JP2010060704A - Display - Google Patents

Abstract

In a display device having a hybrid panel structure, resistance against point load and vibration stress is improved.
A display panel having a first substrate and a second substrate, a mold for housing the display panel, a lower frame disposed under the mold, and an observer side of the second substrate An upper polarizing plate disposed on a surface, and the front panel disposed on a viewer-side surface of the upper polarizing plate, wherein a planar size of the front panel is larger than the mold, and the front panel However, the first substrate has a non-overlapping region that does not overlap with the second substrate, and the lower frame is positioned outside at least one side of the non-overlapping region of the first substrate. The tip of the portion to be fixed is fixed to the housing, and there is a gap between the mold and the lower frame, and the gap is located outside one side of the non-overlapping region of the first substrate of the mold. Front from the tip It provided until the end of the upper frame.
[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. 9 is a plan view of a liquid crystal display device having a hybrid panel structure examined prior to the present invention, and FIG. 10 is a side view of the liquid crystal display device having a hybrid panel structure shown in FIG.
9 and 10, 1 is a first substrate, 2 is a second substrate, 4 is an upper polarizing plate, DRV is a semiconductor chip, FPC is a flexible wiring substrate, 10 is a mold, and 11 is a front panel.
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.
FIG. 9 is a view 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 illustrated as being transparent in FIG. 9 so that their arrangement can be better understood.
FIG. 11 is a diagram illustrating a state in which the liquid crystal display device illustrated in FIGS. 9 and 10 is attached to a housing.
In FIG. 11, the lower surface of the four sides of the front panel 11 (only one side is shown in FIG. 11) that protrudes outward from the mold 10 of the front panel 11 is a housing of a mobile device (for example, a mobile phone). For example, the body 20 is fixed with an adhesive 22 such as a double-sided tape or an adhesive.
A lower frame 12 is disposed below the mold 10 with no gap between the mold 10 and the front end portion 12A of the lower frame is fixed to the casing.

In the case of the above-described liquid crystal display device shown in FIG. 11, as shown in FIG. 11, a space (a space indicated by an arrow A in FIG. 11) is formed on a semiconductor chip (DRV) or a flexible wiring board (FPC) constituting the driver circuit. ).
Therefore, as shown in FIG. 12, when a point load (static load, drop load) F shown in FIG. 12 is applied to this space from the facing side of the front panel 11, as shown by an arrow A in FIG. There is a problem that stress concentrates on the boundary between the first substrate 1 and the second substrate 2 to cause glass breakage.
In order to solve the above-mentioned problem, as shown in FIG. 13, the lower frame 12 disposed on the lower side of the mold 10 is removed, or the lower frame is disposed at a distance on the lower side of the mold 10, By providing a space (a space indicated by an arrow A in FIG. 13) on the lower side of the mold 10, the bending to the boundary between the first substrate 1 and the second substrate 2 indicated by the arrow A in FIG. It is possible to escape and prevent glass breakage.
However, in the structure shown in FIG. 13, the portion that supports the liquid crystal display device is only the fixed portion of the front panel 11 (the others are free), and therefore when vibration stress is applied instead of point load, it is shown in S of FIG. 14. Thus, the liquid crystal display device vibrates in the vertical direction.
This vibration is transmitted to the interface between the front panel 11 and the upper polarizing plate 4, and it is assumed that the adhesive 9 is peeled off from the end of the upper polarizing plate 4. The peeling off of the adhesive 9 has a problem that the display quality of the display image displayed on the liquid crystal display panel (LCD) is deteriorated.
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 improve resistance to point load and vibration stress in a display device having a hybrid panel structure. To provide technology.
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, a lower frame disposed on the lower side of the mold, and an observer-side surface of the second substrate An upper polarizing plate disposed on the front panel, and the front panel disposed on an observer-side surface of the upper polarizing plate, the planar size of the front panel being larger than the mold; The display device is fixed to a housing, wherein the first substrate has a non-overlapping region that does not overlap with the second substrate, and the lower frame has at least one side of the non-overlapping region of the first substrate. The tip of the portion located on the outer side is fixed to the housing, and there is a gap between the mold and the lower frame, and the gap is the area of the non-overlapping region of the first substrate of the mold. Located outside one side It is provided between from end to end of the upper frame.
(2) In (1), the gap is from a tip portion located outside one side of the non-overlapping region of the first substrate of the mold to a position 1.0 mm inside from an end portion of the upper frame. Between.
(3) In (1) or (2), the gap is 0.1 mm or more and 1.0 mm or less.

