TWM572073U - Pixel structure and OLED display panel - Google Patents

Abstract

The present invention proposes a pixel structure and an OLED display panel, the pixel structure including a plurality of pixel unit groups, each of the pixel unit groups including adjacent ones in a first direction and offset in a second direction perpendicular to the first direction a first pixel unit and a second pixel unit, the first pixel unit and the second pixel unit respectively comprising three different color sub-pixels disposed along the second direction, respectively belonging to the first pixel unit The distance between the two sub-pixels of the same color of the second pixel unit in the first direction and the distance in the second direction are equal. The creation is compact and reduces the pixel pitch, and at the same time improves the PPI; improves the display resolution and yield of the screen, and reduces the difficulty of the evaporation mask manufacturing process and the evaporation process.

Description

Pixel structure and OLED display panel

The present invention relates to the field of display technologies, and in particular, to a pixel structure and an OLED display panel including the pixel structure.

An OLED (Organic Light-Emitting Diode) is an active light-emitting element. Compared with the conventional LCD (Liquid Crystal Display) display mode, the OLED display technology does not require a backlight and has self-luminous characteristics. The OLED uses a thinner organic material film layer and a glass substrate, and when an electric current passes, the organic material film layer emits light. Therefore, the OLED display panel can significantly save power, can be made lighter and thinner, can withstand a wider range of temperature changes than the LCD display panel, and has a larger viewing angle. The OLED display panel is expected to become the next-generation flat panel display technology after LCD, and is one of the most popular technologies in flat panel display technology.

There are many kinds of colorization methods for OLED screens. The OLED colorization technology that is now mature and has been successfully mass-produced is mainly OLED evaporation technology, which uses conventional RGB Stripe (RGB strip) arrangement for evaporation. The best way to look at the picture is the side-by-side approach. The side-by-side method has three sub-pixels of red, green, and blue (R, G, B) in a pixel (Pixel) range, each sub-pixel is quadrilateral, and each has an independent organic Light-emitting element, which uses FCM (Fine Metal Mask) on the array base by vapor deposition film forming technology The corresponding pixel locations on the board form an organic light emitting element, and the FMM is often referred to simply as a metal mask or a vapor deposited mask. The technology of producing an OLED display panel with a high PPI (Pixel Per Inch, the number of pixels per inch) focuses on the fine and mechanically stable FMM and the arrangement of pixels (sub-pixels).

FIG. 1 is a schematic diagram of a pixel arrangement of an OLED display panel in the prior art. As shown in FIG. 1 , the OLED display panel adopts a pixel juxtaposition manner, and each pixel unit Pixel includes an R sub-pixel region 101 , a G sub-pixel region 103 , and a B sub-pixel region 105 , wherein the R sub-pixel region 101 includes an R-emitting region. The region 102 and the R non-light-emitting region (not labeled), the G sub-pixel region 103 includes a G light-emitting region 104 and a G non-light-emitting region (not labeled), and the B sub-pixel region 105 includes a B light-emitting region 106 and a B non-light-emitting region (not labeled) ). The R, G, and B sub-pixel regions and the light-emitting region areas shown in FIG. 1 are respectively equal, and the R, G, and B sub-pixels are arranged in a line. Specifically, in the light-emitting region of each sub-pixel region, a cathode, an anode, and an electroluminescent layer (also referred to as an organic emission layer) are included, wherein the electroluminescent layer is located between the cathode and the anode for generating a predetermined color Light to achieve display. In preparing the display panel of the prior art, it is generally necessary to utilize a three-time evaporation process to form electroluminescent layers of corresponding colors (red, green or blue) in the light-emitting regions of the corresponding color pixel regions, respectively.

The OLED display panel shown in FIG. 1 is generally vapor-deposited by using the FMM shown in FIG. 2, and the FMM includes a shielding area 107 and a plurality of vapor deposition openings 108, and an occlusion area between two adjacent vapor deposition openings 108 in the same column. Call it bridge. In order to avoid the shadowing effect on the sub-pixels during evaporation, a sufficient distance must be maintained between the sub-pixels and the bridge, which causes the lengths of the sub-pixels to decrease, and affects the aperture ratio of each sub-pixel. The traditional RGB collocated pixel arrangement can only reach 200~300PPI, which is difficult to achieve high resolution display. With the user The demand for resolution of OLED display panels is increasing, and the RGB pixel juxtaposition method cannot meet the design requirements of high PPI.

