JPH11249132A - Reflection type liquid crystal display device - Google Patents
Reflection type liquid crystal display deviceInfo
- Publication number
- JPH11249132A JPH11249132A JP10047568A JP4756898A JPH11249132A JP H11249132 A JPH11249132 A JP H11249132A JP 10047568 A JP10047568 A JP 10047568A JP 4756898 A JP4756898 A JP 4756898A JP H11249132 A JPH11249132 A JP H11249132A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- substrate
- transparent substrate
- display device
- crystal display
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エレクトロルミネ
ッセンス（Electro Luminescence：以下、「ＥＬ」と
称する。）素子を光源として備えた反射型液晶表示装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type liquid crystal display device having an electroluminescence (EL) element as a light source.
【０００２】[0002]
【従来の技術】従来より、観察方向から入射した光を反
射させて表示を見るいわゆる反射型液晶表示装置が提案
されている。しかしながら、反射型液晶表示装置は周囲
が暗い場所では明るい表示をみることがきわめて困難で
あるという問題があった。2. Description of the Related Art Heretofore, there has been proposed a so-called reflection type liquid crystal display device for displaying a display by reflecting light incident from an observation direction. However, the reflective liquid crystal display device has a problem that it is extremely difficult to see a bright display in a dark place.
【０００３】そこで、この問題の解決策として、図５に
示すような構造が提案されている。図５に、従来の有機
ＥＬ光源を備えた反射型液晶表示装置の一表示画素の断
面図を示す。ガラスなどの絶縁基板１上に、ゲート電極
２を形成し、そのゲート電極２上に設けた絶縁膜３を介
して多結晶シリコンから成る能動層４を形成する。その
能動層４には、チャネル領域７、及びストッパ８でチャ
ネル領域７をマスクして不純物を注入して形成したソー
ス５並びにドレイン６を設ける。その上には層間絶縁膜
９が形成されており、一方のソース５は層間絶縁膜９に
形成されたコンタクトホールを介して、Ａｌ等の反射材
料から成る表示電極（ソース電極）１０と接続されてい
る。他方のドレイン６は層間絶縁膜９に形成されたコン
タクトホールを介してドレイン電極１１に接続されてい
る。こうして薄膜トランジスタ（Thin Film Transisto
r、以下、「ＴＦＴ」と称する。）が形成された絶縁基
板１、即ちＴＦＴ基板１が完成する。Therefore, as a solution to this problem, a structure as shown in FIG. 5 has been proposed. FIG. 5 is a sectional view of one display pixel of a reflection type liquid crystal display device provided with a conventional organic EL light source. A gate electrode 2 is formed on an insulating substrate 1 made of glass or the like, and an active layer 4 made of polycrystalline silicon is formed via an insulating film 3 provided on the gate electrode 2. The active layer 4 is provided with a source 5 and a drain 6 formed by implanting impurities by masking the channel region 7 with the channel region 7 and the stopper 8. An interlayer insulating film 9 is formed thereon, and one source 5 is connected to a display electrode (source electrode) 10 made of a reflective material such as Al via a contact hole formed in the interlayer insulating film 9. ing. The other drain 6 is connected to a drain electrode 11 via a contact hole formed in the interlayer insulating film 9. Thus, a thin film transistor (Thin Film Transisto)
r, hereinafter referred to as “TFT”. Is completed, that is, the TFT substrate 1 is completed.
【０００４】次に、ＴＦＴ基板１に対向した対向電極基
板１２は、その対向面に対向電極１３を備えその上に遮
光部１５を備えたカラーフィルタ１４を設けている。遮
光部１５は、後述の図２の斜線部で示すように、表示電
極１０以外の領域、即ちＴＦＴ、そのＴＦＴに走査信号
を供給する走査信号線Ｇ、及びＴＦＴに映像信号を供給
する映像信号線Ｄに対応した位置に設けられている。Next, a counter electrode substrate 12 facing the TFT substrate 1 is provided with a counter electrode 13 on its facing surface and a color filter 14 having a light shielding portion 15 thereon. As shown by the shaded portion in FIG. 2 described later, the light-shielding portion 15 includes a region other than the display electrode 10, ie, a TFT, a scanning signal line G for supplying a scanning signal to the TFT, and a video signal for supplying a video signal to the TFT. It is provided at a position corresponding to the line D.
