CN215815880U - Display panel and display device - Google Patents

Abstract

The utility model provides a display panel and a display device, wherein the display panel comprises a substrate base plate, an organic light-emitting layer, an electric control shading device and a color film layer, wherein the organic light-emitting layer, the electric control shading device and the color film layer are arranged on the substrate base plate in a laminated mode; the electronic control shading device is configured to be in a light transmitting state when the organic light emitting layer emits light and be in a light non-transmitting state when the organic light emitting layer does not emit light, and when the bright screen of the display panel works, the electronic control shading device displays transparently and does not affect the light emission of the organic light emitting layer of the display panel and the light filtering of the color film layer; when the display panel does not work and screen-off, the electric control shading device displays black or other dark colors and is used for absorbing external irradiation light and preventing the external irradiation light from reaching the metal electrode, so that the problems of dark state reflectivity and color separation are obviously improved.

Description

Display panel and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

At present, the Organic Light Emitting Diode (OLED) display technology is mature day by day and has been widely used in the display fields of mobile phones, televisions and the like. The OLED display panel is usually attached to a polarizer through a module to reduce the ambient light reflectivity, thereby achieving a "black-in-one" effect in the information screen state. In order to pursue better folding performance, higher Color gamut and reduce power consumption of the display screen, a Color filter on Encapsulation (Color filter on Encapsulation) structure is developed, in which a Color filter film and a black matrix are directly formed on a thin film Encapsulation layer. COE has higher transmittance compared with a polaroid, and can reduce the power consumption of an OLED device so as to prolong the service life of a product.

However, when the display panel is turned on, since the transmittance of the COE structure is higher than that of the polarizer structure, the reflection of the metal electrode is enhanced when the external light irradiates the display, which results in a high dark-state reflectance of the display with the COE structure and a severe color separation phenomenon.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present disclosure provides a display panel and a display device.

In view of the above object, the present disclosure provides a display panel including:

the light-emitting device comprises a substrate base plate, an organic light-emitting layer, an electric control shading device and a color film layer, wherein the organic light-emitting layer, the electric control shading device and the color film layer are arranged on the substrate base plate in a laminated mode; wherein the electrically controlled light blocking device is configured to be in a light transmitting state when the organic light emitting layer emits light and in a light non-transmitting state when the organic light emitting layer does not emit light.

As can be seen from the above, the display panel provided by the present disclosure includes a substrate, and an organic light emitting layer, an electrically controlled light blocking device, and a color film layer stacked on the substrate; the electronic control shading device is configured to be in a light transmitting state when the organic light emitting layer emits light and be in a light non-transmitting state when the organic light emitting layer does not emit light, and when the bright screen of the display panel works, the electronic control shading device displays transparently and does not affect the light emission of the organic light emitting layer of the display panel and the light filtering of the color film layer; when the display panel does not work and screen-off, the electric control shading device displays black or other dark colors and is used for absorbing external irradiation light and preventing the external irradiation light from reaching the metal electrode, so that the problems of dark state reflectivity and color separation are obviously improved.

Drawings

In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural cross-sectional view of a display panel in the related art of the disclosure;

fig. 2 is a schematic structural cross-sectional view of a display panel according to an embodiment of the disclosure;

FIG. 3 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present disclosure;

fig. 4 is a schematic structural cross-sectional view of an electrically controlled shading device according to an embodiment of the present disclosure;

fig. 5 is a partial bright top view of a structure of an electrically controlled light blocking device according to an embodiment of the disclosure;

fig. 6 is a partial dark state top view of a structure of an electrically controlled shading device according to an embodiment of the present disclosure;

FIG. 7 is a schematic cross-sectional view illustrating a structure of another display panel according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of an external electrode of another display panel according to an embodiment of the disclosure.

