KR102227016B1 - Display Device - Google Patents

Abstract

The present invention relates to a display device, in which side structures such as a cover bottom and a guide panel for supporting a display panel are short and simply modified, so that a 5-hole COF By enabling the full-folding mounting of the source PCB using the device, the length of the COF can be reduced without increasing the thickness of the display panel, and ultimately, the cost of reducing the length of the COF without increasing the thickness of the display panel or changing the mounting structure of the source PCB It can have an effect of saving and reducing signal transmission errors.

Description

Display Device

The present invention relates to a display device, more specifically, to a display device having a structure capable of mounting a chip-on-film (COF) having a short length in a full-folding manner.

As the information society develops, demands for display devices for displaying images are increasing in various forms, and in recent years, liquid crystal displays (LCDs), plasma display panels (PDPs), organic electric fields Various display devices such as an OLED (Organic Light Emitting Diode Display Device) are being used.

Among these display devices, a liquid crystal display (LCD) includes an array substrate including a thin film transistor, which is a switching element for controlling on/off of each pixel region, and a color filter and/or a black matrix. It is composed of a display panel including an upper substrate and a liquid crystal material layer formed therebetween, a driving unit for controlling the thin film transistor, and a backlight unit (BLU) that provides light to the display panel. , The arrangement state of the liquid crystal layer is adjusted according to the electric field applied between the pixel (PXL) electrode and the common voltage (Vcom) electrode provided in the pixel area, and the transmittance of light is adjusted accordingly to display an image.

In the case of such a liquid crystal display device, there must be a backlight device that provides light from the outside, and such a backlight unit may include subunits such as a light source, a light guide plate, a reflective plate, and an upper sheet, and supports for mounting these subunits. It includes one or more frames or chassis as structures.

Such a frame or chassis includes a cover bottom, which is a plate-shaped member supporting some of the side and rear portions of the backlight unit, and a guide panel that is provided in relation to the cover bottom and supports between the backlight unit and the display panel. Or, a guide sheet or the like is used. In general, the cover bottom is made of a metal material and the guide panel is made of a plastic material, but is not limited thereto.

In addition, since the cover bottom and the guide panel are interlocked with each other and are formed to extend from the side of the display device to a part of the front surface of the display panel, a case top may be used as a frame for protecting the display panel.

In addition, a liquid crystal module (LCM), which is an example of such a display device, requires a data driving circuit for driving the display panel.

Among these data driving circuits, the source printed circuit board (S-PCB) is usually disposed on the rear or side of the display panel, and in order to connect the source PCB to the display panel on the front side, a flexible printed circuit member (Flexible PCB) is used. Chip on Film (hereinafter referred to as'COF') is used.

The COF is a flexible circuit device having a certain width, and one or more signal wiring patterns or circuit devices are mounted therein, and one end is connected to the source PCB of the display panel and the other end is connected to the signal terminal of the display panel.

The length of this COF can be expressed as the number of holes formed on the side of the COF film, and is usually 2 of a long COF having a length corresponding to 7 holes and a short COF having a length corresponding to 5 holes. Branch types are used, and for convenience, long COFs are also expressed as 7-hole COFs and short COFs as 5-hole COFs.

Meanwhile, in the case of a 7-hole COF, since the length of the COF is relatively long, the source PCB can be mounted on the rear side of the display panel and mounted in a so-called full-folding type in which the COF is completely bent and extended to the front side.

On the other hand, since the length of the 5-hole COF is relatively short, there is a limit to the length of the full-folding method in which the source PCB is completely placed on the rear side. It could be mounted in a so-called half-folding method that is bent and connected to the display panel.

As described above, in the full-folding method, only relatively long COFs can be used, but if only design problems can be solved, the shorter the COF in terms of electrical characteristics or cost, the more advantageous performance can be secured.

However, when the support structure of the existing display panel, particularly the structure of the cover bottom or the guide panel, is used as it is, there is a limitation in mounting a 5-hole COF having a short length on the display panel in a full-folding manner.

Against this background, it is an object of the present invention to provide a display panel or display device that allows a short 5-hole COF to be fully folded in a display device.

Another object of the present invention is to provide a display device capable of mounting a short 5-hole COF in a full-folding manner by optimizing structures of a cover bottom and a guide panel, which are support structures of a display panel.

Another object of the present invention is to form an optical sheet hanger part of the backlight unit bent in some of the cutout areas for passing through the COF formed on the cover bottom, which is the support structure of the display panel, and the support area other than the cutout area for passing the COF, opposite to the sheet hooking part. A display device capable of mounting a short 5-hole COF in a full-folding manner by forming a reinforcing rib that is bent in a direction is provided.