【０００５】こうして出来上がった対向電極基板１２と
ＴＦＴ基板１とをそれらの周辺を接着し、これらの基板
１，１２間に液晶１６を充填して反射型液晶表示装置が
完成する。対向電極基板１２の対向電極１３を形成して
いない側にＥＬ素子基板１７を設ける。[0005] The thus-prepared counter electrode substrate 12 and TFT substrate 1 are bonded together at their periphery, and a liquid crystal 16 is filled between these substrates 1 and 12 to complete a reflection type liquid crystal display device. An EL element substrate 17 is provided on the side of the counter electrode substrate 12 where the counter electrode 13 is not formed.
【０００６】このＥＬ素子基板１７は、ガラス基板等の
透明絶縁性基板から成っている。その一方の面１７ａに
は有機ＥＬ素子１８が形成されており他方の面１７ｂが
対向電極基板１２に貼り合わされて密着している。ま
た、有機ＥＬ素子１８は、遮光部１５に対応した位置
に、ＩＴＯ（Indium Thin Oxide）等の透明電極から成
る陽極２０、ＭＴＤＡＴＡ（4,4'-bis(3-methylphenylp
henylamino)biphenyl）から成る第２ホール輸送層、Ｔ
ＰＤ（4,4',4"-tris(3-methylphenylphenylamino)triph
enylanine）からなる第１ホール輸送層、キナクリドン
（Quinacridone）誘導体を含むＢｅｂｑ2（10-ベンゾ
〔ｈ〕キノリノール−ベリリウム錯体）から成る発光
層、及びＢｅｂｑ2から成る電子輸送層の各有機化合物
から成る発光素子層２１、マグネシウム・インジウム合
金（ＭｇＩｎ）から成る陰極２２がこの順番で積層形成
されて成っている。有機ＥＬ素子１８は、このように陽
極２０、陰極２２及び発光素子層２１によって構成され
ている。[0006] The EL element substrate 17 is formed of a transparent insulating substrate such as a glass substrate. The organic EL element 18 is formed on one surface 17a, and the other surface 17b is adhered to and adhered to the counter electrode substrate 12. The organic EL element 18 has an anode 20 formed of a transparent electrode such as ITO (Indium Thin Oxide) and a MTDATA (4,4′-bis (3-methylphenylp
a second hole transport layer composed of henylamino) biphenyl), T
PD (4,4 ', 4 "-tris (3-methylphenylphenylamino) triph
a light-emitting element comprising a first hole-transport layer composed of enylanine, a light-emitting layer composed of Bebq2 (10-benzo [h] quinolinol-beryllium complex) containing a quinacridone derivative, and an electron transport layer composed of Bebq2. A layer 21 and a cathode 22 made of a magnesium-indium alloy (MgIn) are laminated in this order. The organic EL element 18 is thus constituted by the anode 20, the cathode 22, and the light emitting element layer 21.
【０００７】有機ＥＬ素子１８は、陽極から注入された
ホールと、陰極から注入された電子とが発光層の内部で
再結合し、発光層を形成する有機分子を励起して励起子
が生じる。この励起子が放射失活する過程で発光層から
光が放たれ、この光が陽極２０から外部へ放出される
（図中、破線矢印方向）。In the organic EL element 18, the holes injected from the anode and the electrons injected from the cathode are recombined inside the light emitting layer to excite the organic molecules forming the light emitting layer to generate excitons. Light is emitted from the light emitting layer during the process of radiation deactivation of the excitons, and the light is emitted to the outside from the anode 20 (in the direction of the broken arrow in the figure).
