CN107180854A - Color organic light emitting diode display device - Google Patents

Abstract

The invention provides a color organic light emitting diode display device, which comprises a substrate and a plurality of first and second light emitting units arranged on the substrate. The first light-emitting units can be substantially equally divided into a first area, a second area, a third area and a fourth area, the sub-pixels positioned in the first area and the fourth area and the sub-pixels positioned in the second area and the third area are mutually mirror-reflected corresponding relative to the longitudinal axis, or the sub-pixel positioned in the first area and the sub-pixel positioned in the third area are point-symmetrical to the center of the first light-emitting unit, so that the resolution of the color organic light-emitting diode display device is improved.

Description

Color Organic Light Emitting Diode Display Device

This application was filed on March 4, 2013, the application number is 201310068414.3, and the divisional application of the Chinese invention patent application titled "Color Organic Light Emitting Diode Display Device"

technical field

The present invention relates to a color organic light emitting diode display device, in particular to a color organic light emitting diode display device that improves display quality by adjusting the arrangement and configuration of sub-pixels.

Background technique

An OLED is mainly composed of an anode, a cathode, and an organic material layer arranged between the two electrodes, and the luminous intensity of the OLED is related to the magnitude of the current flowing from the anode to the cathode of the OLED. Therefore, if you want the organic light-emitting diode to emit light with higher brightness, you need to provide a larger driving voltage to increase the current flowing through the organic light-emitting diode, and then drive more electron holes to recombine in the organic material layer to generate more Excitons make organic light-emitting diodes emit brighter light.

During the manufacture of OLED display devices, a metal mask (Metal Mask) is required for evaporating organic materials, and the evaporating technology can only achieve about 200-250 pixels per inch (pixels per inch, PPI). Therefore, the pixel density cannot be effectively increased, thereby reducing the resolution of the OLED display, and affecting the yield and competitiveness of the OLED display.

Contents of the invention

In view of this, the present invention provides a color organic light emitting diode display device, which utilizes a special arrangement of sub-pixels to vapor-deposit organic materials on a substrate with pixel electrodes through a traditional metal mask to improve resolution. the goal of.

A color organic light emitting diode display device according to an embodiment of the present invention includes a substrate, a plurality of pixel units, a plurality of first light emitting units and a plurality of second light emitting units. Each pixel unit has a plurality of sub-pixels respectively. A plurality of first light-emitting units are arranged on the substrate in a matrix, and a plurality of second light-emitting units are alternately arranged with the first light-emitting units in a direction parallel to the transverse axis.

Each first light-emitting unit is divided into four areas by a horizontal axis and a vertical axis, and includes a first laser material layer, two second laser material layers and two third laser material layers. Each first, second and third laser material layer corresponds to a plurality of first, second and third sub-pixels respectively. Also, the first lasing material layer overlaps the longitudinal axis. Moreover, the arrangement of the sub-pixels of two adjacent pixel units in the direction parallel to the longitudinal axis corresponds to each other in mirror image.

In some embodiments, one of the two second laser material layers is disposed in the first region, and the other of the two second laser material layers is disposed in the second region, that is, the sub-pixels located in the first and fourth regions The sub-pixels located in the second and third regions correspond to each other as mirror images with respect to the longitudinal axis. In some other embodiments, one of the two second laser material layers is disposed in the first area, and the other of the two second laser material layers is disposed in the third area, that is, the sub-pixels located in the first area and the sub-pixels located in the first area The sub-pixels in the third area are point-symmetrical to the center of the first light-emitting unit.

In the above embodiments, the wavelengths of the light emitted by the excited first, second and third laser material layers are different from each other. Specifically, the main peak wavelength of light emitted by the first laser material layer after being excited ranges from 380 nm to 495 nm, such as blue light; the main peak wavelength of light emitted by the second laser material layer ranges from 580 nm to 495 nm. 700 nanometers, such as red light; the main peak wavelength of light emitted by the third laser material layer after being excited is in the range of 495 nanometers to 590 nanometers, such as green light.

In some embodiments, each first light emitting unit includes a plurality of pixel units, and each pixel unit includes a first sub-pixel, a second sub-pixel and a third sub-pixel. The length of the first sub-pixel in the direction parallel to the longitudinal axis is greater than the lengths of the second and third sub-pixels in the direction parallel to the longitudinal axis. Therefore, in a single pixel unit, the total area of the first sub-pixel is larger than the area of the second sub-pixel, and larger than the area of the third sub-pixel. In other embodiments, each first light-emitting unit includes a plurality of pixel units, and each pixel unit includes two first sub-pixels, a second sub-pixel and a third sub-pixel.