FIG. 3 is a schematic diagram of a pixel arrangement of another OLED display panel in the prior art. As shown in FIG. 3, only G sub-pixels are used exclusively for each pixel unit, and R and B sub-pixels are shared by adjacent pixel units. For example, pixel unit 201 and pixel unit 202 share R sub-pixels. In this way, the PPI of the display screen can be improved. However, in this arrangement, the R and B sub-pixels are shared by adjacent pixel units, and the entire display effect may be distorted, which is not a true color display in the true sense.

The main purpose of this creation is to propose a pixel structure and an OLED display panel, which aim to solve the problems existing in the prior art.

To achieve the above object, a first aspect of the present creative embodiment provides a pixel structure, the pixel structure including a plurality of pixel unit groups, each pixel unit group including adjacent in a first direction and in the first direction a first pixel unit and a second pixel unit that are offset in a vertical second direction,

The first pixel unit and the second pixel unit respectively include three different color sub-pixels disposed along the second direction, respectively belonging to the same color of the first pixel unit and the second pixel unit The distance of the two sub-pixels in the first direction is equal to the distance in the second direction.

Optionally, a first sub-pixel of the second pixel unit is along a center line extending along the first direction and a first sub-pixel and a second sub-pixel of the first pixel unit The boundary lines are coincident, or a center line extending along the first direction of the first sub-pixel in the first pixel unit and a first sub-pixel and a second sub-pixel in the second pixel unit The boundary lines coincide.

Optionally, the first pixel unit includes a first sub-pixel, a second sub-pixel, and a third sub-pixel sequentially arranged along the second direction, and the second pixel unit includes sequentially arranged along the second direction The third sub-pixel, the first sub-pixel, and the second sub-pixel.

Optionally, the aspect ratio of each of the sub-pixels ranges from 1 to 1.5.

Optionally, in the second direction, the distances between the centers of the adjacent two sub-pixels are equal to each other.

Optionally, the shape and area of the sub-pixels of the same color in the first pixel unit and the second pixel unit are the same.

Optionally, the sub-pixel is composed of a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

Optionally, each sub-pixel in the pixel unit group has the same shape and area.

Optionally, in the pixel unit group, the area of the red sub-pixel is the same as the area of the green sub-pixel, and the area of the blue sub-pixel is larger than the area of the red sub-pixel.

Optionally, the first direction is a row direction, the second direction is a column direction, or the first direction is a column direction, and the second direction is a row direction.

In addition, in order to achieve the above object, a second aspect of the present invention provides an OLED display panel, which includes any of the pixel structures described in the first aspect.

The pixel structure and the OLED display panel provided by the embodiments of the present invention can realize full-color display in a true sense by the following features, and the arrangement is compact and reduced. The pixel pitch is reduced, and the PPI is improved: the first pixel unit and the second pixel unit which are adjacently disposed in the first direction and respectively include three sub-pixels of different colors, and the sub-pixels arranged in the second direction are sequentially arranged, a center line extending along the first direction of the third sub-pixel in the second pixel unit coincides with a boundary line between the first sub-pixel and the second sub-pixel in the first pixel unit, respectively belonging to the first pixel unit and the second pixel The distance between the two sub-pixels of the same color of the unit in the first direction is equal to the distance in the second direction; by sharing the adjacent sub-pixels, one pixel unit can exhibit the display effect of two pixels, thereby improving The screen displays resolution and yield, reducing the difficulty of the evaporation mask fabrication process and evaporation process.

