TWI881721B - Display frame module - Google Patents

Abstract

A display frame module is used to set up an optical display structure with a liquid crystal unit, including a backplane unit and a frame unit. The backplane unit includes a carrier plate made of a resin material, and an optical reflective coating layer and a conductive ink coating layer formed on two opposite sides of the carrier plate. The frame unit is used to frame the backplane unit, including a side frame and a bottom frame connected to the side frame and defining an opening. The side frame has a supporting platform for placing the liquid crystal unit, and the backplane unit is set on the bottom frame and closes the opening. The structural design of the backplane unit enables the display frame module to have good electromagnetic shielding, electrostatic discharge effect and optical reflectivity without the need for a metal backplane and a reflective sheet, which is beneficial to the thinning of the display frame module and is suitable for displays with narrow frame designs.

Description

Display frame module

The present invention relates to a frame module, and in particular to a display frame module suitable for an optical display.

Generally speaking, the overall thickness of a display is usually determined by the thickness of a display frame for placing an optical display structure. Therefore, how to reduce the thickness of the display frame to make the display lighter and thinner is one of the problems that the relevant industry is eager to improve.

Referring to FIG. 1 , a conventional display frame generally comprises a metal back plate 11, a support frame 12 disposed on the top edge of the metal back plate 11 and used to support a liquid crystal unit 101 of the optical display structure 100, and a reflective sheet 13 disposed on the metal back plate 11 and located below the liquid crystal unit 101. The metal back plate 11 made of metal material can provide sufficient mechanical support to support the optical display structure 100, and can also make the display frame have good electromagnetic shielding and electrostatic discharge effects. However, due to the weight and material properties of the metal material itself, the display frame has its limit in reducing thickness and weight, which is not conducive to the thinning and lightening of the display. In addition, since the metal back plate 11 is relatively hard, it will pull the liquid crystal unit 101 to cause strain, which may easily cause the liquid crystal unit 101 to break or the optical display structure 100 to have uneven color display. In addition, there is a problem of large difference in thermal expansion coefficient between the metal back plate 11 and the plastic reflector 13 and the support frame 12. Therefore, a buffering spacing distance (for example, 3.78 mm) is usually required between the support frame 12 and the liquid crystal unit 101, making the display less flexible in terms of narrow frame design.

Therefore, the purpose of the present invention is to provide a display frame module that is suitable for being configured in a display and is beneficial to the thinning and lightening of the display, and is more suitable for narrow frame design.

Therefore, the display frame module of the present invention is used to set up an optical display structure with a liquid crystal unit. The display frame module includes a backplane unit and a frame unit.

The backplane unit includes a carrier plate made of resin material and having an inner surface and an outer surface opposite to each other, an optical reflective coating formed on the inner surface, and a conductive ink coating formed on the outer surface.

The frame unit is used to frame the backplane unit and is made of resin material. The frame unit includes a side frame and a bottom frame connected to a bottom edge of the side frame and defining an opening. The backplane unit is arranged on the bottom frame and closes the opening, and together with the frame unit defines a containing space for arranging the optical display structure, and the backplane unit is arranged in a direction where the optical reflective coating faces the containing space. The side frame has a supporting platform extending downward from a top edge of the side frame and used to place the liquid crystal unit.

The effect of the present invention is that: through the structural design of the backplane unit, the metal backplane and reflective sheet configured in the existing display frame can be omitted, and it can also have sufficiently good electromagnetic shielding, electrostatic discharge effect and optical reflectivity, thereby reducing the thickness and weight of the display frame module. Moreover, since there is no need to consider the difference in thermal expansion coefficient between the reflective sheet and the metal backplane, it is also helpful to design a narrow frame for the display. In addition, the supporting plate made of resin material is a soft structure, which can prevent the liquid crystal unit arranged in the display frame module from being pulled and strained.

Before the present invention is described in detail, it should be noted that similar components are represented by the same number in the following description. In addition, it should be noted that the drawings of the present invention are only for representing the relative relationship of the structure and/or position between components, and are not related to the actual size of each component.