Description of reference numerals:

the pixel structure comprises a substrate 1, a substrate 2, a pixel circuit 3, a first electrode layer, an organic light emitting layer 4, a pixel defining layer 41, an organic functional layer 42, a second electrode layer 5, an encapsulation layer 6, a color film layer 7, a color film layer 71, a black matrix 72, an electronic control shading device 8, a first control electrode layer 81, an electrochromic layer 82, an ion conductor layer 83, an ion storage layer 84, a second control electrode layer 85, an external positive electrode 91 and an external negative electrode 92.

Detailed Description

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As described in the background art, although the conventional COE structure can reduce the power consumption of the display panel and enhance the display quality of the OLED panel, as shown in fig. 1, the present invention is a structural schematic diagram of a display panel in the related art, and since the transmittance of the COE structure of the display panel is higher than that of the polarizer structure, the reflection of the metal electrode is enhanced when the external light irradiates the display screen, which results in a high dark-state reflectance of the display screen of the COE structure and a severe color separation phenomenon. Further, the light-emission luminance of the display panel at a large viewing angle is further attenuated due to the light absorption action of the black matrix 72, thereby exacerbating the viewing angle luminance attenuation (L-Decay). In addition, the black matrix 72 affects the color shift and the color symmetry of the display panel at a large viewing angle due to different pixel arrangements. According to the display panel, the electric control shading device is arranged under the color film, the color is changed in a dark state to show black or other dark colors, external light is absorbed and prevented from reaching the metal electrode, the problems of dark-state reflectivity and color separation are obviously improved, the color is changed in a bright state to show transparency, the light emission of an organic light emitting layer of the display panel is not influenced, and the problems of reflectivity and color separation in the dark state are obviously improved. Meanwhile, the display panel of the present disclosure cancels the black matrix 72 in the related art, so that the problems of color cast and large viewing angle brightness attenuation in the bright state of the COE structure can be significantly improved.

Referring to fig. 2, a schematic structural cross-sectional view of a display panel according to an embodiment of the present disclosure, the display panel includes:

the light-emitting device comprises a substrate base plate 1, an organic light-emitting layer 4, an electric control shading device 8 and a color film layer 7, wherein the organic light-emitting layer, the electric control shading device 8 and the color film layer are arranged on the substrate base plate in a laminated mode; wherein the electrically controlled light blocking device is configured to be in a light transmitting state when the organic light emitting layer emits light and in a light non-transmitting state when the organic light emitting layer does not emit light.

Specifically, the substrate 1 of the present disclosure may be a glass substrate or a silicon substrate, and is not limited herein. Compared with a display panel structure in the related technology, the display panel designed by the present disclosure has the advantages that the electric control shading device 8 is additionally arranged between the color film layer 7 and the organic light emitting layer 4, when voltage is applied to two ends of the electric control shading device 8, the transparent state is displayed, and when no voltage is applied, the black or dark state is displayed, the opaque state is selected, the voltage at two ends of the electric control shading device 8 and the voltage of the organic light emitting layer 4 can be synchronously arranged, namely when the organic light emitting layer 4 emits light, two ends of the electric control shading device 8 are electrified, and when the organic light emitting layer 4 does not emit light, two ends of the electric control shading device 8 are powered off. Optionally, black or dark color may be displayed when a forward voltage is applied to the electrically controlled light-shielding device 8, and transparent display is displayed when a reverse voltage is applied, and it is realized by a simple circuit arrangement that a forward voltage is applied to the electrically controlled light-shielding device 8 when the organic light-emitting layer 4 emits light, and a reverse voltage is applied to the electrically controlled light-shielding device 8 when the organic light-emitting layer 4 does not emit light, referring to fig. 5, when the display panel emits light during operation, the electrically controlled light-shielding device 8 is transparent, and normal light emission of light through the color film layer 7 is not affected. Referring to fig. 6, when the display panel is in a dark state, the electrically controlled light-shielding device 8 is black or dark, and can absorb external light to prevent the external light from reaching the metal electrode.

