KR102206335B1 - Display device - Google Patents

Abstract

According to one aspect of the present invention, a display device includes: a display panel; a light guide plate disposed to face the display panel; a cover bottom for accommodating the light guide plate in an accommodating space partitioned by a sidewall; a light source for supplying light into the light guide plate from a first side surface of the light guide plate; a reflector disposed on a second side surface opposite to the first side surface and reflecting light emitted from the light source to the inside; and a holder disposed between the reflector and the sidewall of the cover bottom to fix the light guide plate. The present invention provides the display device with increased luminance.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device in which the size of a bezel is reduced while simplifying the assembly of components constituting the display device.

As the information society develops, the demand for display devices is also increasing in various forms. In response to this, recently, LCD (Liquid Crystal Display Device), PDP (Plasma Display Panel), ELD (Electro luminescent Display), VFD (Vacuum Fluorescent Display) and other various display devices have been studied and used.

Among them, the liquid crystal panel of the LCD includes a TFT substrate and a color filter substrate facing each other with a liquid crystal layer and a liquid crystal layer therebetween, and an image can be displayed using light supplied from a light source.

An object of the present invention is to provide a display device with increased luminance.

A display device according to an aspect of the present invention for achieving the above object includes a display panel, a light guide plate disposed to face the display panel, a cover bottom for accommodating the light guide plate in a storage space partitioned by a side wall, and the light guide plate. A light source for supplying light into the light guide plate from a first side, a reflector disposed on a second side surface opposite to the first side, and reflecting light from the light source inward, between the reflector and the sidewall of the cover bottom It is arranged to include a holder for fixing the light guide plate.

The reflector has a shape corresponding to the second surface of the light guide plate, and is attached to the second surface of the light guide plate with an adhesive.

The reflector is a portion corresponding to the holder and has a cutout from which a portion of the reflector is removed.

The reflector includes a first edge corresponding to a front surface of the light guide plate and a second edge corresponding to a rear surface of the light guide plate, and the cutout is formed on the first edge.

The holder includes a body and a plurality of protrusions protruding from the body toward the reflector.

The plurality of protrusions are formed to contact the reflector at a position corresponding to the cutout.

The width of the cutout in the longitudinal direction of the reflector is greater than the width of the holder.

The reflector has a rectangular strip shape, and the depth of the cutout is 20% to 30% of the height of the reflector.

The effect of the display device according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, a reflector is disposed on a surface opposite to a surface on which light is incident in a light guide plate having an edge type light source structure in which the light source is positioned on the side. Therefore, it is possible to improve luminance by reflecting light coming out of the light guide plate to the inside of the light guide plate.

In addition, according to an embodiment of the present invention, since the reflector is configured to include a cutout portion, it is possible to solve the problem of light splashing caused by the reflector being pushed onto the light guide plate.

Further scope of applicability of the present invention will become apparent from the detailed description below. However, since various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, specific embodiments such as the detailed description and preferred embodiments of the present invention should be understood as being given by way of example only.

1 is a diagram showing a schematic configuration of a display device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1.
3 shows an optical sheet and a light source
4 shows a cross-sectional view of FIG. 4 in an assembled state.
5 is a view for explaining a position of a reflector disposed on a light guide plate.
6 is a view showing an example reflector.
7 is a schematic plan view showing the holder is arranged
8 shows an example of a holder.
9 schematically illustrates a problem that may occur in the reflector due to interference of the holder.
10 is a view showing another example of a reflector.
11 is a view showing a front view of a reflector of another example.
12 is a view showing a holder corresponding to a cutout portion formed in a reflector of another example.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted.

The suffixes "module" and "unit" for components used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Display panels applicable to the present invention include Organic Light Emitting Diode (OLED), Plasma Display Panel (PDP), Field Emission Display (FED), and Liquid Crystal. Display, LCD). The following description of the embodiment describes an example in which the display panel is formed of a liquid crystal panel.

Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a diagram showing a schematic configuration of a display device according to an embodiment of the present invention. In FIG. 1, (a) shows an assembled state of the display device, and (b) shows an exploded view of the display device. In FIG. 1, the screen of the display device is illustrated in a direction toward the y-axis. For reference, in the coordinate axes indicated in the drawings attached to the present specification, the y-axis indicates the direction in which the screen of the display device faces.

The display device 100 according to an embodiment includes a case top 110, a display panel 120, a guide panel 130, an optical sheet 140, a cover bottom 150, a back cover 160, and a light source 170. Consists of including.

The case top 110 may be disposed in front of the display panel 120. Here, the front means a direction in which the display device 100 displays a screen. Hereinafter, the front direction is used to mean the direction in which the screen is displayed.

The case top 110 is configured to surround at least a portion of an edge and a side surface of the front surface of the display panel 110. A portion of the case top 110 disposed on the front surface of the display panel 110 functions as a bezel.

The display panel 110 is provided on the front side of the display device 100 to display an image toward the front side, and may be located behind the case top 110.

In one example, the display panel 110 may be a liquid crystal display panel configured to include a rear substrate disposed to face a front substrate and a liquid crystal layer disposed therebetween. The front substrate may be configured to include color filters implementing red (R), green (G), and blue (B) sub-pixels. The rear substrate may include switching elements. The rear substrate can switch the pixel electrode. For example, the pixel electrode may change the molecular arrangement of the liquid crystal layer according to a control signal applied from the outside. The liquid crystal layer may include liquid crystal molecules. The arrangement of the liquid crystal molecules may be changed according to the voltage difference generated between the pixel electrode and the common electrode. The liquid crystal layer may transmit or block light provided from the light source 170 to the front substrate. The light source is located behind the display panel 110 and supplies light to the front side. More precisely, depending on the location of the light source, the light source can be classified into a direct type and an edge type. Among them, the direct type is a method of supplying light in a direction perpendicular to the light guide plate, which is a component of the optical sheet 140, or directly from the rear of the display panel 120, and in the edge type, the light source is disposed on the side of the light guide plate to This refers to a method of supplying to the side of the light guide plate. Among them, the present invention is an invention suitable for a structure in which the light source is an edge type.

The optical sheet 140 functions to be positioned behind the display panel 110 so that a light source is evenly transmitted to the display panel 110. The optical sheet 140 may be configured to have a plurality of sheets or a layered structure. For example, the optical sheet 125 may include a prism sheet, a diffusion sheet, and a light guide plate.

The guide panel 130 is partially positioned between the display panel 110 and the optical sheet 140 to form an air gap between the two. In addition, the guide panel 130 is disposed to surround the display panel 110 to protect the display panel 110 from impact.

The cover bottom 150 may support components of the display device 100. For example, the cover bottom 150 may support the light source or the optical sheet 140. The cover bottom 150 is made of a metal material such as an aluminum alloy to support the device.

The back cover 160 may be located at the rear or rear of the display device 100. In one example, the back cover 160 is made of an extruded product.

FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1.

As illustrated in FIG. 2, the cover bottom 150 may be configured to include a side wall 151 that divides the storage space. The optical sheets 140 may be sequentially stacked and disposed on the storage space partitioned by the sidewall 151, and the display panel 120 may be disposed thereon to face the optical sheet. In addition, since the display panel 120 and the optical sheet 140 are spaced apart by the guide panel 130, light may be supplied to the display panel 120 through the optical sheet 140 in the form of a surface light source.

In the display device according to an exemplary embodiment, a light source 170 that supplies light to the display panel 120 is disposed on one side of the light guide plate 143. In addition, a reflector 180 may be disposed on the other side opposite to the side on which the light source 170 is disposed. The reflector 180 prevents light incident to the side of the light guide plate 143 through the light source 170 from escaping to the other side, and increases the amount of light supplied to the light guide plate 143 by reflecting it back inside. Do it. If the case where the reflector 180 is not disposed (hereinafter, Comparative Example) and the case where the reflector 180 is disposed are compared under the same conditions, an embodiment in which the reflector is disposed has an effect of increasing luminance by about 5% compared to the comparative example. It can be confirmed through the experimental results.

