Patent Publication Number: US-2007096632-A1

Title: Parallel Full-Color Organic Light-Emitting Display Device and a Manufacturing Method Thereof

Description:
RELATED APPLICATIONS  
      The present application is based on, and claims priority from, Taiwan Application Serial Number 94137631, filed Oct. 27, 2005, the disclosure of which is hereby incorporated by reference herein in its entirety.  
     BACKGROUND  
      1. Field of Invention  
      The present invention relates to an improved parallel full-color organic light-emitting display (OLED) device and a manufacturing method thereof, which not only improves the transmission and the color saturation of each light source, but also improves the yield.  
      2. Description of Related Art  
      The way in which full color display is achieved on a display device determines the success or failure of the device. Two methods used for achieving full color display on an OLED display are listed below:  
      1. Individual R, G, B pixels method: the organic light-emitting components of red, green and blue are disposed side by side. By mixing the three colored lights generated by those organic light-emitting components, full-color display can be achieved.  
      However, the individual R, G, B pixels display needs several evaporating steps and mask aiming steps to produce organic light-emitting layers of different colors, which complicates the process and makes the evaporating steps and mask aiming steps more difficult such that the yield decreases and the cost increases.  
      2. Color filter method: at least one organic light-emitting layer which generates a white light is disposed, and a sophisticated color filter is used. The white light is filtered by the color filter to achieve full-color display.  
      When a display device uses a color filter to generate a full-color display, a large portion of white light is filtered out causing insufficient brightness and wasting power.  
       FIG. 1  shows the sectional drawing of a conventional OLED device of the individual R, G, B pixels display, the OLED device  200  has an organic light-emitting layer  23  disposed on the substrate  11 , the organic light-emitting layer  23  includes a first organic light-emitting layer  231 , a second organic light-emitting layer  233  and a third organic light-emitting layer  235 . The first light source S 1 , the second light source S 2  and the third light source S 3  respectively generated by the first organic light-emitting layer  231 , the second organic light-emitting layer  233  and the third organic light-emitting layer  235  are independent red, green and blue lights. By mixing the red, green and blue lights appropriately, the OLED device  200  can have a full-color display.  
      Before the organic light-emitting layer  23  is disposed on the substrate  11 , masks aiming processes are needed. The disposing of the organic light-emitting layer  23  could be affected if there is an inaccuracy during the masks aiming processes. For example, if there is an inaccuracy during the masks aiming processes of the second organic light-emitting layer  233 , the position of the second organic light-emitting layer  233  can be incorrect and an error area  239  produced. Because the second organic light-emitting layer  233  doesn&#39;t cover the error area  239 , the error area  239  cannot generate the second light source S 2  such that the operation area of the second organic light-emitting layer  233  is reduced, and the brightness of the second light source S 2  and the displaying quality of the display is affected.  
      For the foregoing reasons, there is a need for a new improved parallel full-color organic light-emitting display device, which can overcome the yield loss caused by the evaporating and the mask aiming processes such that the cost can be reduced and the yield can be improved. In addition, the light transmission and the color saturation can be improved, which are the main improvements of the present invention.  
     SUMMARY  
      According to one embodiment of the present invention, an improved parallel full-color organic light-emitting display (OLED) device, with a plurality of pixels disposed on a substrate. Each of the pixels includes a first electrode, a first organic light-emitting layer, a second organic light-emitting layer, a third organic light-emitting layer, a fourth organic light-emitting layer and a second electrode; the first electrode disposed on the substrate defined as a first sub-pixel area, a second sub-pixel area and a third sub-pixel area; the first organic light-emitting layer, the second organic light-emitting layer and the third organic light-emitting layer are disposed on the first sub-pixel area, the second sub-pixel area and the third sub-pixel area individually; the fourth organic light-emitting layer is disposed above the first sub-pixel area, the second sub-pixel area and the third sub-pixel area; the second electrode is disposed on the first organic light-emitting layer, the second organic light-emitting layer, the third organic light-emitting layer and the fourth organic light-emitting layer.  