Another object of the present invention is to mount a short 5-hole COF in a manner close to full folding by optimizing the structures of the cover bottom and the guide panel, which are the supporting structures of the display panel, but the angle between the source PCB mounting surface and the display device normal is It is aimed at 55 to 65 degrees.

In order to achieve the above object, an embodiment of the present invention is a source printed circuit board including a display panel, a backlight unit including a light source module, a light guide plate, and an optical sheet, and a driving circuit for driving the display panel ( PCB), and a cut-out area for passing through a COF through which a chip-on-film (COF) for supporting at least one of the display panel and the backlight unit and connecting the source PCB to the display panel passes, and passes the COF A display device including a cover bottom having a sheet hook portion bent toward the front side and inserted into a through hole of an optical sheet of the backlight unit, and a guide panel connected to the cover bottom are provided in at least one of the cut areas.

According to an embodiment of the present invention, by changing the structure of the cover bottom supporting the display panel and the guide panel, even a relatively short COF (5-hole COF) can be made close to full-folding. It has the effect of being able to mount the source PCB.

In addition, by short and simple deformation of the side structures such as the cover bottom and the guide panel, it is possible to mount the full-folding of the source PCB using a 5-hole COF without affecting the support or bonding force to the display panel. , There is an effect of reducing the length of the COF without increasing the thickness of the display panel.

Therefore, ultimately, cost reduction and signal transmission error reduction effects can be achieved by reducing the length of the COF without increasing the thickness of the display panel or changing the mounting structure of the source PCB.

1 is a cross-sectional view of a conventional display device.
2 is a cross-sectional view schematically showing two source-PCB mounting methods.
3 is a detailed cross-sectional view of a full-folding source-PCB display device using a typical 7-hole COF.
4 is a plan view, an enlarged perspective view, and an enlarged cross-sectional view of a cover bottom used in an embodiment of the present invention.
5 is an enlarged perspective view of a guide panel used in an embodiment of the present invention, showing structures viewed from the front and the rear.
6 is a side cross-sectional view of a display device equipped with a 5-hole COF according to an exemplary embodiment of the present invention, and is a cross-sectional view of a cut-out area for penetrating a COF of a cover bottom.
FIG. 7 is a side cross-sectional view of a display device equipped with a 5-hole COF according to an exemplary embodiment of the present invention, and is a cross-sectional view of a support area of the cover bottom (a portion other than the cut-out area for passing through the COF).
8 is a diagram illustrating a state in which a source PCB is mounted according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to elements of each drawing, the same elements may have the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, the detailed description may be omitted.

In addition, in describing the constituent elements of the present invention, terms such as first, second, A, B, (a) and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, order, or number of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected or connected to that other component, but other components between each component It should be understood that "interposed" or that each component may be "connected", "coupled" or "connected" through other components.

1 is a cross-sectional view of a conventional display device to which the present invention can be applied.

1, a display device to which an embodiment of the present invention can be applied includes a display panel 160 such as a liquid crystal display panel and a backlight unit 130 disposed under the display panel to irradiate light to the display panel, and the backlight unit It includes a cover bottom 120 made of a metal or plastic material that supports the 130 and extends over the entire rear surface of the display device.

In addition, a guide panel 140 made of a plastic material, which is a structure that is fixed to the cover bottom and connects the backlight unit 130 and the display panel 160, may be additionally provided. A double-sided tape is attached to a portion of the upper surface of the guide panel 140 and the display panel 160 is disposed thereon, so that the display panel may be fixedly mounted.

In addition, the display device 100 further includes a case top 110 that covers the outermost cover bottom and the side portion of the guide panel to be bent and extended to a part of the front surface of the display panel to protect the front edge of the display panel. Can be included.

The case top 110 surrounds a side portion of the display device and extends to a partial area of the front portion of the display panel 160 to protect the display panel and at the same time, a printed circuit board for driving a display device disposed behind the cover bottom ( A function of protecting a chip-on-film (COF) circuit part, which is a connection circuit for connecting the system board part 230, which is a PCB), to the display panel 160 is performed.

In the case of a liquid crystal display panel, the display panel 160 again includes a plurality of gate lines, data lines, and pixels defined in crossing regions thereof, and a thin film transistor that is a switching element for controlling light transmittance in each pixel. It may be configured to include an array substrate, an upper substrate including a color filter and/or a black matrix, and a liquid crystal material layer formed therebetween.

Meanwhile, a display panel to which the present invention can be applied is not limited to such a liquid crystal display panel, and may include not only a display device such as a plasma display, but also a display device that emits light such as an OLED.