In the above embodiment, each second laser material layer corresponds to four second sub-pixels, and each third laser material layer corresponds to four third sub-pixels.

In the above embodiments, due to the effect of the opening of the metal mask formed by evaporation, the distance between the second laser material layer and the third laser material layer in the direction parallel to the longitudinal axis is larger than that of each second laser material layer. The distance between the second sub-pixels is greater than the distance between the third sub-pixels in each third laser material layer. And, the distance between the second laser material layer or the third laser material layer and one of the most adjacent first laser material layers in the direction parallel to the transverse axis is larger than the second sub-layer in each second laser material layer. The distance between the pixels is greater than the distance between the third sub-pixels in each third laser material layer, and is greater than the distance between the first sub-pixels in each first laser material layer. In addition, the distance between the second laser material layer or the third laser material layer and one of the most adjacent first laser material layers in the direction parallel to the transverse axis is greater than that of the first laser material layer in each first laser material layer. The spacing between pixels.

In some embodiments, the first sub-pixels have substantially the same pitch in a direction parallel to the longitudinal axis. In some other embodiments, the first sub-pixels are repeatedly arranged at a first pitch and a second pitch different from the first pitch along a direction parallel to the longitudinal axis.

In the above embodiments, the first, second, and third sub-pixels are respectively an OLED, wherein the first, second, and third sub-pixels are top-emitting OLEDs or bottom-emitting OLEDs.

In another embodiment of the present invention, a color OLED display device includes: a substrate and a plurality of pixel units. Each pixel unit includes a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the sub-pixel configuration of each pixel unit and the sub-pixel configuration of adjacent pixel units are mirror images of each other .

In the above embodiment, the color OLED display device further includes: a first laser material layer corresponding to a plurality of first sub-pixels, a second laser material layer corresponding to four second sub-pixels, and a pair of second laser material layers corresponding to four of the first sub-pixels. A third layer of laser material for the third sub-pixel. The second sub-pixels are completed by one evaporation process, and the second laser material layer among the four second sub-pixels is continuous. The third sub-pixel is completed by one evaporation process, and the third laser material layer between the four third sub-pixels is continuous.

Description of drawings

FIG. 1 shows a top view of a color OLED display device according to an embodiment of the present invention.

FIG. 2 shows a schematic diagram of first and second light emitting units of a color organic light emitting diode display device according to an embodiment of the present invention.

3A( 1 ), 3A( 2 ), 3B and 3C are schematic diagrams showing a plurality of evaporation hoods according to an embodiment of the present invention.

FIG. 4 shows a schematic diagram of first and second light emitting units of a color OLED display device according to another embodiment of the present invention.

FIG. 5 shows a schematic diagram of the first and second light emitting units of a color OLED display device according to another embodiment of the present invention.

FIG. 6 shows a schematic diagram of the first and second light emitting units of a color OLED display device according to another embodiment of the present invention.

Explanation of component numbers in the figure:

1～Color organic light-emitting diode display device;

10, 10a, 10b, 10c～substrate;

100, 100a, 100b, 100c~the first light emitting unit;

110, 110a, 110b, 110c～the first area;

120, 120a, 120b, 120c～the second area;

130, 130a, 130b, 130c ~ the third area;

140, 140a, 140b, 140c ~ the fourth area;

150, 150c～the first laser material layer;

160～second laser material layer;

170～the third laser material layer;

200, 200a, 200b, 200c~the second light emitting unit;

300, 400, 500 ~ metal mask;

310, 410, 510～opening;

B～the first sub-pixel;

d1, d2, d3, d4～spacing;

d5～the first interval;

d6～second distance;

G～the third sub-pixel;

P～pixel unit;

R～the second sub-pixel;

X～horizontal axis;

Y ~ longitudinal axis.

detailed description

In order to make the purpose, features, and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below, together with the accompanying drawings, FIGS. 1 to 6 , for detailed description. The description of the present invention provides different examples to illustrate the technical features of different implementations of the present invention. Wherein, the configuration of each element in the embodiment is for illustration, not for limiting the present invention. In addition, part of the symbols in the figures in the embodiments are repeated for the purpose of simplifying the description, and do not imply the relationship between different embodiments.

