CN101257035B

Movatterモバイル変換

Info

Publication number: CN101257035B
Application number: CN2007100796035A
Authority: CN
Inventors: 张世昌; 曾章和; 王士宾
Original assignee: Chi Mei Optoelectronics Corp
Current assignee: Innolux Corp
Priority date: 2007-02-26
Filing date: 2007-02-26
Publication date: 2012-07-18
Anticipated expiration: 2027-02-26
Also published as: CN101257035A

Abstract

A top emission organic electroluminescent display comprising: a substrate including a display region; the conducting layer is positioned on the substrate and is electrically connected with the substrate; a reflective layer on the display region of the substrate; a dielectric layer on the conductive layer, the reflective layer and the substrate, wherein the dielectric layer has a contact window exposing the conductive layer; a transparent electrode layer located on the dielectric layer and electrically connected to the conductive layer along the contact window; and an organic electroluminescent layer disposed on the transparent electrode layer and corresponding to the display region.

Description

Translated fromChinese

顶部发光有机电致发光显示器top-emitting organic electroluminescent display

技术领域technical field

本发明有关于一种顶部发光有机电致发光显示器，而特别有关于一种可提升发光效率及光色度的顶部发光有机电致发光显示器。The present invention relates to a top-emitting organic electroluminescent display, and in particular to a top-emitting organic electroluminescent display capable of improving luminous efficiency and chromaticity.

背景技术Background technique

有机电致发光显示器(organic electroluminescent devices)(又称为有机电致发光二极管(organic light emitting diode，OLED)显示器)其发光原理是在有机分子材料施加一外加电场使其产生发光现象。有机电致发光显示器因为其自发光性(selfemission)，可阵列式显示(dot matrix type display)，具有轻薄、高对比、低消耗功率、高解析度、反应时间短(fast response time)、不需背光源及广视角等特性，且其面板尺寸可由4mm微型显示器至100寸的大型户外看板，被视为下一代平面显示器之主流，除了显示器的应用之外，有机电的发光元件更可在轻薄可挠曲的材质上形成阵列式结构。Organic electroluminescent devices (also known as organic light emitting diode (OLED) displays) emit light by applying an external electric field to organic molecular materials to generate light. Due to its self-luminescence (selfemission), organic electroluminescent display can be displayed in array (dot matrix type display), which has light and thin, high contrast, low power consumption, high resolution, short response time (fast response time), no Features such as backlight and wide viewing angle, and its panel size can range from a 4mm microdisplay to a 100-inch large outdoor billboard. It is regarded as the mainstream of the next-generation flat-panel display. An array structure is formed on a flexible material.

在显示器的应用上，全彩是市场成功的必要条件，若依彩色化方式区分，有机电致发光显示器结构主要可分为三色发光层结构、色转换层(colorchange media，CCM)以及彩色滤光膜结构(color filter，CF)等三种方式，其中三色发光层结构为目前有机电致发光显示器全彩化最常使用的方式，是将红、蓝、绿三色的发光材料分别涂布于像素中，加入不同偏压以产生全彩效果，且具有发光效率最佳化的优点。In the application of displays, full color is a necessary condition for market success. According to the colorization method, the structure of organic electroluminescent display can be divided into three-color light-emitting layer structure, color change media (color change media, CCM) and color filter. Light film structure (color filter, CF) and other three methods, among which the three-color light-emitting layer structure is currently the most commonly used method for full-color organic electroluminescent displays, which is to coat red, blue and green light-emitting materials separately. Distributed in pixels, adding different bias voltages to produce full-color effects, and has the advantage of optimizing luminous efficiency.

发明内容Contents of the invention

本发明的目的在于提供一种顶部发光有机电致发光显示器，用以改善传统顶部发光有机电致发光显示器中反射层氧化造成阻抗的问题，并藉由调整介电层的厚度来提高发光效率及光色度。The object of the present invention is to provide a top-emitting organic electroluminescent display, which is used to improve the problem of impedance caused by the oxidation of the reflective layer in the traditional top-emitting organic electroluminescent display, and by adjusting the thickness of the dielectric layer to improve the luminous efficiency and light chroma.

