OLED display panel and display device

Abstract

The utility model provides an OLED (Organic Light Emitting Diode) display panel and a display device. The OLED display panel comprises a driving circuit layer; the pixel definition layer is positioned on the driving circuit layer; the pixel definition layer comprises a pixel array and a liquid crystal box filled between adjacent pixels. No voltage is applied to the two ends of the liquid crystal box or the same voltage is applied to the two ends of the liquid crystal box, so that the voltage difference between the two ends of the liquid crystal box is zero or smaller than a preset value, and liquid crystal molecules do not deflect. In a screen turn-off state or a turn-on mode, the liquid crystal box is controlled not to deflect through the driving circuit layer, so that the light transmittance of the OLED display screen is improved or the reflectivity of the screen to external light is reduced. Compared with the prior art in which a black material and a liquid crystal box are used as molded products, the OLED display panel has the advantages that higher acquisition cost is not needed, equipment is not polluted, the manufacturing cost of the OLED display panel is reduced, and the problem of reflected light of a screen can be solved with lower cost.

Description

Technical Field

[0001] The utility model relates to the field of display technology, in particular to an OLED display panel and a display device. Background Art

[0002] With the continuous development of science and technology, various display screens have been widely used in people's lives and work, bringing great convenience to people's daily lives. Among them, organic light-emitting diode (OLED)-based organic light-emitting display panels have many advantages such as low energy consumption, high resolution, high brightness, high luminous efficiency, fast response speed, wide viewing angle, no need for backlight, low cost and low driving voltage, which greatly meets people's various needs for display devices and has broad research and application prospects in the fields of display and light source.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0004] In view of the problems in the prior art, the purpose of the present invention is to provide an OLED display panel and a display device, which overcome the technical problem of high cost of OLED display panels in the related art.

[0005] The present disclosure provides an OLED display panel, which includes:

[0006] Driving circuit layer;

[0007] A pixel definition layer located on the driving circuit layer;

[0008] The pixel definition layer includes: a pixel array and a liquid crystal box filled between adjacent pixels.

[0009] In some embodiments, the OLED display panel further comprises:

[0010] A substrate disposed below the driving circuit layer;

[0011] A packaging cover plate is arranged above the pixel definition layer.

[0012] In some embodiments, the OLED display panel further includes: a polarizer disposed on the upper surface of the packaging cover plate.

[0013] In some embodiments, the OLED display panel further comprises:

[0014] An upper substrate, a lower substrate and a color filter layer;

[0015] The driving circuit layer and the pixel definition layer are located between the upper substrate and the lower substrate, and the color filter layer is located between the pixel definition layer and the upper substrate.

[0016] In some embodiments, an encapsulation layer is disposed between the pixel definition layer and the color filter layer.

[0017] In some embodiments, the driving circuit layer includes a driving transistor.

[0018] In some embodiments, the driving transistor is a thin film transistor.

[0019] The embodiments of the present disclosure further provide an OLED display device, which includes the OLED display panel of any of the above embodiments.

[0020] The OLED display panel and display device of the present invention have the following advantages:

[0021] The OLED display panel includes: a driving circuit layer; a pixel definition layer located on the driving circuit layer; the pixel definition layer includes: a pixel array and a liquid crystal box filled between adjacent pixels. By not applying voltage or applying the same voltage to both ends of the liquid crystal box, the voltage difference between the two ends of the liquid crystal box is zero or less than a preset value, and the liquid crystal molecules do not deflect.

[0022] In the lighting mode, the liquid crystal molecules do not deflect, so that the external light cannot pass through this liquid crystal box and meet the adjacent pixel array for reflection. Therefore, it can block the interference of external light on the screen display to solve the problem of reflected light entering the eyes and improve the user experience. In the screen-off mode, the liquid crystal molecules do not deflect, which can increase the transmittance of external light, improve the integrated black effect of the screen, and improve the user experience. Compared with the use of black materials in related technologies, the liquid crystal box is a molded product, which does not require a high collection cost and will not pollute the equipment, reducing the production cost of OLED display panels and can solve the problem of screen reflection light at a relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0024] Figure 1 A schematic diagram showing the structure of an OLED display device provided by an embodiment of the present disclosure;

