JP2010102018A - Display - Google Patents

Abstract

In a display device having a hybrid panel structure, resistance to vibration impact is improved.
A display panel having one substrate and a second substrate, a mold for housing the display panel, an upper polarizing plate disposed on an observer-side surface of the second substrate, and the upper polarizing plate The front panel is arranged on the viewer side of the plate, and the peripheral portions of the four sides of the first substrate are fixed to the mold by a double-sided tape, and the planar size of the front panel is the mold A display device in which the front panel is fixed to a housing, wherein the first substrate has a non-overlapping region that does not overlap with the second substrate, and the mold is formed on the first substrate. It has at least one protrusion on a side located outside one side of the non-overlapping region, the at least one protrusion of the mold is fixed to the housing, and the double-sided tape is the at least 1 Pair with protrusions It has a recess in a portion.
[Selection] Figure 1

Description

  The present invention relates to a display device, and more particularly, to a display device including a display panel, a mold frame that houses the display panel, and a front panel that is disposed on a viewer side surface of the display panel.

A TFT (Thin Film Transistor) type liquid crystal display device (also referred to as a liquid crystal display module) having a small liquid crystal display panel with a subpixel number of about 240 × 320 × 3 in color display is used for display of portable devices such as mobile phones. Widely used as a part.
In recent years, in the above-described liquid crystal display device, a front panel is fixed to a polarizing plate on the viewer side of the liquid crystal display panel via an adhesive having a refractive index equivalent to that of the polarizing plate (hereinafter referred to as a hybrid panel structure). Say) is known. Compared with the structure in which the front panel is disposed on the polarizing plate on the observer side of the liquid crystal display panel via the gap layer, this hybrid panel structure is (1) dust-free (contamination of foreign matter is less), ( 2) Thinning, (3) Good outdoor visibility, and (4) High luminance rate.

As prior art documents related to the invention of the present application, there are the following.
JP 2007-25484 A

FIG. 8 is a cross-sectional view of an essential part for explaining a conventional liquid crystal display device having a hybrid panel structure.
In FIG. 8, 1 is a first substrate, 2 is a second substrate, 4 is an upper polarizing plate, DRV is a semiconductor chip, 10 is a resin mold frame (hereinafter simply referred to as a mold), and 11 is a front panel. In practice, a flexible wiring board (FPC) is connected to the first substrate 1, but is not shown in FIG. 8.
The front panel 11 is bonded and fixed to an upper polarizing plate 4 on a second substrate 2 of a liquid crystal display panel (LCD) through an adhesive 9 having a refractive index equivalent to that of the upper polarizing plate 4. Here, the front panel 11 is formed in a square shape having a planar shape having four corners.
The lower surfaces of the four sides of the front panel 11 (only one side is shown in FIG. 8) projecting outward from the mold 10 of the front panel 11 are formed on the casing 20 of the mobile device (for example, a mobile phone). For example, it is fixed with an adhesive 22 such as a double-sided tape or an adhesive. The first substrate 1 of the liquid crystal display panel (LCD) is fixed to the mold with a double-sided tape 30.
In the liquid crystal display device shown in FIG. 8, the liquid crystal display panel (LCD) mold 10 is not fixed. Therefore, when an impact F shown in FIG. 8 is applied, stress is concentrated at the boundary between the first substrate 1 and the second substrate 2 as shown by an arrow A in FIG. There was a problem that occurred.