In addition, the display device according to an exemplary embodiment includes a holder between the side wall 151 of the cover bottom 150 and the side surface of the light guide plate 143, more precisely, between the reflector 180 and the side wall 151 disposed on the side wall of the light guide plate 143. The 190 may be further disposed to be configured to fix the light guide plate 143.

Hereinafter, an arrangement and configuration of an optical sheet and a light source will be described in more detail with reference to FIGS. 3 and 4. 3 shows a state of an optical sheet and a light source, and FIG. 4 shows a cross-sectional view of FIG. 4 in an assembled state.

Referring to these drawings, the light source 170 may be configured to include a substrate 171 and a device 173 emitting light.

The substrate 171 may be a printed circuit board (PCB).

Devices 173 may be mounted on the substrate 171 with a predetermined distance. The elements 173 may be smaller than the thickness of the light guide plate 143. Therefore, most of the light provided from the elements 173 can be transmitted to the light guide plate 143.

The elements 173 may be, for example, a light emitting diode (LED) chip or a light emitting diode package including at least one light emitting diode chip.

The elements 173 may be composed of colored LEDs or white LEDs that emit at least one color among colors such as red, blue, and green.

The elements 173 may be configured as a Chip On Board (COB) type. Since the COB type is a form in which the LED chip is directly coupled to the substrate 122, the process of manufacturing the light source can be simplified. In addition, it is possible to lower the resistance, thereby reducing the energy lost as heat. That is, it means that the power efficiency of the devices 173 can be increased.

The light source 170 of this configuration is disposed to face the side surface of the light guide plate 143.

The light guide plate 128 may spread light incident from the light source 170 widely.

The optical sheet 140 may be configured to include a first optical sheet 141 disposed on the rear surface of the light guide plate 143, a light guide plate 143, and a second optical sheet 145 disposed on the front surface of the light guide plate 143. have.

The first optical sheet 141 may be a reflective sheet. The reflective sheet 141 may be located behind the light guide plate 143. The reflective sheet 141 may reflect light supplied from the light source 170 to the light guide plate 143 or may reflect light emitted from the light guide plate 143 back into the light guide plate 143.

The reflective sheet 141 may include at least one of a reflective material, a metal and a metal oxide. For example, the reflective sheet 141 includes a metal and/or a metal oxide having a high reflectivity such as at least one of aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO2). can do.

The reflective sheet 141 may be formed by depositing and/or coating a metal or metal oxide. The reflective sheet 141 may be printed with ink including a metal material. The reflective sheet 141 may have a vapor deposition layer formed using a vacuum deposition method such as a thermal evaporation method, an evaporation method, or a sputtering method. A coating layer and/or a printing layer using a printing method, a gravure coating method, or a silk screen method may be formed on the reflective sheet 141.

An air gap may be positioned between the light guide plate 143 and the second optical sheet 145 disposed on the front surface 143 of the light guide plate. The air gap may disperse light emitted from the light source 170.

The second optical sheet 145 may be positioned in front of the light guide plate 143. The rear surface of the second optical sheet 145 may face the light guide plate 143, and the front surface of the second optical sheet 145 may face the rear surface of the display panel 120.

The second optical sheet 145 may include, for example, three sheets 145a, 145b, and 145c. In this case, the second optical sheet 145 may include one or more prism sheets and/or one or more diffusion sheets. The plurality of sheets included in the second optical sheet 145 may be adhered to and/or adhered to each other.

For example, the second optical sheet 145 may include one positive sheet 145a and two prism sheets 145b and 145c, and the number and/or position of the diffusion sheet and the prism sheet may be changed. I can.

The diffusion sheet may prevent the light emitted from the light guide plate 143 from being partially concentrated, thereby making the light distribution uniform. The prism sheet functions to face the display panel 120 by condensing light emitted from the diffusion sheet.

5 is a view for explaining the position of the reflector 180 disposed on the light guide plate.

In FIG. 5, the light guide plate 143 may have a substantially rectangular planar shape. Accordingly, the light guide plate 143 may have two long axes 143c and 143d and two short axes 143a and 143b, and the long axis and the short axis may correspond to the side surfaces of the light guide plate, respectively.

