Light-emitting panel capable of emitting uniform light and method for manufacturing the same

• US 10,741,796 B2
• Filed: 11/30/2016
• Issued: 08/11/2020
• Est. Priority Date: 08/31/2016
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Liu, Zhaosong, Li, Songshan, Hsu, Yuan Jun
• Primary Examiner(s): Campbell, Shaun M
• Assistant Examiner(s): Chi, Suberr L
• Application Number:
  US15/324,181
• Publication Number:
  US 20180183012A1
• Time in Patent Office: 1,350 Days
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

Related to is the field of light-emitting panel manufacture, and a light-emitting panel and a method for manufacturing the same are provided, which aim to improve uniformity of light emission of an Organic Light-Emitting Diode (OLED) manufactured by Inkjet Printing (IJP). The light-emitting panel sequentially comprises an ITO substrate, a light-emitting layer, a light-shielding layer, and a cover glass. The method comprises forming a multilayer structure sequentially including an ITO substrate, a light-emitting layer, a light-shielding layer, and a cover glass. According to a size of an edge warp of a light-emitting area of the OLED, a light-shielding layer is designed at a corresponding position of the light-emitting area on the cover glass, and a position of a non-uniform edge is subjected to light-shielding processing, so that the problem of non-uniform light emission caused by the edge warp of the organic light-emitting layer is solved. A display part can thus be uniformly showed, thereby effectively improving the uniformity of light emission of the OLED manufactured by IJP.

Claims

1. A light-emitting panel capable of emitting uniform light, comprising an ITO substrate, a light-emitting layer, a light-shielding layer, and a cover glass which are sequentially stacked,

wherein the light-emitting layer comprises isolation dam bodies and light-emitting bodies which are alternately arranged, multiple organic light-emitting layers being sequentially stacked in the light-emitting bodies;

and

wherein the light-shielding layer comprises multiple light-shielding bodies spaced from each other;

wherein the multiple organic light-emitting layers are formed by an inkjet printing method, so that a top surface at a center position of each of the multiple organic light-emitting layers is substantially planer, and the top surface at an edge position of each of the multiple organic light-emitting layers is warped;

wherein each of the multiple light-shielding bodies directly contacts and covers one of the isolation dam bodies;

wherein all of the top surface at the edge position of each of the multiple organic light-emitting layers is covered by one of the multiple light-shielding bodies, and all of the top surface at the center position of each of the multiple organic light-emitting layers is exposed between an adjacent two of the multiple light-shielding bodies.

2. The light-emitting panel capable of emitting uniform light according to claim 1, wherein a longitudinal cross section of the isolation dam body forms a first isosceles trapezoid, and a long bottom edge of the first isosceles trapezoid is located close to one side of the ITO substrate.

3. The light-emitting panel capable of emitting uniform light according to claim 2, wherein in the longitudinal cross section, a length of the light-shielding body is equal to a length of the long bottom edge of the first isosceles trapezoid formed by the isolation dam body.

4. The light-emitting panel capable of emitting uniform light according to claim 2, wherein multiple openings are formed between adjacent isolation dam bodies, and longitudinal cross sections of the multiple openings form second isosceles trapezoids,

wherein a short bottom edge of the second isosceles trapezoid is located close to one side of the ITO substrate, and

wherein the multiple openings are used for placing the light-emitting bodies, adjacent light-emitting bodies being spaced apart by the isolation dam bodies.

5. The light-emitting panel capable of emitting uniform light according to claim 2, wherein a number of the light-shielding bodies is equal to a number of the isolation dam bodies, and the light-shielding bodies are located at positions corresponding to the isolation dam bodies.

6. The light-emitting panel capable of emitting uniform light according to claim 1, wherein a thickness of the light-shielding layer is less than 1 μ

m.

7. A method for manufacturing the light-emitting panel capable of emitting uniform light according to claim 1, comprising a procedure of forming a multilayer structure including the ITO substrate, the light-emitting layer, the light-shielding layer, and the cover glass which are sequentially stacked, wherein the light-emitting layer includes the isolation dam bodies and the light-emitting bodies which are alternately arranged, and the multiple organic light-emitting layers are sequentially stacked in the light-emitting body;

wherein the multiple organic light-emitting layers are formed by an inkjet printing method, so that a top surface at a center position of each of the multiple organic light-emitting layers is substantially planer, and the top surface at an edge position of each of the multiple organic light-emitting layers is warped;

wherein each of the multiple light-shielding bodies directly contacts and covers one of the isolation dam bodies;

wherein all of the top surface at the edge position of each of the multiple organic light-emitting layers is covered by one of the multiple light-shielding bodies, and all of the top surface at the center position of each of the multiple organic light-emitting layers is exposed between an adjacent two of the multiple light-shielding bodies.

8. The method for manufacturing the light-emitting panel capable of emitting uniform light according to claim 7, wherein the procedure of forming a multilayer structure including the ITO substrate, the light-emitting layer, the light-shielding layer, and the cover glass which are sequentially stacked, wherein the light-emitting layer includes the isolation dam bodies and the light-emitting bodies which are alternately arranged, and the multiple organic light-emitting layers are sequentially stacked in the light-emitting body, further includes:

step 1;

manufacturing the light-emitting layer on the ITO substrate, comprising sub-steps of;

providing the ITO substrate;

coating an isolation layer on the ITO substrate;

exposing and developing the isolation layer so as to obtain the isolation dam bodies and multiple openings; and

manufacturing the sequentially stacked multiple organic light-emitting layers at the formed multiple openings, namely, forming the light-emitting bodies;

step 2;

manufacturing the light-shielding layer on the cover glass, comprising the sub-steps of;

providing the cover glass; and

forming the multiple light-shielding bodies on the cover glass, i.e., forming the light-shielding layer; and

step 3;

performing packaging, comprising a sub-step of;

packaging a light-emitting part manufactured in step 1 and a light-shielding part manufactured in step 2 with a sealant, so that the light-emitting panel is obtained.

9. The method for manufacturing the light-emitting panel capable of emitting uniform light according to claim 8, wherein longitudinal cross sections of the isolation dam bodies are first isosceles trapezoids, a long bottom edge of the first isosceles trapezoid is located close to one side of the ITO substrate, and

wherein in the sub-step of exposing and developing the isolation layer so as to form the isolation dam body, the multiple openings are formed between adjacent isolation dam bodies, and longitudinal cross sections of the multiple openings form second isosceles trapezoids,

wherein a short bottom edge of the second isosceles trapezoid is located close to one side of the ITO substrate, and the multiple openings are used for placing the light-emitting bodies, adjacent light-emitting bodies being spaced apart by the isolation dam bodies.

10. The method for manufacturing the light-emitting panel capable of emitting uniform light according to claim 9, wherein a number of the light-shielding bodies is equal to a number of the isolation dam bodies, and the light-shielding bodies are located at positions corresponding to the isolation dam bodies.

11. The method for manufacturing the light-emitting panel capable of emitting uniform light according to claim 10, wherein the isolation dam bodies manufactured in step 1 are aligned with the light-shielding bodies manufactured in step 2 under vacuum conditions, followed by press fitting and bake curing to complete the packaging.