In some embodiments, as shown in fig. 3, the electrically controlled light blocking device 8 includes a first control electrode layer 81, an electrochromic layer 82, and a second control electrode layer 85, which are sequentially stacked; the first control electrode layer 81 and the second control electrode layer 85 are configured to apply a voltage to the electrochromic layer 82 to control the electrochromic layer 82 to be in a light-transmitting state or a light-non-transmitting state.

Specifically, the electrochromic layer 82 is configured to change a color into a transparent color or a dark color according to a voltage change at two ends, and optionally, the first control electrode layer 81 may be configured as a cathode, the second control electrode layer 85 may be configured as an anode, and optionally, the cathode and the anode of the first control electrode layer 81 and the cathode and the anode of the second control electrode layer 85 may be interchanged. Optionally, the first control electrode layer 81 and the second control electrode layer 85 are disposed with a wire to connect with an external voltage, so as to control the electrochromic layer 82 to be in a light-transmitting state or a light-proof state.

Further, referring to fig. 4, the electrically controlled shade device of the present disclosure may further include: in a specific implementation process, the positions of the electrochromic layer 82 and the ion storage layer 84 may be exchanged, or an electrically controlled light blocking device with other structure may be provided. The ion conductor layer 83 is used for providing electrons for the electrochromic layer 82 or the ion storage layer 84, the ion storage layer 84 stores corresponding counter ions when the electrochromic layer changes color and keeps the charge balance of the whole electric control shading device, optionally, the ion storage layer 84 can also be set to be an electrochromic material with the color change performance opposite to that of the electrochromic layer 82, so that the charge can be balanced and the color superposition effect can be achieved, and the color of the shading device can be deepened when the shading device is in the non-transmission state. Such as: the electrochromic layer material is an anodic oxidation electrochromic material, and the ion storage layer can be a cathodic reduction electrochromic material.

In some embodiments, the first control electrode layer 81 may be made of indium tin oxide or other materials, the electrochromic layer 82 may be made of inorganic or organic materials such as tungsten oxide, iridium oxide, or polyaniline, the ion conductor layer 83 may be made of a polymer electrolyte, and the ion storage layer 84 may be made of any material as needed, for example, any material meeting the requirement may be selected only when the charge balance function is performed, and if the color superposition function is performed at the same time, the material of the electrochromic layer 82 needs to be selected by referring to the material, which is not limited herein. The second control electrode layer 85 may be made of indium tin oxide.

In some embodiments, as shown in fig. 3, the organic light emitting layer 4 includes an organic functional layer 42 and a pixel defining layer 41, and the first electrode layer 3 and the pixel circuit 2 are further disposed on the substrate 1.

In some embodiments, as shown in fig. 3, the color film layer 7 includes a plurality of color films 71, and a black matrix structure is not disposed between adjacent color films 71, and is directly adjacent to each other. The display panel further comprises a second electrode layer 5 arranged on the organic light emitting layer 4, and the thickness of the second electrode layer 5 is a preset thickness for narrowing the spectrum emitted by the organic light emitting layer 7.

Specifically, the color film layer 7 includes a plurality of color films 71 with different colors, the color films 71 are directly adjacent to each other, a black matrix structure is eliminated, and the thickness of the second electrode layer 5 is set to a preset thickness to narrow the spectrum emitted by the organic light emitting layer 7. Therefore, the problems of color cast and large-viewing-angle brightness attenuation in the COE structure in a bright state can be obviously improved, the area of the overlapped area of different colors is reduced, and the problem of color crosstalk which may occur is prevented. In the related art, the thickness of the second electrode layer is generally below 10nm, and the present disclosure sets the thickness of the second electrode layer 5 to a preset thickness, and achieves narrowing of the spectrum emitted by the organic light emitting layer by thickening the thickness of the first electrode layer. Alternatively, the preset thickness can be set to be 10-20nm, and the size of the preset thickness can be set by a person skilled in the art according to actual situations. Optionally, the organic light emitting layer 4 includes an organic functional layer 42 and a pixel defining layer 41, and the color film 71 of each color vertically corresponds to each color of the pixel defining layer 41. Optionally, the organic functional layer 42 is disposed on the pixel defining layer 41, and the second electrode layer 5 is disposed on the organic functional layer 42. Optionally, the first electrode layer 3 is disposed on the pixel circuit 2, the second electrode layer 5 is a cathode, and the first electrode layer 3 is an anode.

