Pixel arrangement display equipment capable of improving pixel resolution and evaporation method

Abstract

The invention relates to the technical field of OLED device manufacturing, in particular to pixel arrangement display equipment capable of improving pixel resolution and an evaporation method. A quadrangular R pixel, a G pixel and a B pixel which can be independently controlled and emit light are sequentially arranged on an evaporation substrate; the adjacent pixels with the same appearance and color are used as independent units; and EL film layer evaporation film formation is carried out on each independent unit by using an independent FMM hole. Compared with the MASK of the existing FMM technology, the R, G and B pixel MASK of the scheme of the invention is easy to process and not easy to deform due to larger widths of the opening and the connecting bridge when OLED screens with the same resolution ratio are produced; the distance between different pixels is increased, so that color mixing is avoided, the product yield is improved, the evaporation alignment Margin is larger, the evaporation process is easy to carry out, the productivity is improved due to the fact that the FMM replacement frequency is reduced, and the FMM cleaning loss is reduced; and the OLED display screen with higher pixel density can be produced, and the OLED display screen has very strong creativity.

Description

technical field [0001] The invention relates to the technical field of OLED device fabrication, in particular to a pixel arrangement display device and an evaporation method capable of improving pixel resolution. Background technique [0002] At present, most OLED devices are produced by using a metal mask (FineMetalMask, FMM) to evaporate the EL film layer of RGB pixels. Each FMM opening corresponds to a pixel. The existing mass production technology FMM designs an opening to conduct single-layer film evaporation of a pixel. plated, such as figure 1 shown. [0003] In a full-color organic EL display device, generally, organic EL elements including light-emitting layers of red (R), green (G), and blue (B) colors are formed on a substrate as subpixel arrays. Color image display is performed by selectively making these organic EL elements emit light with a desired luminance using TFTs. With the increasing demand for high resolution in the market, the aperture diameter of FM...

AI Technical Summary

Problems solved by technology

When the resolution reaches more than 300ppi, this arrangement requires that the openings and connecting bridges (ribs connecting adjacent openings) of the fine metal mask (FMM) are very small, which not only makes the processing of the mask (MASK) very difficult, but also Moreover, the alignment accuracy of the MASK, the shadow of the MASK, and the deformation of the MASK affected by other factors will seriously affect the evaporation of organic light-emitting materials to form a fine colored pixel pattern.

[0004] In response to this problem in the industry, although leading companies are also actively researching new technologies represented by LITI (laser thermal transfer printing) in order to produce high-resolution OLED displays, these new technologies still have many shortcomings, and currently they cannot Low yield when used in mass production or mass production

For example, it is necessary to increase the production process and additional process technology, resulting in low production efficiency; it is necessary to increase equipment and raw materials, and even to develop special raw materials, resulting in increased investment and costs, etc.

Even so, these new technologies are still difficult to produce ultra-high-resolution displays above 450ppi

At the same time, small FMM pixel openings will also increase the frequency of FMM cleaning in the continuous evaporation process, resulting in reduced production capacity, waste of evaporation materials, and loss of FMM due to increased cleaning times.

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