      According to another embodiment of the present invention, an improved parallel full-color OLED device with a plurality of pixels disposed on a substrate, each of the pixels includes a first electrode, a first organic light-emitting layer, a second organic light-emitting layer, a fourth organic light-emitting layer and a second electrode. The first electrode is defined as a first sub-pixel area, a second sub-pixel area and a third sub-pixel area disposed on the substrate; the first organic light-emitting layer and the second organic light-emitting layer are disposed on the first sub-pixel area and the second sub-pixel area individually; the fourth organic light-emitting layer is disposed on the first sub-pixel area, the second sub-pixel area and the third sub-pixel area; the second electrode is disposed on the first organic light-emitting layer, the second organic light-emitting layer and the fourth organic light-emitting layer.  
      According to another embodiment of the present invention, the forming method of a pixel of an improved parallel full-color OLED device includes forming a first electrode on the substrate; defining a first sub-pixel area, a second sub-pixel area and a third sub-pixel area of the first electrode; covering the second sub-pixel area and the third sub-pixel area with a first mask; aiming the first sub-pixel area with a first evaporating source, and evaporating a first organic light-emitting layer to form the first organic light-emitting layer; covering the first sub-pixel area and the third sub-pixel area with a second mask; aiming the second sub-pixel area with a second evaporating source, and evaporating a second organic light-emitting layer to form the second organic light-emitting layer; aiming the first sub-pixel area, the second sub-pixel area and the third sub-pixel area with a fourth evaporating source and a fully open mask, evaporating a fourth organic light-emitting layer to form the fourth organic light-emitting layer; and forming a second electrode above the first organic light-emitting layer, the second organic light-emitting layer and the fourth organic light-emitting layer.  
      It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the invention as claimed. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings where:  
       FIG. 1  is the sectional drawing of conventional OLED device;  
       FIG. 2  is the sectional drawing of the improved parallel full-color OLED device according to one embodiment of the present invention;  
       FIG. 2A  is the sectional drawing of one embodiment of the present invention;  
       FIG. 3  is the sectional drawing of another embodiment of the present invention;  
       FIG. 4  is the sectional drawing of another embodiment of the present invention;  
       FIG. 5  is the sectional drawing of another embodiment of the present invention; and  
       FIG. 6A ,  FIG. 6B ,  FIG. 6C ,  FIG. 6D  are the sectional drawings of each process steps according to another embodiment of the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.  
       FIG. 2  and  FIG. 2A  show the sectional drawings of the improved parallel full-color OLED device according to one embodiment of the present invention. To describe the embodiments of the presentation invention clearly, the drawings here show a single pixel. The OLED device  400  essentially includes a substrate  31  and an organic light-emitting component  40 ; the organic light-emitting component  40  includes a first electrode  41 , an organic light-emitting layer  43  and a second electrode  45 . The organic light-emitting layer  43  includes a first organic light-emitting layer  431 , a second organic light-emitting layer  433 , a third organic light-emitting layer  435  and a fourth organic light-emitting layer  437 .  
      The first electrode  41 , is defined as a first sub-pixel area  411 , a second sub-pixel area  413  and a third sub-pixel area  415 , disposed on the substrate  31 . The first organic light-emitting layer  431  is disposed on the first sub-pixel area  411 , the second organic light-emitting layer  433  is disposed on the second sub-pixel area  413 , the third organic light-emitting layer  435  is disposed on the third sub-pixel area  415 , the fourth organic light-emitting layer  437  is disposed above the first sub-pixel area  411 , the second sub-pixel area  413  and the third sub-pixel area  415 . The first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437  are overlapped, so the fourth organic light-emitting layer  437  can be disposed above or under the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435 . The second electrode  45  is disposed above the first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437 .  
      The OLED device  400  further includes a color filter  30  formed between the substrate  31  and the organic light-emitting component  40 . The color filter  30  includes a black matrix  33  formed on the substrate  31 . The first color filter layer  35  (photo resist) formed on the black matrix  33  and the substrate  31  filters the light. The first color filter layer  35  includes a first photo resist  351  (such as R), a second photo resist  353  (such as G) and a third photo resist  355  (such as B). An over coat barrier unit  37  formed on the black matrix  33  and first color filter layer  35  can be an over coat or a barrier layer or both.  
      A first photo resist  351 , a second photo resist  353  and a third photo resist  355  correspond to the vertical extension regions of the first sub-pixel area  411 , the second sub-pixel area  413  and the third sub-pixel area  415  respectively.  
