Display panel and display device

Abstract

The present disclosure provides a display panel and a display device, belonging to the field of display technology, which can solve the problem of red display images in existing wide-viewing angle display panels. The display panel of the present disclosure includes: a substrate, a light-emitting device layer located on the substrate and arranged in sequence along a direction away from the substrate, an encapsulation layer, and a color filter layer; the light-emitting device layer includes: a first light-emitting device and a second light-emitting device; the color filter layer includes: a first color filter unit and a second color filter unit; the first light-emitting device and the first color filter unit are the same color and are arranged correspondingly, and the second light-emitting device and the second color filter unit are the same color and are arranged correspondingly; the display panel also includes: a light-blocking structure; the light-blocking structure is configured to block light from the first light-emitting device to the second color filter unit.

Description

Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a display panel and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) is a light-emitting device that uses organic solid-state semiconductors as light-emitting materials. It has broad application prospects due to its advantages such as simple preparation process, low cost, low power consumption, high luminous brightness, and wide operating temperature adaptability.

[0003] Currently, OLED display panels can use color film (CF) and black matrix (BM) instead of polarizers to filter light. However, the color film unit is easily affected by the light emitted by adjacent light-emitting devices, causing cross-color and affecting the display quality of the OLED display panel. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provide a display panel and a display device.

[0005] In a first aspect, an embodiment of the present disclosure provides a display panel, comprising: a substrate, a light-emitting device layer, an encapsulation layer, and a color filter layer located on the substrate and sequentially arranged in a direction away from the substrate;

[0006] The light-emitting device layer includes: a first light-emitting device and a second light-emitting device; the color filter layer includes: a first color filter unit and a second color filter unit; the first light-emitting device and the first color filter unit have the same color and are arranged correspondingly, and the second light-emitting device and the second color filter unit have the same color and are arranged correspondingly;

[0007] The display panel further includes a light-blocking structure configured to block light from the first light-emitting device to the second color film unit.

[0008] Optionally, the light-emitting device layer further includes: a third light-emitting device; the color filter layer further includes: a third color filter unit; the third light-emitting device and the third color filter unit have the same color and are arranged correspondingly.

[0009] Optionally, the display panel further comprises: a filling layer and a black matrix sequentially arranged on a side of the encapsulation layer away from the substrate; the filling layer is formed with a groove at a position between the first color filter unit and the second color filter unit;

[0010] Part of the black matrix is ​​disposed in the groove of the filling layer to serve as the light blocking structure.

[0011] Optionally, the black matrix has a thickness of 1 micron to 2 microns.

[0012] Optionally, the display panel further comprises: a pixel defining layer located on the substrate; the first light emitting device, the second light emitting device and the third light emitting device are located within an area defined by the pixel defining layer;

[0013] The thickness of the pixel defining layer around the first light emitting device is greater than that around the second and third light emitting devices to serve as the light blocking structure.

[0014] Optionally, the pixel defining layer around the first light emitting device has a thickness of 1.5 microns to 3 microns;

[0015] The pixel defining layer around the second light emitting device and the third light emitting device has a thickness of 0.8 micrometers to 1.0 micrometers.

[0016] Optionally, the thickness of the black matrix between the first color filter unit and the second color filter unit is greater than the thickness of the black matrix between the second color filter unit and the third color filter unit;

[0017] The thickness of the black matrix between the first color filter unit and the second color filter unit is greater than the thickness of the black matrix between the first color filter unit and the third color filter unit.

[0018] Optionally, the orthographic projection of the first light-emitting device on the substrate coincides with the center of the orthographic projection of the first color filter unit on the substrate;

[0019] The orthographic projection of the second light emitting device on the substrate coincides with the center of the orthographic projection of the second color filter unit on the substrate;

[0020] The orthographic projection of the third light emitting device on the substrate coincides with the center of the orthographic projection of the third color filter unit on the substrate.

[0021] Optionally, the first light-emitting device includes a red light-emitting device; the second light-emitting device includes a green light-emitting device; and the third light-emitting device includes a blue light-emitting device.