In order to solve the above-described problem, as shown in FIG. 10, a protruding portion 10A is formed on one side of the mold 10 on the side where the semiconductor chip (DRV) of the first substrate 1 is mounted. As shown in FIG. 5, it is assumed that the protruding portion 10A is fixed to the housing 20.
According to the structure shown in FIG. 9, even if the impact F shown in FIG. 9 is applied, the protrusion 10 </ b> A of the mold 10 is fixed to the housing 20, so that vibration of the liquid crystal display panel (LCD) can be suppressed. In addition, it is possible to prevent substrate cracking (substrate cracking indicated by arrow A in FIG. 9) that occurs at the boundary between the first substrate 1 and the second substrate 2.
However, in the structure shown in FIG. 9, vibration (bending stress) transmitted from the protruding portion 10 </ b> A of the mold 10 is transmitted to a region (non-overlapping region described later) configured by only one first substrate located at the shortest distance. As shown in FIG. 9A, there is a problem that a substrate crack (that is, a glass crack) occurs in the non-overlapping portion of the first substrate 1.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a technique capable of improving the resistance to vibration impact in a display device having a hybrid panel structure. There is to do.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
(1) A display panel having a first substrate and a second substrate, a mold for housing the display panel, an upper polarizing plate disposed on an observer-side surface of the second substrate, and the upper polarization The front panel is arranged on the viewer side of the plate, and the peripheral portions of the four sides of the first substrate are fixed to the mold by a double-sided tape, and the planar size of the front panel is the mold A display device in which the front panel is fixed to a housing, wherein the first substrate has a non-overlapping region that does not overlap with the second substrate, and the mold is formed on the first substrate. It has at least one protrusion on a side located outside one side of the non-overlapping region, the at least one protrusion of the mold is fixed to the housing, and the double-sided tape is the at least 1 Opposite protrusions Having a recess in a portion, between the said mold first substrate, the recess formed region of the double-sided tape, a gap is formed.

(2) In (1), the distance between the side surface of the at least one protrusion of the mold and the side of the concave portion of the double-sided tape is 0.2 mm or more and 1.0 mm or less.
(3) In (1), the distance between the bottom of the concave portion of the double-sided tape and the first substrate is not less than 0.2 mm and not more than 0.7 mm.
(4) In (1), two protrusions are formed on a side located outside the one side of the non-overlapping region of the first substrate of the mold.
(5) In (1), a semiconductor chip is mounted in the non-overlapping region of the first substrate.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
ADVANTAGE OF THE INVENTION According to this invention, in the display apparatus of a hybrid panel structure, it becomes possible to improve the tolerance with respect to a vibration impact.

Hereinafter, embodiments in which the present invention is applied to a liquid crystal display device will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof is omitted.
[Structure of a liquid crystal display device as a premise of the present invention]
FIG. 4 is a diagram showing the structure of a liquid crystal display device having a hybrid panel structure as a premise of the present invention.
5 and 6 are side views showing a state in which the liquid crystal display device shown in FIG. 1 is mounted on a mobile phone, FIG. 5 is a side view seen from the direction of arrow A in FIG. 4, and FIG. It is the side view seen from the direction of arrow B of 4.
The liquid crystal display device shown in FIG. 4 includes a liquid crystal display panel (LCD), a planar front panel 11 disposed on a viewer-side surface of the liquid crystal display panel (LCD), and observation of the liquid crystal display panel (LCD). A frame-shaped resin mold frame (hereinafter simply referred to as a mold) 10 is provided on the side opposite to the person side to house and support a liquid crystal display panel (LCD).
FIG. 4 is a view as seen from the observer side. The first substrate 1, the second substrate 2, the upper polarizing plate 4, the semiconductor chip (DRV), and the mold 10 are covered with the front panel 11. Although not visible, the front panel 11 is shown as transparent in FIG. 4 so that their arrangement can be better understood.

