KR20020022369A - Device of Liquid Crystal on Silicon - Google Patents
Device of Liquid Crystal on Silicon Download PDFInfo
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- KR20020022369A KR20020022369A KR1020000055131A KR20000055131A KR20020022369A KR 20020022369 A KR20020022369 A KR 20020022369A KR 1020000055131 A KR1020000055131 A KR 1020000055131A KR 20000055131 A KR20000055131 A KR 20000055131A KR 20020022369 A KR20020022369 A KR 20020022369A
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- 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
- G02F1/133553—Reflecting elements
- G02F1/133555—Transflectors
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- 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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- 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
- G02F1/1343—Electrodes
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- Crystallography & Structural Chemistry (AREA)
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- Liquid Crystal (AREA)
Abstract
Description
본 발명은 반사형 액정표시장치에 관한 것으로서, 특히, 반사판의 보호를 위해 상기 반사판의 상측에 형성시켜준 보호막을 공통전극의 상면에도 형성시켜 줌으로서, 기판이 상하 대칭을 이루도록 함에 따라 전계가 비대칭으로 분배되는 것을 방지하여 주고, 그에 따라 전계의 방향에 따라 플리커(flicker)가 줄어드는 효과를얻을 수 있으며, 액정 내 이온이 상하 비대칭 형태로 축적되는 현상을 줄이는 반사형 액정표시장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective liquid crystal display device. In particular, a protective film formed on the upper side of the reflecting plate to protect the reflecting plate is also formed on the upper surface of the common electrode, so that the electric field becomes asymmetrical as the substrate becomes symmetrical. The present invention relates to a reflective liquid crystal display device which can prevent the distribution of light into the liquid crystals, thereby reducing flicker depending on the direction of the electric field, and reducing the phenomenon in which ions in the liquid crystal accumulate in up and down asymmetry.
종래의 반사형 액정표시장치는 도 1에 도시한 바와 같이 상·하부기판(10·20)이 소정의 간격을 이루도록 설치되어 있고, 상기 상·하부기판(10·20)의 사이에 액정(LC)이 주입되어 밀봉된 액정층(30)으로 구성되어 있다.In the conventional reflective liquid crystal display device, as illustrated in FIG. 1, upper and lower substrates 10 and 20 are provided at predetermined intervals, and the liquid crystal LC is disposed between the upper and lower substrates 10 and 20. ) Is injected and sealed to the liquid crystal layer 30.
상기 상부기판(10)은 커버글라스(11)와, 상기 커버글라스(11)의 상측에 형성되어 액정에 전압을 인가시키는 투명전극 재료인 ITO(Indium Tin Oxide)박막이 증착된 공통전극(12)과, 상기 공통전극(12)의 상측에 형성되어 액정(LC)을 소정의 방향으로 배열시키는 배향막(13)으로 이루어져 있다.The upper substrate 10 is formed of a cover glass 11 and a common electrode 12 formed with an ITO (Indium Tin Oxide) thin film formed on the cover glass 11 to apply a voltage to the liquid crystal. And an alignment layer 13 formed on the common electrode 12 to arrange the liquid crystal LC in a predetermined direction.
상기 하부기판(20)은 상면에 매트릭스형태로 배열되어 화소전극(23b)의 역할을 겸하는 반사판(23)이 조립된 백 플랜(21)과, 상기 반사판(23)의 상측에 형성되어 상기 반사판(23)을 보호하는 보호막(25)과, 상기 보호막(25)의 상측에 설치되어 액정을 소정의 방향으로 배열시키는 배향막(27)으로 이루어져 있다.The lower substrate 20 is arranged in a matrix on an upper surface thereof, and includes a back plan 21 on which a reflecting plate 23 serving as a pixel electrode 23b is assembled, and an upper side of the reflecting plate 23. A protective film 25 for protecting 23 and an alignment film 27 provided above the protective film 25 to arrange liquid crystals in a predetermined direction.
상기 화소전극(23b)은 알루미늄으로 구성되어 반사판의 역할을 수행하도록 되어 있다.The pixel electrode 23b is made of aluminum to serve as a reflector.
이와 같이 구성된 종래의 반사형 액정표시장치는 주입된 액정에 의해 액정캐패시터를 이루게 되고, 상부기판(10)측의 공통전극(12)의 상면에 형성된 배향막(13)에 의해 또 하나의 캐패시터를 이루게 된다.In the conventional reflective liquid crystal display device configured as described above, the liquid crystal capacitor is formed by the injected liquid crystal, and another capacitor is formed by the alignment layer 13 formed on the upper surface of the common electrode 12 on the upper substrate 10 side. do.
