How to manufacture a display screen

Abstract

To provide a colored electronic display screen which offers superior aesthetic quality without having to increase thickness.SOLUTION: The present invention relates to a method of manufacturing a colored electronic display screen (10) including an active cell (11) and at least one polarizing film (114). The polarizing film (114) comprises an optical layer (115) and a tinted adhesive layer (116), where the polarizing film (114) is bonded to the active cell (11) via the adhesive layer (116).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the field of display screens, particularly electronic display screens. In particular, the present invention relates to a method for manufacturing such display screens.

Background Art

[0002] There are many electronic display screen technologies, including liquid crystal displays that are very commonly used in all types of applications.

[0003] A liquid crystal display screen can be a raster scan display or a segmented display, includes a liquid crystal cell, and on both sides of the liquid crystal cell, optical films, particularly a polarizing film and a color film, are arranged to give a given color to the display screen.

[0004] Introducing color filters into the cell has several problems.

[0005] In particular, since the color filter can have a thickness of up to 100 μm, it is particularly troublesome in specific application fields of liquid crystal display screens intended to minimize the dimensions of components, such as the industry of portable clocks (e.g., wristwatches, pocket watches).

[0006] Also, since the color selection of the color filter is limited, the aesthetic possibilities of the final product are restricted, and the production of these color filters is not suitable for small-scale production lines and can have a significant impact on the production cost depending on the amount of color filters to be considered. Such small-scale production is required, for example, in the manufacturing industry of portable clocks where the display screen of the liquid crystal display is small.

Summary of the Invention

Means for Solving the Problems

[0007] The present invention solves the above-mentioned problems, and for this purpose relates to a method for manufacturing a color electronic display screen as described above, and this method is A step of obtaining a polarizing film including an optical layer on which an adhesive layer extends, A dyeing step of dyeing the adhesive layer, The process then includes an bonding step of bonding the polarizing film to the active cell using the adhesive layer.

[0008] In a particular implementation configuration, the dyeing step involves immersing the polarizing film in a dye bath and diffusing the contents of the dye bath into the adhesive layer.

[0009] In a specific implementation configuration, the dyeing step sequentially performs a dip coating operation to dip-coat the polarizing film, a rinsing operation to rinse the polarizing film, a drying operation to dry the polarizing film, and an operation to cut the polarizing film to a predetermined dimensional configuration.

[0010] In a specific implementation configuration, the dip coating operation is performed for 10 to 60 seconds.

[0011] In certain embodiments, the drying operation is carried out by forced air or by baking.

[0012] Other features and advantages of the present invention will become apparent by reading the following detailed description, which is provided as an example. However, this does not limit the scope of the invention. [Brief explanation of the drawing]

[0013] [Figure 1] A schematic cross-sectional view of a color electronic display screen according to a preferred example of the present invention is shown. Note that the diagram is not drawn to scale for the sake of simplicity. [Modes for carrying out the invention]

[0014] Figure 1 shows an example of the application of the color electronic display screen 10 according to the present invention, formed by a liquid crystal display (LCD). The present invention can be applied to any type of electronic display screen to display a screen including, for example, at least one organic light-emitting diode (OLED).

[0015] The objective of the present invention is to provide a display screen with a given monochrome color that remains stable even after time has passed.

[0016] The electronic display screen 10 includes an active cell 11 formed by liquid crystal cells to constitute a segmented display in an exemplary embodiment shown in Figure 1. This liquid crystal cell is formed between two substrates 110 made of glass, plastic, or the like, in a form well known to those skilled in the art, with translucent electrodes 111 fixed to each substrate 110, these two electrodes 111 separated by a seal frame 112, and liquid crystal 113 sealed within this seal frame 112.

[0017] Furthermore, the present invention can also be applied to liquid crystal display screens intended for displaying raster images.

[0018] The electronic display screen 10 includes at least one polarizing film 114, which includes an optical layer 115 on which a lightly colored adhesive layer 116 extends. The polarizing film 114 is bonded to the active cell 11 via the adhesive layer 116. The adhesive layer 116 is also known as "OCA," an acronym for "optically clear adhesives," and is made of, for example, an acrylic adhesive.

[0019] In particular, in the exemplary embodiment shown in Figure 1, the polarizing film 114 is bonded to each substrate 110 of the active cell 11. The two adhesive layers 116 that fix the polarizing film 114 can be lightly tinted to increase the color intensity or to bring it closer to the perceived target color.