Referring to FIG. 1 , a color OLED display device 1 according to an embodiment of the present invention includes a substrate 10 , a plurality of first light emitting units 100 and a plurality of second light emitting units 200 . A plurality of pixel electrodes (not shown) are formed on the substrate 10 before forming the first light-emitting unit 100 and the second light-emitting unit 200 on the substrate 10, and the pixel electrodes are controlled by appropriate means to be configured for driving a color OLED display device 1 for multiple pixel actions. In this embodiment, the first light-emitting unit 100 and the second light-emitting unit 200 are formed on the pixel electrodes of the substrate 10 by vapor deposition, wherein the first light-emitting units 100 are arranged on the substrate 10 in a matrix, and the second light-emitting units The light-emitting units 200 and the first light-emitting units 100 are arranged alternately in the lateral direction to continuously form a plurality of pixel units P on the substrate 10 .

In detail, referring to FIG. 2, each first light-emitting unit 100 is divided into a first area 110, a second area 120, and a third area by a horizontal axis X and a vertical axis Y perpendicular to the horizontal axis X. 130 and a fourth region 140, wherein the first and third regions 110 and 130 are diagonally located at opposite corners of the first light emitting unit 100, and the second and fourth regions 120 and 140 are diagonally across the first light emitting unit 100 The pair of opposite angles.

Each first light emitting unit 100 includes a first laser material layer 150 , two second laser material layers 160 and two third laser material layers 170 , and each second light emitting unit 200 includes a first laser material layer 150 . The first laser material layer 150 of the first light-emitting unit 100 overlaps on the longitudinal axis Y. As shown in FIG. The two second laser material layers 160 are disposed in the first and second regions 110 and 120 and are separated from the first laser material layer 150 by a distance d1. The second laser material layer 170 is arranged in the third and fourth regions 130, 140 and is separated from the first laser material layer 150 by a first distance d1, and the second laser material layer 160 is parallel to the third laser material layer 170. There is a distance d2 apart in the direction of the axis Y. The first laser material layer 150 of the second light emitting unit 200 has the same arrangement feature as the first laser material layer 150 of the first light emitting unit 100 and is respectively adjacent to a first light emitting unit 100 in the direction of the horizontal axis X.

As shown in FIG. 2, the first, second, and third laser material layers 150, 160, 170 of the first light emitting unit 100 and the first laser material layer 150 of the second light emitting unit 200 respectively correspond to a plurality of first, The second and third sub-pixels B, R, G, wherein each first laser material layer 150 corresponds to a plurality of first sub-pixels B with a distance d4 from each other, and each second laser material layer 160 corresponds to four The second sub-pixels R are separated by a distance d3, and each third laser material layer 170 corresponds to four third sub-pixels G separated by a distance d3 from each other. In this embodiment, the light emitted by the first laser material layer 150 after being excited is blue light, the light emitted by the second laser material layer 160 after being excited is red light, and the light emitted by the third laser material layer 170 after being excited is blue light. The light is green.

Those skilled in the art can understand that although the first, second, and third laser material layers 150 , 160 , and 170 are continuously and extendedly laid on the above-mentioned regions of the substrate 10 , only the pixel electrodes on the substrate 10 The first, second and third sub-pixels B, R and G (not shown) can be excited by current to emit light of corresponding wavelength. Therefore, in FIG. 1 , the first, second, and third laser material layers 150 , 160 , and 170 are represented by dotted lines, while the sub-pixels R, G, and B that actually have light-emitting functions are represented by solid lines.

On the whole, the sub-pixels located in the first and fourth regions 110, 140 and the sub-pixels located in the second and third regions 120, 130 correspond to each other as mirror images with respect to the longitudinal axis Y, so that two pixel units P Defined on both sides of the longitudinal axis Y, wherein each pixel unit P includes a first sub-pixel B, a second sub-pixel R and a third sub-pixel G. In addition, referring to FIGS. 1 and 2 at the same time, it can be understood that the first light emitting unit 100 is further connected to the second light emitting unit 200 adjacent to the horizontal axis X direction and the first light emitting unit 100 adjacent to the longitudinal axis Y direction. A plurality of pixel units P are formed, and the configurations of the first, second and third sub-pixels B, R and G of two adjacent pixel units P in the direction parallel to the longitudinal axis Y are mirror images.

