High-efficiency rubber parts including rearector sheet and prism sheet

Abstract

The present invention relates to a high-efficiency backlight unit for a liquid crystal display (LCD) utilizing a light source, and comprises the following main components. A frame that maintains the structure of the backlight unit; a reflector sheet that improves efficiency by reflecting light generated from a light source; a light guide panel (LGP) that converts a point light source passing through the reflector sheet into a surface light source; a diffuser sheet that diffuses light emitted from the surface of the light guide panel to make the brightness uniform; a prism sheet that enhances brightness by refracting and concentrating the diffused light; a curtain tape that blocks light passing through the prism sheet from leaking out and ensures the LCD panel is securely fixed; and additionally, the curtain tape includes a hole that forms an air exhaust passage to discharge internal air of the backlight unit to the outside. This configuration maximizes the efficiency of the backlight unit and enables the supply of uniform, high-brightness light to the LCD panel.

Description

Technology Field

[0001] The present invention relates to a backlight unit (BLU) for a liquid crystal display device using a light source, and more specifically, to a structure of a backlight unit during an LCD module manufacturing process using an air zero gap bonding method. Background Technology

[0002] Recently, flat panel display devices such as Liquid Crystal Displays (LCDs), Plasma Display Panels (PDPs), and Organic Electroluminescence Displays (OLEDs) have become widely adopted and used, with the penetration rate of Liquid Crystal Displays being particularly prominent.

[0003] Figure 1 is a diagram showing the configuration of an LCM (LCD Module).

[0004] Referring to FIG. 1, the LCM comprises a polarizer (10), an LCD (20), an FPCB (FLEXIBLE PRINTED CIRCUITS BOARD) (30), and a BLU (Backlight Unit) (40).

[0005] The polarizing plate (10) performs the function of converting incident light, which vibrates in multiple directions, into light (polarized light) that vibrates in only one direction. The polarizing plate (10) can perform the polarization function by having one on each side of the LCD (20).

[0006] LCD (20) is a display device that displays images. In particular, a TFT LCD is a display device that controls the passage of light and displays images by injecting liquid crystal between a TFT glass and a color filter glass and changing the arrangement state of the liquid crystal by applying voltage.

[0007] The LCD (20) is equipped with an LCD driver IC. The LCD driver IC is a device that controls the voltage and screen so that the LCD can be driven through a communication interface with the CPU chip.

[0008] The FPCB (30) is a board for mounting driving circuit patterns and components.

[0009] BLU (40) uses a side view white LED light source and serves to supply light to the LCD (20) through various sheets.

[0010] Due to the recent trend toward thinner and higher transmittance display devices, liquid crystal displays are widely used in mobile phones, smartphones, laptops, PDAs, and tablet PCs.

[0011] As such, in response to the demand for thinning and high transmittance, air zero gap bonding, a method of assembling the Touch Screen Module (TSM) and the LCD Module (LCM) in the manufacturing process of liquid crystal displays, is widely used.

[0012] In conventional LCDs, an air gap is created in the touch screen panel to minimize LCD noise, but the air zero gap bonding method is a technology that lowers power consumption by improving light transmittance, brightness, and C / R values ​​through processing the air gap area by bonding the LCD and the touch screen panel using OCA (Optical Clear Adhesive).

[0013] Figure 2 is a structural diagram illustrating the air zero gap bonding method during the display module manufacturing process.

[0014] Referring to FIG. 2, the air zero gap bonding method is a method of bonding LCM (100) and TSM (200) using an adhesive (Adhesive) (300).

[0015] The LCM (100) is mainly composed of a panel (110) and a BLU (120), and the TSM (200) is composed of a window glass (210) and a sensor (220).

[0016] Figure 3 is a diagram illustrating a stacked structure using an air zero-gap bonding method during the display module manufacturing process.

[0017] Referring to FIG. 3, the panel (110) includes an upper polarizer (Upper Pol) (111), a color filter glass (112), a liquid crystal (113), a TFT glass (114), and a lower polarizer (Down Pol) (115).