In addition, the backlight unit 130 used in a liquid crystal display device to which an embodiment of the present invention can be applied includes a light source module (not shown) including a light source such as an LED, a holder for fixing the light source, and a light source driving circuit, A light guide plate (LGP) or diffusion plate to diffuse light into the entire panel area, a reflector plate to reflect light in the direction of the display panel, an LED flexible circuit that controls the on/off of the light source, etc., and arranged on the top of the light guide plate As a result, it may include sub-units such as one or more optical films or sheets disposed for purposes of improving luminance, diffusing and protecting light, and the like.

In addition, the cover bottom 120 constituting the display device 100 is a plate-like member made of a metal material or a plastic material, and includes a rear portion supporting the entire rear surface of the display device and a side portion extending therefrom to cover a part of the side surface of the backlight unit. .

The guide panel 140 is a plastic structure for attaching the display panel 160 from the upper side while being coupled to the cover bottom 120 and covering a part of the front surface of the backlight unit 130.

In this specification, the term “display device” refers to a display device such as a liquid crystal module (LCM) including a display panel and a driver for driving the display panel, as well as a television, which is a finished product including such an LCM. It is used as a concept including a set electronic device or even a set device such as a computer monitor, a mobile electronic device such as a smart phone or an electronic pad.

That is, the display device in the present specification is used to include not only a narrow display device such as an LCM, but also a set device that is an application product including the display device.

Meanwhile, the display device of FIG. 1 requires a driving unit such as a gate driving unit and a data driving unit to drive the display panel by applying a gate signal and a data signal to the gate line and the data line, respectively, and the gate driving unit has a circuit inside the panel. It may be a gate-in-panel (GIP) method formed as a device, or may be manufactured as a separate circuit device and mounted on a display panel.

In addition, the data driver is implemented as a data driving circuit or an integrated circuit element called a drive IC (D-IC), mounted on a source printed circuit board (Source PCB) 230, and then disposed on the rear or side of the display panel. The above-described COF is used to connect the PCB to the display panel.

Of course, among the data driving circuits, the D-IC or the like is not mounted on the source PCB and may be disposed on the COF.

In this way, the source PCB 230, which is a circuit component for driving the display panel, may be classified into a full-folding or half-folding method according to a position or method in which the display panel is mounted. , This will be described in more detail with reference to FIG. 2 below.

2 is a cross-sectional view schematically showing two source-PCB mounting methods.

FIG. 2A is a half-folding method using a short 5-hole PCB. Similar to the structure of FIG. 1, a structure for supporting the backlight unit 130 and the display panel 160 is provided with the cover bottom 120 and A guide panel 140 or the like is used, and the source PCB 230 is mounted on the side of the guide panel 140.

Therefore, since the path from the source PCB 230 to the display panel 160 is relatively short, a short 5-hole length COF 240 can be used, and accordingly, the possibility of an error in signal transmission due to a reduction in the length of the COF, which is a connection circuit. It has the advantage of reducing the back.

However, in the half-folding method as shown in (a) of FIG. 2, since the source PCB 230 is mounted to extend long on the side of the display panel, the thickness of the display panel increases, and thus the thickness of the entire display device and the set device is also increased. There was a problem.

2(b) shows a full-folding method similar to that of FIG. 1, wherein the source PCB 230 is mounted substantially parallel to the rear surface of the cover bottom, and the display panel is displayed through the COF 250. It is connected to the front.

In the method (b) of FIG. 2, in particular, the source PCB holder 170 may be used separately to mount the source PCB 230 on the rear surface of the cover bottom.

In this way, in the full-folding method of FIG. 2(b), the source PCB 230 is disposed on the rear of the cover bottom, so that the thickness of the display panel can be reduced and display, unlike the half-folding method described above. There is an advantage that the structure of the side of the panel is simplified.

However, since the path from the source PCB 230 to the display panel 160 is long, a short COF having a 5-hole length cannot be used, and a long 7-hole COF 250 has to be used.

As described above, the half-folding method using the 5-hole COF 240 and the full-folding method using the 7-hole COF 250 have different advantages and disadvantages.

3 is a detailed cross-sectional view of a display device having a source-PCB mounting configuration of a full-folding method using a typical 7-hole COF.

As shown in FIG. 3, a full-folding display device using a 7-hole COF includes a backlight unit 130 and a display panel 160, and supports the cover bottom 120 and the guide panel 140 as a supporting structure. ), etc. are used.

In addition, the source PCB 230 including the data driving circuit, etc., is disposed on the rear surface of the cover bottom through the holder 170, and is mounted to have an angle of θ1 and a normal vector A perpendicular to the display panel. -It is connected to the front surface of the display panel 160 through the hole COF.