In order to overcome the shortcoming that the blue laser material is easily damaged under high current operation, the present embodiment provides the following methods to solve this problem. As shown in Figure 2, the length of the first sub-pixel B in the direction of the longitudinal axis Y is greater than that of the second sub-pixel R and the third sub-pixel G in the direction of the longitudinal axis Y, and in a single pixel unit P, the length of the first sub-pixel The area of the pixel B is larger than the area R of the second sub-pixel, and larger than the area G of the third sub-pixel. Therefore, the first sub-pixel B can be applied with a smaller current than the second sub-pixel R and the third sub-pixel G to emit light with the same brightness.

2, 3A(1)-3C, the manufacturing method of the color organic light emitting diode display device 1 of the present invention is described as follows. First, a driving circuit and a pixel electrode (not shown) are formed on the substrate 10, and metal masks 300, 400 and 500 are provided as shown in FIGS. not shown) on the substrate 10. Specifically, the metal mask 300 includes a strip-shaped opening 310, and the area and position of the opening 310 correspond to the area and position of the first laser material layer 150; the metal mask 400 includes two rectangular openings 410, and the area and position of the opening 410 The area and position correspond to the area and position of the second laser material layer 160 ; the metal mask 500 includes two strip-shaped openings 510 , and the area and position of the openings 510 correspond to the size and position of the third laser material layer 170 .

To reserve alignment tolerances, the pitches between the first, second, and third laser material layers 150 , 160 , and 170 are larger than the pitches of the respective internal sub-pixels. Specifically, the distance d2 between the second laser material layer 160 and the third laser material layer 170 in the direction parallel to the longitudinal axis is greater than the distance between the second sub-pixels R in each second laser material layer 160 d3, and is greater than the distance d3 between the third sub-pixels G in each third laser material layer 170 . Moreover, the distance d1 between the second laser material layer 160 or the third laser material layer 170 and the most adjacent first laser material layer 150 in the direction parallel to the transverse axis X is greater than that in each second laser material layer 160 The distance d3 between the second sub-pixels R is greater than the distance d3 between the third sub-pixels G in each third laser material layer 170 . In addition, the distance d1 between the second laser material layer 160 or the third laser material layer 170 and the most adjacent first laser material layer 150 in the direction parallel to the transverse axis X is larger than the first laser material layer 150 in the first laser material layer 150. The distance between the sub-pixels B is d4.

It should be noted that the above-mentioned metal masks 300 , 400 and 500 have a resolution of about 200 pixels per inch (PPI), which are commonly used metal masks. In a specific embodiment, the distance d1 is 24.3±12 microns; the distance d2 is 23.0±12 microns; the distance d3 is 8±12 microns; and the distance d4 is 14±12 microns. The width of each pixel unit P is 55±12 μm, so that the color OLED display device 1 has a resolution of about 460 pixels per inch (PPI).

Referring to FIG. 4 , it shows a schematic diagram of the first and second light emitting units 100 a and 200 a of a color OLED display device according to another embodiment of the present invention. In FIG. 4, the same or similar elements as those in FIG. 2 will be given similar reference numerals, and their features will not be described again. The difference between the first and second light emitting units 100a and 200a and the first and second light emitting units 100 and 200 is that the second laser material layer 160 is arranged in the second and fourth regions 120a and 140a, and the two third laser The material layer 170 is disposed in the first and third regions 110a and 130a, that is, the sub-pixels in the first region 110a and the sub-pixels in the third region 130a are point-symmetrical to the center of the first light emitting unit 100a. With this configuration, the metal mask used for evaporating the second laser material layer 160 and the third laser material layer 170 can have stronger structural strength because the openings are arranged in a staggered manner.

Referring to FIG. 5 , it shows a schematic diagram of the first and second light emitting units 100 b and 200 b of a color OLED display device according to another embodiment of the present invention. Components in FIG. 5 that are the same as or similar to those in FIG. 2 will be given similar reference numerals, and their features will not be described again. The difference between the first and second light emitting units 100b and 200b and the first and second light emitting units 100 and 200 is that each pixel unit P includes two first sub-pixels B, a second sub-pixel R and a third sub-pixel pixel G, thereby uniformizing the brightness of each pixel.

Referring to FIG. 6 , it shows a schematic diagram of the first and second light emitting units 100c and 200c of a color OLED display device according to another embodiment of the present invention. Components in FIG. 6 that are the same as or similar to those in FIG. 2 will be given similar reference numerals, and their features will not be described again. The difference between the first and second light-emitting units 100c and 200c and the first and second light-emitting units 100 and 200 is that the first sub-pixels B of the first laser material layer 150c are repeatedly separated by a first distance d5 and a distance different from The first distance d5 and the second distance d6 are arranged in a direction parallel to the longitudinal axis Y. During manufacture, the opening of the metal mask used for evaporating the first laser material layer 150c of this embodiment is shown in FIG. 3A(2).