      Thus, the first light source S 1  generated by the first organic light-emitting layer  431  and the fourth organic light-emitting layer  437  can pass through the first photo resist  351  such that a filtered first color light L 1  is generated, in which the first organic light-emitting layer  431  and the fourth organic light-emitting layer  437  are overlapped; the second light source S 2  generated by the second organic light-emitting layer  433  and the fourth organic light-emitting layer  437  can pass through the second photo resist  353  such that a filtered second color light L 2  is generated, in which second organic light-emitting layer  433  and the fourth organic light-emitting layer  437  are overlapped; the third light source S 3  generated by the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437  can pass through the third photo resist  355  such that a filtered third color light L 3  is generated, in which the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437  are overlapped. By mixing the first color light L 1 , the second color light L 2  and the third color light L 3 , a full-color OLED device  400  can be achieved. The color shift caused by different attenuation effect of the light sources can be eliminated with the disposing of the color filter  30  and the fourth organic light-emitting layer  437 .  
      As shown in  FIG. 2 , the first organic light-emitting layer  431  generates a red light source or an orange light source; the second organic light-emitting layer  433  generates a green light source; the third organic light-emitting layer  435  generates a blue light source; and the fourth organic light-emitting layer  437  generates a white light source. The first photo resist  351 , the second photo resist  353  and the third photo resist  355  are a red resist R ( 351 ), a green resist G ( 353 ) and a blue resist B ( 355 ) respectively. The first color light L 1 , the second color light L 2  and the third color light L 3  are red, green and blue lights respectively.  
      Only light with specific wavelengths can pass through the first color filter layer  35 , which can be used to filter the lights. For example, when the white light source tries to pass through the photo resist  351 , if light with wavelengths in the visible wavelength range of 640 nm˜770 nm can pass through the first photo resist  351 , then only light with wavelengths in the range 640 nm˜770 nm can pass through the photo resist  351 , all the other lights are blocked. As a result, the light can be filtered. However, when white light is displayed, the brightness is reduced. Because all the other lights are blocked by the photo resist  351  except lights with wavelengths in the range of 640 nm˜770 nm, when white light tries to pass the photo resist  351 , only 25% of white light can pass through the photo resist  351 , reducing the brightness.  
      On the contrary, because lights with wavelengths in the range 640nm˜770 nm can pass through the first photo resist  351 , a large portion (above 80%) of the red light which has a wavelength in the range 650˜760 can pass through the first photo resist  351 .  
      By disposing the fourth organic light-emitting layer  437 , the yield loss caused by the inaccurate masks aiming process during the disposing of the first organic light-emitting layer  431 , the second organic light-emitting layer  433  or the third organic light-emitting layer  435  can be overcome. As shown in  FIG. 2A , if the second organic light-emitting layer  433  is inaccurate during the mask aiming process, an error area  439  located on the vertical extension region of the second photo resist  353 , which doesn&#39;t have the second organic light-emitting layer  433  disposed on it, is produced. Luckily, because the fourth organic light-emitting layer  437  covers the second organic light-emitting layer  433  such that the fourth organic light-emitting layer  437  also covers the error area  439 , so the fourth light source S 4  generated by the fourth organic light-emitting layer  437  disposed on the error area  439  can go from the first electrode  41  and pass through the second photo resist  353 . In addition, if the fourth light source S 4  is a white light source, the second color light L 2  with a wavelength allowable by the second photo resist  353  (the second photo resist  353  can transmit lights with such wavelength) is generated after the white light passes the second photo resist  353 .  
      Therefore, the yield loss can be overcome by disposing the fourth organic light-emitting layer  437 , in which the yield loss is due to the inaccurate masks aiming process while disposing the first organic light-emitting layer  431 , the second organic light-emitting layer  433  or the third organic light-emitting layer  435 . In other words, even if the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435  are inaccurately disposed, the display quality won&#39;t be affected, so the yield can be improved.  
      In this embodiment, the OLED device  400  further includes several thin film transistors (not shown), each of the thin film transistors is electrically connected to the first electrode  41  of the first sub-pixel area  411 , the second sub-pixel area  413  or the third sub-pixel area  415  to form an active matrix OLED device  400 . The active matrix OLED device can be formed by a color-filter-on-array (COA) method or by array-on-color-filter (AOC) method.  
