COLOR FILTER COVER PLATE, PREPARATION METHOD THEREOF, AND DISPLAY PANEL

Abstract

The present invention provides a color filter cover plate, including a substrate layer. A plurality of light shielding strips are disposed on the substrate layer at intervals, and a color filter layer is disposed between the light shielding strips. A bank layer is disposed on the light shielding strip, and a metal layer is disposed on a side surface of each of the light shielding strips or the bank layer facing the color filter layer. The present invention provides a color filter cover plate which adopts a novel structural arrangement, which reduces the absorption of the lateral incident light, thereby effectively improving the light extraction efficiency of the display panel.

Claims

1. A color filter cover plate, comprising a substrate layer; a plurality of light shielding strips disposed on the substrate layer at intervals; a color filter layer disposed between the light shielding strips; a bank layer disposed on the light shielding strips; and a metal layer disposed on a side surface of each of the light shielding strips or the bank layer facing the color filter layer.

2. The color filter cover plate according to claim 1, wherein the metal layer has a reflectance to incident light greater than 80%.

3. The color filter cover plate according to claim 1, wherein a thickness of the metal layer ranges from 100 nm to 2000 nm.

4. The color filter cover plate according to claim 1, wherein the bank layer is a portion of the light shielding strip disposed under the bank layer.

5. The color filter cover plate according to claim 1, wherein a thickness of each of the light shielding strips ranges from 100 nm to 5 μm.

6. The color filter cover plate according to claim 1, wherein a height of the bank layer ranges from 1 μm to 10 μm.

7. The color filter cover plate according to claim 1, wherein the bank layer is made of an organic resin material containing a fluorine element.

8. A method of preparing the color filter cover plate according to claim 1, comprising: step S1, providing a substrate, forming the light shielding strips on the substrate at intervals, wherein a groove is formed between adjacent light shielding strips; step S2, forming the bank layer on the light shielding strip; step S3, forming the color filter layer in the groove; and step S4, forming the metal layer on a side surface of each of the light shielding strips or the bank layer facing the groove.

9. The method of preparing the color filter cover plate according to claim 8, wherein the step S1 further comprises providing a hydrophilic treatment to a surface of the substrate.

10. A display panel, comprising the color filter cover plate according to claim 1.

Description

DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following figures described in the embodiments will be briefly introduced. It is obvious that the drawings described below are merely some embodiments of the present invention, other drawings can also be obtained by the person ordinary skilled in the field based on these drawings without doing any creative activity.

[0044] FIG. 1 is a schematic structural view of a color filter cover plate according to an embodiment of the present invention after step S1.

[0045] FIG. 2 is a schematic view showing a structure of the color filter cover plate of FIG. 1 after step S2.

[0046] FIG. 3 is a schematic view showing a structure of the color filter cover plate of FIG. 1 after step S3.

[0047] FIG. 4 is a schematic view showing a structure of the color filter cover plate of FIG. 1 after step S4.

[0048] FIG. 5 is a schematic view showing a structure of the color filter cover plate of FIG. 1 after step S5.

[0049] FIG. 6 is a schematic structural view of a color filter cover plate according to another embodiment of the present invention.

[0050] FIG. 7 is a schematic diagram showing an optical path in a color filter cover plate according to an embodiment of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0051] The color filter cover plate, the preparation method thereof, and the technical solution of the display panel according to the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0052] The present invention relates to a structure of a color filter cover plate, and to a method for preparing the same. In order to avoid unnecessary description, the structure of the color filter cover plate according to the present invention will be described in conjunction with the preparation method.

[0053] An embodiment of the present invention provides a method of preparing a color filter cover plate according to the present invention, including the following steps:

[0054] Step S1, providing a glass substrate 101 and performing UV treatment on the glass substrate 101 to form a hydrophilic surface. Following, a copper sulfide of 2-3 μm thick is deposited on the glass substrate 101 as a light shielding strip 102 by a sputter process, and the completed structure is shown in FIG. 1.

[0055] Step S2, coating a fluorine-containing organic photoresist material on the light shielding strip 102 by a slit coating process. After exposure and development processes, a bank layer 103 structure having a hydrophobic surface of 2-5 μm is obtained. A groove structure 110 is formed between the bank layer 103 and the light shielding strip therebelow, and the completed structure is shown in FIG. 2.

[0056] Step S3, dropping an ink material for preparing a quantum dot red/green/blue color filter layer to the groove 110 by an inkjet printing (IJP) process. Each of the red/green/blue color filter layers 104 having good uniformity are formed by the evaporation process under reduced pressure and a heating process. The completed structure is shown in FIG. 3

[0057] Step S4, preparing a metal layer 105 on the bank layer 103. It uses thermal evaporation combined with a fine pitch photo mask technology to form a 200 nm thick metal silver as a metal layer. The completed structure is shown in FIG. 4.

[0058] Step S5, forming a 500-800 nm thick SiN passivation layer on a surface of the cover plate by a PECVD method as a protective layer of the color filter cover plate. The completed structure is shown in FIG. 5. The structure as shown in FIG. 5 is also a complete structure of the color filter cover plate provided by an embodiment of the present invention.

[0059] Further, in another embodiment, it provides another structure of a color filter cover plate according to the present invention, which adopts a novel structure arrangement between the bank layer and the light shielding strip. The structure is shown in FIG. 6.

[0060] As shown in FIG. 6, the bank layer and the light shielding strip are combined into an integral structure composed of the same material. That is, the position of the original bank layer is replaced by the convex portion 111 of the light shielding strip 102, wherein the metal layer 105 is disposed on a surface of the convex portion 111.

[0061] Further, in another embodiment, the arrangement of the metal layer 105 does not need to completely cover the surface of the bank layer 103. The inventive concept of the present invention can be realized only by forming the metal layer 105 on a side surface of the bank layer 103 facing the color filter layer 104.

[0062] Please refer to FIG. 7, which illustrates an optical path diagram when the color filter cover plate of the present invention is applied to a display panel. The display panel is exemplified by an OLED display panel but is not limited thereto. As shown in FIG. 7, the light generated by the OLED device 100 of the display panel is incident to the color filter cover plate. As indicated by the arrow in the figure, the emitted light directly passes through the color filter layer 103 and the color filter cover plate. The laterally emitted light, after being reflected by the metal layer 105 disposed on a side of the bank layer 104, can be reused, and cab also be emitted out from the color filter layer 103 and the color filter cover plate. In this way, at least a portion of the lateral incident light originally absorbed by the light shielding strip can be utilized again, thereby effectively improving the light extraction efficiency of the OLED device 100.

[0063] The present invention relates to a color filter cover plate by introducing a bank layer on the light shielding strip. By combining the two structures, the inks for printing the red/green/blue color resists are applied to a specific area during the preparation process. In this way, it is not necessary to use the usual post spacer (PS) structure, thereby simplifying the preparation process.

[0064] The description of the above exemplary embodiments is only for the purpose of understanding the invention. It is to be understood that the present invention is not limited to the disclosed exemplary embodiments. It is obvious to those skilled in the art that the above exemplary embodiments may be modified without departing from the scope and spirit of the present invention.