[0020] In this document, the relative terms "front" and "back" each refer to the positional relationship of the elements of the electronic display screen 10 with respect to the user when the user is looking at the display, as schematically shown in FIG. 1.

[0021] Thus, the electronic display screen 10 includes a front polarizing film 114 and a rear polarizing film 114, which are fixed by a front adhesive layer 116 and a rear adhesive layer 116, respectively. The rear adhesive layer 116 can be configured to have a light scattering ability.

[0022] As shown in FIG. 1, the electronic display screen 10 further includes a back layer 117 adhered to the rear polarizing film 114 using a back adhesive layer 118, and this back layer 117 is, for example, black.

[0023] Of course, all of the adhesive layers of the present invention are light-transmissive or at least semi-light-transmissive.

[0024] The color electronic display screen 10 is manufactured using a method including the steps of obtaining a polarizing film 114 on which an adhesive layer 116 extends, dyeing the adhesive layer 116, and then adhering the polarizing film 114 to the active cell 11 through the adhesive layer 116. These steps can be performed for a plurality of polarizing films 114 of the same electronic display screen 10.

[0025] The dyeing step of dyeing the adhesive layer 116 can involve dipping the polarizing film 114 on which the adhesive layer 116 is deposited into a dye bath and diffusing the contents of the bath into the adhesive layer 116. The bath can be composed of an aqueous solution, a solvent, and an acrylic pigment. Typically, the bath can be composed of a composition suitable for dyeing plastic materials that can be obtained by those skilled in the art. Advantageously, after the dyeing step, the adhesive layer 116 retains its adhesiveness. Also, the dyeing step has the advantage of not affecting the thickness of the polarizing film 114.

[0026] In addition, in the dyeing step, in particular, operations such as dip coating the polarizing film 114, rinsing the polarizing film 114, drying the polarizing film 114, and cutting the polarizing film 114 can be sequentially performed, whereby the polarizing film 114 has a predetermined shape and dimensional configuration.

[0027] For example, the dip coating operation is performed for 10 to 60 seconds, preferably 30 to 45 seconds. The color intensity of the polarizing film 114 is proportional to the duration of the dip coating operation. This dip coating operation can be carried out in a tank at low temperature, i.e., the ambient temperature, or in a tank at high temperature, i.e., a temperature higher than 50°C. By performing the dip coating operation at high temperature, advantageously, the color can be distributed more uniformly and more rapidly on the polarizing film 114.

[0028] In addition, the drying operation can be carried out by using forced air or baking in a furnace, for example, at 70°C for 5 minutes.

[0029] More generally, the implementation examples and embodiments discussed above are described by way of example, and therefore, other alternative forms are also possible.

[0030] Advantageously, the present invention does not increase the thickness of the electronic display screen 10 because there is no need for an additional color film. The present invention further enables fine control of the color of the electronic display screen 10. This is because only controlling the composition of the tank, the dip coating time, and the temperature of the tank during the dip coating operation, or the combination of the dyeing of at least two polarizing films, is necessary to obtain the desired color.

Explanation of Reference Numerals

[0031] 10 Color electronic display screen 11 Active cell 110 Substrate 111 Electrode 112 Seal frame 113 LCD 114 Polarizing film 115 Optical layer 116 Adhesive layer 117 Back layer 118 Backside adhesive layer

Claims

1. A method for manufacturing a color electronic display screen (10), The steps include obtaining a polarizing film (114) which includes an optical layer (115) on which an adhesive layer (116) extends, A dyeing step of dyeing the adhesive layer (116), The process then includes an bonding step of using the adhesive layer (116) to bond the polarizing film (114) to the active cell (11), The dyeing step involves immersing the polarizing film (114) on which the adhesive layer (116) is deposited in a dye bath to diffuse the contents of the dye bath into the adhesive layer (116), In the aforementioned staining step, A dip coating operation in which the polarizing film (114) is dip coated, The operation of rinsing the polarizing film (114), A drying operation to dry the polarizing film (114), The polarizing film (114) is sequentially cut to a predetermined size configuration. After the dyeing step, the adhesive layer (116) maintains its adhesive properties. A method characterized by the following:

2. The aforementioned dip coating operation is performed for 10 to 60 seconds. The method according to claim 1, characterized by the features described above.

3. The drying operation is carried out by forced air or by baking. The method according to claim 1, characterized by the features described above.

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