Referring to FIG. 2 , an embodiment of a display frame module 200 of the present invention is suitable for use as a support frame to be configured in a display (not shown). The display frame module 200 is used to set up an optical display structure 100, and the optical display structure 100 has a functional layer unit 102 and a liquid crystal unit 101. Among them, the functional layer unit 102 is formed by stacking a variety of different functional optical layers, and each functional optical layer can be selected from a delay wave plate, a transparent conductive film or a polarizing film according to different product requirements, but is not limited to the aforementioned examples. It should be noted that the detailed structure of the optical display structure 100 or other commonly used components configured in the display, such as a light source, a driving circuit board or a metal heat sink, etc. are already known in the relevant field and will not be elaborated here.

The display frame module 200 includes a back panel unit 2 and a frame unit 3 made of resin material.

The back panel unit 2 includes a carrier plate 21 having an inner surface 211 and an outer surface 212 opposite to each other, an optical reflective coating 22 formed on the inner surface 211, and a conductive ink coating 23 formed on the outer surface 212. Preferably, the thickness of the back panel unit 2 is less than 0.6 mm.

The support plate 21 is made of a resin material and has good flexibility, so that the liquid crystal unit 101 disposed in the display frame module 200 can be prevented from being pulled and strained, thereby reducing the probability of the liquid crystal unit 101 being broken or the color unevenness of the optical display structure 100. The resin material is selected from polycarbonate (PC), polymethyl methacrylate (PMMA), or polymethyl methacrylate-styrene (MS).

In other embodiments, the interior of the carrier plate 21 is further doped with metal fibers or metal particles to enhance the mechanical strength of the carrier plate 21.

The surface resistance of the conductive ink coating 23 is not greater than 10 ohms, so that the backplane unit 2 has electromagnetic shielding against electromagnetic interference (EMI) and electrostatic discharge (EDS) effect. In this embodiment, the conductive ink coating 23 is illustrated as a mixture of a colloid and a plurality of metal powders, but the invention is not limited thereto. In some embodiments, the conductive ink coating 23 can also be a mixture of the colloid, the metal powders, and a carbon material.

The reflectivity of the optical reflective coating 22 is between 93% and 95%, and is used to reflect the light leaking from the liquid crystal unit 101 back to the optical display structure 100. In this embodiment, the optical reflective coating 22 has a substrate and a plurality of reflective particles dispersed on the substrate. The substrate is selected from polycarbonate or polymethyl methacrylate (PMMA), and the reflective particles are selected from at least one of titanium dioxide and barium sulfate.

The display frame module 200 utilizes the structural design of the back panel unit 2, which can omit the metal back panel 11 and the reflective sheet 13 configured in the existing display frame (see FIG. 1), thereby contributing to the thinning and lightening of the display frame module 200, and making the back panel unit 2 still have good electromagnetic shielding, electrostatic discharge effect and optical reflection properties. In addition, since the carrier plate 21 is a soft structure, it is less likely to cause the liquid crystal unit 101 disposed in the display frame module 200 to be pulled and strained, thereby avoiding the problem of the liquid crystal unit 101 being broken or the optical display structure 100 having uneven color display.

The frame unit 3 is used to frame the back panel unit 2 and provide support for the back panel unit 2 and the optical display structure 100. The frame unit 3 includes a side frame 31 and a bottom frame 32 connected to a bottom edge of the side frame 31 and defining an opening 321. The back panel unit 2 is arranged on the bottom frame 32 and closes the opening 321, and together with the frame unit 3 defines a receiving space 4 for arranging the optical display structure 100, and the back panel unit 2 is arranged in a direction where the optical reflective coating 22 faces the receiving space 4. The side frame 31 has a supporting platform 311 extending downward from a top edge of the side frame 31 and used to place the liquid crystal unit 101.

In this embodiment, the bottom frame 32 is extended from the bottom edge of the side frame 31 toward the center of the frame unit 3 as shown in FIG. 2 to support the backplane unit 2, which is disposed on one side of the bottom frame 32 adjacent to the accommodating space 4. Since the carrier plate 21 of the display frame module 200 is selected from a resin material and the optical reflective coating 22 replaces the existing reflective sheet, it is not necessary to consider the difference in thermal expansion coefficient between the metal backplane 11 and the reflective sheet 13 as in the existing display frame (see FIG. 1), and it is necessary to reserve a sufficient spacing distance between the support frame 12 and the liquid crystal unit 101 as a buffer. Therefore, the distance d1 between the liquid crystal unit 101 and an inner wall 312 of the side frame 31 of the present embodiment can be controlled to be less than 0.33 mm, and the distance d2 between the liquid crystal unit 101 and an outer wall 313 of the side frame 31 can be controlled to be less than 3.7 mm, which is helpful for designing the display with a narrow frame.