A liquid crystal display panel (LCD) includes a first substrate 1, a second substrate 2, a liquid crystal layer (not shown) sandwiched between the first substrate 1 and the second substrate 2, and driving A semiconductor chip (DRV) on which a circuit is mounted, a flexible wiring substrate (FPC) connected to at least one side of the first substrate 1, and an upper polarizing plate 4 attached to the second substrate 2 . Here, the side opposite to the liquid crystal layer of the second substrate 2 is the observer side. Although not shown in FIGS. 4 to 6, a lower polarizing plate is attached on the first substrate 1.
As the first and second substrates (1, 2), for example, transparent insulating substrates such as glass are used.
Each of the first and second substrates (1, 2) is formed in a rectangular planar shape having four corners. In this embodiment, for example, a rectangular plane having a long side and a short side. It is formed in a shape. Of the first and second substrates (1, 2), the long side of the first substrate 1 is longer than the long side of the second substrate 2, and the first substrate 1 does not overlap the second substrate 2. It has a configuration having a region (hereinafter referred to as a non-overlapping region). The semiconductor chip (DRV) is mounted in a non-overlapping region on the surface of the first substrate 1 on the liquid crystal layer side.
A thin film transistor, a pixel electrode, and the like are formed on the first substrate 1, and a color filter and the like are formed on the second substrate 2. Here, since the liquid crystal display panel (LCD) of this embodiment is an IPS liquid crystal display panel, the counter electrode is provided on the first substrate 1 side, but in the case of a TN liquid crystal display panel or a VA liquid crystal display panel. The counter electrode is provided on the second substrate 2 side. Reference numeral 7 denotes a reflection sheet. 2, 8, and 9, the reflection sheet 7 is not shown.

The liquid crystal display panel (LCD) is fixed on the mold 10 with a double-sided tape 30.
FIG. 7 is a schematic plan view showing the relationship among the mold 10, the double-sided tape 30, and the first substrate 1 in the liquid crystal display device shown in FIG. 4. In FIG. 7, the thick dotted line indicates the size of the first substrate 1 and the thin dotted line indicates the size of the lower polarizing plate 3 attached on the first substrate.
As shown in FIG. 7, the mold 10 has an opening 15 in the center, and the lower polarizing plate 3 is disposed in the opening 15. The periphery of the opening 15 is a portion for holding the first substrate 1, and the first substrate 1 is fixed to this portion by the double-sided tape 30.
The front panel 11 is bonded and fixed to an upper polarizing plate 4 on a second substrate 2 of a liquid crystal display panel (LCD) through an adhesive 9 having a refractive index equivalent to that of the upper polarizing plate 4. The front panel 11 is formed in a square shape having four corners in plan view.
The planar shape of the front panel 11 is similar to the planar shape of the mold 10, and the contour line (each side) at the outer peripheral edge of the front panel 11 is outside the contour line (each side) at the outer peripheral edge of the mold 10. The front panel 11 has a larger plane size than the mold 10. The front panel 11 is made of, for example, a transparent insulating material such as glass or resin (for example, acrylic).
And, the lower surface of the portion of the four sides of the front panel 11 that is located outside the four sides of the mold 10 that houses and supports the liquid crystal display panel (LCD), and projects outward from the mold 10 of the front panel 11, It is fixed to a housing 20 of a mobile device (for example, a mobile phone) with an adhesive 22 such as a double-sided tape or an adhesive.

FIG. 1 is a diagram illustrating a schematic structure of a mold of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part illustrating a schematic configuration of the liquid crystal display device according to the present embodiment.
As shown in FIG. 1, also in this embodiment, a protrusion 10 </ b> A is provided on a side of the mold 10 that is located outside one side of the non-overlapping region of the first substrate 1. As shown in FIG. 3, in the present embodiment, two protrusions 10 </ b> A are formed on the side of the mold 10 that is located outside one side of the non-overlapping region of the first substrate 1.
In the present embodiment, a recess 30A is formed in a region of the double-sided tape 30 that fixes the first substrate 1 that faces the protruding portion 10A. Therefore, in this embodiment, as shown by an arrow A in FIG. 2, a gap is formed in the region where the concave portion 30A of the double-sided tape 30 is formed between the mold 10 and the first substrate 1. .
Here, the distance (a1 or a2 in FIG. 1) between the side surface of the protrusion 10A of the mold 10 and the side of the recess 30A of the double-sided tape 30 is 0.2 mm or more and 1.0 mm or less. . Moreover, the space | interval (a3 of FIG. 1) between the base of the recessed part 30A of the double-sided tape 30 and the 1st board | substrate 1 shall be 0.2 mm or more and 0.7 mm or less.
Thus, according to the present embodiment, a gap is formed in the region between the mold 10 and the first substrate 1 where the concave portion 30A of the double-sided tape 30 is formed.
Therefore, even if the impact F shown in FIG. 2 is applied and vibration (bending stress) (F in FIG. 2) is transmitted from the protruding portion 10A of the mold 10 to the non-overlapping region of the first substrate, the concave portion 30A of the double-sided tape 30 is Vibration is hardly transmitted by the gap formed in the formed region.
As a result, substrate cracking (that is, glass cracking) in the non-overlapping region of the first substrate 1 of the liquid crystal display device can be suppressed.
In the above-described embodiment, the embodiment in which the present invention is applied to the liquid crystal display device has been described. However, the present invention is not limited to this, and other displays such as an organic EL display panel and an inorganic EL display panel are provided. The present invention can be applied to a display module provided with a panel.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