为达上述目的，本发明提供一种顶部发光有机电致发光显示器，包括：基板，包含显示区；导电层，位于该基板之上，且与该基板电连接；反射层，位于该基板的该显示区上；介电层，位于该导电层、该反射层与该基板之上，其中该介电层具有接触窗露出该导电层；透明电极层，位于该介电层之上，且沿该接触窗与该导电层电连接；以及有机电致发光层，位于该透明电极层之上，并对应至该显示区。To achieve the above object, the present invention provides a top emission organic electroluminescent display, comprising: a substrate, including a display area; a conductive layer, located on the substrate, and electrically connected to the substrate; a reflective layer, located on the substrate of the substrate. on the display area; a dielectric layer located on the conductive layer, the reflective layer and the substrate, wherein the dielectric layer has a contact window exposing the conductive layer; a transparent electrode layer located on the dielectric layer and along the The contact window is electrically connected with the conductive layer; and the organic electroluminescent layer is located on the transparent electrode layer and corresponds to the display area.

为达上述目的，本发明还提供一种顶部发光有机电致发光显示器，包括：基板，包括多个不同颜色的次像素区；导电层，位于该基板之上的该些次像素区内，且与该基板电连接；反射层，位于该基板上的该些次像素区内；介电层，位于该导电层、该反射层与该基板之上，其中该介电层具有一接触窗露出该导电层，且该介电层在该些不同颜色的次像素区具有不同的厚度；透明电极层，位于该介电层之上且沿该接触窗与该导电层电连接；以及多个不同颜色的有机电致发光层，位于该透明电极层之上，并对应至该些次像素区。To achieve the above object, the present invention also provides a top emission organic electroluminescent display, comprising: a substrate including a plurality of sub-pixel regions of different colors; a conductive layer located in the sub-pixel regions on the substrate, and It is electrically connected with the substrate; the reflective layer is located in the sub-pixel regions on the substrate; the dielectric layer is located on the conductive layer, the reflective layer and the substrate, wherein the dielectric layer has a contact window exposing the a conductive layer, and the dielectric layer has different thicknesses in the sub-pixel regions of different colors; a transparent electrode layer, located on the dielectric layer and electrically connected to the conductive layer along the contact window; and a plurality of different colors The organic electroluminescent layer is located on the transparent electrode layer and corresponds to the sub-pixel regions.

附图说明Description of drawings

图1显示发明人所知的一种顶部发光有机电致发光显示器的剖面图；Fig. 1 shows the sectional view of a kind of top emission organic electroluminescent display known to the inventor;

图2显示本发明一实施例的顶部发光有机电致发光显示器的剖面图；2 shows a cross-sectional view of a top-emission organic electroluminescent display according to an embodiment of the present invention;

图3显示本发明另一实施例的顶部发光有机电致发光显示器的剖面图；3 shows a cross-sectional view of a top-emitting organic electroluminescent display according to another embodiment of the present invention;

图4显示本发明又一实施例的顶部发光有机电致发光显示器的剖面图。FIG. 4 shows a cross-sectional view of a top emission organic electroluminescent display according to another embodiment of the present invention.