In this case, θ1, which is an angle formed by the mounting surface of the source PCB 230 and the normal vector A of the display panel, is usually 70 to 90 degrees, and 90 degrees means complete full-folding.

Meanwhile, in the full-folding display device using a 7-hole COF as shown in FIG. 3, the structure of the cover bottom 120 and the guide panel 140, which is a support structure, is changed because a long 7-hole COF is used. The existing form could be used without need.

That is, of the four sides of the display device, the cover bottom 120 has a long support rib 122 that is bent toward the rear side of the cover bottom 120 as well as the other edge of the source PCB, and the outer support rib 142 of the guide panel 140 ) Is mounted to contact the outside of the support rib 122 of the cover bottom, and the inner support rib 142 of the guide panel 140 presses the upper surface of the cover bottom to maintain the gap between the cover bottom and the guide panel.

At this time, the cover bottom 120 and the guide panel 140 are connected to each other through a hook structure formed between the support rib 122 of the cover bottom and the outer support rib 144 of the guide panel 140 or a separate screw member. Can be connected.

As described above, in the full-folding display device using a 7-hole COF as shown in FIG. 3, the support rib 122 of the cover bottom 120, which is a support structure, is formed relatively long, and the guide panel 140 on the outside thereof. In addition to being complicated as a double partition wall structure, the outer support ribs 144 of the guide panel 140 were also relatively formed along the road.

On the other hand, since the COF needs to be bent around the side surfaces of the cover bottom 120 and the guide panel 140, it is unsuitable to use a short 5-hole COF in the shape of the cover bottom and guide panel of the above-described structure.

In this way, in order to mount the source PCB in a structure close to full folding or full folding using a short 5-hole COF, it is necessary to transform the support structure such as the cover bottom and the guide panel of the general shape as shown in FIG. 3 to another shape. there was.

One embodiment of the present invention is focused on this point, in order to implement a source PCB mounting method of a full folding or semi-full folding structure using a short 5-hole COF, cover bottom and side support ribs of the guide panel It is characterized in that it minimizes and changes the position of the incision area for passing through the COF, the optical sheet hanger, and the position of the hook structure accordingly.

More specifically, the display device according to an embodiment of the present invention includes a display panel, a backlight unit including an optical sheet, and a source PCB for driving the display panel, and includes at least one of the display panel and the backlight unit. The cover bottom, which is a supporting structure, includes an incision area for passing through a COF through which a chip-on-film (COF) for connecting the source PCB to the display panel passes, but at least one of the incision areas for COF communication is formed to be bent toward the front side. It is configured to include a cover bottom provided with a sheet hook portion inserted into the through hole of the optical sheet of the backlight unit, and a guide panel connected to the cover bottom.

On the other hand, among the incision areas for passing through the COF of the cover bottom, the incision area for passing through the COF in which the sheet hanger is not provided is provided with only the cutting area without a bent portion, and the supporting area other than the incision area for passing through the COF is bent to the rear side and A reinforcing rib having a hook protrusion to be connected may be formed.

On the other hand, the guide panel coupled to the cover bottom may have a seat hook receiving groove in which an end portion of the seat hook portion of the cover bottom is accommodated, and a hook hole corresponding to the hook protrusion of the cover bottom.

Hereinafter, a display device using a 5-hole COF according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 and 8.

4 is a plan view, an enlarged perspective view, and an enlarged cross-sectional view of a cover bottom used in an embodiment of the present invention, FIG. 5 is an enlarged perspective view of a guide panel, and FIGS. 7 and 8 are cross-sectional views.

For convenience of explanation, the entire structure of the display device according to the exemplary embodiment of the present invention will be first described with reference to FIGS. 6 and 7, and then detailed configurations of the cover bottom and the guide panel, which are major components, will be described. .

6 and 7, the display device according to the exemplary embodiment of the present invention includes a display panel 460, a backlight unit 430 including an optical sheet 438, and a source PCB 530 for driving the display panel. ), and a cover bottom 420 and a guide panel 440 which are supporting structures such as a display panel.

Among them, the cover bottom 420, which is a supporting structure of at least one of the display panel and the backlight unit, is a chip-on-film (COF) for connecting the source PCB 530 to the display panel, in particular, a short COF having a 5-hole length. Includes a cut-out area for passing through the COF (422, 422' in FIG. 4), which is an area cut to pass with the 550, but at least one of the cut-out areas for COF communication is formed to be bent toward the front side, and the optical sheet 438 of the backlight unit The sheet hook portion 424 inserted into the through hole of is formed (see FIG. 6 ).

