US-12628533-B2 - Organic light emitting diode display device

US12628533B2US 12628533 B2US12628533 B2US 12628533B2US-12628533-B2

Abstract

An organic light emitting diode display device includes: a substrate including first to third subpixels; first to third light emitting diodes in the first to third subpixels, respectively, on the substrate; and a transmittance controlling layer on an outer surface of the substrate corresponding to an emission direction of a light emitted from the first to third light emitting diodes, the transmittance controlling layer including a first lens and a second lens covering the first lens, wherein one of the first to third subpixels includes a green subpixel, wherein the first lens is disposed to correspond to an emission area of the green subpixel, and wherein the second lens is disposed to correspond to the first to third subpixels.

Inventors

Je-Beom PARK
Sung-Rae LEE
Ji-Su YOON
Jin-Ryun Kim

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220914
Priority Date: 20211207

Claims (16)

1 . An organic light emitting diode display device comprising: a substrate including first, second, and third subpixels; first, second, and third light emitting diodes in the first, second, and third subpixels, respectively, on a first surface of the substrate; and a transmittance controlling layer on a second surface of the substrate corresponding to an emission direction of light emitted from the first, second, and third light emitting diodes, the transmittance controlling layer including a first lens and a second lens covering the first lens, the second surface of the substrate being opposite to the first surface of the substrate, wherein the second subpixel includes a green subpixel, wherein the first lens is disposed to correspond to an emission area of the green subpixel, wherein the second lens is disposed to correspond to the first, second, and third subpixels, wherein the second surface of the substrate has first and second areas overlapping the first and third subpixels, respectively, and wherein the second lens contacts the first and second areas of the second surface of the substrate.
2 . The device of claim 1 , wherein the second lens has an absorption wavelength peak of 530 nm to 540 nm.
3 . The device of claim 1 , wherein the second lens has a first thickness corresponding to the green subpixel and a second thickness corresponding to an outer periphery of the first lens, and wherein the second thickness is greater than the first thickness.
4 . The device of claim 3 , wherein the first thickness is a local minimum thickness of the second lens in the green subpixel.
5 . The device of claim 1 , wherein a refractive index of the first lens is greater than refractive indexes of the substrate and the second lens by 0.1 or more.
6 . The device of claim 5 , wherein the first lens has a refractive index of 1.6 to 1.8.
7 . The device of claim 6 , wherein the second lens has a refractive index of 1.4 to 1.5.
8 . The device of claim 7 , wherein the transmittance controlling layer further includes a planarizing layer covering the second lens, and wherein the planarizing layer has a refractive index of 1.4 to 1.5.
9 . The device of claim 1 , wherein the first, second, and third subpixels include one of red and blue subpixels.
10 . The device of claim 1 , wherein the first, second, and third light emitting diodes emit a white colored light, and wherein red, green and blue color filter patterns-are disposed between the transmittance controlling layer and the first, second, and third light emitting diodes to correspond to emission areas of the first to third subpixels.
11 . The device of claim 1 , wherein the substrate further includes a white subpixel, and wherein a fourth light emitting diode is disposed in the white subpixel on the substrate.
12 . The device of claim 11 , wherein a white color filter pattern is disposed between the transmittance controlling layer and the fourth light emitting diode to correspond to an emission area of the white subpixel.
13 . The device of claim 11 , wherein the white subpixel is exposed outside the second lens.
14 . The device of claim 1 , wherein the second lens directly contacts the first lens.
15 . The device of claim 1 , wherein the second surface of the substrate further has a third area overlapping the second subpixel, and the first lens contact the third area of the second surface of the substrate.
16 . The device of claim 1 , wherein a width of the second lens corresponds to a sum of a width of the first subpixel, a width of the second subpixel and a width of the third subpixel.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application claims the priority benefit of Republic of Korea Patent Application No. 10-2021-0174043 filed in Republic of Korea on Dec. 7, 2021, which is hereby incorporated by reference herein in its entirety. BACKGROUND Technical Field The present disclosure relates to an organic light emitting diode display device, and more particularly, to an organic light emitting diode display device where a color sense difference according to a viewing angle is improved. Discussion of the Related Art Recently, with the advent of an information-oriented society and as the interest in information displays for processing and displaying a massive amount of information and the demand for portable information media have increased, a display field has rapidly advanced. Thus, various light and thin flat panel display devices have been developed and highlighted. Among the various flat panel display devices, an organic light emitting diode (OLED) display device is an emissive type device and does not include a backlight unit used in a non-emissive type device such as a liquid crystal display (LCD) device. As a result, the OLED display device has a light weight and a thin profile. In addition, the OLED display device has advantages of a viewing angle, a contrast ratio, and power consumption as compared with the LCD device. Furthermore, the OLED display device can be driven with a low direct current (DC) voltage and has rapid response speed. Moreover, since the inner elements of the OLED display device have a solid phase, the OLED display device has high durability against an external impact and has a wide available temperature range. When a white color is displayed in the OLED display device, a color sense of a white color may be changed according to a viewing angle of a user. When the OLED display device displaying a white color is viewed from a side, a greenish phenomenon where a white color has a light green color may occur. The above color sense difference may be recognized by a user to cause a luminosity deterioration and may be recognized by a user as a display deterioration. SUMMARY Accordingly, the present disclosure is directed to an organic light emitting diode display device that substantially obviates one or more of the problems due to limitations and disadvantages of the related art. An object of the present disclosure is to provide an organic light emitting display device where a greenish phenomenon is improved. Another object of the present disclosure is to provide an organic light emitting diode display device where a recognition of a luminosity deterioration by a user is prevented by minimizing a color sense difference of a white color display. Additional features and advantages of the present disclosure will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosure. These and other advantages of the present disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. To achieve these and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, an organic light emitting diode display device includes: a substrate including first to third subpixels; first to third light emitting diodes in the first to third subpixels, respectively, on the substrate; and a transmittance controlling layer on an outer surface of the substrate corresponding to an emission direction of a light emitted from the first to third light emitting diodes, the transmittance controlling layer including a first lens and a second lens covering the first lens, wherein one of the first to third subpixels includes a green subpixel, wherein the first lens is disposed to correspond to an emission area of the green subpixel, and wherein the second lens is disposed to correspond to the first to third subpixels. It is to be understood that both the foregoing general description and the following detailed description are explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings: FIG. 1 is a cross-sectional view showing a unit pixel including four subpixels of an organic light emitting diode display device according to an embodiment of the present disclosure; FIG. 2 is a view showing a light emitting diode of an organic light emitting diode display device according to an embodiment of the present disclosure; FIG. 3A is a plan view showing a unit pixel including four