主要元件符号说明Description of main component symbols

有机电致发光显示器～100、200、300、400；有源元件基板～101、201、301；导电层～103、203、303；保护层～401；反射层～109、205、305、405；介电层～105、207、307；接触窗～107、209、309、409；透明电极层～111、211、311；有机电致发光层～113、213；有机电致红光发光层～313R；有机电致绿光发光层～313G；有机电致蓝光发光层～313B；显示区～112、212；红色次像素区～300R；绿色次像素区～300G；蓝色次像素区～300B；像素定义层～115、215、315Organic electroluminescent display ~ 100, 200, 300, 400; active element substrate ~ 101, 201, 301; conductive layer ~ 103, 203, 303; protective layer ~ 401; reflective layer ~ 109, 205, 305, 405; Dielectric layer ~ 105, 207, 307; contact window ~ 107, 209, 309, 409; transparent electrode layer ~ 111, 211, 311; organic electroluminescent layer ~ 113, 213; organic electroluminescent red light emitting layer ~ 313R ; organic electro-green light-emitting layer ~ 313G; organic electro-blue light-emitting layer ~ 313B; display area ~ 112, 212; red sub-pixel area ~ 300R; green sub-pixel area ~ 300G; blue sub-pixel area ~ 300B; pixel Define Layer ~ 115, 215, 315

具体实施方式Detailed ways

图1显示发明人所知的一种顶部发光有机电致发光显示器，值得注意的是，图1的结构并非公知技术，而只是用来说明发明人在工艺上所发现的问题。FIG. 1 shows a top emission organic electroluminescent display known to the inventors. It should be noted that the structure in FIG. 1 is not a known technology, but is only used to illustrate the problems discovered by the inventors in the process.

如图1所示的顶部发光有机电致发光显示器100，包括一有源元件基板101，其中具有多个驱动元件(未显示)。在有源元件基板上具有导电层103，用来作为有机发光显示器像素电极与有源元件基板101中源极/漏极的接点，其材质例如是铜或铝。在有源元件基板101以及导电层103上形成有一介电层105，其具有一接触窗107并露出部分导电层103的顶部表面。在介电层105、露出的导电层103以及接触窗107中形成有一反射层109，一般为金属材料，用来反射激发光以增加顶部发光有机电致发光显示器100的发光效率。在反射层109上形成有一透明电极层111，一般为氧化铟锡，作为有机电致发光显示器100的像素电极，并透过导电层103与有源元件基板101电连接。在透明电极层111上中形成有有机电致发光层113，且在有机电致发光层113的周围还包括像素定义层(pixel definition layer)115，用以定义出显示区112。The top emission organicelectroluminescent display 100 shown in FIG. 1 includes anactive element substrate 101 with a plurality of driving elements (not shown). There is aconductive layer 103 on the active element substrate, which is used as a contact between the pixel electrode of the organic light emitting display and the source/drain of theactive element substrate 101 , and its material is copper or aluminum, for example. Adielectric layer 105 is formed on theactive device substrate 101 and theconductive layer 103 , which has a contact window 107 and exposes part of the top surface of theconductive layer 103 . Formed in thedielectric layer 105 , the exposedconductive layer 103 and the contact window 107 is a reflective layer 109 , which is usually a metal material, for reflecting the excitation light to increase the luminous efficiency of the top emitting organicelectroluminescent display 100 . Atransparent electrode layer 111 is formed on the reflective layer 109 , generally indium tin oxide, as a pixel electrode of theorganic electroluminescence display 100 , and is electrically connected to theactive element substrate 101 through theconductive layer 103 . An organicelectroluminescent layer 113 is formed on thetransparent electrode layer 111 , and apixel definition layer 115 is included around the organicelectroluminescent layer 113 to define adisplay area 112 .

如图1所示的顶部发光有机电致发光显示器100，其中以反射性高的金属层(反射层109)做为显示器底部反射式结构来增益发光效率，但是在金属层与透明电极层111间的介面上，会因为些许金属氧化物的生成而使其电阻上升，而降低有机电致发光显示器100的发光效率。此外，由于反射层109紧邻透明电极层111，因此，无法有效调变有机电致发光层113所激发的光线的光路径以提高显示器的发光效率及色度。In the top-emitting organicelectroluminescent display 100 shown in Figure 1, a highly reflective metal layer (reflective layer 109) is used as the bottom reflective structure of the display to increase luminous efficiency, but between the metal layer and thetransparent electrode layer 111 On the interface of theorganic electroluminescence display 100, the resistance of the organicelectroluminescent display 100 will be reduced due to the generation of some metal oxides, which will increase its resistance. In addition, since the reflective layer 109 is adjacent to thetransparent electrode layer 111 , the optical path of the light excited by the organicelectroluminescent layer 113 cannot be effectively adjusted to improve the luminous efficiency and chromaticity of the display.