On the other hand, in the cover bottom 420, the cut region 422 ′ for passing through the COF in which the sheet hook portion 424 is not provided among the cut regions for passing through the COF described above may be formed with only a portion of the cutting region 425 without a bent part. .

That is, in the cover bottom 420 according to the embodiment of the present invention, there is an incision area in which the side ribs are removed by a certain width (a little larger than the COF) in order for the COF to pass, but the incision area for passing through the COF is It includes a first region 422 in which the sheet hook portion 424 bent toward the side is formed, and a second region 422 ′ in which only the cutting region 425 exists without the sheet hook portion.

As shown in FIG. 7, a support rib 426 bent rearward is provided in a support region other than the incision region for passing through the COF of the cover bottom 420 according to an embodiment of the present invention, and some regions of the support ribs A hook protrusion 428 connected to the guide panel is formed.

On the other hand, the guide panel 440 according to the embodiment of the present invention coupled to the cover bottom is a bent plastic member having an overall “a” shape, and the bent portion is disposed outside the support rib 426 of the cover bottom to be described later. It is a structure that is fixed to the cover bottom by a hook structure.

In detail, the guide panel 440 is disposed between the display panel 460 and the backlight unit 430 to support the display panel 460 disposed on the upper side, and the horizontal support part 443 and the horizontal support part 443 ), the sidewall portion 447, which is a side portion bent toward the rear side of the display panel, and a sidewall of a portion of the sidewall portion 447 corresponding to the cutout area for COF passage of the cover bottom (422, 422' in FIG. 4) Are deleted to form the removal region 445.

In addition, as shown in FIG. 6, a portion of the horizontal support portion 443 of the guide panel 440 that abuts against the front end of the seat hook portion 424 of the cover bottom 420 is an end portion of the seat hook portion 424 of the cover bottom. A seat hook receiving groove 444 for receiving it may be provided.

The seat hook portion receiving groove 444 accommodates the front end of the seat hook portion 424 of the cover bottom 420 therein, so that the inner support rib of the guide panel of the conventional double partition wall structure as shown in FIG. Like 142), while the cover bottom 420 and the guide panel 440 are coupled to each other, the gap between the two members is kept constant, and the horizontal movement of the cover bottom 420 and the guide panel 440 is impossible. Can function.

That is, the seat hook portion 424 of the cover bottom 420 and the seat hook portion receiving groove 424 of the guide panel 440 are spacers for maintaining a gap between both members and a stopper that prevents horizontal movement. It functions as a (Stopper) or a positioner.

On the other hand, as shown in FIG. 7, the side wall portion 447 of the guide panel extends to cover the outside of the support rib 426 of the cover bottom 420, and the cover bottom is provided on the outer surface of the guide panel side wall portion 447. A hook hole 448 for connecting to the hook protrusion 428 formed on the support rib 426 of the is formed.

In addition, a panel reinforcing rib 446 for reinforcing the strength of the side wall portion may be formed on the inner surface of the side wall portion 447 of the guide panel 440.

Meanwhile, as shown in FIGS. 6 and 7, the source PCB 530 is mounted on the rear side of the cover bottom, and the 5-hole COF 550 is extended and bent from the source PCB 530 to be connected to the front surface of the display panel 460. do.

In the case of the cover bottom and the guide panel of the present invention, compared with the structure shown in FIG. 3, not only is the side length reduced, but also the coupling structure and the shape of the cut area and the shape of the seat hook according to the decrease in the side length. By deforming, the full-folding mounting of the source PCB 530 is possible with only a short 5-hole COF while maintaining the supporting force of the structure.

In the present specification, in the case of full-folding using a 5-hole COF, as shown in FIG. 8, since it has a slight angle with the rear of the display panel, the source PCB is arranged completely parallel to the display panel as shown in FIG. In order to distinguish it from complete full-folding (θ1 = 90 degrees), it may be expressed as semi-full-folding or qusi-full folding.

Hereinafter, the remaining components of the display device according to an embodiment of the present invention will be described in detail.

The display panel 460 used in the exemplary embodiment of the present invention may be a liquid crystal display panel, but is not limited thereto, and should be understood to include all types of display panels such as a plasma display and an organic light emitting diode (OLED) display panel. do.

In the case where the display panel 460 according to an embodiment of the present invention is a liquid crystal display panel, again, a plurality of gate lines and data lines, pixels defined in crossing regions thereof, and light transmittance of each pixel are adjusted. An array substrate including a thin film transistor (TFT), which is a switching element for, an upper substrate including a color filter and/or a black matrix, and a liquid crystal material layer formed therebetween, and a touch window It may be additionally disposed on the upper front surface of the display panel. In addition, the display panel 560 may additionally include upper and lower polarizing plates.