[0018] BLU (120) includes a curtain tape (121), a prism sheet (122, 123), a diffuser sheet (124), an LGP (125), a reflector sheet (126), and a frame (127).

[0019] The TSM (200) comprises a window glass (210), an ITO film or glass (222), and an adhesive (224) for bonding the window glass (210) and the ITO film or glass (222).

[0020] Figure 4 is a drawing showing the internal configuration of the LCM.

[0021] The LCM (100) consists of a panel (110) and a BLU (120).

[0022] The panel (110) includes an upper polarizer (Upper Pol) (111), a color filter glass (112), a liquid crystal (113), a TFT glass (114), and a lower polarizer (Down Pol) (115).

[0023] The upper polarizer (111) serves to apply the flow of light in a constant direction by being orthogonal to the lower polarizer (115).

[0024] The color filter glass (112) serves to express the transmitted light of the liquid crystal (113) as R, G, and B colors.

[0025] The liquid crystal (113) transmits or blocks light depending on the voltage applied to the TFT glass (114).

[0026] The TFT glass (114) applies a gate voltage that matches the input image.

[0027] The lower polarizer (115) serves to apply the flow of light in a constant direction at an angle to the upper polarizer (111).

[0028] BLU (120) includes a curtain tape (121), a prism sheet (122, 123), a diffuser sheet (124), an LGP (125), a reflector sheet (126), and a frame (127).

[0029] The curtain tape (121) prevents light leakage and serves to secure the panel (110).

[0030] The prism sheet (122, 123) refracts and concentrates the light diffused from the diffuser sheet (124) to improve brightness.

[0031] The diffuser sheet (124) serves to equalize the brightness by scattering light coming from the LGP surface.

[0032] LGP (125) plays the role of converting point light source LEDs into surface light sources.

[0033] The reflector sheet (126) serves to improve light efficiency by reflecting light emitted from a light source.

[0034] The frame (127) serves to maintain the basic shape of the BLU (120).

[0035] Above, the manufacturing process of the air zero gap bonding method among the manufacturing processes of conventional display devices has been described.

[0036] As such, the air zero gap bonding method is widely used because it has the advantage of making the display module thin and achieving high transmittance, but there are the following problems with the BLU (120).

[0037] Figure 5 is a partial cross-sectional view of a conventional BLU (Backlight Unit).

[0038] Referring to FIG. 5, the conventional BLU (120) has a structure in which a curtain tape (121) and a prism sheet (122) are bonded together. Thus, the curtain tape (121) blocks the open area. Under this structure, there is a problem in that internal air is not discharged from the vacuum chamber because there is no internal air pass hole.

[0039] As a result, since the internal air is not properly discharged in the conventional BLU (120), the BLU (120) swells up due to the pressure difference and separates from the panel (110).

[0040] To prevent this separation phenomenon, conventional display module manufacturing processes have used a method of holding the module using a hook on a jig. However, this method of using jig hooks has the problem of causing additional defects and reducing production efficiency. The problem to be solved

[0041] The present invention was devised to solve the above-mentioned problems, and aims to provide a technology that can prevent the backlight unit (BLU) from swelling during the Air Zero Gap Bonding process in the display module manufacturing process.

[0042] The objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0043] To achieve the above purpose, the backlight unit of the present invention comprises a frame for maintaining the shape of the backlight unit, a reflector sheet for reflecting light emitted from a light source to improve light efficiency, a Light Guide Panel (LGP) for converting a point light source passing through the reflector sheet into a surface light source, a diffuser sheet for scattering light emitted from the surface of the LGP to equalize light brightness, a prism sheet for refracting and concentrating light diffused from the diffuser sheet to improve brightness, and a curtain tape which is a tape that prevents light leakage, a phenomenon in which light emitted through the prism sheet leaks out, and allows an LCD (Liquid Crystal Display) panel to be mounted, wherein a hole for an air pass to discharge internal air of the backlight unit to the outside is formed in a part of the curtain tape.