为了解决上述电阻及发光效率的问题，本发明提出一种顶部发光有机电致发光显示器，藉由调整反射层的形成位置以及介电层的厚度，以降低电阻并有效高发光效率及色度。In order to solve the above-mentioned problems of resistance and luminous efficiency, the present invention proposes a top-emission organic electroluminescent display. By adjusting the formation position of the reflective layer and the thickness of the dielectric layer, the resistance can be reduced and the luminous efficiency and chromaticity can be effectively increased.

图2显示本发明一实施例的顶部发光有机电致发光显示器200，包括一基板(例如有源元件基板)201，其中具有多个驱动元件(未显示)。在有源元件基板201上具有导电层203以及反射层205，其中导电层203可为铜或铝，用来作为有机发光显示器像素电极与有源元件基板201中源极/漏极的的接点。而反射层205一般优选为铝或银，其位于显示区212中用来反射有机电致发光层所激发的光线，以增加显示器的发光效率。导电层203与反射层205可为同层结构，可在形成导电层203时同时制作反射层205，且两者可为相同材料或不同材料。虽然图示中导电层203以及反射层205并未相连，但在另一实施例中，导电层203以及反射层205可为同层且连续的结构。FIG. 2 shows a top emission organicelectroluminescent display 200 according to an embodiment of the present invention, which includes a substrate (such as an active device substrate) 201 with a plurality of driving elements (not shown). Theactive element substrate 201 has aconductive layer 203 and areflective layer 205 , wherein theconductive layer 203 can be copper or aluminum, and is used as a contact between the OLED pixel electrode and the source/drain of theactive element substrate 201 . Thereflective layer 205 is generally preferably made of aluminum or silver, which is located in thedisplay area 212 to reflect the light excited by the organic electroluminescent layer, so as to increase the luminous efficiency of the display. Theconductive layer 203 and thereflective layer 205 can be of the same layer structure, and thereflective layer 205 can be formed at the same time when theconductive layer 203 is formed, and the two can be made of the same material or different materials. Although theconductive layer 203 and thereflective layer 205 are not connected in the figure, in another embodiment, theconductive layer 203 and thereflective layer 205 may be the same layer and a continuous structure.