In addition, the backlight unit 430 used in the embodiment of the present invention includes a light source module (not shown) including a light source (LED) such as an LED in detail, and a light guide plate (LGP; 436) for diffusing light to the entire panel area. ) Or a diffusion plate, a reflector 434 for reflecting light in the direction of the display panel, an LED flexible circuit (LED FPC; not shown), which is a circuit for controlling the on/off of the light source, and the luminance by being disposed on the light guide plate. It may include sub-units such as one or more optical films or optical sheets 438 arranged for the purpose of enhancement, light diffusion and protection, and the like.

The light source module in the embodiment of the present invention may include a light source element, and a light source holder or light source PCB having a long plate structure including an LED driving circuit for supporting the light source element and driving the light source, and the light source element of the light source module is A light emitting diode (LED) or a light emitting diode strip may be used, but is not limited thereto, and any type of light source may be used as long as it can provide light necessary for the display panel.

The light guide plate (LGP; 436) may be formed of a rectangular clear plastic sheet that is generally die-cut, extruded, or injection-molded from a plastic sheet, and light from a light source such as a light emitting diode array is transmitted to the edge of the light guide plate. The light is emitted from the light guide plate and diffuses across the rear surface of the display panel while being totally reflected inside the light guide plate, and the light emitted through the flat top surface of the light guide plate functions as a backlight of the display panel.

The reflecting plate 434 is located on the rear surface of the light guide plate 436 and reflects the light that has passed through the rear surface of the light guide plate 436 toward the display panel 460 to improve the luminance of the light.

The optical sheet 438 disposed on the light guide plate 436 includes a diffusion sheet and at least one light collecting sheet, etc., and diffuses or condenses the light passing through the light guide plate 436 to form a more uniform surface of the display panel 460. The light source is to be incident.

Meanwhile, at least one through hole must be formed at the edge side of the optical sheet 438 used in the embodiment of the present invention in order to fit the sheet hook portion 424 of the cover bottom 420.

Meanwhile, the cover bottom 420 in the present specification includes all types of support structures for supporting at least one of a backlight unit or a display panel, and includes a base frame, a metal frame, and It can be used in other expressions such as Metal Chassis, Chassis Base, etc., and as a support for fixing at least one of the display panel and backlight unit, all types of frames or plate structures disposed at the base of the display device are used. It should be understood as an inclusive concept. The cover bottom 420 may be formed of both a metal material or a plastic material.

In addition, the source PCB 530 in the present specification includes all types of driving circuits for providing a data output signal or a source output signal to a data line formed on the display panel, and a driving circuit for touch control. It should be interpreted as including all types of externally mounted circuit boards for driving the system.

In addition, the COF 550 as a connection circuit for connecting the source PCB 530 to the display panel 460 is a flexible printed circuit (FPC), a chip-on-film circuit, and a chip-on-flexible printing. Although other expressions such as a circuit (Chip On Flexible Printed Circuit) may be used, a COF circuit is described as an example in this specification for convenience.

In general, COF, FPC, or TCP is formed on a flexible insulating film that can be bent, and a wiring or circuit that can be electrically connected to other circuit wiring is formed. Although there are some differences between COF and TCP, they are common in that circuit wiring is formed on them using a flexible film or tape that can be insulated, and they can be used as a substitute because they can perform the same function in a display device. Accordingly, an embodiment of the present invention may have both cases of COF and TCP, and will be described by representing COF.

In addition, as shown in FIG. 8, in an exemplary embodiment of the present invention, a case top 410 may be additionally used as a member for protecting a part of the front surface of the display device. It is a metal plate member in the form of “L” to cover and protect the front edge and side of the display device.

In this specification, the case top is a concept including all types of covers, frames, etc. to protect the front part of the display panel by extending from the side of the display device to a part of the front surface. It is not limited.

A detailed configuration of the cover bottom 420 according to an embodiment of the present invention will be further described with reference to FIG. 4 as follows.

As shown in FIG. 4, the cover bottom 420 used in the embodiment of the present invention is in the form of a cover covering the entire rear surface of the display panel, and is an edge to which the source PCB is connected among four sides or edges (A, B, C). A is formed with the aforementioned incision areas 422 and 422' for passing through the COF, and the remaining three sides or edges (B, C) have no incision areas for passing through the COF, and the support rib 426 and the middle of the support rib described above. It may include only the hook protrusion 428 formed in the middle and fixed to the guide panel.