[0022] In a second aspect, an embodiment of the present disclosure provides a display device, which includes the display panel provided above. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic structural diagram of a display panel in related technology.

[0024] Figure 2 Schematic diagram of the structure of another display panel in the related art.

[0025] Figure 3 It is the light transmittance spectrum of the color film unit.

[0026] Figure 4 A schematic structural diagram of a display panel provided in an embodiment of the present disclosure.

[0027] Figure 5 A schematic structural diagram of another display panel provided in an embodiment of the present disclosure.

[0028] Figure 6 A schematic structural diagram of another display panel provided in an embodiment of the present disclosure.

[0029] Figure 7 A schematic structural diagram of another display panel provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0032] Figure 1 is a schematic diagram of the structure of a display panel in the related art, such as Figure 1As shown, the display panel is provided with a polarizer. When ambient light strikes the cathode of the light-emitting device, the polarizer converts the ambient light into first polarized light deflected in a first direction. The cathode reflects the first polarized light and simultaneously converts the first polarized light into second polarized light deflected in a second direction. The first and second directions are arranged in an intersecting manner. Since the deflection direction of the second polarized light is different from that of the first polarized light, the polarizer can only transmit the first polarized light deflected in the first direction, while the second polarized light cannot be transmitted by the polarizer, thereby preventing the ambient light from affecting the display effect of the display panel.

[0033] Since the presence of polarizer seriously affects the light transmittance of the display surface, in order to improve the light transmittance of the display panel, the color filter unit and black matrix can be used instead of the polarizer to filter the light. The structure is as follows: Figure 2 As shown, the black matrix can absorb ambient light, and the color filter layer can filter the corresponding color light and absorb the light of other colors. At the same time, it can transmit the light emitted by the corresponding light-emitting device without affecting the light transmittance of the light-emitting device, thereby improving the light transmittance of the display panel.

[0034] However, in display panels with wide viewing angles, the display screen is prone to redness. Based on optical analysis, this is caused by light leakage from the adjacent green color filter unit when the red light emitting device emits extra light that hits the adjacent green color filter unit. Figure 3 This is the light transmittance spectrum of the color filter unit. It can be seen that the green color filter unit is severely warped in the red light band. When the red light emitted by the red light-emitting device shines on the green color filter unit, the red light is not completely absorbed by the green color filter unit. Part of the red light is transmitted by the green color filter unit, causing the area that originally displayed green in the display screen to display red, causing the display screen of the display panel to appear red, affecting the display effect.

[0035] In order to solve at least one of the above technical problems, the embodiments of the present disclosure provide a display panel and a display device. The display panel and the display device provided by the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] In a first aspect, an embodiment of the present disclosure provides a structural diagram of a display panel. Figure 4 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 4As shown, the display panel includes: a substrate 401, a light-emitting device layer 402 located on the substrate 401 and arranged in sequence along a direction away from the substrate 401, an encapsulation layer 403 and a color film layer 404; the light-emitting device layer 402 includes: a first light-emitting device 402a and a second light-emitting device 402b; the color film layer 403 includes: a first color film unit 403a and a second color film unit 403b; the first light-emitting device 402a has the same color as the first color film unit 403a and is arranged correspondingly, and the second light-emitting device 402b has the same color as the second color film unit 403b and is arranged correspondingly; the display panel also includes: a light-blocking structure 405; the light-blocking structure 405 is configured to block the light from the first light-emitting device 402a to the second color film unit 403b.

[0037] The substrate 401 can be made of a rigid material such as glass, which can improve the bearing capacity of the substrate 401 for other film layers thereon. Of course, the substrate 401 can also be made of a flexible material such as polyimide (PI), which can improve the overall bending and tensile resistance of the display panel, and avoid the stress generated during bending, stretching, and twisting that causes the substrate 401 to break, resulting in a poor circuit. In practical applications, the material of the substrate 401 can be reasonably selected according to actual needs to ensure that the display panel has good performance. A passivation layer, a buffer layer, and a planarization layer can generally be provided on the substrate 401, which can be formed using materials in reference to the relevant technology and are described in detail here.

