Pixel demarcation layer and OLED (organic light emitting diode) device

Abstract

The embodiment of the invention provides a pixel demarcation layer and an OLED (organic light emitting diode) device, and relates to the technical field of display. The attenuation state of luminous materials of each pixel unit can be identical, and in addition, the color staining caused by solution overflow can be avoided. The pixel demarcation layer comprises a plurality of openings, wherein each opening comprises a bottom surface opening, a top surface opening and a side wall, the openings at least comprise a first opening for limiting a first pixel unit and a second opening for limiting a second pixel unit, the first opening is filled with first pixel luminous materials, the second opening is filled with second pixel luminous materials, the attenuation speed of the first pixel luminous materials is lower than the attenuation speed of the second pixel luminous materials, the bottom surface opening area of the first opening is smaller than the bottom surface opening area of the second opening, the side wall of each opening is provided with a preset reference surface, the space limited by each opening comprises a main body space in the reference surface and an expansion space outside the reference surface; the expansion space size of the first opening is greater than the expansion space size of the second opening. The pixel demarcation layer is used for preparing the OLED device.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel defining layer and an OLED device. Background technique [0002] OLED (Organic Light Emitting Diode, Organic Light Emitting Diode) display devices have attracted extensive attention due to their characteristics such as self-illumination, wide viewing angle, fast response, and flexibility. [0003] At present, in OLED devices, the properties of different color light-emitting materials are quite different; among them, the performance of red-light materials is better, the performance of green-light materials is second, and the performance of blue-light materials is the worst. In this way, during the use of the OLED device, the attenuation speed of the red light material is relatively slow, while the attenuation speed of the blue light material is relatively fast, which will lead to a serious color shift problem. [0004] In order to ensure that the attenuation state of eac...

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Problems solved by technology

[0005] However, due to the longer wavelength of red light, the optical cavity length of its pixel is also longer, so the film thickness of the light-emitting layer of the red light material is relatively thick; on this basis, for the OLED device using the above design, in When organic light-emitting materials are produced by solution methods such as inkjet printing methods, since the red pixel unit has a small aperture ratio, its ink holding capacity is relatively small, and its film thickness is relatively thick, so it requires more ink

Based on the above reasons, it will cause the ink in the red pixel unit to easily overflow into other adjacent pixel units, resulting in cross-color

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