That is, as shown in Figure 4, the COF connection edge (A) of the cover bottom 420 according to the embodiment of the present invention is intermittently formed with a certain width for the COF passing cutout regions (422, 522'), for passing the COF A support region for fixing with the guide panel is formed between the cutout regions, and a support rib 426 bent to the rear of the display panel is formed in the support region.

The cover bottom 420 may be formed of a metal plate-like member having a predetermined thickness.

In one of the cutout areas 422 and 422' for passing through the COF of the cover bottom, a sheet hook portion 424 is formed that is bent toward the front side of the display panel in the opposite direction to the support rib 426 and is inserted into the through hole of the optical sheet. In addition, only the cutting area 425 may be formed without a sheet hook in the rest of the cut areas for passing through the COF.

That is, about 6 to 8 cutouts for passing through the COF may be formed over the entire edge A of the cover bottom, and about 3 to 4 are sufficient for supporting the optical sheet 428 of the backlight unit over the entire edge A, A sheet hook portion 424 is formed in some of the cutout areas for passing through the COF, and only the cutting edge 425 for passing through the COF is formed without the sheet hooking portion in the rest.

In addition, on the support rib 426 of the cover bottom 420, a hook protrusion 428 for hooking with the hook hole 448 of the guide panel 440 is formed.

On the other hand, in order to minimize the passage path of the 5-hole COF 550, the sheet hook portion 424 and the cutting region 425 of the cut region for passing through the COF are formed more inside than the support rib 426 of the support region. can do.

That is, as shown in the enlarged cross-sectional view of FIG. 4, the sheet hook portion 424 and the cutting area (not shown) are formed inward by a distance H than the support rib 426, that is, in the center direction of the display panel. While minimizing the passage path, the optical sheet can be caught inside the support rib 426 which is the side wall of the cover bottom.

A detailed configuration of the guide panel 440 according to an embodiment of the present invention will be further described with reference to FIG. 5 as follows.

As shown in FIG. 5, the guide panel 440 according to the embodiment of the present invention is a frame structure made of a plastic material having a “a” shape, and includes a horizontal support portion 443 and a sidewall portion 447 vertically bent therefrom.

The horizontal support part 445 is disposed between the display panel 460 and the backlight unit 430 to support the display panel 460 disposed on the upper side, and the sidewall part 447 is outside the support rib 426 of the cover bottom. It surrounds and forms a side structure for being fixedly coupled to the cover bottom 420 by hook coupling.

On the other hand, the portion in the path through which the COF 550 passes among the side wall portions 447 of the guide panel 440, that is, corresponding to the cutout regions 422 and 422' for passing the COF of the cover bottom when combined with the cover bottom. The sidewall portion of the portion may be removed to form the removal region 445.

The upper figure of FIG. 5 is a perspective view of the guide panel 440 viewed from the front side, and the figure below is a perspective view viewed from the rear side.

As shown in the rear perspective view of FIG. 5, among the horizontal support portions 443 of the guide panel 440, the rear portion of the cover bottom 420 abuts against the front end of the seat hook portion 424 is the seat hook portion of the cover bottom. A seat hook receiving groove 444 for receiving the end of the 424 may be provided.

As described above, such a seat hook portion receiving groove 444 accommodates the front end of the seat hook portion 424 of the cover bottom, so that when the guide panel is coupled to the cover bottom, the gap between the two members is maintained and the relative It serves to limit movement.

In addition, a hook hole 448 is formed in a region of the side wall portion 447 of the guide panel 440 corresponding to the hook protrusion 428 of the cover bottom, through which the guide panel 440 and the cover bottom 420 Can be fixedly coupled.

Further, a panel reinforcing rib 446 for reinforcing the strength of the side wall portion may be additionally formed inside the side wall portion 447 of the guide panel 440.

The guide panel 440 according to an embodiment of the present invention as described above can be replaced by other expressions such as a plastic chassis, p-chassis, support main, main support, mold frame, etc., and has a cross-sectional shape with one or more bent portions. As a frame-shaped structure, it should be interpreted as including all types of support structures that are connected to a cover bottom 420 and used to support a backlight unit and a display panel.

The guide panel 440 is made of a mold material of a synthetic resin such as polycarbonate, and may be manufactured through an injection molding method, but is not limited thereto.

8 is a diagram illustrating a state in which a source PCB is mounted according to an embodiment of the present invention.

As shown in FIG. 8, according to an embodiment of the present invention, by simply and shortly deforming the side structures of both members without interfering with the supporting force or coupling force between the cover bottom and the guide panel, the source PCB using the 5-hole COF 550 When 530 is mounted, the source PCB 530 has an angle of θ2 with the normal direction A of the display panel.