[0025] Figure 2 A schematic diagram showing the structure of an OLED display device provided by another embodiment of the present disclosure;

[0026] 11, 24, driving circuit layer; 12, 25, pixel definition layer; 120, pixel array; 121, liquid crystal box; 21, upper substrate; 22, lower substrate; 23, color filter layer; 26, encapsulation layer. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0033] It should be understood that when a component is referred to as being “on another component,” “connected to another component,” “coupled to another component,” or “contacting another component,” it can be directly on, connected to, coupled to, or contacting the other component, or intervening components may be present. In contrast, when a component is referred to as being “directly on another component,” “directly connected to,” “directly coupled to,” or “directly contacting” another component, there are no intervening components present.

[0034] In addition, the accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.

[0035] In the related art, the organic light emitting display panel has the following situations during use:

[0036] On the one hand, during the use of the screen, the screen generates reflected light, which is easy to directly shine into the human eye, affecting people's experience of using it. In a related technology, the use of polarizers can solve this problem, but it brings the problem of increased power consumption.

[0037] On the other hand, when the screen is off, it affects the solid black effect of the screen.

[0038] Therefore, the direct cause of these situations is the high reflectivity of the organic light-emitting display panel, which is also one of the problems that technicians in the display field need to solve.

[0039] Through research on relevant technologies and products, it was found that the causes of the above problems include that the anode and cathode of OLED, especially the cathode, use metal materials with extremely high reflectivity, and some OLEDs use flat layers and pixel definition layers PDL (Pixel Defining Layer) with high transmittance, which results in a large amount of reflected light on the organic light-emitting display panel when exposed to external light.

[0040] In a related technology, the pixel definition layer uses black organic materials instead of traditional transparent materials to reduce the overall reflectivity of the device. However, the selection of black organic materials has become another difficult problem in the industry. On the one hand, it is necessary to select PDL black materials with a certain optical density, and the conditions of processes such as exposure, development and baking need to be optimized; on the other hand, it pollutes the equipment. In the mass production process, once this dark material occupies the machine, it is not easy to thoroughly clean and replace other materials. A machine can even only be used for this specific black material, which greatly increases the production cost.

[0041] Based on the above research results, the embodiments of the present disclosure propose an improved OLED display panel and display device to solve the problem of reflected light at a low cost.

[0042] like Figure 1 As shown, the embodiment of the present disclosure provides an OLED display panel, which includes:

[0043] Driving circuit layer 11;

[0044] A pixel definition layer 12 located on the driving circuit layer 11;

[0045] The pixel definition layer 12 includes a pixel array 120 and a liquid crystal cell 121 filled between adjacent pixels.

[0046] In this embodiment, the liquid crystal box 121 is composed of a liquid crystal layer injected between two glass plates with transparent electrodes evaporated, and the contact surface between the glass substrate and the liquid crystal layer is surface treated to align the liquid crystal molecules in a certain direction.

[0047] The driving circuit layer 11 is used to drive the pixels to emit light and to control the deflection of the liquid crystal box 121. Specifically, by not applying voltage or applying the same voltage to both ends of the liquid crystal box 121, the voltage difference between the two ends of the liquid crystal box 121 is zero or less than a preset value, and the liquid crystal molecules do not deflect.

[0048] In the lighting mode, the liquid crystal molecules are not deflected, so that external light cannot pass through this liquid crystal box 121 and meet the adjacent pixel array 120 for reflection. Therefore, it can block the interference of external light on the screen display to solve the problem of reflected light entering the eyes and improve the user experience.

[0049] In the screen-off mode, the liquid crystal molecules do not deflect, which can increase the transmittance of external light, enhance the screen's integrated black effect, and improve the user experience.

[0050] In this way, in the screen-off state or the lighting mode, the liquid crystal box 121 is controlled by the driving circuit layer 11 not to deflect, thereby increasing the light transmittance of the OLED display screen or reducing the reflectivity of the screen to external light.