The present invention improves the resolution of the color organic light emitting diode display device without changing the existing process equipment by means of the arrangement of sub-pixel units, so as to improve the competitiveness of this kind of color organic light emitting diode display device.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.

Claims (12)

1. a kind of color organic light emitting diode display device, including：

One substrate；And

Multiple first luminescence units are arranged on the substrate in a matrix fashion, and each of which first luminescence unit is by a transversal line A first area, a second area, one the 3rd region and one the 4th region are divided into a longitudinal axis of the vertical transversal line, its In the first, the 3rd region be located at a relative angle of first luminescence unit respectively, each of which first luminescence unit includes： Multiple sub-pixels, the plurality of sub-pixel includes multiple first sub-pixels, multiple second sub-pixels and multiple 3rd sub-pixels, The sub-pixel of wherein at least one first, at least one second sub-pixel and at least one the 3rd sub-pixel constitute a pixel cell,

A wherein first laser material layer correspond to those the first sub-pixels at least one, wherein the first laser material layer with The longitudinal axis line overlap, and the transversal line is overlapping with least one first sub-pixel；

Wherein positioned at the adjacent pixel unit of longitudinal axis both sides two sub-pixel relative to the longitudinal axis be mirror correspondingly, and be located at An at least sub-pixel for the first area and at least another sub-pixel point symmetry with same color positioned at the 3rd region In the center of first luminescence unit.

2. color organic light emitting diode display device as claimed in claim 1, it is characterised in that first sub-pixel, should Second sub-pixel and the 3rd sub-pixel have different colours.

3. color organic light emitting diode display device as claimed in claim 2, it is characterised in that first sub-pixel is sent Light be blue light, the light that second sub-pixel is sent be feux rouges, the light that the 3rd sub-pixel is sent be green glow.

4. color organic light emitting diode display device as claimed in claim 3, it is characterised in that in single pixel cell In, the area of first sub-pixel is more than the area of the 3rd sub-pixel.

5. color organic light emitting diode display device as claimed in claim 2, it is characterised in that

Wherein one of one of those second sub-pixels and those the 3rd sub-pixels are located at the first area and the 4th respectively Region, and the another one of those the second sub-pixels and those the 3rd sub-pixels another one be located at respectively the second area and this Three regions.

6. color organic light emitting diode display device as claimed in claim 1, it is characterised in that

One first sub-pixel, second sub-pixel, and two the 3rd sub-pixels constitute the pixel cell.

7. color organic light emitting diode display device as claimed in claim 1, it is characterised in that

Positioned at least one and those first sub-pixels positioned at the 3rd region of those the first sub-pixels of the first area At least another one point symmetry in the center of first luminescence unit.

8. color organic light emitting diode display device as claimed in claim 1, it is characterised in that

Positioned at least one and those second sub-pixels positioned at the 3rd region of those the second sub-pixels of the first area At least another one point symmetry in the center of first luminescence unit.

9. color organic light emitting diode display device as claimed in claim 1, it is characterised in that

Positioned at least one and those the 3rd sub-pixels positioned at the 3rd region of those the 3rd sub-pixels of the first area At least another one point symmetry in the center of first luminescence unit.

10. color organic light emitting diode display device as claimed in claim 1, it is characterised in that first luminescence unit Also include：

Two second laser material layers, corresponding at least 2 second sub-pixels；And

2 the 3rd laser materials layer, corresponding at least 2 the 3rd sub-pixels, wherein one of the two second lasers material layer and this One of 2 the 3rd laser materials layer is each located in the first, the 4th region one of which, and the two second lasers material layer The another one of another one and 2 the 3rd laser material layer be each located in second, third region one of which.

11. color organic light emitting diode display device as claimed in claim 10, it is characterised in that the first laser material The wavelength for the light that layer, the second laser material layer and the 3rd laser material layer are sent after being stimulated is different from each other.

12. color organic light emitting diode display device as claimed in claim 11, it is characterised in that the first laser material The light that layer is sent after being stimulated is blue light, and the light that the second laser material layer is sent after being stimulated is feux rouges, and the 3rd swashs The light that optical material layer is sent after being stimulated is green glow.