It is a figure which shows schematic structure of the mold of the liquid crystal display device of the Example of this invention. It is principal part sectional drawing which shows schematic structure of the liquid crystal display device of the Example of this invention. It is a figure which shows the number of the protrusion parts formed in the mold of the liquid crystal display device of the Example of this invention. It is a figure which shows the structure of the liquid crystal display device of the hybrid panel structure used as the premise of this invention. FIG. 5 is a side view showing a state in which the liquid crystal display device shown in FIG. 4 is mounted on a mobile phone (a side view seen from the direction of arrow A in FIG. 4). FIG. 5 is a side view showing a state in which the liquid crystal display device shown in FIG. 4 is mounted on a mobile phone (a side view seen from the direction of arrow B in FIG. 4). FIG. 5 is a schematic plan view showing a relationship among a mold, a double-sided tape, and a first substrate in the liquid crystal display device shown in FIG. 4. It is principal part sectional drawing for demonstrating the liquid crystal display device of the conventional hybrid panel structure. It is principal part sectional drawing for demonstrating the liquid crystal display device which solved the trouble shown in FIG. It is a figure which shows schematic structure of the mold of the liquid crystal display device which solved the trouble shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 2nd board | substrate 3 Lower polarizing plate 4 Upper polarizing plate 7 Reflective sheet 9 Adhesive 10 Resin mold frame 10A Protrusion part 11 Front panel 15 Opening part 20 Housing | casing 22 Double-sided tape or adhesive 30 Double-sided tape 30A Concave part DRV Semiconductor chip FPC Flexible wiring board

Claims (5)

A display panel having a first substrate and a second substrate;
A mold for housing the display panel;
An upper polarizing plate disposed on the viewer-side surface of the second substrate;
Having the front panel disposed on the viewer-side surface of the upper polarizing plate;
The peripheral portions of the four sides of the first substrate are fixed to the mold with a double-sided tape,
The plane size of the front panel is larger than the mold,
A display device in which the front panel unit is fixed to a housing,
The first substrate has a non-overlapping region that does not overlap with the second substrate;
The mold has at least one protrusion on a side located outside of one side of the non-overlapping region of the first substrate,
The at least one protrusion of the mold is fixed to the housing;
The double-sided tape has a recess in a portion facing the at least one protrusion,
A display device, wherein a gap is formed between the mold and the first substrate in a region where the concave portion of the double-sided tape is formed.   The space between the side surface of the at least one protrusion of the mold and the side of the concave portion of the double-sided tape is 0.2 mm or more and 1.0 mm or less. Display device.   2. The display device according to claim 1, wherein a distance between a bottom of the concave portion of the double-sided tape and the first substrate is 0.2 mm or more and 0.7 mm or less.   2. The display device according to claim 1, wherein two protrusions are formed on a side of the mold that is located outside one side of the non-overlapping region of the first substrate.   The display device according to claim 1, wherein a semiconductor chip is mounted in the non-overlapping region of the first substrate.

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