101‧‧‧R sub-pixel area

102‧‧‧R illumination zone

103‧‧‧G sub-pixel area

104‧‧‧G light-emitting area

105‧‧‧B sub-pixel area

106‧‧‧B light-emitting area

107‧‧‧ occlusion area

108‧‧‧ evaporation opening

201‧‧‧ pixel unit

202‧‧‧pixel unit

30‧‧‧first pixel unit

31‧‧‧Second pixel unit

301‧‧‧First subpixel

302‧‧‧Red (R) illuminating area

303‧‧‧ second subpixel

304‧‧‧Green (G) illuminating area

305‧‧‧ third sub-pixel

306‧‧‧Blue (B) illuminating area

311‧‧‧ third sub-pixel

312‧‧‧Blue (B) illuminating area

313‧‧‧First subpixel

314‧‧‧Red (R) illuminating area

315‧‧‧ second subpixel

316‧‧‧Green (G) illuminating area

Distance in the direction of x‧‧‧

Distance in the direction of y‧‧‧

d‧‧‧Open length

Z‧‧‧ opening width

B‧‧‧bridge (bridge) value

B1‧‧‧bridge (bridge) value

A‧‧‧ center line

1 is a schematic diagram of a pixel arrangement of an OLED display panel in the prior art; FIG. 2 is a schematic diagram of an FMM corresponding to FIG. 1; FIG. 3 is a schematic diagram of a pixel arrangement of another OLED display panel in the prior art; FIG. 5 is a schematic structural diagram of a pixel unit group in a pixel structure according to an embodiment of the present invention; FIG. 6 and FIG. 7 are diagrams showing a pixel unit group having different pixel opening aspect ratios in a pixel structure according to an embodiment of the present invention; FIG. 8 is a schematic diagram showing the display of a pixel structure according to an embodiment of the present invention; FIG. 9a and FIG. 9b are schematic diagrams showing another pixel structure of the present embodiment.

The present creation will be described in more detail below with reference to the accompanying drawings. Throughout the drawings, the same elements are denoted by like reference numerals. For the sake of clarity, the figures The various parts in the section are not drawn to scale. Moreover, some of the conventional portions may not be shown in the figures.

[First Embodiment]

The present embodiment will be described below with reference to FIG. 4 to FIG. 6 , wherein the first direction is the X direction (which may also be referred to as the row direction or the lateral direction), and the second direction is the Y direction (which may be referred to as the column direction or the longitudinal direction). The first direction is perpendicular to the second direction. For the sake of simplicity, only a part of the pixel structure is shown in the drawing. The number of pixel units in the actual product is not limited thereto, and the number of pixel units may be changed according to the actual display needs. The first row, the second row, the first column, the second column, and the like in the present creation are reference standards shown in the drawings for the purpose of explaining the creation, and do not refer to rows and columns in the actual product.

It should be noted that the first direction and the second direction in this embodiment may not be perpendicular. For convenience of description, the following description will be made in the case where the first direction and the second direction are perpendicular.

As shown in FIG. 4 and FIG. 5, the pixel structure provided by the first embodiment of the present invention includes a plurality of pixel unit groups, each of the pixel unit groups including adjacent ones in the first direction and offset in the second direction and respectively containing three The first pixel unit 30 and the second pixel unit 31 of the sub-pixels of different colors. a first sub-pixel of the second pixel unit 31 (the sub-pixel located at the uppermost position) and a center line extending along the first direction and a first sub-pixel of the first pixel unit 30 The boundary line between the second sub-pixel (the sub-pixel located at the middle position) coincides; Referring to FIG. 9a and FIG. 9b, in another embodiment, a first sub-pixel of the first pixel unit 30 extends along a center line extending in a first direction and the second pixel unit 31 Between the first sub-pixel and the second sub-pixel The boundary lines coincide.

The first pixel unit 30 includes a first sub-pixel 301, a second sub-pixel 303, and a third sub-pixel 305 that are sequentially arranged in a second direction; the second pixel unit 31 includes a third row that is sequentially arranged in the second direction. The sub-pixel 311, the first sub-pixel 313, and the second sub-pixel 315.

It should be noted that, in the present embodiment, the sub-pixel arrangement structure in the first pixel unit 30 and the second pixel unit 31 is not limited to the case of FIGS. 4 to 8. The sub-pixel arrangement may include various combinations of permutations, for example, Figures 9a, 9b are a different case from Figure 4. For convenience of description, the sub-pixel array structure of FIGS. 4 to 8 will be described below.

In this embodiment, the shape of each sub-pixel may be a rectangle or a rectangle, which is not limited in this embodiment.

In this embodiment, the first sub-pixel, the second sub-pixel, and the third sub-pixel in the first pixel unit 30 or the second pixel unit 31 are composed of a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) Sub-pixel configuration. That is, in the present embodiment, the first sub-pixel is one of a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel, and the second sub-pixel is a red (R) sub-pixel, One of a green (G) sub-pixel and a blue (B) sub-pixel, the third sub-pixel being one of a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel, and The colors of one sub-pixel, the second sub-pixel, and the third sub-pixel are different from each other.

