미스터(RTH: Thermistor)와, 제1 저항(R1)과 써어미스터(RTH)의 저항을 합한 지점에서 직렬로 한 단자가 연결된 제2 저항(R2)과, 제2 저항(R2)의 다른 한 단자와 베이스(Base) 단자가 연결되어 있고 써어미스터(RTH)의 저항값 변화에 따라 전압을 가감해 주는 트랜지스터(Tr ; Transistor)와, 제2 저항(R2)과 연결되어 있고 트랜지스터(Tr)와 병렬로 연결된 제3 저항(R3)과, 제3 저항(R3)의 다른 한 단자와 트랜지스터(Tr)의 콜렉터 단자의 접점에 연결된 V와, 트랜지스터(Tr)에미터 단자에 전류를 공급하는 V0로 이루어진다.5V supply for supplying a current to a circuit (V DD) and, and the one self-connected to the first resistor (R1) and a 5V power source (V DD) power supply of 5V (V DD) and the one terminal are connected in series to the The resistance of the thermistor (R TH : Thermistor) and the resistance of the first resistor (R1) and thermistor (R TH ), which are connected in parallel with the resistor (R1), become larger when the temperature decreases, and become smaller when the temperature rises. At the sum point, the second resistor R2 connected in series with one terminal, the other terminal of the second resistor R2 and the base terminal are connected, and the voltage according to the resistance value change of the thermistor R TH . A transistor (Tr) for adding or subtracting a third resistor; a third resistor (R3) connected to the second resistor (R2) and connected in parallel with the transistor (Tr); and another terminal and transistor of the third resistor (R3). V is connected to the contact of the collector terminal of (Tr) and V 0 which supplies current to the emitter terminal of the transistor (Tr).
상기한 트랜지스터(Tr)는 PNP형으로 이루어진다.The transistor Tr is of PNP type.
상기한 구성에 의한, 이 고안의 실시예에 따른 액정 디스플레이 구동용 온도 보상회로의 작용은 다음과 같다.The operation of the temperature compensation circuit for driving the liquid crystal display according to the embodiment of the present invention by the above configuration is as follows.
액정 디스플레이는 제 2도와 같이 온도에 따라 구동전압이 익스포넨셜 커브(Exponential Curve)를 그리며 변화된다. 특히 액정 디스플레이 사용시 상온에서 적당한 화면이 나오게 한 후 저온 또는 고온으로 환경이 변화되었을 때 구동 전압(상온시)의 변경이 없으면 화면이 진해지거나 흐려진다. 이를 극복하기 위해 제1도와 같은 회로를 제공하여 온도에 따라 자동으로 저온일때는 VDD-V0전압을 크게 하고 고온일 띠는 VDD-V0전압을 작게 걸어 줄 수 있게 한다.In the liquid crystal display, as shown in FIG. 2, the driving voltage changes with an exponential curve. In particular, when using a liquid crystal display, the screen is darkened or blurred if there is no change in driving voltage (at room temperature) when the environment is changed to a low temperature or a high temperature after a proper screen is displayed at room temperature. To overcome this first help automatically to provide such a circuit in accordance with the temperature is a low temperature when increasing the voltage V DD -V 0 and band-day high temperature makes it possible to reduce the line walking V DD -V 0 voltage.
이 실시예에서 사용한 써어미스터(RTH)는 저온일 경우 저항값이 커지고(상온일 때의 저항값에 비해), 고온일 경우 저항값이 작아지는 특성을 갖으며, 이러한 특성을 이용하여 R1=RTH+R2의 저항값이 온도에 따라 변화하여 고온, 상온, 저온일 경우 액정 디스플레이의 온도별 전압 변경 수치만큼 V0전압이 보상되어 인가될 수 있게 한다.The thermistor R TH used in this embodiment has a characteristic that the resistance value increases at low temperature (compared to the resistance value at room temperature), and the resistance value decreases at high temperature, and R1 = When the resistance value of R TH + R 2 changes with temperature to be high temperature, room temperature, or low temperature, the voltage V 0 may be compensated and applied as much as the voltage change value for each temperature of the liquid crystal display.
써어미스터(RTH)의 온도별 저항값 변화는 아래식으로 정의된다.Temperature change of thermistor (R TH ) is defined by the following equation.
RTH= R0E x p B(1 / T - 1 / T0)R TH = R 0 E xp B (1 / T-1 / T 0 )
* T0: 25℃의 써어미스터 저항값(298.15K)* T 0 : Thermistor resistance at 25 ℃ (298.15K)
* R0: T0K일 때의 저항값* R 0 : Resistance value at T 0 K
* B : 써어미스터의 B 정수* B: B integer of thermistor
써어미스터만으로도 온도에 따른 저항특성이 변화하지만 실제 액정 디스플레이의 온도별 특성에 맞추기 위해 R1, RTH, R2, R3을 사용, 회로를 구성하여 가장 액정 디스플레이 특성(온도별)에 근접한(미세 컨트롤이 가능)한 구동 전압 공급을 가능하게 한다.Although the thermistor alone changes the temperature-resistance characteristics, R1, R TH , R2, and R3 are used to match the actual temperature characteristics of the liquid crystal display. Enable a supply of a driving voltage.
이상에서와 같이 이 고안의 실시예에서, 액정 디스플레이의 온도 특성에 따라 자동으로 구동전압을 바꾸어 주는 효과를 가진 액정 디스플레이 구동용 온도 보상 회로를 제공할 수가 있다.As described above, in the embodiment of the present invention, it is possible to provide a liquid crystal display driving temperature compensation circuit having an effect of automatically changing the driving voltage according to the temperature characteristic of the liquid crystal display.
이 고안은 이러한 효과는 휴대용 전화기등의 액정 디스플레이를 사용한 모든 분야에서 이용될 수 있다.This design can be used in all fields using such a liquid crystal display such as a portable telephone.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019940027900U KR200166233Y1 (en) | 1994-10-25 | 1994-10-25 | Temperature compensating circuit for liquid crystal display driving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019940027900U KR200166233Y1 (en) | 1994-10-25 | 1994-10-25 | Temperature compensating circuit for liquid crystal display driving |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960015417U KR960015417U (en) | 1996-05-17 |
| KR200166233Y1 true KR200166233Y1 (en) | 2000-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019940027900U Expired - Fee Related KR200166233Y1 (en) | 1994-10-25 | 1994-10-25 | Temperature compensating circuit for liquid crystal display driving |
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| Country | Link |
|---|---|
| KR (1) | KR200166233Y1 (en) |
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1994
- 1994-10-25 KR KR2019940027900U patent/KR200166233Y1/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| KR960015417U (en) | 1996-05-17 |
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