[0038] The light-emitting device layer 402 may include a first light-emitting device 402a and a second light-emitting device 402b. Specifically, the first light-emitting device 402a may be a red light-emitting device, and the second light-emitting device 402b may be a green light-emitting device. Both the first light-emitting device 402a and the second light-emitting device 402b may include first and second electrodes disposed opposite each other, and an organic light-emitting layer located between the first and second electrodes. The difference between the two is that the organic light-emitting layer in the first light-emitting device 402a is red and can emit red light, while the organic light-emitting layer in the second light-emitting device 402b is green and can emit green light. The first and second electrodes have opposite polarities. The first electrode may be an anode, which may be made of at least one metal material such as silver (Ag), aluminum (Al), or titanium (Ti). The second electrode may be a cathode, which may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) to enhance the overall transparency of the display panel. Both the anode and cathode may be single-layer structures made of a single material, or multi-layer structures made of multiple materials, depending on actual needs. The organic light-emitting layer can be made of fluorescent materials and can emit light under the action of the electric field between the anode and the cathode to achieve a display function.

[0039] The encapsulation layer 403 can encapsulate the organic light-emitting layer in the light-emitting device layer 402 to prevent the intrusion of gases such as water and oxygen from the outside, which could corrode the material of the organic light-emitting layer. Generally, the encapsulation layer 403 is made of a multi-layer structure, including an inorganic encapsulation layer and an organic encapsulation layer. The organic encapsulation layer can be sandwiched between adjacent organic encapsulation layers. The inorganic encapsulation layer can block gases such as water and oxygen. The organic encapsulation layer is relatively flexible and can be filled between the inorganic encapsulation layers to act as a buffer, preventing the entire encapsulation layer 403 from breaking under external forces, causing encapsulation failure.

[0040] The color filter layer 404 can be disposed on the encapsulation layer 403, forming a polarizer-free COE (Color Filter On Encapsulation) structure. The color filter layer 404 can include a first color filter unit 404a and a second color filter unit 404b. Specifically, the first color filter unit 404a can be a red color filter unit, and the second color filter unit 404b can be a green color filter unit. The first color filter unit 404a can filter red light from ambient light and absorb light of other colors. The second color filter unit 404b can filter green light from ambient light and absorb light of other colors, thereby preventing ambient light reflection from affecting the display effect.

[0041] In the display panel provided by the embodiments of the present disclosure, the light generated by each light-emitting device can be emitted at a wide viewing angle. Light emitted by the first light-emitting device 402a (i.e., the red light-emitting device) can not only illuminate the first color filter unit 404a, but may also illuminate the second color filter unit 404b. Due to the spectral characteristics of the color filter units, the second color filter unit 404b cannot completely absorb the light emitted by the first light-emitting device 402a. A light-blocking structure 405 is provided in the light propagation path between the first light-emitting device 402a and the second color filter unit 404b. The light-blocking structure 405 blocks the light emitted by the first light-emitting device 402a from the second color filter unit 404b, preventing it from irradiating the second color filter unit 404b. This prevents light emitted by the first light-emitting device 402a from being transmitted through the second color filter unit 404b, preventing areas of the display that originally displayed green from appearing red. This improves the red tint problem and enhances the display quality.

[0042] In some embodiments, the light emitting device layer 402 further includes a third light emitting device 402c; the color filter layer 404 further includes a third color filter unit 404c; the third light emitting device 402c and the third color filter unit 404c have the same color and are arranged correspondingly.

[0043] The third color filter unit 404c can specifically be a blue light-emitting device that can emit blue light. The third color filter unit 404c can filter blue light from ambient light and absorb light of other colors. Furthermore, the third color filter unit 404c can transmit light emitted by the third light-emitting device 402c, preventing it from being blocked. Furthermore, the third light-emitting device 402c, along with the first and second light-emitting devices 402a and 402b, can collectively achieve color display.