Taking FIG. 5 as an example, the first sub-pixel 301 in the first pixel unit 30 is a red (R) sub-pixel, the second sub-pixel 303 is a green (G) sub-pixel, and the third sub-pixel 305 is blue (B). a sub-pixel; therefore, the first sub-pixel 301 includes a red (R) light-emitting region 302 and a red (R) non-light-emitting region (not labeled in the drawing), and includes an organic emission layer for emitting red light; the second sub-pixel 303 Includes green (G) illuminating area 304 and green (G) a non-light-emitting region (not labeled in the drawing), and includes an organic emission layer for emitting green light; the third sub-pixel 305 includes a blue (B) light-emitting region 306 and a blue (B) non-light-emitting region (not labeled in the figure) And includes an organic emission layer for emitting blue light. The first sub-pixel 313 in the second pixel unit 31 is a red (R) sub-pixel, the second sub-pixel 315 is a green (G) sub-pixel, and the third sub-pixel 311 is a blue (B) sub-pixel; therefore, the first A sub-pixel 313 includes a red (R) light-emitting region 314 and a red (R) non-light-emitting region (not labeled in the drawing), and includes an organic emission layer for emitting red light; the second sub-pixel 315 includes green (G) light emission. a region 316 and a green (G) non-light-emitting region (not labeled in the drawing), and includes an organic emission layer for emitting green light; the third sub-pixel 311 includes a blue (B) light-emitting region 312 and a blue (B) non- A light-emitting region (not labeled in the drawing) and including an organic emission layer for emitting blue light.

a center line (shown by A in FIGS. 4 and 5) of the third sub-pixel 311 in the second pixel unit 31 along the first direction and the first sub-pixel 301 and the first pixel unit 30 The boundary lines between the two sub-pixels 303 coincide; It should be noted that, since the first sub-pixel 301 and the second sub-pixel 302 in the first pixel unit 30 share one edge, the common edge is the boundary line between the first sub-pixel 301 and the second sub-pixel 302. However, it should be understood that the "boundary" or "boundary line" herein is not limited to the "boundary" or "boundary line" of the entity, but may refer to the virtual "boundary" or "boundary" between two pixel sub-pixels. line".

The distances of the two sub-pixels of the same color belonging to the first pixel unit 30 and the second pixel unit 31, respectively, in the first direction are equal to the distances in the second direction. That is, the distance between the two sub-pixels of the same color in the pixel unit group in the first direction and the distance in the second direction are equal.

Taking FIG. 6 as an example, the R sub-pixel of the first column and the R sub-image of the second column The distance in the row direction is x, the distance in the column direction is y, and x is equal to y; the distance between the G sub-pixel of the first column and the G sub-pixel of the second column in the row direction is x, in the column direction The upper distance is y, and x is equal to y; the B sub-pixel is similar to the above (not shown in the drawing), and will not be described herein. Through such a pixel arrangement, the pixel unit can be arranged more compactly, the pixel pitch is reduced, and the PPI is improved.

Each pixel unit of the embodiment is composed of RGB three-color sub-pixels, which can realize full-color display in a true sense; on the other hand, it can be simultaneously applied to display panels having the same or different resolution in the first direction and the second direction. In the method that the adjacent pixel units share the sub-pixels, one pixel unit can display the display effect of the two pixels, thereby improving the virtual display resolution of the screen. Taking the original resolution n as an example, the pixel arrangement is shared by the first direction, and the resolution can be doubled to 2n. For the common mode, the dotted triangle in FIG. 4 can be referred to. For example, in FIG. 4, the R sub-pixel and the G sub-pixel of the third column are shared by the B sub-pixels of the second column and the fourth column adjacent thereto, and the B sub-pixel of the third column is second adjacent thereto The column and the fourth column of R sub-pixels are shared with the G sub-pixels.

In one embodiment, the respective aperture aspect ratios of the two sub-pixels of the same color belonging to the first pixel unit 30 and the second pixel unit 31 respectively range from 1 to 1.5.

Referring to FIG. 6 and FIG. 7 , the aspect ratio of the opening of the R sub-pixel is d:z, where d:z ranges from 1 to 1.5, and the G sub-pixel and the B sub-pixel are similar, and are not described herein. When the aspect ratio of the sub-pixel is 1.5, the design margin can be satisfied, and the bridge between the sub-pixels of the same color can be adjusted by adjusting the aspect ratio (such as b and graph in FIG. 6). 7) (b1), increasing the value of the bridge can improve the mechanical stability, reduce the precision metal mask manufacturing process and evaporation The difficulty of the process, improve the production yield. Taking FIG. 6 and FIG. 7 as an example, the value b1 of the bridge in FIG. 7 is greater than the value b of the bridge in FIG. 6, so that the mechanical stability of FIG. 7 is higher than that of FIG. The precision metal mask manufacturing process and the evaporation process are less difficult and the production yield is higher.