[0051] Compared with the use of black materials in related technologies, the liquid crystal box is a molded product, which does not require high collection costs and will not pollute the equipment. It reduces the production cost of OLED display panels and can solve the problem of screen reflection light at a relatively low cost.

[0052] In this embodiment, the pixel definition layer 12 is used to define each pixel so that the OLED colors do not interfere with each other. The pixel array 120 includes pixels of three colors: red (R), green (G), and blue (B), and each pixel may include an anode, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, and a cathode.

[0053] The light-emitting principle of the OLED display panel is as follows: under the action of the electric field applied by the driving circuit layer 11, electrons and holes migrate from the cathode and anode to the light-emitting layer respectively. After the electrons and holes meet in the light-emitting layer, they recombine to form excitons, which excite the light-emitting molecules in the main light-emitting material, and the latter emit visible light after radiation.

[0054] During the manufacturing process, the liquid crystal cells 121 are first arranged on the driving circuit layer 11, and the pixel array 120 is filled in the gaps between the liquid crystal cells 121, and finally the pixel definition layer 12 is formed. The relative position relationship between the liquid crystal cells 121 and the pixel array 120 can be set as required.

[0055] In the embodiment of the present disclosure, the driving circuit layer 11 includes a driving transistor, and the driving transistor may be a thin-film transistor (TFT).

[0056] like Figure 1 As shown, the OLED display panel of the embodiment of the present disclosure is applied to a hard screen, that is, the pixel array 120 is a fish scale shape with full pixels, facing left, commonly known as a "human" shape. In this way, the OLED display panel also includes:

[0057] A substrate 10 disposed below the driving circuit layer 11;

[0058] The packaging cover plate 20 is disposed above the pixel definition layer 12 .

[0059] In an optional implementation, a polarizer (not shown in the figure) may be further provided on the upper surface of the packaging cover plate 20 , and the polarizer is used to eliminate surface reflection.

[0060] In another embodiment of the present disclosure, Figure 2 As shown, the OLED display panel of the embodiment of the present disclosure can also be applied to a flexible screen. In this case, the OLED display panel can also include: an upper substrate 21, a lower substrate 22 and a color filter layer 23;

[0061] The driving circuit layer 24 and the pixel definition layer 25 are located between the upper substrate 21 and the lower substrate 22 , and the color filter layer 23 is located between the pixel definition layer 25 and the upper substrate 21 .

[0062] In this embodiment, the color filter layer 23 may include three filter units of RGB. When the color filter layer 23 is used in the flexible screen, it can replace the polarizer.

[0063] In an optional implementation, an encapsulation layer 26 is disposed between the pixel definition layer 25 and the color filter layer 23 , and the color filter layer 23 is formed on an upper surface of the encapsulation layer 26 .

[0064] The present disclosure also provides an OLED display device, which includes Figure 1 or Figure 2 OLED display panel shown.

[0065] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An OLED display panel, characterized in that: include: Driving circuit layer; A pixel definition layer located on the driving circuit layer; The pixel definition layer includes: a pixel array and a liquid crystal box filled between adjacent pixels.

2. The OLED display panel according to claim 1, characterized in that: The OLED display panel further includes: A substrate disposed below the driving circuit layer; A packaging cover plate is arranged above the pixel definition layer.

3. The OLED display panel according to claim 2, characterized in that: The OLED display panel further includes a polarizer disposed on the upper surface of the packaging cover plate.

4. The OLED display panel according to claim 1, characterized in that: The OLED display panel further includes: An upper substrate, a lower substrate and a color filter layer; The driving circuit layer and the pixel definition layer are located between the upper substrate and the lower substrate, and the color filter layer is located between the pixel definition layer and the upper substrate.

5. The OLED display panel according to claim 4, characterized in that: An encapsulation layer is disposed between the pixel definition layer and the color filter layer.

6. The OLED display panel according to claim 1, characterized in that: The driving circuit layer includes a driving transistor.

7. The OLED display panel according to claim 6, characterized in that: The driving transistor is a thin film transistor.

8. An OLED display device, characterized in that: Comprising the OLED display panel as described in any one of claims 1 to 7.

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