Flexible display panel and preparation method thereof

Abstract

The invention provides a flexible display panel and a preparation method thereof. The flexible display panel comprises a flexible substrate, a light emitting device layer arranged on the flexible substrate, a touch layer positioned on the upper side of the light emitting device layer, and a polarization layer positioned on the touch layer, wherein the touch layer and the polarization layer are independently provided with one side which is close to each other, and one side which is far away from each other; in addition, one side, which deviates from each other, of the touch layer and / or polarization layer is pasted with an addition layer; and the Passion ratio of the addition layer is negative. One side, which deviates from each other, of the touch layer and / or polarization layer of the flexible display panel is pasted with the addition layer of which the Passion ratio is negative, so that stress distribution among membranes is changed, so that adhesive force between the polarizationlayer and the touch layer is increased, a membrane separation phenomenon is avoided, and the bendable property and the service life of the flexible display panel are improved.

Description

Technical field [0001] The invention relates to the technical field of display panel manufacturing, in particular to a flexible display panel and a preparation method thereof. Background technique [0002] Organic electroluminescence (OLED) devices have the characteristics of low power consumption, lightness, high brightness, wide field of view and fast response. In addition, one of the most eye-catching features of OLED devices is that they can achieve flexible display functions, making them widely used in portable applications. Electronic equipment, wearable electronic equipment, automotive electronic equipment and many other fields. [0003] Flexible OLED devices generally use a flexible polymer substrate as a carrier, and are formed by depositing a transparent anode, a metal cathode, and two or more organic light-emitting layers sandwiched between the two. The organic light emitting layer generally includes a hole injection layer, a hole transport layer, a light emitting layer...

AI Technical Summary

Problems solved by technology

In practical applications, the flexible display panel is usually bent. When the flexible display panel is curled or unfolded, the materials of the touch layer 30 ′ and the POL layer 40 ′ of the flexible display panel are different, and the bending ability is quite different. The continuous application of stress will cause the separation of the touch layer 30' and the POL layer 40' of the OLED device, causing physical and structural damage to the OLED display panel and causing separation from each other, which makes it difficult to guarantee the performance of the flexible OLED display device

[0005] Aiming at the above-mentioned problem that the touch layer and the POL layer attached to each other in the flexible display panel are easy to separate from each other, a solution in the prior art is to coat a thicker optical glue between the touch layer and the POL layer to Increase the bonding force between the two film layers, thereby reducing the possibility of separation of the two film layers. However, this method will make the entire flexible display panel thicker, which will increase the maximum strain suffered during the bending process. The bending stress of each film layer is also relatively high, which makes the effect of preventing the separation of the touch layer and the POL layer not good

Another solution in the prior art is to add an interlocking structure or increase the roughness of the surface between the touch layer and the POL layer to prevent the two from being separated from each other. hard to guarantee

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