【０００８】[0008]
【発明が解決しようとする課題】ところが、そのＥＬ素
子１８は対向電極基板１２の遮光部１５に対応した位置
に配置されているため、図５中の破線矢印に示すよう
に、ＥＬ素子１８からの光３０は、その多くが遮光部１
５に遮られてしまい表示電極１０へ進む光はごく一部し
かなく、表示画素のうち遮光部付近のみしか明るくなら
ないという欠点があった。However, since the EL element 18 is disposed at a position corresponding to the light-shielding portion 15 of the counter electrode substrate 12, the EL element 18 is moved from the EL element 18 as shown by the broken arrow in FIG. Most of the light 30 is
5 has a disadvantage that only a small portion of the light travels to the display electrode 10 and travels only to the vicinity of the light shielding portion of the display pixel.
【０００９】そこで本発明は、上記の従来の欠点に鑑み
て為されたものであり、明るくかつ均一な明るさの表示
が得られる反射型液晶表示装置を提供することを目的と
する。The present invention has been made in view of the above-mentioned conventional disadvantages, and has as its object to provide a reflective liquid crystal display device capable of obtaining a bright and uniform brightness display.
【００１０】[0010]
【課題を解決するための手段】本発明の反射型液晶表示
装置は、反射材料から成る表示電極、該表示電極が接続
され液晶を駆動するＴＦＴを備えた第１の基板と、該第
１の基板に対向し電極を備えた第２の透明基板とを有
し、両基板間に前記液晶を充填して成る反射型液晶表示
装置であって、前記第２の透明基板に対向して設けた第
３の透明基板は、前記表示電極以外の領域にＥＬ素子を
備え、該ＥＬ素子形成位置に対応して前記第２の透明基
板側に光拡散体を備える。According to the present invention, there is provided a reflective liquid crystal display device comprising: a display electrode made of a reflective material; a first substrate having a TFT connected to the display electrode and driving a liquid crystal; A reflective liquid crystal display device having a second transparent substrate provided with electrodes facing the substrate, wherein the liquid crystal is filled between the two substrates, the reflective liquid crystal display device being provided facing the second transparent substrate. The third transparent substrate includes an EL element in a region other than the display electrode, and includes a light diffuser on the side of the second transparent substrate corresponding to the position where the EL element is formed.
【００１１】また、本発明の反射型液晶表示装置は、反
射材料から成る表示電極、該表示電極が接続され液晶を
駆動するＴＦＴを備えた第１の基板と、該第１の基板に
対向し電極を備えた第２の透明基板とを有し、両基板間
に前記液晶を充填して成る反射型液晶表示装置であっ
て、前記第２の透明基板に対向して設けた第３の透明基
板は前記表示電極以外の領域にＥＬ素子を備え、前記第
２の透明基板における前記第３の透明基板側には前記Ｅ
Ｌ素子形成位置に対応して光拡散体を備える。Further, the reflection type liquid crystal display device of the present invention comprises a display electrode made of a reflection material, a first substrate having a TFT connected to the display electrode and driving a liquid crystal, and a first substrate facing the first substrate. A reflection type liquid crystal display device comprising: a second transparent substrate provided with electrodes, wherein the liquid crystal is filled between the two substrates, wherein a third transparent substrate provided opposite to the second transparent substrate. The substrate is provided with an EL element in a region other than the display electrode, and the E is provided on the third transparent substrate side of the second transparent substrate.
A light diffuser is provided corresponding to the L element formation position.
【００１２】また、前記光拡散体は前記第３の透明基板
をエッチングして形成した凸形状レンズである。更に、
前記光拡散体は前記第２の透明基板をエッチングして形
成した凹形状レンズである。Further, the light diffuser is a convex lens formed by etching the third transparent substrate. Furthermore,
The light diffuser is a concave lens formed by etching the second transparent substrate.
