TWM625156U - display module - Google Patents

Abstract

A display module distinguishes a visible area and a non-visible area, and includes a display unit and a shading unit. The display unit is located in the visible area, and includes a display layer having a light-emitting side, and at least one polarizing layer disposed on the light-emitting side. The light shielding unit includes a linear polarizing film at least disposed on the display unit, and a light shielding layer disposed on the linear polarizing film and located in the non-visible area, and the absorption axis of the linear polarizing film and the absorption axis of the polarizing layer are between The included angle is not more than 45 degrees. In this case, the angle between the absorption axis of the linear polarizing film and the absorption axis of the adjacent polarizing layer is not greater than 45 degrees, so that the overlapping linear polarizing film and the polarizing layer have good transmittance, and When the display module does not display an image, the color difference between the visible area and the non-visible area is reduced, so as to achieve a visual effect of black as a whole.

Description

display module

The present invention relates to a display module, in particular to a display module with an integral black appearance.

In modern life, LCD screens are widely deployed on vehicle consoles, instrument panels or control panels of other household appliances due to their low power consumption and high chroma. As the technology of liquid crystal display screen has matured day by day, in addition to the improvement of performance, manufacturers and consumers have also begun to pursue the visual effect of the appearance of liquid crystal display screen. Therefore, when no image is displayed, how to make the appearance of the image display area and the non-image area of the liquid crystal display panel closer to the visual effect of one-piece black is one of the goals pursued by the industry.

Therefore, the purpose of the present invention is to provide a display module that can present the visual effect of integral black.

Therefore, the display module of the present invention distinguishes a visible area and a non-viewable area, and the display module includes a display unit and a light-shielding unit.

The display unit is located in the visible area, and includes a display layer and at least one polarizing layer disposed on the display layer, the display layer has a light-emitting side capable of displaying a picture, and the polarizing layer is disposed on the light-emitting side.

The light shielding unit includes a linear polarizing film disposed at least on the polarizing layer, and a light shielding layer disposed on the linear polarizing film and located in the non-visible area, and the absorption axis of the linear polarizing film is adjacent to the polarizing layer of the display unit. The angle between the absorption axes is not more than 45 degrees.

The effect of the present invention is: by arranging a linear polarizing film on the display unit, and the angle between the absorption axis of the linear polarizing film and the absorption axis of the polarizing layer adjacent to the display unit is not greater than 45 degrees, the display unit can be The unit maintains a good penetration rate when it is activated, and when the display unit is not activated, the color difference between the visible area and the non-visual area is reduced, so that the appearance of the display module is closer to the same one-body black. Visual effect.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are designated by the same reference numerals. In addition, it should be noted that the drawings of the present invention only show the relative structure and/or positional relationship among the elements, and are not related to the actual size of each element.

Referring to FIG. 1 and FIG. 2 , in an embodiment of the novel display module, a viewable area VA and a non-viewable area NA are distinguished. The display module includes a display unit 2 , a shading unit 3 , an anti-reflection unit 4 , and a bonding unit 5 . Wherein, in this embodiment, the non-visible area NA is formed on the side of the visible area VA as an example. However, it should be noted that the distribution positions of the non-visible area NA and the visible area VA can be different according to design requirements. The displayed form is restricted.

The display unit 2 is disposed in the visible area VA, and includes a display layer 21 and two polarizing layers 22 respectively disposed on opposite sides of the display layer 21 . The display layer 21 has a light-emitting side 211 that can display a picture or emit light. , one of the polarizing layers 22 is disposed on the light-emitting side 211 , and the other polarizing layer 22 is disposed on the side of the display layer 21 opposite to the light-emitting side 211 . In this embodiment, the polarizing layer 22 is a laminated structure, which is composed of a polyvinyl alcohol (PVA) film that absorbs iodine, and two triacetate cellulose layers (TAC) respectively disposed on opposite sides of the polyvinyl alcohol film. iodine series polarizer.

In this embodiment, the display unit 2 is a liquid crystal display (see FIG. 1 ), including the display layer 21 and two polarizing layers 22 respectively disposed on opposite sides of the display layer 21 as an example, the display layer 21 It is a laminated structure, with a liquid crystal layer, a color filter layer disposed on opposite sides of the liquid crystal layer, and a driving layer with thin film transistors, and the light emitting side 211 is located on the display layer 21 adjacent to the On one side of the color filter layer, the two polarizing layers 22 are respectively disposed on the outside of the color filter layer and the driving layer, and their absorption axes are sandwiched by 90 degrees from each other. Since other detailed structures of the liquid crystal display are well known in the art, they will not be described in detail here.

In some embodiments, the display unit 2 may also be an organic light emitting diode display (OLED). At this time, the display layer 21 of the display unit 2 is an organic light emitting diode structure, and only a single polarizing layer 22 needs to be disposed on the light emitting side 211 of the display layer 21 , which is not limited to this embodiment.