[0044] The above hole may be formed in the area where the internal space of the backlight unit inside the curtain tape and the outside are connected.

[0045] The above curtain tape can be formed on the edge portion of the backlight unit.

[0046] In the above curtain tape, it is preferable to form the hole in a portion that does not cause light leakage defects of the backlight unit.

[0047] The above prism sheet can be formed in two layers.

[0048] An LCD module according to one embodiment of the present invention includes a Liquid Crystal Display (LCD) panel and a backlight unit comprising a curtain tape for providing light to the back of the LCD panel and for mounting the LCD panel, wherein a hole for an air pass for discharging internal air of the backlight unit to the outside is formed in a part of the curtain tape.

[0049] The above backlight unit may comprise a frame for maintaining the shape of the backlight unit, a reflector sheet for reflecting light emitted from a light source to improve light efficiency, a Light Guide Panel (LGP) for converting a point light source passing through the reflector sheet into a surface light source, a diffuser sheet for scattering light emitted from the surface of the LGP to equalize light brightness, a prism sheet for refracting and concentrating light diffused from the diffuser sheet to improve brightness, and a curtain tape which is a tape that prevents light leakage, a phenomenon in which light emitted through the prism sheet leaks out, and allows the LCD (Liquid Crystal Display) panel to be mounted.

[0050] The above hole may be formed in the area where the internal space of the backlight unit inside the curtain tape and the outside are connected.

[0051] The above curtain tape can be formed on the edge portion of the backlight unit.

[0052] In the above curtain tape, the hole can be formed in a portion that does not cause light leakage defects of the backlight unit.

[0053] The above prism sheet can be formed in two layers.

[0054] In one embodiment of the present invention, the LCD module can be combined with a touch screen module using an air zero gap bonding method. Effects of the invention

[0055] According to the present invention, there is an effect of preventing swelling of the backlight unit (BLU) during the air zero gap bonding process.

[0056] In addition, according to the present invention, since a hook is not required on the jig, it is possible to prevent a decrease in production efficiency caused by the process of attaching a display module including a BLU to the hook, and to improve work defects caused by hook interference. Accordingly, the overall yield can be improved during the air zero gap bonding process. Brief explanation of the drawing

[0057] Figure 1 is a diagram showing the configuration of an LCM (LCD Module). Figure 2 is a structural diagram illustrating the air zero gap bonding method during the display module manufacturing process. Figure 3 is a diagram illustrating a stacked structure using an air zero-gap bonding method during the display module manufacturing process. Figure 4 is a drawing showing the internal configuration of the LCM. Figure 5 is a partial cross-sectional view of a conventional BLU (Backlight Unit). FIG. 6 is a partial cross-sectional view of a BLU according to one embodiment of the present invention. FIG. 7 is a top view of a BLU according to one embodiment of the present invention. Specific details for implementing the invention

[0058] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. First, it should be noted that in assigning reference numerals to the components of each drawing, identical components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the invention, such detailed description is omitted. Additionally, throughout the specification, when a part is described as "including" a certain component, this does not specifically mean otherwise.

[0059] This means that, unless otherwise noted, it does not exclude other components but may include additional components.

[0060] FIG. 6 is a partial cross-sectional view of a BLU according to one embodiment of the present invention.

[0061] Referring to FIG. 6, the BLU of the present invention comprises a curtain tape (121), a prism sheet (122, 123), a diffuser sheet (124), an LGP (125), a reflector sheet (not shown), and a frame (127).

[0062] Includes.

[0063] The curtain tape (121) prevents light leakage and serves to secure the panel (110).

[0064] The prism sheets (122, 123) serve to improve brightness by refracting and concentrating light diffused from the diffuser sheet (124). In one embodiment of the present invention, it is preferable that the prism sheets be formed in two layers. That is, they are formed as an upper prism sheet (122) and a lower prism sheet (123).