【００１３】[0013]
【発明の実施の形態】以下に、本発明の反射型液晶表示
装置について図に従って説明する。図１は、第１の実施
の形態の有機ＥＬ素子を補助光源として備えた液晶表示
装置の１つの表示画素の断面図を示し、図２は、その平
面図を示す。なお、以下の説明において、既に説明した
図面と同一部分には同一符号を付す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A reflection type liquid crystal display device of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of one display pixel of a liquid crystal display device including the organic EL element according to the first embodiment as an auxiliary light source, and FIG. 2 is a plan view thereof. In the following description, the same parts as those in the drawings already described are denoted by the same reference numerals.
【００１４】ガラスなどの透明絶縁性基板１上に、ゲー
ト電極２を形成し、そのゲート電極２上に設けたゲート
絶縁膜３を介して例えば多結晶シリコンから成る能動層
４を形成する。その能動層４には、チャネル領域７、及
びストッパ８でチャネル７をマスクして不純物を注入し
て形成したソース５並びにドレイン６を設ける。その上
には層間絶縁膜９が形成されており、一方のソース５は
層間絶縁膜９に形成されたコンタクトホールを介して、
反射材料から成る表示電極（ソース電極）１０と接続さ
れている。他方のドレイン６は層間絶縁膜９に形成され
たコンタクトホールを介してドレイン電極１１に接続さ
れている。こうしてＴＦＴが形成された絶縁基板１、即
ちＴＦＴ基板１が完成する。A gate electrode 2 is formed on a transparent insulating substrate 1 such as glass, and an active layer 4 made of, for example, polycrystalline silicon is formed via a gate insulating film 3 provided on the gate electrode 2. The active layer 4 is provided with a source 5 and a drain 6 formed by implanting impurities while masking the channel 7 with the channel region 7 and the stopper 8. An interlayer insulating film 9 is formed thereon, and one source 5 is connected via a contact hole formed in the interlayer insulating film 9.
It is connected to a display electrode (source electrode) 10 made of a reflective material. The other drain 6 is connected to a drain electrode 11 via a contact hole formed in the interlayer insulating film 9. Thus, the insulating substrate 1 on which the TFT is formed, that is, the TFT substrate 1 is completed.
【００１５】次に、ＴＦＴ基板１に対向した対向電極基
板１２は、対向電極１３を備えその上に遮光部１５を備
えたカラーフィルタ１４を設けている。遮光部１５は図
２に斜線で示すように、ＴＦＴ、走査信号線Ｇ及び映像
信号線Ｄに対応した領域、即ち表示電極以外の領域に設
けられている。こうして出来上がった対向電極基板１２
とＴＦＴ基板１とをそれらの周辺を接着し、これらの基
板１，１２間に液晶１３を充填して反射型液晶表示装置
が完成する。Next, a counter electrode substrate 12 facing the TFT substrate 1 is provided with a counter electrode 13 and a color filter 14 provided with a light shielding portion 15 thereon. The light-shielding portion 15 is provided in a region corresponding to the TFT, the scanning signal line G, and the video signal line D, that is, a region other than the display electrode, as indicated by oblique lines in FIG. The counter electrode substrate 12 thus completed
The TFT substrate 1 and the periphery thereof are bonded together, and a liquid crystal 13 is filled between the substrates 1 and 12 to complete a reflection type liquid crystal display device.
【００１６】対向電極基板１２の液晶１６を備えていな
い側（図１中、対向電極基板１２の上側）にＥＬ素子基
板１７を設ける。以下に、ＥＬ素子基板１７について説
明する。ＥＬ素子基板１７には、その一方の面１７ａに
は有機ＥＬ素子１８が形成され、他方の面１７ｂには有
機ＥＬ素子１８に対応した位置に光拡散体である凸形状
レンズ１９が形成されている。An EL element substrate 17 is provided on the side of the counter electrode substrate 12 where the liquid crystal 16 is not provided (the upper side of the counter electrode substrate 12 in FIG. 1). Hereinafter, the EL element substrate 17 will be described. An organic EL element 18 is formed on one surface 17a of the EL element substrate 17, and a convex lens 19 as a light diffuser is formed on a position corresponding to the organic EL element 18 on the other surface 17b. I have.