Assuming that the light source 170 is disposed to face the first long axis 143c of the light guide plate 143, the reflector 180 is preferably positioned on the second long axis 143d, more precisely, the second side 143d. .

Light supplied through the light source 170 is incident on the light guide plate 143 in a traveling direction from the first side 143c to the second side 143d. Accordingly, the light incident on the light guide plate 143 proceeds in the direction of the second side surface 143d, which is the opposite side of the first side surface 143c, and there is a high possibility that the light is lost from the second side surface 143d. In consideration of this point, it is preferable that the reflector 180 is disposed on the second side surface 143d that is opposite to the surface on which light is incident.

Meanwhile, FIG. 6 is a view showing the reflector 180 as an example. As illustrated in FIG. 6, the reflector 180 is preferably configured to have substantially the same shape as the second side surface 143d of the light guide plate 143. As the reflector 180 and the second side 143 have the same shape, the reflector 180 may be disposed on the entire second side 143d to cover the entire second side.

In one example, the reflector 180 may be a thin film (eg, about 1 mm). If the reflector 180 is in the form of a film, there is an advantage in that storage and attachment operations are easy. The reflector 180 may be attached to the second side 143d by an adhesive, in one preferred form.

This reflector 180 can be used as long as it reflects light and is easy to handle. For example, the reflector 180 may be configured with the same reflective sheet.

The reflector 180 may have a thin square strip shape to correspond to the shape of the second side surface 143d, but the shape is not limited thereto.

In an embodiment of the present invention, since the reflector is installed on the second surface opposite to the first surface on which light is incident on the light guide plate 180, it is possible to effectively prevent the light supplied to the light guide plate 180 from exiting again. . According to an experiment conducted by the present applicant, there is an effect that the luminance increases by about 5% when the reflector is present rather than the case without the reflector.

On the other hand, the light guide plate 143 contracts and expands due to the material properties of the surrounding environment, more precisely, by heat. Therefore, the light guide plate 143 is accommodated in the cover bottom so as to have a gap. In this case, the light guide plate 143 is not fixed and there is a risk of damage.

Therefore, the display device according to an exemplary embodiment may further include a holder 190 for eliminating a gap between the light guide plate 143 and the cover bottom.

7 schematically shows a state in which the holder 190 is disposed on a plane. In a preferred form, the holder 190 is positioned between the cover bottom 150, more precisely, the sidewall 151 of the cover bottom 150 and the light guide plate 143, and serves to fix the light guide plate 143. Therefore, in a preferred form, the holder 190 is preferably made of an elastic material, but is not limited thereto.

A plurality of holders 190 may be disposed between the cover bottom 150 and the light guide plate 143 in consideration of manufacturing cost, and the number of the holders may be appropriately adjusted according to the size of the display device.

8 shows an example of the holder 190. As shown in FIG. 8, the holder 190 may be configured to include a body 191 and a plurality of protrusions 193 protruding from one surface of the body.

When the holder 190 is disposed between the cover bottom 150 and the light guide plate 143, it is preferable that the protrusion 193 is disposed to face the light guide plate 150. The holder 190 is positioned between the cover bottom 150 and the light guide plate 143 and serves to fix the light guide plate 143. However, since the light guide plate 150 is contracted and expanded by heat, the clearance between the cover bottom 150 and the light guide plate 143 is also changed accordingly.

Since the holder 190 of an example includes a plurality of protrusions 193, even if the clearance changes, the protrusion absorbs the changed amount of clearance so that the light guide plate 150 can be fixed without impacting the light guide plate 143.

However, as the holder 190 is disposed between the cover bottom 150 and the light guide plate 143, a problem may occur due to the reflector 180, which will be described with reference to FIGS. 7 and 9. 9 schematically illustrates a problem that may occur due to interference of the holder 190 in the reflector 180.

In FIG. 9, (a) schematically shows the state before the problem occurs, and (b) shows the state after the problem occurs.