Preferably, the distance d1 between the liquid crystal unit 101 and the inner wall surface 312 is 0.3 mm, and the distance d2 between the liquid crystal unit 101 and the outer wall surface 313 is 3.1 mm.

Referring to FIG. 3 , another embodiment of the display frame module 200 of the present invention is shown. In this embodiment, the side frame 31 of the frame unit 3 and a bottom surface of the bottom frame 32 jointly define a supporting platform 33 , and the back panel unit 2 is fixedly mounted on the supporting platform 33 .

The back panel unit 2 of the display frame module 200 of the present invention is subjected to an electromagnetic compatibility test and an optical property test to examine the electromagnetic shielding test and surface optical properties of the back panel unit 2. The carrier plate 21 of the back panel unit 2 is selected from polycarbonate (PC). However, it should be understood that the test data described below is only for illustrative purposes and should not be interpreted as a limitation of the implementation of the present invention.

Electromagnetic compatibility test

The electromagnetic compatibility test is performed using an EMI test receiver (manufacturer: Rohde & Schwarz, model: ESW8) to test the conductive ink coating 23 of the backplane unit 2 and a plastic plate as a control group 1 and made of the same material as the carrier plate 21, to obtain the test results of the backplane unit 2 and the plastic plate, and the test results of the electromagnetic compatibility test are shown in Figures 4 to 7. The electromagnetic compatibility test is performed in accordance with the "Electromagnetic Compatibility" test standard revised by the Bureau of Standards, Metrology and Inspection, Ministry of Economic Affairs (Standard No.: CNS15936, Product Test Standard: EN55032).

FIG4 and FIG5 are radiation emission test diagrams of vertical test waveforms of the plastic plate and the back plate unit 2, respectively. FIG6 and FIG7 are radiation emission test diagrams of horizontal test waveforms of the plastic plate and the back plate unit 2, respectively. A dashed line shown in each of FIG4 to FIG7 is an average value of the radiation emission peak value, and a solid line shown in each of FIG4 to FIG7 is a boundary value of the radiation emission peak value. It can be seen from FIG. 4 and FIG. 6 that the plastic board has 20 peaks (marked with x in FIG. 4 ) in the radiation emission test diagram of the vertical test waveform that exceed the average value, of which 6 exceed the boundary value, and 14 peaks (marked with x in FIG. 6 ) in the radiation emission test diagram of the horizontal test waveform that exceed the average value, of which 7 exceed the boundary value, which shows that the plastic board does not meet the inspection standard of the electromagnetic compatibility test. As can be seen from FIG. 5 and FIG. 7, the backplane unit 2 has 4 peaks (marked with x in FIG. 5) in the radiation test diagram of the vertical test waveform that exceed the average value, of which only one is close to but does not exceed the boundary value, and 8 peaks (marked with x in FIG. 7) in the radiation test diagram of the horizontal test waveform that exceed the average value, and no peak exceeds the boundary value. It can be seen that the backplane unit 2 meets the inspection standard of the electromagnetic compatibility test and has good electromagnetic shielding, which can effectively suppress electromagnetic interference (EMI noise).

Optical property test

The optical property test utilizes a spectrophotometer (manufacturer TOPCON, model number SR-3AR) to detect any area of the optical reflective coating 22 of the backplane unit 2 and a reflector serving as a control group 2, so as to obtain the luminance value (luminance, L) and chromaticity value (x, y) of the optical reflective coating 22 and the reflector, and the test results are summarized in Table 1.

Table 1 Brightness value (L) Proportion(%) Chromaticity value (x) Chromaticity value (y) Optical reflective coating 422.04 100% 0.3007 0.3196 Reflective sheet 400.50 94.9% 0.3002 0.3195

From Table 1, it can be seen that the difference in luminance between the optical reflective coating 22 and the reflective sheet is less than 6%, and the difference in chromaticity is no greater than 0.0005. Therefore, it can be seen that the optical reflective coating 22 of the back panel unit 2 has similar color characteristics and surface optical properties as the reflective sheet, so the back panel unit 2 can still have good optical reflectivity even if the reflective sheet is not provided.