[0044] In some embodiments, as Figure 4 As shown, the display panel also includes: a filling layer 406 and a black matrix 407 arranged in sequence on the side of the encapsulation layer 403 away from the substrate 401; the filling layer 406 has a groove formed at a position between the first color film unit 404a and the second color film unit 404b; part of the black matrix 407 is arranged in the groove of the filling layer 406 to serve as a light blocking structure 405.

[0045] The filling layer 406 can be made of optical adhesive and has a certain thickness to support the black matrix 407 thereon. The black matrix 407 can block ambient light, preventing it from reaching the cathodes of each light-emitting device, thereby preventing the ambient light from affecting the display image. At the same time, the filling layer 406 has a groove formed between the first color filter unit 404a and the second color filter unit 404b. Part of the black matrix 407 can be disposed within the groove. Because the black matrix 407 within the groove is closer to the first light-emitting device 402a than the second color filter unit 404b, the black matrix 407 within the groove can serve as a light-blocking structure 405 to block light from the first light-emitting device 402a to the second color filter unit 404b, preventing the light from reaching the second color filter unit 404b. This prevents light emitted by the first light-emitting device 402a from being transmitted through the second color filter unit 404b, preventing areas of the display image that originally displayed green from displaying red, thereby improving the red tint problem of the display image and thereby enhancing the display effect of the display image. Specifically, the thickness of the black matrix 407 may be 1 micrometer to 2 micrometers.

[0046] Figure 5 A schematic structural diagram of another display panel provided in an embodiment of the present disclosure is shown. Figure 6 A structural diagram of another display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 5 and Figure 6As shown, the display panel also includes: a pixel defining layer 408 located on the substrate 401; the first light-emitting device 402a, the second light-emitting device 402b and the third light-emitting device 402c are located in the area defined by the pixel defining layer 408; the thickness of the pixel defining layer 408 around the first light-emitting device 402a is greater than the thickness of the pixel defining layer 407 around the second light-emitting device 402b and the third light-emitting device 402c to serve as a light-blocking structure 405.

[0047] The pixel-defining layer 408 surrounding the first light-emitting device 402a is thicker than the pixel-defining layer 407 surrounding the second and third light-emitting devices 402b, 402c, thereby serving as a light-blocking structure 405. This significantly increases the thickness of the pixel-defining layer 408 surrounding the first light-emitting device 402a, acting as a light-blocking structure 405 to block light from the first light-emitting device 402a and reaching the second color filter unit 404b, preventing it from reaching the second color filter unit 404b. This prevents light from the first light-emitting device 402a from being transmitted through the second color filter unit 404b, preventing areas of the display that originally displayed green from appearing red. This improves the red tint problem and enhances the display quality. Specifically, the pixel-defining layer 408 surrounding the first light-emitting device 402a is 1.5 to 3 microns thick, while the pixel-defining layer 407 surrounding the second and third light-emitting devices 402b, 402c is 0.8 to 1.0 microns thick.

[0048] Figure 7 A structural diagram of another display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 7 As shown, the thickness of the black matrix 407 between the first color filter unit 404a and the second color filter unit 404b is greater than the thickness of the black matrix 407 between the second color filter unit 404b and the third color filter unit 404c; the thickness of the black matrix 404 between the first color filter unit 404a and the second color filter unit 404b is greater than the thickness of the black matrix 407 between the first color filter unit 404a and the third color filter unit 404c.

[0049] In the disclosed embodiment, the shielding effect of the black matrix 407 can be further enhanced by increasing the thickness of the black matrix 407 in each area. Specifically, the thickness of the black matrix 407 is greatest between the first color filter unit 404a and the second color filter unit 404b. This can further facilitate blocking the light from the first light-emitting device 402a to the second color filter unit 404b, preventing the light from irradiating the second color filter unit 404b. This prevents the light emitted by the first light-emitting device 402a from being transmitted through the second color filter unit 404b, preventing areas of the display that originally displayed green from displaying red. This improves the reddish tint problem of the display and enhances the display quality.