한편, 상기 하부기판(20)은 화소전극(23b)이 배열되어 형성된 반사판(23)의 상면에 보호막(25) 및 배향막(17)에 의하여 2개의 캐패시터를 이루게 된다.On the other hand, the lower substrate 20 forms two capacitors on the upper surface of the reflective plate 23 formed by arranging the pixel electrodes 23b by the passivation layer 25 and the alignment layer 17.
그러나, 이와 같이 구성된 종래의 반사형 액정표시장치는 상술한 바와 같이 보호막(25)이 하부기판(20)쪽 즉, 반사판(23)의 상측에만 형성되어 캐패시터의 구조를 상·하 비대칭으로 형성함에 따라 전압분포가 다르게 되어 전계가 비대칭으로 분배되고, 그에 따라 화상의 깜박임 현상인 플리커(flicker)가 많이 발생되고, 또한, 액정내의 이온이 배향막의 한 쪽 표면(하부기판)쪽에 축적되는 현상이 발생한다는 문제점이 있다.However, in the conventional reflective liquid crystal display device configured as described above, the protective film 25 is formed only on the lower substrate 20, that is, the upper side of the reflecting plate 23, as described above, thereby forming the capacitor structure asymmetrically. As a result, the voltage distribution is different, so that an electric field is distributed asymmetrically, thereby generating a lot of flicker, which is a flickering phenomenon of the image, and a phenomenon in which ions in the liquid crystal accumulate on one surface (lower substrate) of the alignment layer. There is a problem.
본 발명은 상술한 문제점을 해결하기 위하여 안출 된 것으로서, 본 발명의 목적은 반사형 액정표시장치의 구조를 상하 대칭형태로 구현함에 따라 전계가 대칭으로 분배되고, 따라서, 전계의 방향에 따라 광도의 주기적 변화가 시각적으로 느껴지는 플리커(flicker)현상이 줄어드는 효과를 얻고, 또한 액정층 내 이온이 상·하비대칭 형태로 축적되는 것을 줄이는 반사형 액정표시장치를 제공하는 데 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to symmetrically distribute an electric field by implementing a structure of a reflective liquid crystal display device in a vertically symmetrical form. The present invention provides a reflection type liquid crystal display device which obtains an effect of reducing the flicker phenomenon in which the periodic change is visually felt and also reduces the accumulation of ions in the liquid crystal layer in an up-and-down asymmetry form.
이와 같이 구성된 본 발명에 의한 반사형 액정표시장치는 커버글라스와, 상기 커버글라스의 상측에 형성된 공통전극과, 상기 공통전극의 상면에 형성된 보호막과, 상기 보호막의 상면에 형성된 배향막으로 이루어진 상부기판과, 스위칭소자 및 화소전극 역할을 겸하는 반사판이 조립된 백 플랜과, 반사판의 상면에 형성된 보호막과, 상기 보호막의 상면에 형성된 배향막으로 이루어져 상기 상부기판과 소정의 간격을 두고 대응되게 설치되는 하부기판과, 상기 상부기판 및 하부기판의 사이에 봉입된 액정으로 구성된 것을 특징으로 한다.The reflective liquid crystal display device according to the present invention configured as described above includes an upper substrate including a cover glass, a common electrode formed on an upper side of the cover glass, a protective film formed on an upper surface of the common electrode, and an alignment film formed on an upper surface of the protective film. A lower planar substrate formed of a back plan in which a reflecting plate serving as a switching element and a pixel electrode is assembled, a protective film formed on an upper surface of the reflecting plate, and an alignment film formed on an upper surface of the protective film; It is characterized in that consisting of a liquid crystal encapsulated between the upper substrate and the lower substrate.
도 1은 종래의 반사형 액정표시장치의 구조를 도시한 단면도,1 is a cross-sectional view showing the structure of a conventional reflective liquid crystal display device;
도 2는 본 발명에 의한 반사형 액정표시장치의 구조를 도시한 단면도이다.2 is a cross-sectional view showing the structure of a reflective liquid crystal display device according to the present invention.