【００１７】図３に従ってＥＬ素子基板の一方の面１７
ｂに形成する凸形状レンズの形成方法について説明す
る。ＥＬ素子基板１７はガラス基板等の透明絶縁性基板
から成っている。ここでは、ＥＬ素子基板としてガラス
基板を用いた場合について説明する。図３（ａ）に示す
ように、ガラス基板１７ｂ上に凸形状レンズを形成する
表示電極以外の領域（同図の場合は、走査信号線Ｇ及び
映像信号線Ｄに対応した領域）にレジストパターンＰ
（斜線部）を形成する。次に弗酸系のエッチング液、例
えば希弗酸でガラス基板をエッチングして図３（ｂ）に
示すような凸形状レンズ、例えばかまぼこ型レンズ１９
を形成する。According to FIG. 3, one surface 17 of the EL element substrate
The method for forming the convex lens formed in b will be described. The EL element substrate 17 is made of a transparent insulating substrate such as a glass substrate. Here, a case where a glass substrate is used as an EL element substrate will be described. As shown in FIG. 3A, a resist pattern is formed on a region other than the display electrode forming the convex lens on the glass substrate 17b (in the case of FIG. 3A, a region corresponding to the scanning signal line G and the video signal line D). P
(Shaded area). Next, the glass substrate is etched with a hydrofluoric acid-based etchant, for example, dilute hydrofluoric acid, to form a convex lens such as the one shown in FIG.
To form
【００１８】こうして、凸状レンズ１９は、反射型液晶
表示パネルの全面に配置された表示電極以外の領域に設
けられる。その領域のガラス基板１７ａ上には有機ＥＬ
素子１８が形成される。有機ＥＬ素子は、一般的な構造
の有機ＥＬ素子である。図１に示す有機ＥＬ素子１８の
上には外部からの力による損傷を避けるために、絶縁膜
等によってカバーされていることが好ましい。Thus, the convex lens 19 is provided in a region other than the display electrodes arranged on the entire surface of the reflection type liquid crystal display panel. An organic EL is provided on the glass substrate 17a in that region.
An element 18 is formed. The organic EL element is an organic EL element having a general structure. The organic EL element 18 shown in FIG. 1 is preferably covered with an insulating film or the like in order to avoid damage due to external force.
【００１９】図１に示すように、有機ＥＬ素子から放た
れた光３０は、破線矢印のように陽極２０から凸形状レ
ンズ１９へ放出される。その放出された光は従来のよう
に遮光膜１５に遮られることなく表示電極１０に対応し
た位置のカラーフィルタ（この場合「Ｒ」）及び反射材
料から成る表示電極１０に供給され、そこで反射され
て、カラーフィルタ１４，対向電極１３、対向電極基板
１２及びＥＬ素子基板１７を通って外部に出る。それに
よって表示が得られる。As shown in FIG. 1, the light 30 emitted from the organic EL element is emitted from the anode 20 to the convex lens 19 as shown by the dashed arrow. The emitted light is supplied to the color filter (in this case, “R”) and the display electrode 10 made of a reflective material at a position corresponding to the display electrode 10 without being blocked by the light shielding film 15 as in the related art, and is reflected there. Then, the light exits through the color filter 14, the counter electrode 13, the counter electrode substrate 12, and the EL element substrate 17 to the outside. Thereby, a display is obtained.
【００２０】このように、反射型液晶表示装置の各表示
画素付近の遮光部に対応した位置に設けた凸形状レンズ
により有機ＥＬ素子から発光される光が拡散されるた
め、表示電極に多くの光量が供給されることになり、有
機ＥＬ素子の発光光の利用効率を向上することができる
とともに、明るくかつ表示装置全面において均一な明る
さの表示が得られることになる。As described above, since the light emitted from the organic EL element is diffused by the convex lens provided at the position corresponding to the light shielding portion near each display pixel of the reflection type liquid crystal display device, a large amount of light is emitted to the display electrode. Since the light amount is supplied, the use efficiency of the emitted light of the organic EL element can be improved, and a bright and uniform display can be obtained on the entire display device.