In summary, the display frame module 200 of the present invention utilizes the structural design of the back panel unit 2, and can have sufficiently good electromagnetic shielding, electrostatic discharge effect and optical reflectivity without configuring the metal back panel 11 and the reflective sheet 13, thereby reducing the thickness and weight of the display frame module 200, and is conducive to the thinning and lightening of the display. In addition, since the supporting plate 21 is made of resin material, in addition to preventing the liquid crystal unit 101 arranged in the display frame module 200 from being pulled and strained, there is no need to consider the difference in thermal expansion coefficient between the supporting plate 21 and the frame unit 3 or the optical reflective coating 22, which helps the narrow frame design of the display, so the purpose of the present invention can be achieved.

However, the above is only an embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still within the scope of the present patent.

100                Optical display structure 101                  Liquid crystal unit 102                  Functional layer unit 11                  Metal backplane 12                  Support frame 13                  Reflective sheet 200                Display frame module 2                    Backplane unit 21                  Carrier plate 211                Inner surface 212                Outer surface 22                  Optical reflective coating 23                  Conductive ink coating 3                    Frame unit 31                  Side frame 311                  Support platform 312                  Inner wall 313                External wall 32                  Bottom frame 321                Opening 33                  Loading platform 4                    Accommodation space d1, d2            Spacing distance

Other features and effects of the present invention will be clearly presented in the implementation method of the reference drawings, in which: Figure 1 is a side view and a cross-sectional view, illustrating an existing display frame; Figure 2 is a side view and a cross-sectional view, illustrating an implementation example of the display frame module of the present invention; Figure 3 is a side view and a cross-sectional view, illustrating another implementation state of the display frame module; Figures 4 and 6 are radiation emission test diagrams, used to represent the test results of the electromagnetic compatibility test of a plastic board; and Figures 5 and 7 are radiation emission test diagrams, used to represent the test results of the electromagnetic compatibility test of a back panel unit of the display frame module.

100:Optical display structure

101: Liquid crystal unit

102: Functional layer unit

200: Display frame module

2: Back panel unit

21: Carrier plate

211: Inner surface

212: External surface

22: Optical reflective coating

23: Conductive ink coating

3: Frame unit

31: Side frame

311: Support platform

312: Inner wall

313: Outer wall

32: Bottom frame

321: Open your mouth

4: Storage space

d1, d2: spacing distance

Claims (7)

A display frame module is used to set up an optical display structure with a liquid crystal unit, and the display frame module includes: A backplane unit, including a carrier plate made of a resin material and having an inner surface and an outer surface opposite to each other, an optical reflective coating formed on the inner surface, and a conductive ink coating formed on the outer surface; and A frame unit is used to frame the back panel unit and is made of resin material. The frame unit includes a side frame and a bottom frame connected to a bottom edge of the side frame and defining an opening. The back panel unit is arranged on the bottom frame and closes the opening, and together with the frame unit, defines a containing space for arranging the optical display structure. The back panel unit is arranged with the optical reflective coating facing the containing space. The side frame has a supporting platform extending downward from a top edge of the side frame and used to place the liquid crystal unit. The spacing distance between the liquid crystal unit and an inner wall surface of the side frame is less than 0.33 mm, and the spacing distance between the liquid crystal unit and an outer wall surface of the side frame is less than 3.7 mm. As described in claim 1, the bottom frame extends from the bottom edge of the side frame toward the center, and the back panel unit is arranged on a side of the bottom frame adjacent to the accommodating space. A display frame module as described in claim 1, wherein a bottom surface of the bottom frame and the side frame together define a supporting platform, and the supporting platform is used to set the back panel unit. A display frame module as described in claim 1, wherein the resin material of the supporting plate is selected from polycarbonate, polymethyl methacrylate, or polymethyl methacrylate-styrene. A display frame module as described in claim 4, wherein the interior of the carrier plate is also doped with metal fibers or metal particles. A display frame module as described in claim 1, wherein the surface resistance of the conductive ink coating is no greater than 10 ohms. A display frame module as described in claim 1, wherein the optical reflective coating has a substrate and a plurality of reflective particles dispersed on the substrate, the substrate is selected from polycarbonate or polymethyl methacrylate, the reflective particles are selected from at least one of titanium dioxide and barium sulfate, and the reflectivity of the optical reflective coating is between 93% and 95%.

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