When the light guide plate 143 is expanded by heat, the gap between the cover bottom 150 and the light guide plate 143 is reduced, and the light guide plate 143 is pressed by the holder 190. As a result, the light guide plate 143 is pressed. A part of the attached reflector 180 may be pushed upward. Here, since the reflector 180 is thin, the entire reflector 180 is not pushed up when it is pushed up, and only a portion 185 corresponding to the holder 190 is pushed up selectively.

In this case, there is a problem in that light is reflected to the outside of the light guide plate 143 due to the portion 185 protruding from the light guide plate, thereby causing a light splash phenomenon that brightly shines on the screen.

In another example of the present invention, in consideration of this problem, the reflector 180 may be configured to include the cutout 181.

Hereinafter, a reflector 180 of another example will be described in detail with reference to FIGS. 10 to 12. 10 shows a reflector of another example, FIG. 11 shows a front view, and FIG. 12 shows a holder corresponding to a cutout portion.

In one example, the cutout 181 may be configured as a region in which a part of the reflector 190 is removed. The cutout 181 is formed in a portion corresponding to the holder 190, and the corresponding means refers to a portion in which direct contact with the reflector 180 occurs.

Such cutout portions 181 may be formed in a plurality of portions along the length direction (y-axis direction of the drawing) of the reflector 180 and a predetermined distance from neighboring ones.

When the reflector 180 includes the cutout 181, even if the light guide plate 143 expands and the reflector 180 is pushed up, the reflector 180 is pushed out of the light guide plate 143 due to the cutout 181. Can be prevented.

In a preferred form, the reflector 180 may include a first edge 180a and a second edge 180b in the height direction, and the cutout 181 may be formed on the first edge 180a among them. Here, the first edge 180a is a portion corresponding to the front surface 1431 of the light guide plate 143, and the second edge 180b is a portion corresponding to the rear surface 1432 of the light guide plate.

In a preferred form, the depth (D) of the cutout portion 181 may be configured in the range of 20 (%) to 30 (%) compared to the height (D) of the reflector 180. If the incision depth (D) is less than 20 (%), when the reflector 180 is pushed up, the reflector 180 may be exposed outside the light guide plate 143, and as a result, the problem of light bounce may be reproduced. .

In addition, it is preferable that the width W2 of the cutout 181 in the longitudinal direction is larger than the width W1 of the holder 190. If the width W2 of the cut-out part 181 is smaller than the width W1 of the holder 190, the amount of the reflector 180 pushed up is larger than the amount offset by the cut-out part 181 and this is also the reflector ( 180) may be exposed outside the light guide plate.

The embodiments of the present invention described above are not exclusive or distinct from each other. In the above-described embodiments of the present invention, each configuration or function may be used or combined.

For example, it means that a configuration A described in a specific embodiment and/or a drawing may be combined with a configuration B described in another embodiment and/or a drawing. That is, even if the combination between the components is not directly described, it means that the combination is possible except for the case where the combination is described as impossible.

The above detailed description should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (8)

Display panel;
A light guide plate disposed to face the display panel;
A cover bottom for accommodating the light guide plate in a storage space partitioned by a side wall;
A light source for supplying light into the light guide plate from a first side of the light guide plate;
A reflector disposed on a second side opposite to the first side and reflecting light emitted from the light source to the inside; And
A holder disposed between the reflector and a sidewall of the cover bottom to fix the light guide plate;
Including,
The reflector has a shape corresponding to the second surface of the light guide plate, and is attached to the second surface of the light guide plate with an adhesive,
The reflector is a portion corresponding to the holder and has a cutout from which a portion of the reflector is removed. delete delete The method of claim 1,
The reflector includes a first edge corresponding to the front surface of the light guide plate and a second edge corresponding to the rear surface,
The cutout portion is formed on the first edge. The method of claim 1,
The holder includes a body and a plurality of protrusions protruding from the body toward the reflector. The method of claim 5,
The plurality of protrusions are formed to contact the reflector at a position corresponding to the cutout. The method of claim 5,
A display device in which a width of the cutout in a longitudinal direction of the reflector is greater than a width of the holder. The method according to any one of claims 1, 4 to 7,
The reflector has a rectangular strip shape, and the depth of the cutout is 20% to 30% of the height of the reflector.

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