Watch 1

As shown in table one, after the structure of the display panel in the embodiment of the disclosure eliminates the black matrix, the color shift and the viewing angle luminance attenuation effect are significantly better than those of the display panel with the black matrix in the related art, and the electroluminescence power consumption of the display panel in the embodiment of the disclosure is also smaller than that of the display panel with the black matrix in the related art, which shows that the display panel with the eliminated black matrix in the disclosure is better than the display panel in the related art from the aspects of performance and energy saving. Wherein the unit of the first color shift is JNCD (minimum color shift unit which can be recognized by human eyes).

In some embodiments, as shown in fig. 3, a first electrode layer 3, the organic light emitting layer 4, a second electrode layer 5, an encapsulation layer 6, the first control electrode layer 81, the electrochromic layer 82, the second control electrode layer 82, and the color film layer 7 are sequentially stacked on the base substrate 1;

wherein the first electrode layer 3 and the second electrode layer 5 are configured to control the organic light emitting layer 4 to emit light; the color film layer 7 does not comprise a black matrix; the thickness of the second electrode layer 5 is a predetermined thickness for narrowing the spectrum emitted by the organic light emitting layer. The predetermined thickness may be set to 10-20 nm. Optionally, the first control electrode layer and the second control electrode layer are respectively connected with the first electrode layer and the second electrode layer through wires, so that the electronic control shading device is connected in parallel with the OLED device composed of the organic light emitting layer, the first electrode layer and the second electrode layer, and thus the electronic control shading device can be controlled to be in a light transmitting state and the organic light emitting device can emit light by using the same voltage signal.

In some embodiments, as shown in fig. 7, a first electrode layer 3, the organic light emitting layer 4, the first control electrode layer 81, the electrochromic layer 82, the second control electrode layer 85, an encapsulation layer 6, and the color film layer 7 are sequentially stacked on the base substrate 1;

wherein the first control electrode layer 81 is further configured to cooperate with the first electrode layer 3 to control the organic light emitting layer 4 to emit light; the color film layer 7 does not comprise a black matrix; the thickness of the first control electrode layer is a preset thickness and is used for narrowing a spectrum emitted by the organic light emitting layer.

In some embodiments, as shown in fig. 7, the second control electrode layer 85 is connected to the first electrode layer 3 by a trace.

Specifically, as shown in fig. 7 and fig. 8, the first control electrode layer 81 of the electrically controlled light shielding device 8 is simultaneously used as an electrode of the electrically controlled light shielding device 8 and an OLED device, which is equivalent to the electrically controlled light shielding device 8 and the OLED device sharing one electrode, and the OLED device includes: an organic light emitting layer, a first electrode layer, and a second electrode layer. This allows the thickness of the entire display panel to be reduced and saves material. The second control electrode layer 85 of the electric control shading device 8 is externally connected with the positive electrode 91, and the second control electrode layer 85 is connected with the external positive electrode of the first electrode layer 3 by wiring, so that the electric control shading device 8 is connected with the OLED device in parallel. When the external power supply starts to supply power, the display panel works by emitting light through the OLED device, and because the electric control shading device 8 is connected with the OLED device in parallel, voltages are also generated at two ends of the first control electrode layer 81 and the second control electrode layer 85 of the electric control shading device 8, so that the electric control shading device 8 is transparent, and the OLED device emits light normally; when the external power supply stops supplying power, the OLED device stops working, and the voltage across the first control electrode layer 81 and the second control electrode layer 85 of the electrically controlled light shielding device 8 also disappears, so that the electrically controlled light shielding device 8 displays an opaque color (black or dark color). Since the structure of the color film layer 7 in this embodiment does not include the black matrix, the problems of color shift and large viewing angle brightness attenuation in the bright state of the COE structure can be significantly improved, but at the same time, the areas of overlapping regions of different colors may be increased, so that color crosstalk occurs. Optionally, the predetermined thickness is 10-20 nm.