       FIG. 3  shows the sectional drawings according to another embodiment of the present invention. Because the disposing of the substrate  31 , the disposing of the color filter  30  and the first electrode  41  of the OLED device  401  are the same with those disposing of the OLED device  400 , so the description of the disposing is skipped. As shown in  FIG. 3  the first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437  of the organic light-emitting component  40  can be chosen from one of: a hole injection layer  432 , a hole transport layer  434 , an electron transport layer  436 , an electron injection layer  438  and a combination thereof. For example, the hole injection layer  432  and the hole transport layer  434  can initially be disposed on the first electrode  41 , then the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435  can be disposed on the hole transport layer  434 . Next, the fourth organic light-emitting layer  437  can be disposed above the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435 . Finally, the Electron Transport Layer  436  and the Electron Injection Layer  438  are disposed on the fourth organic light-emitting layer  437 . The hole injection layer  432 , the hole transport layer  434 , the Electron Transport Layer  436 , and the Electron Injection Layer  438  are disposed between the first electrode  41  and the second electrode  45 .  
      The first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437  can be a single layer type or a multiple layer type. For example, the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435  are single layer types, and the fourth organic light-emitting layer  437  is a multiple layer type.  
      The first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437  can also be a doped organic light-emitting layer composed of at least one Host Emitter doped with a Dopant, which can also generate various color light sources.  
       FIG. 4  shows the sectional drawings of another embodiment of the present invention. The OLED device  403  includes a substrate  31  and an organic light-emitting component  40 , which have the same disposing with the substrate  31  and organic light-emitting component  40  as shown in  FIG. 2 . A seal panel  39  is disposed on the substrate  31  which doesn&#39;t have an organic light-emitting component  40  disposed on it, thus the organic light-emitting component  40  can be protected by the disposing of the seal panel  39 . A second color filter layer  38 , disposed on the bottom of the seal panel  39 , has a fourth photo resist  381 , a fifth photo resist  383  and a sixth photo resist  385 , in which the fourth photo resist  381 , the fifth photo resist  383  and the sixth photo resist  385  correspond to vertical extension regions of the first sub-pixel area  411 , the second sub-pixel area  413  and the third sub-pixel area  415  individually. Because the first light source S 1 , the second light source S 2  and the third light source S 3  generated by the organic light-emitting component  40  are filtered by the second color filter layer  38 . The second electrode  45  can be made with a transparent conductive material such that the first light source S 1 , the second light source S 2  and the third light source S 3  can transmit the second electrode  45 , which together make the OLED device  403  a top-emission device.  
      Again, the yield loss can be overcome and the yield can be improved by disposing the fourth organic light-emitting layer  437 , in which the yield loss is due to the inaccurate masks aiming process when the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435  are disposed.  
      The OLED device  403  further includes several thin film transistors (not shown), each of the thin film transistors is electrically connected to the first electrode  41  of the first sub-pixel area  411 , the second sub-pixel area  413  or the third sub-pixel area  415  to form the Active Matrix OLED device  403 .  
      Please refer to  FIG. 2  and  FIG. 4  simultaneously. As shown in  FIG. 4 , if there was a color filter  30  (not shown), with a color filter layer  35  (not shown), disposed between the substrate  31  and the organic light-emitting component  40 , the OLED device  403  became a bottom-emission OLED device  400  as shown in  FIG. 2 . Likewise, the OLED device  400  as shown in  FIG. 2  becomes the top-Emission OLED device  403  as shown in  FIG. 4  if the seal panel  39 , with the second color filter layer  38  disposed under it, is disposed on the substrate  31  of OLED device  400 . Of course, the seal panel  39 , with the second color filter layer  38  disposed under it, can be disposed on the substrate  31  to cover the organic light-emitting component  40  simultaneously when the color filter  30  with the first color filter layer  35  is disposed between the substrate  31  and the organic light-emitting component  40 , to obtain the double-faced OLED device.  
      Several thin film transistors can also be disposed in the OLED device, which can have light emission in both directions, in which each of the thin film transistors is electrically connected to the first electrode  41  of the first sub-pixel area  411 , the second sub-pixel area  413  or the third sub-pixel area  415 .  