< 도면의 주요 부분에 대한 부호의 설명><Description of the reference numerals for the main parts of the drawings>
40 : 상부기판 41 : 커버글라스40: upper substrate 41: cover glass
43 : 공통전극 45 : 보호막43 common electrode 45 protective film
47 : 배향막 50 : 하부기판47: alignment layer 50: lower substrate
51 : 백 플랜 53 : 반사판51: back plan 53: reflector
55 : 보호막 56 : 배향막55 protective film 56 alignment film
LC : 액정 60 : 액정층LC: liquid crystal 60: liquid crystal layer
이하, 첨부도면 도 2를 참조하여 본 발명의 구성 및 작용을 더욱 상세히 설명하고자 한다.Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and operation of the present invention.
상기 도면에 도시된 바와 같이 본 발명에 의한 반사형 액정표시장치는 상·하부기판(40,50)과, 상기 상·하부기판(40,50)사이에 액정(LC)을 주입시켜 이루어진 액정층(60)으로 구성된다.As shown in the drawing, in the reflective LCD according to the present invention, a liquid crystal layer is formed by injecting a liquid crystal LC between upper and lower substrates 40 and 50 and the upper and lower substrates 40 and 50. It consists of 60.
상기 상부기판(40)은 커버글라스(41)와, 상기 커버글라스(41)의 상면에 형성되어 액정에 전압을 인가시키는 투명전극 재료인 ITO(Indium Tin Oxide) 박막이 증착된 공통전극(43)과, 상기 공통전극(43)의 상면에 형성되어 상기 공통전극(43)을 보호하는 보호막(45)과, 상기 보호막(45)의 상면에 형성되어 액정을 소정의 방향으로 배열시키는 배향막(47)으로 구성된다.The upper substrate 40 has a cover glass 41 and a common electrode 43 formed with an ITO thin film formed on an upper surface of the cover glass 41 to apply a voltage to the liquid crystal. And a passivation layer 45 formed on an upper surface of the common electrode 43 to protect the common electrode 43, and an alignment layer 47 formed on an upper surface of the passivation layer 45 to arrange liquid crystals in a predetermined direction. It consists of.
상기 하부기판(50)은 매트릭스(matrix)형태로 배열되어 화소전극(53b)의 역할을 겸하는 반사판(53)이 조립된 백 플랜(51)과, 상기 반사판(53)의 상측에 형성되어 상기 화소전극(53b)으로 이루어진 반사판(53)을 보호하는 보호막(55)과, 상기 보호막(55)의 상면에 형성되어 액정을 소정의 방향으로 배열시키는 배향막(56)으로 구성된다.The lower substrate 50 is arranged in a matrix form and includes a back plan 51 on which a reflecting plate 53 which serves as a pixel electrode 53b is assembled, and formed on an upper side of the reflecting plate 53. The protective film 55 which protects the reflecting plate 53 which consists of electrodes 53b, and the alignment film 56 which are formed in the upper surface of the said protective film 55, and arrange | position a liquid crystal in a predetermined direction are comprised.
상기에 있어, 상기 전극판(43)의 상면에 보호막(45)을 형성시킴에 따라 상·하부기판(40,50)이 서로 대칭을 이루도록 함에 따라 액정층(60)내에 형성되는 전계가 대칭형태를 이루며 형성되도록하여 플리커를 줄이고, 액정층(60)내 이온이 한쪽기판상에 축적되는 현상을 줄이게 된다.In the above, as the protective film 45 is formed on the upper surface of the electrode plate 43, the upper and lower substrates 40 and 50 are symmetrical with each other, so that the electric field formed in the liquid crystal layer 60 is symmetrical. Flicker is reduced to reduce the amount of ions in the liquid crystal layer 60 and is accumulated on one substrate.
다음은 상기와 같이 구성된 본 발명에 의한 반사형 액정표시장치의 작용 및 효과에 대해서 설명한다.Next, the operation and effect of the reflective liquid crystal display device according to the present invention configured as described above will be described.
먼저, 화소전극(53b) 및 공통전극(43)에 화면의 밝기에 상응하는 전압이 가해지면, 각 전극사이의 액정이 전압에 비례하는 상태 변화를 일으켜 일정량으로 들어온 광원의 빛은 액정층(60)을 통과하면서 그 양이 변조된 후 반사판(53)에서 반사되어 나가 화면의 밝기로 나타난다.First, when a voltage corresponding to the brightness of the screen is applied to the pixel electrode 53b and the common electrode 43, the light of the light source that enters a predetermined amount by causing a state change in proportion to the voltage of the liquid crystal between the electrodes is transferred to the liquid crystal layer 60. The amount is modulated and then reflected by the reflector 53 to appear as the brightness of the screen.