在有源元件基板201、导电层203以及反射层205上形成有一介电层207，其材质例如是氧化硅、氮化硅或上述材料的组合。介电层207具有一接触窗209露出部分导电层203的顶部表面。在介电层207、露出的导电层203以及接触窗209中形成有一透明电极层211，例如是铟锡氧化物(indium tin oxide，ITO)、铟锌氧化物(indium zinc oxide，IZO)、镉锡氧化物(cadmium tin oxide，CTO)、金属偶氮(metallized AZO)、氧化锌(zinc oxide，ZnO)、氮化铟(indiumnitride，InN)或氧化锡(stannum dioxide，SnO₂)，作为有机电致发光显示器200的像素电极，并透过导电层203与有源元件基板201中的源极/漏极电连接。在透明电极层211上显示区212中形成有有机电致发光层213并对应至介电层207下方的反射层205，其中有机电致发光层213的材料可为小分子或高分子的荧光或磷光材料，虽然图示中只显示一层，但熟悉此技术者应可了解除了发光层外还包括空穴注入层、空穴传输层、电子注入层以及电子传输层，为了简化图示在此不予绘示。在有机电致发光层213的周围还包括像素定义层(pixel definition layer)215，用以定义出显示区212。除了上述结构外，在有机电致发光层上依次形成有上电极、保护层及透明上基板(未显示)。Adielectric layer 207 is formed on theactive element substrate 201 , theconductive layer 203 and thereflective layer 205 , and its material is, for example, silicon oxide, silicon nitride or a combination of the above materials. Thedielectric layer 207 has acontact window 209 exposing part of the top surface of theconductive layer 203 . Atransparent electrode layer 211 is formed in thedielectric layer 207, the exposedconductive layer 203 and thecontact window 209, such as indium tin oxide (ITO), indium zinc oxide (IZO), cadmium Tin oxide (cadmium tin oxide, CTO), metallized AZO (metallized AZO), zinc oxide (zinc oxide, ZnO), indium nitride (indium nitride, InN) or tin oxide (stannum dioxide, SnO₂ ), as organic electrical The pixel electrode of theluminescence display 200 is electrically connected to the source/drain of theactive element substrate 201 through theconductive layer 203 . An organicelectroluminescent layer 213 is formed in thedisplay area 212 on thetransparent electrode layer 211 and corresponds to thereflective layer 205 below thedielectric layer 207, wherein the material of the organicelectroluminescent layer 213 can be small molecule or polymer fluorescent or Phosphorescent material, although only one layer is shown in the diagram, those skilled in the art should understand that in addition to the light-emitting layer, it also includes a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer. To simplify the illustration, here Not shown. Apixel definition layer 215 is also included around the organicelectroluminescent layer 213 to define adisplay area 212 . In addition to the above structure, an upper electrode, a protective layer and a transparent upper substrate (not shown) are sequentially formed on the organic electroluminescent layer.

由图2可得知，在介电层207中形成接触窗209后，紧接着在接触窗209中、导电层203上以及介电层207上形成透明电极层211，而非如图1所示，在接触窗107中、导电层103上以及介电层105上先形成反射层109后再形成透明电极层111。因此，在本发明实施例中，在接触窗209中可避免因金属反射层与透明电极层介面上所生成的金属氧化物而造成电阻上升的问题。此外，相较于图1所示的顶部发光有机电致发光显示器，本发明实施例的反射层205形成在显示区212中以及介电层207之下，介电层207可作为微腔层，使光线在介电层207中产生微腔效应。由于显示区212中透明电极层211与反射层205间隔有一介电层207，因此，有机电致发光层213向下激发的光线的光路经可藉由沉积不同厚度的介电层207进行调变，以透过微腔效应提高显示器200的发光效率及光色度。It can be seen from FIG. 2 that after thecontact window 209 is formed in thedielectric layer 207, atransparent electrode layer 211 is formed in thecontact window 209, on theconductive layer 203 and on thedielectric layer 207, instead of as shown in FIG. 1 In the contact window 107 , on theconductive layer 103 and on thedielectric layer 105 , the reflective layer 109 is first formed and then thetransparent electrode layer 111 is formed. Therefore, in the embodiment of the present invention, the problem of resistance increase caused by the metal oxide formed on the interface between the metal reflective layer and the transparent electrode layer can be avoided in thecontact window 209 . In addition, compared with the top emission organic electroluminescent display shown in FIG. 1, thereflective layer 205 of the embodiment of the present invention is formed in thedisplay area 212 and under thedielectric layer 207, and thedielectric layer 207 can be used as a microcavity layer. The light generates a microcavity effect in thedielectric layer 207 . Since there is adielectric layer 207 between thetransparent electrode layer 211 and thereflective layer 205 in thedisplay area 212, the optical path of the light excited downward by the organicelectroluminescent layer 213 can be modulated by depositing adielectric layer 207 with different thicknesses. , to improve the luminous efficiency and light chromaticity of thedisplay 200 through the microcavity effect.