       FIG. 5  shows the sectional drawings of another embodiment of the present invention. The disposing of the substrate  31  and an organic light-emitting component  40  of OLED device  405  is the same with the disposing of the substrate  31  and organic light-emitting component  40  of OLED device  400  as shown in  FIG. 2 . The difference between  FIG. 5  and  FIG. 2  is that the organic light-emitting layer  43  of the organic light-emitting component  40  in the OLED device  405  includes only the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the fourth organic light-emitting layer  437 .  
      In  FIG. 5 , the organic light-emitting component  30  includes the first electrode  41 , the organic light-emitting layer  43  and the second electrode  45 . The first sub-pixel area  411 , the second sub-pixel area  413  and third sub-pixel area  415  are defined on the first electrode  41 . The first organic light-emitting layer  431  is disposed on the first sub-pixel area  411 , and the second organic light-emitting layer  433  is disposed on the second sub-pixel area  413 . The fourth organic light-emitting layer  437  is disposed above the first sub-pixel area  411 , the second sub-pixel area  413  and third sub-pixel area  415 . The disposing between the first organic light-emitting layer  431  and the fourth organic light-emitting layer  437 , and the disposing between the second organic light-emitting layer  433  and the fourth organic light-emitting layer  437  are overlapped such that the fourth organic light-emitting layer  437  can be disposed on the first organic light-emitting layer  431  and the second organic light-emitting layer  433 . The second electron  45  can be disposed on the organic light-emitting layer  43 .  
      The OLED device  405  further includes a color filter  30 , with the same disposing as shown in  FIG. 2 , is formed between the substrate  31  and the organic light-emitting component  40 . The structure of color filter  30  of the OLED device  405  is the same as that shown in  FIG. 2 , so the detail description can be skipped.  
      The first light source S 1  generated by the first organic light-emitting layer  431  can be a red light source or an orange light source, the second light source S 2  generated by the second organic light-emitting layer  433  can be a blue light source, and the fourth light source S 4  generated by the fourth organic light-emitting layer  437  can be a white light source. The fourth organic light-emitting layer  437  can be a multiple layer type organic light-emitting layer. By mixing different colors generated by different layers, a white light source can be produced. For example, if the fourth organic light-emitting layer  437  is a two layer type organic light-emitting layer, in which one layer is used to generate the blue light source, the other is used to generate the orange, the yellow or the red light source. By mixing the light source generated by these two layers, the fourth light source S 4  generated by the fourth organic light-emitting layer  437  can be a white light source.  
      According to the description stated above, the embodiment shown in  FIG. 5  can be designed as a bottom-emission or a double-faced OLED device. The bottom-emission OLED device can be made by disposing the seal panel  39 , with the second color filter layer  38 , on the substrate  31  to cover the organic light-emitting component  40 , in which the color filter  30  with the color filter layer  35  not disposed between the substrate  31  and the organic light-emitting component  40 . The double-faced OLED device needs both the seal panel  39 , with the second color filter layer  38 , and the color filter  30 , with the first color filter layer  35 .  
      In this embodiment (shown in  FIG. 5 ), several thin film transistors can also be disposed in the OLED device  405 , in which each of the thin film transistors is electrically connected to the first electrode  41  of the first sub-pixel area  411 , the second sub-pixel area  413  or the third sub-pixel area  415 , which forms the active matrix OLED device  405 .  
       FIG. 6A  to  FIG. 6D  show the sectional drawings of the evaporating processes of the improved parallel OLED device of embodiments of the present invention. The manufacturing steps of OLED device  400  essentially includes: after the first electrode  41  has been disposed, the hole injection layer  432  or the hole transport layer  434  is disposed on the first electrode  41  by evaporating. And the first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third organic light-emitting layer  435  and the fourth organic light-emitting layer  437  are disposed on the hole transport layer  434 . The first sub-pixel area  411 , the second sub-pixel area  413  and third sub-pixel area  415  are defined on the first electrode  41 .  
      Refer to  FIG. 6A . In the beginning, a first mask  481  is disposed on the vertical extension of the second sub-pixel area  413  and of the third sub-pixel area  415 , then evaporating the first organic light-emitting layer  431  with a first evaporating source  471 . As a result, the first organic light-emitting layer  431  is formed on the first electrode  41 , which is on the vertical extension region of the first sub-pixel area  411 . The first organic light-emitting material  461  of the first evaporating source  471  is selected according to the color of the first photo resist  351 . For example, if the first photo resist  351  is a red resist, an organic light-emitting material which generates the red light source is chosen as the first organic light-emitting material  461 .  