In one embodiment, the distance between the centers of two adjacent sub-pixels in the second direction is equal. This embodiment allows the pixel units to be further compactly arranged, reducing pixel pitch and increasing PPI.

In one embodiment, the sub-pixels of the same color that belong to the first pixel unit 30 and the second pixel unit 31 respectively have the same shape and area. The shape and area of the sub-pixels of the same color are the same, which can further reduce the difficulty of the metal mask manufacturing process and the evaporation process. Further, the shape and area of each sub-pixel in the pixel unit group may also remain the same.

Since the luminous efficiency of the B sub-pixel is generally the lowest, in another embodiment, the area of the red sub-pixel and the area of the green sub-pixel may be the same, and the area of the blue sub-pixel may be larger than the red sub-pixel. The area of the pixel.

[Second embodiment]

The second embodiment of the present invention provides an OLED display panel, and the OLED display panel includes the pixel structure described in the first embodiment.

The pixel structure can refer to the first embodiment, and details are not described herein.

In order to further illustrate the embodiment, the display scheme of the pixel structure in the OLED display panel will be described below with reference to FIG. 8. As shown in FIG. 8, in the row direction, the aspect ratio of the real pixel may be 2:1, and each column of sub-pixels Corresponding to display a column of pixels, the following two can be taken when driving the display The first type of driving display mode is such that the portion of the sub-pixel corresponding to the image RGB located in the dotted frame is not displayed; the second driving display mode is such that the sub-pixel corresponding to the image RGB is located in the dotted frame The portion is subjected to a small scale (for example, 30%) brightness display, so that a portion of the sub-pixels corresponding to the image RGB that is not located in the dotted line frame is displayed in a large proportion (for example, 70%), thereby ensuring lateral proximity. The difference in brightness of the column can also make the display of the single point less than distortion. Of course, the brightness display ratio can also be half-divided (that is, the portion of the sub-pixel located in the dotted line frame is displayed with 50% brightness, not within the dotted line frame. The part also performs 50% brightness display), so that the brightness of the adjacent two columns is the same, which will blur the display details and can be applied to the high PPI display.

The implementations of the present invention, as described above, are not intended to be exhaustive or to limit the details. Obviously, many modifications and variations are possible in light of the above description. The present specification selects and describes the embodiments in detail to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and modify the use based on the present invention. . This creation is only subject to the full and equal scope of the scope of the patent application.

Claims (10)

A pixel structure, wherein the pixel structure includes a plurality of pixel unit groups, each pixel unit group including a first pixel that is adjacent in a first direction and is misaligned in a second direction that is perpendicular to the first direction a unit and a second pixel unit, the first pixel unit and the second pixel unit respectively including three different color sub-pixels disposed along the second direction, respectively belonging to the first pixel unit and the first The distance of the two sub-pixels of the same color of the two pixel unit in the first direction is equal to the distance in the second direction. The pixel structure of claim 1, wherein a first sub-pixel of the second pixel unit extends along a center line extending in the first direction and a first sub-pixel and a first pixel in the first pixel unit a boundary line between the two sub-pixels, or a center line extending along the first direction of the first sub-pixel in the first pixel unit and a first sub-pixel of the second pixel unit The boundary lines between the second sub-pixels coincide. The pixel structure of claim 1, wherein the first pixel unit comprises a first sub-pixel, a second sub-pixel, and a third sub-pixel sequentially arranged along the second direction, the second pixel unit including The third sub-pixel, the first sub-pixel, and the second sub-pixel are arranged in the second direction, and the aspect ratio of each of the sub-pixels ranges from 1 to 1.5. The pixel structure of claim 1, wherein, in the second direction, distances between centers of adjacent two sub-pixels are equal to each other. The pixel structure of claim 1, wherein the shape and area of the sub-pixels of the same color in the first pixel unit and the second pixel unit are the same. The pixel structure of any one of claims 1 to 5, wherein the sub-pixel is red The color sub-pixel, the green sub-pixel, and the blue sub-pixel are formed. The pixel structure of claim 6, wherein each of the sub-pixels in the pixel unit group has the same shape and area. The pixel structure of claim 6, wherein in the pixel unit group, the area of the red sub-pixel is the same as the area of the green sub-pixel, and the area of the blue sub-pixel is larger than the area of the red sub-pixel. The pixel structure of any one of claims 1 to 5, wherein the first direction is a row direction, the second direction is a column direction, or the first direction is a column direction, and the second direction is Direction of the line. An OLED display panel, wherein the OLED display panel includes the pixel structure of any one of claims 1 to 9.