图3显示本发明另一实施例的顶部发光有机电致发光显示器400，其中与图2标号相同者代表相同的元件，在此不再赘述。图3实施例与图2实施例不同之处在于导电层203和介电层207之间有一保护层(passiviationlayer)401。亦即，在导电层203形成之后，先形成一保护层401，保护层401可为氧化硅、氮化硅、或上述材料的组合。接着，在显示区212的相对位置上，在保护层401上形成一反射层405。接着，在导电层203、保护层401、和反射层405上，形成一介电层207。接着，在介电层207和保护层401中形成一接触窗409，以露出导电层203。在此实施例中，导电层203和反射层205在不同层，且可为相同材料或不同材料。FIG. 3 shows a top emission organicelectroluminescent display 400 according to another embodiment of the present invention, wherein the same reference numerals as those in FIG. 2 represent the same components, which will not be repeated here. The difference between the embodiment in FIG. 3 and the embodiment in FIG. 2 lies in that there is apassivation layer 401 between theconductive layer 203 and thedielectric layer 207 . That is, after theconductive layer 203 is formed, aprotective layer 401 is formed first, and theprotective layer 401 can be silicon oxide, silicon nitride, or a combination of the above materials. Next, areflective layer 405 is formed on theprotective layer 401 at a position opposite to thedisplay area 212 . Next, adielectric layer 207 is formed on theconductive layer 203 , theprotective layer 401 , and thereflective layer 405 . Next, acontact window 409 is formed in thedielectric layer 207 and thepassivation layer 401 to expose theconductive layer 203 . In this embodiment, theconductive layer 203 and thereflective layer 205 are in different layers, and can be made of the same material or different materials.

继续参考图3，和图2相同的，接着，在接触窗409中、导电层203上以及介电层207上形成透明电极层211，而非如图1所示，在接触窗107中、导电层103上以及介电层105上先形成反射层109后再形成透明电极层111。因此，在本发明实施例中，在接触窗409中可避免因金属反射层与透明电极层介面上所生成的金属氧化物而造成电阻上升的问题。此外，相较于图1所示的顶部发光有机电致发光显示器，本发明实施例的反射层405形成在显示区212中以及介电层207之下，介电层207可作为微腔层，使光线在介电层207中产生微腔效应。由于显示区212中透明电极层211与反射层205间隔有一介电层207，因此，有机电致发光层213向下激发的光线的光路经可藉由沉积不同厚度的介电层207进行调变，以透过微腔效应提高显示器400的发光效率及光色度。Continuing to refer to FIG. 3 , the same as in FIG. 2 , then, atransparent electrode layer 211 is formed in thecontact window 409 , on theconductive layer 203 and on thedielectric layer 207 , instead of being in the contact window 107 ,conductive layer 207 as shown in FIG. 1 . The reflective layer 109 is first formed on thelayer 103 and thedielectric layer 105 and then thetransparent electrode layer 111 is formed. Therefore, in the embodiment of the present invention, the problem of resistance increase caused by the metal oxide formed on the interface between the metal reflective layer and the transparent electrode layer can be avoided in thecontact window 409 . In addition, compared with the top emission organic electroluminescent display shown in FIG. 1, thereflective layer 405 of the embodiment of the present invention is formed in thedisplay area 212 and under thedielectric layer 207, and thedielectric layer 207 can be used as a microcavity layer, The light generates a microcavity effect in thedielectric layer 207 . Since there is adielectric layer 207 between thetransparent electrode layer 211 and thereflective layer 205 in thedisplay area 212, the optical path of the light excited downward by theorganic electroluminescent layer 213 can be modulated by depositing adielectric layer 207 with different thicknesses. , to improve the luminous efficiency and light chromaticity of thedisplay 400 through the microcavity effect.