이와 같이 동작되는 동안 공통전극(43)의 상면에 형성된 보호막(45)에 의해 상·하부기판(40,50)이 서로 대칭을 이루게 됨에 따라 액정층(60)내에 형성되는 전계가 대칭형태로 형성된다.As the upper and lower substrates 40 and 50 are symmetrical with each other by the protective layer 45 formed on the upper surface of the common electrode 43 during the operation, the electric field formed in the liquid crystal layer 60 is formed in a symmetrical form. do.
다시 말하면, 액정층(60)을 사이에 두고 상기 상부기판(10)측은 공통전극(43)의 상면에 보호막(45) 및 배향막(47)을 형성하여 2중의 캐패시터를 이루게 되고, 하부기판(10)측 역시 반사판(53)의 상면에 보호막(55) 및 배향막(56)을 형성하여 2중의 캐패시터를 이루게 됨에 따라 상·하부기판(10,20)이 서로 대칭된 형태의 캐패시터를 갖게 되어 전압의 분포가 고르게 된다.In other words, the upper substrate 10 side with the liquid crystal layer 60 interposed therebetween forms a protective layer 45 and an alignment layer 47 on the upper surface of the common electrode 43 to form a double capacitor, and the lower substrate 10. As the protective film 55 and the alignment film 56 are formed on the upper surface of the reflecting plate 53 to form a double capacitor, the upper and lower substrates 10 and 20 have capacitors of symmetrical shapes. The distribution is even.
따라서, 액정층(60)내에 형성되는 전계가 비대칭형태로 분배되는 것을 방지함에 따라 전계의 방향에 따라 플리커가 발생되는 것을 줄이게 되고, 액정내 이온이 상·하 비대칭 형태로 축적되는 현상을 줄이게 된다.Therefore, as the electric field formed in the liquid crystal layer 60 is prevented from being distributed in an asymmetrical form, the generation of flicker in the direction of the electric field is reduced, and the phenomenon in which the ions in the liquid crystal accumulate in the up and down asymmetrical form is reduced. .
상술한 바와 같이, 본 발명에 의한 반사형 액정표시장치는 보호막을 하부기판에만 형성시켰던 종래의 구조를 개선하여 상부기판의 공통전극 위에도 보호막을형성시켜 상·하부기판이 서로 대칭된 형태의 캐패시터를 이루도록 구현함에 따라 액정층 내에 형성되는 전계가 고르게 분배되도록 하여 플리커 현상을 줄이고, 액정층 내 이온이 상하 대칭형태로 고르게 축적되게 한다.As described above, the reflective LCD according to the present invention improves the conventional structure in which the protective film is formed only on the lower substrate, thereby forming a protective film on the common electrode of the upper substrate, thereby forming a capacitor in which the upper and lower substrates are symmetrical with each other. As a result, the electric field formed in the liquid crystal layer is evenly distributed to reduce the flicker phenomenon, and the ions in the liquid crystal layer are evenly accumulated in the vertically symmetrical form.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000055131A KR20020022369A (en) | 2000-09-20 | 2000-09-20 | Device of Liquid Crystal on Silicon |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000055131A KR20020022369A (en) | 2000-09-20 | 2000-09-20 | Device of Liquid Crystal on Silicon |
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| KR20020022369A true KR20020022369A (en) | 2002-03-27 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6262333A (en) * | 1985-09-13 | 1987-03-19 | Nec Corp | Production of thin film two-terminal element type active matrix liquid crystal display device |
| JPH07230083A (en) * | 1994-02-18 | 1995-08-29 | Matsushita Electric Ind Co Ltd | Liquid crystal display element |
| JPH112841A (en) * | 1997-06-11 | 1999-01-06 | Hitachi Ltd | Liquid crystal display device |
-
2000
- 2000-09-20 KR KR1020000055131A patent/KR20020022369A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6262333A (en) * | 1985-09-13 | 1987-03-19 | Nec Corp | Production of thin film two-terminal element type active matrix liquid crystal display device |
| JPH07230083A (en) * | 1994-02-18 | 1995-08-29 | Matsushita Electric Ind Co Ltd | Liquid crystal display element |
| JPH112841A (en) * | 1997-06-11 | 1999-01-06 | Hitachi Ltd | Liquid crystal display device |
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