[0065] The diffuser sheet (124) serves to equalize the brightness by scattering light coming from the LGP surface.

[0066] The LGP (Light Guide Panel) (125) serves to convert point light source LEDs into surface light sources.

[0067] The reflector sheet (not shown) serves to improve light efficiency by reflecting light emitted from a light source.

[0068] The frame (127) serves to maintain the basic shape of the BLU (120).

[0069] In the present invention, a hole for an air pass is formed in the area where the lower space of the curtain tape (121) is connected to the outside.

[0070] In the present invention, a hole may be formed in the area where the inner space of the backlight unit inside the curtain tape (121) and the outside are connected.

[0071] FIG. 7 is a top view of a BLU according to one embodiment of the present invention.

[0072] Referring to FIG. 7, the BLU (120) has six holes (H) formed on its side for air passages. In FIG. 6, an enlarged view of one of the six holes (H) is shown inside a circle.

[0073] In the embodiment of FIG. 7, holes (H) for air passages are formed in six locations that do not cause light leakage defects of the BLU (120) in the present invention. Specifically, two holes (H) are formed at the upper corners, and two holes (H) are formed at the left corners.

[0074] Two holes (H) are formed at the right corner, resulting in a total of six holes (H). However, this is merely one embodiment, and

[0075] It is obvious that holes can be formed in various locations to prevent light leakage defects in the BLU (120).

[0076] In one embodiment of the present invention, the curtain tape (121) may be formed on the edge portion of the backlight unit.

[0077] And, in the curtain tape (121), it is preferable to form a hole (H) in a part that does not cause light leakage defects of the backlight unit (120).

[0078] In the present invention, the LCD module (LCD module, LCM) includes a Liquid Crystal Display (LCD) panel and a backlight unit (120) that provides light to the back of the LCD panel and includes a curtain tape for mounting the LCD panel.

[0079] In the present invention, a hole for an air pass for discharging internal air of the backlight unit (120) to the outside is formed in a part of the curtain tape (121).

[0080] As described above, in the present invention, a hole for an air pass is formed in the curtain tape (121) portion of the BLU (120). Accordingly, according to the present invention, swelling of the BLU (120) can be prevented during the air zero gap bonding process.

[0081] Accordingly, since a hook is not required on the jig, it is possible to prevent a decrease in production efficiency caused by the process of attaching a display module including a BLU to the hook, and to improve work defects caused by hook interference. In addition, according to the present invention, the overall yield can be improved during the air zero gap bonding process.

[0082] Although the present invention has been described above using several preferred embodiments, these embodiments are illustrative and not limiting. Those skilled in the art will understand that various changes and modifications can be made without departing from the spirit of the invention and the scope of the rights set forth in the appended claims. Explanation of the symbols

[0083] 100 LCM 300 adhesive 120 BLU 220 sensor 200 TSM 110 panels 210 Window Glass 222 ITO film or glass 111 Upper polarizer 112 Color Filter Glass 113 LCD 114 TFT Glass 115 Lower polarizer 121 Curtain Tape 122 Upper Prism Sheet 123 Lower Prism Seat 124 Diffuser Seat 125 LGP 126 Reflector Sheet 127 BLU Frame

Claims

Claim 1 A backlight unit comprising: a frame for maintaining the shape of the backlight unit; a reflector sheet for reflecting light emitted from a light source to improve light efficiency; a Light Guide Panel (LGP) for converting a point light source passing through the reflector sheet into a surface light source; a diffuser sheet for scattering light emitted from the surface of the LGP to equalize light brightness; a prism sheet for refracting and concentrating light diffused from the diffuser sheet to improve brightness; and a curtain tape which is a tape that prevents light leakage, a phenomenon in which light emitted through the prism sheet leaks out, and allows an LCD (Liquid Crystal Display) panel to be mounted, wherein a hole for an air pass to discharge internal air of the backlight unit to the outside is formed in a part of the curtain tape.

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