【００２１】なお、上述の如く表示画素に十分に光が供
給されるため、本実施の形態のようにカラーフィルタを
備えた場合には色合いの良い表示が得られることにな
る。また、本実施の形態においては、凸形状レンズを図
２の斜線部で示す遮光部に全体に設けた場合を説明した
が、それに限定するものではなく、図２の円で示すよう
に、走査信号線と映像信号線との交点付近のＴＦＴも覆
った遮光部に概ね半球状の凸レンズを設けても良い。比
較的広い領域が確保できるので大きな凸形状レンズを形
成することができる。従って、この交点付近の領域にの
み凸形状レンズ及び有機ＥＬ素子を形成しても明るく且
つ均一な明るさの表示を得ることができる。 ＜第２の実施の形態＞図４は、第２の実施の形態の有機
ＥＬ素子を補助光源として備えた液晶表示装置の１つの
画素の断面図である。Since sufficient light is supplied to the display pixels as described above, when a color filter is provided as in the present embodiment, a display with good tint can be obtained. Further, in the present embodiment, a case has been described in which the convex lens is entirely provided in the light-shielding portion indicated by the hatched portion in FIG. 2. However, the present invention is not limited to this. A substantially hemispherical convex lens may be provided in the light-shielding portion that also covers the TFT near the intersection of the signal line and the video signal line. Since a relatively large area can be secured, a large convex lens can be formed. Therefore, even if the convex lens and the organic EL element are formed only in the region near the intersection, a bright and uniform brightness display can be obtained. <Second Embodiment> FIG. 4 is a cross-sectional view of one pixel of a liquid crystal display device provided with the organic EL element of the second embodiment as an auxiliary light source.
【００２２】同図に示す如く、前述の図１の液晶表示装
置と異なる点は、凹形状レンズ２３を第２の透明基板で
ある対向電極基板１２のＥＬ素子基板１７に対向した面
１２ａに設けた点である。第１の基板であるＴＦＴ基板
１は第１の実施の形態と同じ構造であるので説明は省略
する。As shown in the figure, the difference from the liquid crystal display device of FIG. 1 is that a concave lens 23 is provided on the surface 12a of the counter electrode substrate 12, which is the second transparent substrate, facing the EL element substrate 17. It is a point. The TFT substrate 1, which is the first substrate, has the same structure as in the first embodiment, and a description thereof will be omitted.
【００２３】第２の透明基板である対向電極基板１２は
例えばガラス基板から成っており、カラーフィルタ１４
の遮光部１５に応じた位置に、光拡散体である凹形状の
レンズ２３を備えている。この凹形状レンズ２３は、図
３（ａ）に示したレジスト形成パターンを反転させたパ
ターン、即ちレンズを形成する位置に窓を有するレジス
トパターン（表示電極領域にレジストが残存するパター
ン）を対向電極基板１２の一方の面１２ａに設けて、弗
酸系のエッチング液によってエッチングしてガラス基板
の一方の面１２ａに凹状の溝を形成する。The counter electrode substrate 12, which is a second transparent substrate, is made of, for example, a glass substrate,
A concave lens 23, which is a light diffuser, is provided at a position corresponding to the light shielding portion 15. This concave lens 23 is formed by inverting a resist forming pattern shown in FIG. 3A, that is, a resist pattern having a window at a position where a lens is formed (a pattern in which a resist remains in a display electrode region) as a counter electrode. It is provided on one surface 12a of the substrate 12, and is etched with a hydrofluoric acid-based etchant to form a concave groove on the one surface 12a of the glass substrate.
【００２４】その後、他方の面１２ｂに、対向電極１３
及びカラーフィルタ１４を順に積層する。第３の透明基
板であるＥＬ素子基板１７は平坦なガラス基板から成っ
ており遮光部１５の位置に対応して有機ＥＬ素子１８が
形成されている。即ち、有機ＥＬ素子１８と凹形状レン
ズ２３とは互いに対応した位置に形成されている。Thereafter, the counter electrode 13 is provided on the other surface 12b.