In addition, the non-visible area NA may be configured with other electronic components (not shown) such as driving control circuits that can be used to control or activate the display unit 2, because these electronic components may vary according to actual control requirements, and belong to the technical field. It is well known, therefore, it will not be repeated here.

The light shielding unit 3 includes a linear polarizing film 31 disposed at least on the adjacent polarizing layer 22, and a light shielding layer 32 disposed on the linear polarizing film 31 and located in the non-visible area NA, and the linear polarizing film 31 is The included angle between the absorption axis and the absorption axis of the polarizing layer 22 adjacent to the display unit 2 is not greater than 45 degrees.

In this embodiment, the linear polarizing film 31 covers both the visible area VA and the non-visible area NA, and also covers the light shielding layer 32 . The linear polarizing film 31 is of the same structure and material as the polarizing layer 22, and is also a laminated layer composed of a polyvinyl alcohol film that absorbs iodine and two triacetate fiber layers respectively disposed on both sides of the polyvinyl alcohol film. structure. The light shielding layer 32 is selected from an opaque material (eg, black ink), so that the display unit 2 can only display images from the range of the visible area VA.

2 illustrates the relative position of the absorption axis direction A1 of the polarizing layer 22 disposed on the light-emitting side 211 and the absorption axis direction A2 of the linear polarizing film 31, and the included angle I between the absorption axis directions A1 and A2 (that is, the linear polarizing film 31 and the angle between the absorption axes of the adjacent polarizing layers 22). In detail, the light-shielding unit 3 is disposed on the light-emitting side 211 of the display unit 2 , and is determined by the angle between the absorption axes of the polarizing layer 22 disposed on the light-emitting side 211 and the linear polarizing film 31 of the light-shielding unit 3 . It is not greater than 45 degrees to ensure that the total transmittance of light passing through the stacked linear polarizing film 31 and the polarizing layer 22 is not less than 45% when the display unit 2 is activated. Preferably, the included angle between the absorption axis of the linear polarizing film 31 and the absorption axis of the polarizing layer 22 adjacent to the display unit 2 (equivalent to the included angle I in FIG. 2 ) is between 30 degrees and 45 degrees, and the light passes through the phase. The total transmittance of the stacked linear polarizing film 31 and the polarizing layer 22 is between 45% and 68%, which can avoid the problem of insufficient brightness.

The anti-reflection unit 4 has light transmittance, and includes a protective layer 41 disposed on the side of the shading unit 3 opposite to the display unit 2 , and an anti-reflection layer 42 disposed on the protective layer 41 . In this embodiment, the protective layer 41 is selected from a glass cover plate, and the anti-reflection layer 42 is selected from a surface of ethylene terephthalate coated with an anti-glare-hard coating (AGHC). Ester (PET) film. The protective layer 41 covers the linear polarizing film 31 to prevent the linear polarizing film 31 from being damaged or falling off from the display unit 2 . The anti-reflection layer 42 can slow down the internal reflection of the light emitted from the display unit 2 , thereby increasing the light extraction rate and improving the brightness, chromaticity or contrast of the image displayed by the display module.

In detail, since the polarizing layer 22, the linear polarizing film 31, and the protective layer 41 made of materials with different refractive indices are stacked from the side of the display layer 21 for displaying light, the light passes through Different degrees of internal reflection and refraction will occur at the interface of the film layers of different materials, which will interfere with the displayed image of the display unit 2 (eg, chromaticity, brightness or contrast). Therefore, by disposing the anti-reflection layer 42 in the present invention, the light passes through the anti-reflection layer 42, and the reflected light causes destructive interference to other reflected light, thereby offsetting the influence of the reflected light between different film layers.

The bonding unit 5 includes a first bonding layer 51 for bonding the display unit 2 and the light-shielding unit 3 , and a second bonding layer 52 for bonding the light-shielding unit 3 and the anti-reflection unit 4 . In this embodiment, the first bonding layer 51 is selected from liquid optical clear adhesive (LOCA), and the second bonding layer 52 is selected from pressure sensitive adhesive (PSA).

It should be noted that, in some embodiments, only the shading unit 3 may be provided on the display unit 2 as required, and the bonding unit 5 and/or the anti-reflection unit 4 need not be provided.

Herein, when the display module is not displaying an image (ie, when the display unit 2 is not activated), the chromaticity value detection is performed, and the chromaticity value detection results are arranged in Table 1.

In this embodiment, the chromaticity value is detected by using a spectrophotometer (Spectrophotometer, model: CM700d, Konica Minolta) from the display module close to the shading unit 3, and corresponding to the visible area VA and the non-contact area respectively. The position of the visible area NA is measured, and at the same position, the two chromaticity modes, the Specular component include (SCI) mode and the Specular component exclude (SCE) mode, are used respectively. The chromaticity value is detected, and its chromaticity value L, a, b is obtained. Among them, the chromaticity value L represents the brightness (the higher the value, the brighter the color is); the chromaticity value a represents the red-green degree (the higher the value, the more red (+) the color is, the lower the value, the more green the color is. (-)); the chromaticity value b represents the degree of yellow-blue (the higher the value, the more yellow (+) the color is, the lower the value, the more blue (-) the color is).