That is, the angle between the source PCB mounting surface of the source PCB holder 470 mounted on the back of the cover bottom and the display panel normal is θ2, and this θ2 has a range of about 55 to 65 degrees, more preferably about 60 degrees. Will have.

According to an embodiment of the present invention, when the angle θ2 between the source PCB mounting surface and the display panel normal is smaller than the above-mentioned angle range, the side thickness of the display panel increases as it approaches the half folding described in FIG. 2. In addition, if θ2 is larger than the above range, the thickness of the display panel can be reduced, but there is a concern that interference with other components may occur.

In addition, as shown in FIG. 8, in the display device according to the exemplary embodiment of the present invention, a cover shield 480 covering the entire rear surface of the cover bottom 420 may be additionally included.

An electromagnetic interference (EMI) contact part 482 for reducing or shielding electromagnetic interference generated from the source PCB is formed on the inner surface of the cover shield 480 that faces the source PCB 530, or the cover shield 480 A separate electromagnetic interference reducing member may be provided between the inner surface of) and the source PCB 530.

According to one embodiment of the present invention as described above, by changing the structure of the cover bottom supporting the display panel and the guide panel, full-folding even with a relatively short COF (5-hole COF). There is an effect that the source PCB can be mounted close to the.

As a result, it is possible to mount the full-folding of the source PCB using a 5-hole COF without affecting the support or bonding force of the display panel, so that the length of the COF can be reduced without increasing the thickness of the display panel. It is possible to achieve cost reduction and signal transmission error reduction effects through length reduction.

The description above and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the technical field to which the present invention pertains, combinations of configurations within the scope not departing from the essential characteristics of the present invention. Various modifications and variations, such as separation, substitution, and alteration, will be possible. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

410: case top 420: cover bottom
422, 422': cut-out area for passing through COF 424: sheet hanger
426: support rib 428: hook protrusion
430: backlight unit 438: optical sheet
440: guide panel 443: horizontal support
444: seat hook portion receiving groove 447: side wall portion
448: hook hole 460: display panel
470: source PCB holder 480: cover shield
530: source PCB 550: 5-hole COF

Claims (11)

Display panel;
A backlight unit including a light source module, a light guide plate, and an optical sheet;
A source printed circuit board (PCB) including a driving circuit for driving the display panel;
A cut-out area for passing through a COF through which a chip-on-film (COF) for supporting at least one of the display panel and the backlight unit passes, and for connecting the source PCB to the display panel, and the cut-out area for passing the COF At least one of them is provided with a sheet hanger that is bent toward the front side and inserted into the through hole of the optical sheet of the backlight unit, and the cutout area for passing through the COF in which the sheet hanger is not provided among the cutout areas for passing through the COF is cut without a bend A cover bottom provided with only an area; And
A guide panel connected to the cover bottom;
Display device comprising a. delete The method of claim 1,
A display device in which a support rib bent rearward is provided in a support region of the cover bottom other than the cutout region for passing the COF, and a hook protrusion connected to the guide panel is provided in a portion of the support ribs. The method of claim 3,
A display device in which the sheet hook portion of the cut area for passing through the COF and the cutting area are provided further inside the support rib of the support area. The method of claim 1,
It further includes a source PCB holder mounted on the rear side of the cover bottom, wherein the source PCB holder is mounted on the rear side of the cover bottom so that an angle between the source PCB mounting surface of the source PCB holder and the display panel normal vector is 55 to 65 degrees. Display device. The method of claim 1,
The guide panel includes a horizontal support portion disposed between the display panel and the backlight unit to support a lower surface of the guide panel, and a sidewall portion bent from the horizontal support portion and coupled to a side surface of the cover bottom. The method of claim 6,
A display device having a sidewall removal region from which the sidewall is removed in a portion of the guide panel corresponding to the cutout region for passing the COF of the cover bottom. The method of claim 6,
A display device in which a seat hook receiving groove is provided in the horizontal support portion of the guide panel corresponding to the COF cutout area of the cover bottom to accommodate an end of the seat hook portion of the cover bottom. The method of claim 6,
A display device in which a hook hole corresponding to a hook protrusion of the cover bottom is provided in a portion of the sidewall portion of the guide panel. The method of claim 6,
A display device in which a panel reinforcing rib is provided inside the sidewall portion of the guide panel. The method of claim 1,
The display device further includes a cover shield that covers an outside of the cover bottom, and an electromagnetic interference (EMI) contact part is provided on an inner surface of the cover shield facing the source PCB.

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