And the color filters 14 are sequentially laminated. The EL element substrate 17 serving as the third transparent substrate is formed of a flat glass substrate, and the organic EL element 18 is formed corresponding to the position of the light shielding portion 15. That is, the organic EL element 18 and the concave lens 23 are formed at positions corresponding to each other.
【００２５】有機ＥＬ素子１８から発光した光３０は、
ＴＦＴ基板１側に向かって発光され表示電極１０にて反
射されて、その後液晶層１６、カラーフィルタ１４及び
対向電極基板１２を通って出射する。このとき有機ＥＬ
素子１８は遮光部１５に対応した位置に形成してある
が、光は遮光部に遮られることなく凹形状レンズによっ
て拡散されるため、表示画素に多くの光量を供給するこ
とができるようになり明るい液晶表示装置の表示を得る
ことができる。また、表示装置の各表示電極周辺の遮光
部に有機ＥＬ素子及び凹形状レンズを形成しているので
表示装置全面で均一な明るさの液晶表示装置を得ること
ができる。The light 30 emitted from the organic EL element 18 is
Light is emitted toward the TFT substrate 1 side, is reflected by the display electrode 10, and then exits through the liquid crystal layer 16, the color filter 14, and the counter electrode substrate 12. At this time, the organic EL
Although the element 18 is formed at a position corresponding to the light shielding portion 15, light is diffused by the concave lens without being blocked by the light shielding portion, so that a large amount of light can be supplied to the display pixels. A bright liquid crystal display can be obtained. Further, since the organic EL element and the concave lens are formed in the light-shielding portion around each display electrode of the display device, a liquid crystal display device having uniform brightness over the entire display device can be obtained.
【００２６】なお、上述の各実施の形態においては、遮
光部１５はカラーフィルタ１４に設けられている場合に
ついて説明したが、対向電極基板１２の液晶１６を配置
した側に黒色の樹脂等にて設けられている場合でも適用
は可能である。また、各実施の形態のＥＬ素子基板は反
射型液晶表示パネルの対向電極基板に接着剤等にて接着
して反射型液晶表示パネルと一体の構造でも、取り外し
可能な別体の構造でも良い。In each of the above embodiments, the case where the light-shielding portion 15 is provided on the color filter 14 has been described. However, a black resin or the like is provided on the side of the counter electrode substrate 12 where the liquid crystal 16 is arranged. Application is possible even if provided. Further, the EL element substrate of each embodiment may be bonded to an opposing electrode substrate of the reflective liquid crystal display panel with an adhesive or the like to be integrated with the reflective liquid crystal display panel, or may be a detachable separate structure.
【００２７】また、本発明の光拡散体である凸形状レン
ズ及び凹形状レンズは、それらを設ける基板をエッチン
グして形成するので、別体のレンズを基板に貼り付ける
場合に比べ所望の位置に正確に形成することができる。Further, the convex lens and the concave lens, which are the light diffusers of the present invention, are formed by etching the substrate on which they are provided, so that they are located at desired positions as compared with a case where a separate lens is attached to the substrate. It can be formed accurately.
【００２８】[0028]
【発明の効果】本発明の反射型液晶表示装置によれば、
表示装置全面で明るくかつ均一な明るさの表示を得るこ
とができる。According to the reflection type liquid crystal display device of the present invention,
Bright and uniform brightness display can be obtained over the entire display device.
【図１】本発明の第１の実施の形態を示す反射型液晶表
示装置の断面図である。FIG. 1 is a cross-sectional view of a reflective liquid crystal display device according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態を示す反射型液晶表
示装置の平面図である。FIG. 2 is a plan view of the reflective liquid crystal display device showing the first embodiment of the present invention.
【図３】本発明の凸形状レンズの形成パターンを示す斜
視図である。FIG. 3 is a perspective view showing a formation pattern of a convex lens of the present invention.
【図４】本発明の第２の実施の形態を示す反射型液晶表
示装置の断面図である。FIG. 4 is a sectional view of a reflective liquid crystal display device according to a second embodiment of the present invention.