The present disclosure also provides a display device including the display panel. The display device can be a mobile phone, a television, a tablet computer, a display and other devices with display functions.

The display panel comprises a substrate base plate, an organic light emitting layer, an electric control shading device and a color film layer, wherein the organic light emitting layer, the electric control shading device and the color film layer are arranged on the substrate base plate in a laminated mode; the electronic control shading device is configured to be in a light transmitting state when the organic light emitting layer emits light and be in a light non-transmitting state when the organic light emitting layer does not emit light, and when the bright screen of the display panel works, the electronic control shading device displays transparently and does not affect the light emission of the organic light emitting layer of the display panel and the light filtering of the color film layer; when the display panel does not work and screen-off, the electric control shading device displays black or other dark colors and is used for absorbing external irradiation light and preventing the external irradiation light from reaching the metal electrode, so that the problems of dark state reflectivity and color separation are obviously improved. Meanwhile, the display panel cancels a black matrix (BL), and can remarkably improve the problems of color cast and large-viewing-angle brightness attenuation in a COE structure bright state.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.

Claims (9)

1. A display panel, comprising: the light-emitting device comprises a substrate base plate, an organic light-emitting layer, an electric control shading device and a color film layer, wherein the organic light-emitting layer, the electric control shading device and the color film layer are arranged on the substrate base plate in a laminated mode; wherein the electrically controlled light blocking device is configured to be in a light transmitting state when the organic light emitting layer emits light and in a light non-transmitting state when the organic light emitting layer does not emit light.

2. The display panel according to claim 1, wherein the electrically controlled light blocking device includes a first control electrode layer, an electrochromic layer, and a second control electrode layer which are sequentially stacked; the first control electrode layer and the second control electrode layer are configured to apply a voltage to the electrochromic layer to control the electrochromic layer in a light-transmissive state or a light-opaque state.

3. The display panel according to claim 2, wherein a first electrode layer, the organic light emitting layer, a second electrode layer, an encapsulation layer, the first control electrode layer, the electrochromic layer, the second control electrode layer, and the color film layer are sequentially stacked on the base substrate;

wherein the first electrode layer and the second electrode layer are configured to control the organic light emitting layer to emit light; the color film layer does not comprise a black matrix; the thickness of the second electrode layer is a preset thickness and is used for narrowing the spectrum emitted by the organic light emitting layer.

4. The display panel according to claim 2, wherein a first electrode layer, the organic light emitting layer, the first control electrode layer, the electrochromic layer, the second control electrode layer, an encapsulation layer, and the color film layer are sequentially stacked on the base substrate;

wherein the first control electrode layer is also configured to cooperate with the first electrode layer to control the organic light-emitting layer to emit light; the color film layer does not comprise a black matrix; the thickness of the first control electrode layer is a preset thickness and is used for narrowing a spectrum emitted by the organic light emitting layer.

5. The display panel of claim 4, wherein the second control electrode layer is connected to the first electrode layer by a trace.

6. The display panel according to claim 4 or 5, wherein the predetermined thickness is 10-20 nm.

7. The display panel according to claim 4 or 5, wherein the organic light emitting layer includes a pixel defining layer, and the color film layer corresponds up and down to a color of the pixel defining layer.

8. The display panel according to claim 2, wherein a material of the first control electrode layer and the second control electrode layer is indium tin oxide; the electrochromic layer is made of any one of tungsten oxide, iridium oxide and polyaniline.

9. A display device comprising the display panel according to any one of claims 1 to 8.

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