      Refer to  FIG. 6B . In addition, after a second mask  483  has been disposed on the vertical extension regions of the first sub-pixel area  411  and of the third sub-pixel area  415 , the second organic light-emitting layer  433  is evaporated with a second evaporating source  473 . As a result, the second organic light-emitting layer  433  is formed on the first electrode  41 , which is on the vertical extension region of the second sub-pixel area  413 . The second organic light-emitting material  463  of the second evaporating source  473  is selected according to the color of the second photo resist  353 . For example, if the second photo resist  353  is a green resist, an organic light-emitting material which generates the green light source is chosen as the second organic light-emitting material  463 .  
      Refer to  FIG. 6C . After a third mask  485  has been disposed on the vertical extension region of the first sub-pixel area  411  and of the second sub-pixel area  413 , the third organic light-emitting layer  435  is evaporated with a third evaporating source  475 . As a result, the third organic light-emitting layer  435  is formed on the first electrode  41 , which is on the vertical extension region of the third sub-pixel area  415 . The third organic light-emitting material  465  of the third evaporating source  475  is selected according to the color of the third photo resist  355 . For example, if the third photo resist  355  is a blue resist, an organic light-emitting material which generates the blue light source is chosen as the third organic light-emitting material  465 .  
      Refer to  FIG. 6D . When the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435  have been disposed, the fourth organic light-emitting layer  437  is evaporated with a fourth evaporating source  477  and a fully-open mask  487 . The fourth organic light-emitting layer  437  is formed on the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third organic light-emitting layer  435 . A light-emitting material which generates the white light source is chosen as the fourth organic light-emitting material  467  of the fourth evaporating source  477 .  
      Obviously, the disposing sequence of the first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third second organic light-emitting layer  435  and the fourth second organic light-emitting layer  437  can be changed when it comes to practical applications. For example, the fourth organic light-emitting layer  437  can be disposed first, followed by the disposing of the first organic light-emitting layer  431 , the second organic light-emitting layer  433  and the third second organic light-emitting layer  435 .  
      After the first organic light-emitting layer  431 , the second organic light-emitting layer  433 , the third organic light-emitting layer  435  have been disposed, some other manufacturing processes of the OLED device  400  can be continued. For example, the electron transport layer  436  and/or the electron injection layer  438  and the second electrode  45  are formed in order on the fourth second organic light-emitting layer  437  by evaporating, as the dash lines shown in  FIG. 6D , which accomplishes the manufacturing process of the OLED device  400 .  
      As the embodiment shown in  FIG. 5 , the first electrode  41  can be disposed on the substrate  31  by evaporating. After that, the first mask is disposed on the vertical extension regions of the second sub-pixel area  413  and the third sub-pixel area  415 , then the first organic light-emitting layer  431  is evaporated with a first evaporating source. After the first organic light-emitting layer  431  has been formed, the second mask is disposed on the vertical extension regions of the first sub-pixel area  411  and the third sub-pixel area  415 , then the second organic light-emitting layer  433  is evaporated with a second evaporating source. After that, the fourth organic light-emitting layer  437  is evaporated with a fourth evaporating source and a fully-open mask to form the fourth organic light-emitting layer  437  on the vertical extension regions of the first sub-pixel area  411 , the second sub-pixel area  413  and the third organic light-emitting layer  435 . Finally, the second electrode  45  is formed on the organic light-emitting layer  43 .  
      Compared with the conventional OLED devices formed by R, G, B organic light-emitting components disposed individually, the yield loss of the OLED device  400  caused by the inaccurate masks aiming process can be improved by using the evaporating process which evaporates the organic light-emitting layer  43  as stated above.  
      Obviously, the manufacturing process stated above can also be used in Active Matrix OLED device, so the detail description is omitted.  
      In total, according to the embodiments of the present invention, the light transmission and the color saturation can be improved. In addition, the yield loss caused by the evaporating and the mask aiming processes can be overcome such that the productive can be promoted.  
      Any element in a claim that does not explicitly state “means for” performing a specified function, or “step for” performing a specific function, is not to be interpreted as a “means” or “step” clause as specified in 35 USC § 112, ¶6. In particular, the use of “step of” in the claim herein is not intended to invoke the provisions of 35 USC § 112, ¶6.  
      It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.