【図５】従来の反射型液晶表示装置の断面図である。FIG. 5 is a sectional view of a conventional reflective liquid crystal display device.
１ ＴＦＴ基板 １０ 表示電極 １２ 対向電極基板 １５ 遮光部 １７ ＥＬ素子基板 １９ 凸形状レンズ ２０ 陽極 ２１ 発光素子層 ２２ 陰極 ２３ 凹形状レンズ DESCRIPTION OF SYMBOLS 1 TFT substrate 10 Display electrode 12 Counter electrode substrate 15 Light shielding part 17 EL element substrate 19 Convex lens 20 Anode 21 Light emitting element layer 22 Cathode 23 Concave lens
Claims (4)
が接続され液晶を駆動する薄膜トランジスタを備えた第
１の基板と、該第１の基板に対向し電極を備えた第２の
透明基板とを有し、両基板間に前記液晶を充填して成る
反射型液晶表示装置であって、前記第２の透明基板に対
向して設けた第３の透明基板は、前記表示電極以外の領
域にエレクトロルミネッセンス素子を備え、該エレクト
ロルミネッセンス素子形成位置に対応して前記第２の透
明基板側に光拡散体を備えることを特徴とする反射型液
晶表示装置。1. A display substrate comprising a reflective material, a first substrate provided with a thin film transistor connected to the display electrode and driving a liquid crystal, and a second transparent substrate provided with an electrode opposed to the first substrate. A reflective liquid crystal display device having the liquid crystal filled between the two substrates, wherein a third transparent substrate provided opposite to the second transparent substrate is provided in a region other than the display electrodes. A reflection type liquid crystal display device comprising: an electroluminescent element; and a light diffuser on the second transparent substrate side corresponding to a position where the electroluminescent element is formed.
極が接続され液晶を駆動する薄膜トランジスタを備えた
第１の基板と、該第１の基板と対向し電極を備えた第２
の透明基板とを有し、両基板間に前記液晶を充填して成
る反射型液晶表示装置であって、前記第２の透明基板に
対向して設けた第３の透明基板は前記表示電極以外の領
域にエレクトロルミネッセンス素子を備え、前記第２の
透明基板における前記第３の透明基板側には前記エレク
トロルミネッセンス素子形成位置に対応して光拡散体を
備えることを特徴とする反射型液晶表示装置。2. A display device comprising: a display electrode made of a reflective material; a first substrate provided with a thin film transistor connected to the display electrode for driving a liquid crystal; and a second substrate provided with an electrode facing the first substrate.
A liquid crystal display device having the transparent substrate and the liquid crystal filled between the two substrates, wherein a third transparent substrate provided opposite to the second transparent substrate is other than the display electrode. A reflective liquid crystal display device comprising: an electroluminescent element in a region of the second transparent substrate; and a light diffuser corresponding to the electroluminescent element forming position on the third transparent substrate side of the second transparent substrate. .
ッチングして形成した凸形状レンズであることを特徴と
する請求項１記載の反射型液晶表示装置。3. The reflection type liquid crystal display device according to claim 1, wherein the light diffuser is a convex lens formed by etching the third transparent substrate.
ッチングして形成した凹形状レンズであることを特徴と
する請求項２記載の反射型液晶表示装置。4. The reflective liquid crystal display device according to claim 2, wherein the light diffuser is a concave lens formed by etching the second transparent substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04756898A JP3831510B2 (en) | 1998-02-27 | 1998-02-27 | Reflective liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04756898A JP3831510B2 (en) | 1998-02-27 | 1998-02-27 | Reflective liquid crystal display |
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| Publication Number | Publication Date |
|---|---|
| JPH11249132A true JPH11249132A (en) | 1999-09-17 |
| JP3831510B2 JP3831510B2 (en) | 2006-10-11 |
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ID=12778845
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04756898A Expired - Fee Related JP3831510B2 (en) | 1998-02-27 | 1998-02-27 | Reflective liquid crystal display |
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