图4显示本发明又一实施例，其中各次像素区中介电层的厚度不同，藉由调整像素中各次像素区中介电层的厚度，以提升显示器的发光效率及光色度。图4显示本发明顶部发光有机电致发光显示器300的剖面图，包括红色次像素区300R、绿色次像素区300G以及蓝色次像素区300B，各次像素区的剖面结构大致如同图2所示。以红色次像素区300R为例，红色次像素区包括一有源元件基板301，其上形成有一导电层303以及反射层305，其中导电层303可为铜或铝，用来作为有机发光显示器像素电极与有源元件基板301中源极/漏极的接点。而反射层305一般优选为铝或银，位于红色次像素区300R中用来反射发光层向下激发的光线，以增加显示器的发光效率。此外，导电层303与反射层305可为相同材料或不同材料，且两者可为同层，可在形成导电层303时同时制作反射层305。虽然图示中导电层303以及反射层305并未相连，但在另一实施例中导电层303以及反射层305可为同层且连续的结构。或者，导电层303与反射层305可为不同层(如图3所示，导电层203和反射层405为不同层)。FIG. 4 shows another embodiment of the present invention, wherein the thickness of the dielectric layer in each sub-pixel region is different, and the luminous efficiency and luminous chromaticity of the display can be improved by adjusting the thickness of the dielectric layer in each sub-pixel region in the pixel. FIG. 4 shows a cross-sectional view of a top-emitting organic electroluminescent display 300 of the present invention, including a red sub-pixel region 300R, a green sub-pixel region 300G, and a blue sub-pixel region 300B. The cross-sectional structure of each sub-pixel region is roughly as shown in FIG. 2 . Taking the red sub-pixel region 300R as an example, the red sub-pixel region includes an active element substrate 301 on which a conductive layer 303 and a reflective layer 305 are formed, wherein the conductive layer 303 can be copper or aluminum, and is used as an OLED pixel. The contact between the electrode and the source/drain in the active element substrate 301 . The reflective layer 305 is generally preferably made of aluminum or silver, and is located in the red sub-pixel region 300R to reflect the light excited downward by the light-emitting layer, so as to increase the luminous efficiency of the display. In addition, the conductive layer 303 and the reflective layer 305 can be made of the same material or different materials, and both can be the same layer, and the reflective layer 305 can be formed at the same time when the conductive layer 303 is formed. Although the conductive layer 303 and the reflective layer 305 are not connected in the figure, in another embodiment, the conductive layer 303 and the reflective layer 305 may be the same layer and a continuous structure. Alternatively, the conductive layer 303 and the reflective layer 305 may be different layers (as shown in FIG. 3 , theconductive layer 203 and thereflective layer 405 are different layers).

在有源元件基板301、导电层303以及反射层305上形成有一介电层307，其材质例如是氧化硅、氮化硅或上述材料的组合。介电层307具有一接触窗309露出导电层303的顶部表面。在介电层307、露出的导电层303以及接触窗309中形成有一透明电极层311，例如是铟锡氧化物(indium tin oxide，ITO)、铟锌氧化物(indium zinc oxide，IZO)、镉锡氧化物(cadmium tin oxide，CTO)、金属偶氮(metallized AZO)、氧化锌(zinc oxide，ZnO)、氮化铟(indiumnitride，InN)或氧化锡(stannum dioxide，SnO₂)，作为有机电致发光显示器300的像素电极，并透过导电层303与有源元件基板301中的源极/漏极电连接。在透明电极层311上红色次像素区300R中形成有有机电致红光发光层313R，并对应至介电层307下方的反射层305，在有机电致发光层313R的周围还包括像素定义层(pixel definition layer)315，用以定义出红色次像素区300R。除了上述结构外，在有机电致发光层上依次形成有上电极、保护层及透明上基板(未显示)。A dielectric layer 307 is formed on the active element substrate 301 , the conductive layer 303 and the reflective layer 305 , and its material is, for example, silicon oxide, silicon nitride or a combination thereof. The dielectric layer 307 has a contact window 309 exposing the top surface of the conductive layer 303 . A transparent electrode layer 311 is formed in the dielectric layer 307, the exposed conductive layer 303 and the contact window 309, such as indium tin oxide (ITO), indium zinc oxide (IZO), cadmium Tin oxide (cadmium tin oxide, CTO), metallized AZO (metallized AZO), zinc oxide (zinc oxide, ZnO), indium nitride (indium nitride, InN) or tin oxide (stannum dioxide, SnO₂ ), as organic electrical The pixel electrode of the luminescence display 300 is electrically connected to the source/drain of the active element substrate 301 through the conductive layer 303 . An organic electroluminescent red light-emitting layer 313R is formed in the red sub-pixel region 300R on the transparent electrode layer 311, and corresponds to the reflective layer 305 below the dielectric layer 307, and a pixel definition layer is also included around the organic electroluminescent layer 313R (pixel definition layer) 315, used to define the red sub-pixel region 300R. In addition to the above structure, an upper electrode, a protective layer and a transparent upper substrate (not shown) are sequentially formed on the organic electroluminescent layer.