[0050] In some embodiments, the orthographic projection of the first light-emitting device 402a on the substrate 401 coincides with the center of the orthographic projection of the first color film unit 404a on the substrate 401; the orthographic projection of the second light-emitting device 402b on the substrate 401 coincides with the center of the orthographic projection of the second color film unit 404b on the substrate 401; and the orthographic projection of the third light-emitting device 402c on the substrate 401 coincides with the center of the orthographic projection of the third color film unit 404c on the substrate 401.

[0051] Light-emitting devices of the same color and color film units can correspond one to one and be arranged opposite each other, which can ensure that the color film units of the same color can transmit the light emitted by the corresponding light-emitting devices, avoid blocking the light emitted by each light-emitting device, and thus improve the utilization rate of the light emitted by the light-emitting devices.

[0052] In a second aspect, an embodiment of the present disclosure provides a display device, which includes a display panel as provided in any of the above embodiments. The display device can specifically be: a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function. Its implementation principle and beneficial effects are the same as those of the above-mentioned display panel, and will not be repeated here.

[0053] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display panel, characterized in that: The display panel comprises: a substrate, a light emitting device layer, an encapsulation layer and a color filter layer located on the substrate and arranged in sequence in a direction away from the substrate; The light-emitting device layer includes: a first light-emitting device and a second light-emitting device; the color filter layer includes: a first color filter unit and a second color filter unit; the first light-emitting device and the first color filter unit have the same color and are arranged correspondingly, and the second light-emitting device and the second color filter unit have the same color and are arranged correspondingly; The display panel further includes: a light blocking structure; the light blocking structure is configured to block the light irradiated from the first light emitting device to the second color film unit; The display panel further includes: a filling layer and a black matrix sequentially arranged on a side of the encapsulation layer away from the substrate; the filling layer is formed with a groove at a position between the first color filter unit and the second color filter unit; Part of the black matrix is ​​disposed in the groove of the filling layer to serve as the light blocking structure.

2. The display panel according to claim 1, wherein: The light-emitting device layer further includes: a third light-emitting device; the color filter layer further includes: a third color filter unit; the third light-emitting device and the third color filter unit have the same color and are arranged correspondingly.

3. The display panel according to claim 1, wherein: The thickness of the black matrix is ​​1 micrometer to 2 micrometers.

4. The display panel according to claim 2, wherein: The display panel further comprises: a pixel defining layer located on the substrate; the first light emitting device, the second light emitting device and the third light emitting device are located in an area defined by the pixel defining layer; The thickness of the pixel defining layer around the first light emitting device is greater than that around the second and third light emitting devices to serve as the light blocking structure.

5. The display panel according to claim 4, wherein: The thickness of the pixel defining layer around the first light emitting device is 1.5 microns to 3 microns; The pixel defining layer around the second light emitting device and the third light emitting device has a thickness of 0.8 micrometers to 1.0 micrometers.

6. The display panel according to claim 2, wherein: The thickness of the black matrix between the first color filter unit and the second color filter unit is greater than the thickness of the black matrix between the second color filter unit and the third color filter unit; The thickness of the black matrix between the first color filter unit and the second color filter unit is greater than the thickness of the black matrix between the first color filter unit and the third color filter unit.

7. The display panel according to claim 2, wherein: The orthographic projection of the first light emitting device on the substrate coincides with the center of the orthographic projection of the first color filter unit on the substrate; The orthographic projection of the second light emitting device on the substrate coincides with the center of the orthographic projection of the second color filter unit on the substrate; The orthographic projection of the third light emitting device on the substrate coincides with the center of the orthographic projection of the third color filter unit on the substrate.

8. The display panel according to claim 2, wherein: The first light emitting device includes a red light emitting device; the second light emitting device includes a green light emitting device; and the third light emitting device includes a blue light emitting device.

9. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 8.

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