進行計算，而得到一△E值，該△E值表示該顯示模組在該可視區VA與該非可視區NA所呈現的顏色差異。 Then, according to the formula: △E=

The calculation is performed to obtain a ΔE value, and the ΔE value represents the color difference presented by the display module in the visible area VA and the non-visible area NA.

Table 1 SCI SCE viewable area L 9.86 2.20 a -1.3 -0.19 b -1.22 -0.91 non-visible area L 9.96 2.50 a -0.71 -0.17 b -0.84 -1.06 △E value 0.71 0.34

In this embodiment, the display module performs chromaticity value detection through the spectrophotometer in two different chromaticity modes (that is, the specular specular reflection mode is included, and the specular specular reflection mode is excluded). It is obtained that the ΔE values of the visible area VA and the non-visible area NA are both not greater than 2, and the visual effect of one black can be achieved, and it can be known from Table 1 that when the display unit 2 is not activated, the two areas are The color difference is very small (the ΔE values measured in the two chromaticity modes are all less than 1), and it is difficult to distinguish the visible area VA and the non-visual area NA by the naked eye, so the display module of this embodiment has a good One black visual effect.

To sum up, by disposing the linear polarizing film 31 on the display unit 2, and the included angle between the absorption axis of the linear polarizing film 31 and the absorption axis of the polarizing layer 22 adjacent to the display unit 2 is not greater than 45 degrees, So that the linear polarizing film 31 and the adjacent polarizing layer 22 can maintain good transmittance when the display unit 2 is activated, and when the display unit 2 is not activated, the visible area VA and the non-visual area NA The color difference is very small, and the visual effect of one black is achieved, so it can indeed achieve the purpose of this new model.

However, the above are only examples of the present invention, which should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application for this new model and the contents of the patent specification are still within the scope of the present invention. within the scope of this patent.

2: Display unit 21: Display layer 211: light-emitting side 22: polarizing layer 3: Shading unit 31: Linear polarizing film 32: shading layer 4: Anti-reflection unit 41: Protective layer 42: Anti-reflection layer 5: Joining unit 51: The first bonding layer 52: Second bonding layer VA: visible area NA: non-visible area A1: Absorption axis direction A2: Absorption axis direction I: included angle

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a schematic side view illustrating an embodiment of the display module of the present invention; and FIG. 2 is a schematic top view, The relative positions of the absorption axis of a polarizing layer and the absorption axis of a linear polarizing film of the novel display module are described.

2: Display unit

21: Display layer

211: light-emitting side

22: polarizing layer

3: Shading unit

31: Linear polarizing film

32: shading layer

4: Anti-reflection unit

41: Protective layer

42: Anti-reflection layer

5: Joining unit

51: The first bonding layer

52: Second bonding layer

VA: visible area

NA: non-visible area

Claims (7)

A display module, which distinguishes a visible area and a non-visual area, the display module includes: a display unit, located in the visible area, and comprising a display layer, and at least one polarizing layer disposed on the display layer, the display layer has a light-emitting side capable of displaying a picture, and the polarizing layer is disposed on the light-emitting side; and a light shielding unit, comprising a linear polarizing film at least disposed on the polarizing layer, and a light shielding layer disposed on the linear polarizing film and located in the non-visible area, the absorption axis of the linear polarizing film is the polarized light adjacent to the display unit The angle between the absorption axes of the layers is not more than 45 degrees. The display module of claim 1, wherein the linear polarizing film covers the visible area and the non-visible area, and covers the light shielding layer. The display module of claim 1, wherein the angle between the absorption axis of the linear polarizing film and the absorption axis of the polarizing layer adjacent to the display unit is 30 degrees to 45 degrees. The display module according to claim 1, wherein the linear polarizing film of the light-shielding unit and the polarizing layer adjacent to the display unit have a total transmittance to light of not less than 45%. The display module according to claim 1, further comprising an anti-reflection unit, the anti-reflection unit comprising a protective layer disposed on the side of the shading unit opposite to the display unit, and an anti-reflection layer disposed on the protective layer reflective layer. The display module according to claim 5, further comprising a bonding unit, the bonding unit comprising a first bonding layer for bonding the display unit and the light-shielding unit, and a first bonding layer for bonding the light-shielding unit and the light-shielding unit The second bonding layer of the anti-reflection unit. The display module according to claim 1, wherein the display unit comprises a display layer, and two polarizing layers respectively disposed on opposite sides of the display layer, and the absorption axis of the polarizing layers disposed on the light emitting side The included angle with the absorption axis of the linear polarizing film is not more than 45 degrees.

Images