如图4所示，像素定义层315定义出红色次像素区300R、绿色次像素区300G、和蓝色次像素区300B。在透明电极层311上，分别在红色、绿色、蓝色次像素区300R、300G、300B内，形成有机电致红光发光层313R、有机电致绿光发光层313G、和有机电致蓝光发光层313B。可依各次像素的有机电的发光层的光色调变各次像素中介电层的厚度，使激发光在介电层中产生微腔效应(microcavity)，以提升显示器的发光效率及色度。依据本发明实施例，以图4为例，可将红色次像素区300R内的介电层307厚度调整为最大，绿色次像素区300G内的介电层307厚度次之，而蓝色次像素区300B内的介电层307厚度可调整为最小。As shown in FIG. 4 , the pixel definition layer 315 defines a red sub-pixel region 300R, a green sub-pixel region 300G, and a blue sub-pixel region 300B. On the transparent electrode layer 311, in the red, green, and blue sub-pixel regions 300R, 300G, and 300B, respectively, an organic electroluminescent red light-emitting layer 313R, an organic electroluminescent green light-emitting layer 313G, and an organic electroluminescent blue light-emitting layer 313R are formed. Layer 313B. The thickness of the dielectric layer in each sub-pixel can be changed according to the light color of the organic light-emitting layer of each sub-pixel, so that the excitation light can generate a microcavity in the dielectric layer, so as to improve the luminous efficiency and chromaticity of the display. According to the embodiment of the present invention, taking FIG. 4 as an example, the thickness of the dielectric layer 307 in the red sub-pixel region 300R can be adjusted to the maximum, the thickness of the dielectric layer 307 in the green sub-pixel region 300G is next, and the thickness of the blue sub-pixel The thickness of the dielectric layer 307 in the region 300B can be adjusted to a minimum.

由本发明实施例可得知，将金属反射层的形成位置移至介电层下方，不但可避免金属反射层与透明电极层间金属氧化物的生成而产生的电阻问题，同时，也可藉由调整反射层与发光层间介电层的厚度来达到光程差控制，使激发光在介电层中产生微腔效应，以增进反射光的增益与色度上的调整。It can be seen from the embodiments of the present invention that moving the formation position of the metal reflective layer to the bottom of the dielectric layer can not only avoid the resistance problem caused by the formation of metal oxide between the metal reflective layer and the transparent electrode layer, but also can The thickness of the dielectric layer between the reflective layer and the light-emitting layer is adjusted to control the optical path difference, so that the excitation light produces a microcavity effect in the dielectric layer, so as to improve the gain of reflected light and the adjustment of chromaticity.

虽然本发明已以优选实施例揭露如上，然其并非用以限定本发明，任何熟习此技艺者，在不脱离本发明的精神和范围内，当可作些许的更动与润饰，因此本发明的保护范围当视后附的权利要求所界定者为准。Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined by the appended claims.