(4) In any one of (1) to (3), the gap is formed by a stepped portion formed in the mold.
(5) In any one of (1) to (3), the gap is formed by a step portion formed in the lower frame.
(6) In any one of (1) to (3), a planar shape that is disposed between the mold and the lower frame is smaller than that of the mold or the lower frame, and the gap is The spacer is formed at a portion not in contact with the mold and the lower frame.
(7) In any one of (1) to (6), the lower frame is a portion located outside two sides of one side of the non-overlapping region of the first substrate and a side facing the one side. The tip is fixed to the housing.
(8) In any one of (1) to (7), a semiconductor chip is mounted in the non-overlapping region of the first substrate.
(9) In (8), a flexible wiring substrate is connected to one side of 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 yield strength with respect to a point load and a vibration stress.

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. 6 is a diagram showing a structure of a liquid crystal display device as a premise of the present invention.
7 and 8 are side views showing a state in which the liquid crystal display device shown in FIG. 1 is mounted on a mobile phone, FIG. 7 is a side view seen from the direction of arrow A in FIG. 6, and FIG. It is the side view seen from the direction of arrow B of 6.
The liquid crystal display device shown in FIG. 6 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 frame) 10 is provided on the side opposite to the person side to house and support a liquid crystal display panel (LCD).
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 board (FPC) connected to at least one side of the first substrate 1, and an upper polarizing plate 4 attached to the second substrate 2 are provided. is doing. Here, the side opposite to the liquid crystal layer of the second substrate 2 is the observer side. Although not shown in FIGS. 6 to 8, 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 planar shape having a long side and a short side is used. Is formed. 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.

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 lines (each side) at the outer peripheral edge of the front panel 11 are outside the contour lines (each side) at the outer peripheral edge of the mold 10. The position, that is, the front panel 11 has a larger planar 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.

[Example 1]
FIG. 1 is a cross-sectional view showing the schematic structure of a liquid crystal display device according to Embodiment 1 of the present invention.
As shown in FIG. 1, in this embodiment, a lower frame 12 is disposed on the lower side of the mold 10, and a front end portion 12 </ b> A of the lower frame is fixed to the housing. The lower frame 12 may be fixed to the housing at the tip portions of the four sides, but at least the tip portion 12A shown in FIG. 1 or the tip portion 12A shown in FIG. 1 and the tip portion 12A are opposed to each other. Only the tip of the side to be fixed may be fixed to the housing.
As shown in FIG. 1, in this embodiment, from the end of the mold 10 (position indicated by the solid line in FIG. 1) to the end of the upper polarizing plate 4 (position indicated by the broken line in FIG. 1) A step portion 30 a is provided, and a gap 31 is formed between the mold 10 and the lower frame 12. In this case, there is no gap in the lower part of the mold 10 in the inner region from the end of the upper polarizing plate 4.
Here, the value of the gap 31 is set to 0.1 mm or more and 1.0 mm or less. Further, the step portion 30a formed in the mold 10 is formed from the end portion of the mold 10 (position indicated by the solid line in FIG. 1) to the end portion of the upper polarizing plate 4 (position indicated by the broken line in FIG. 1). As a position (a position indicated by an alternate long and short dash line in FIG. 1) from an end of the mold 10 (a position indicated by a solid line in FIG. 1) to 1.0 mm from an end (a position indicated by a broken line in FIG. 1) of the upper polarizing plate 4 Also good.
As a result, as will be described later, in this embodiment, it is possible to improve the resistance to point loads and vibration stress.

[Example 2]
FIG. 2 is a cross-sectional view showing the schematic structure of a liquid crystal display device according to Embodiment 2 of the present invention.
As shown in FIG. 2, in this embodiment, the lower frame 12 extends from the end of the lower frame 12 (position indicated by the solid line in FIG. 2) to the end of the upper polarizing plate 4 (position indicated by the broken line in FIG. 2). A step portion 30 b is provided on the upper surface, and a gap 31 is formed between the mold 10 and the lower frame 12. In this case, there is no gap in the lower part of the mold 10 in the inner region from the end of the upper polarizing plate 4.
Here, the value of the gap 31 is set to 0.1 mm or more and 1.0 mm or less. Further, the step portion 30b formed on the lower frame 12 is not formed from the end portion of the lower frame 12 (position indicated by the solid line in FIG. 2) to the end portion of the upper polarizing plate 4 (position indicated by the broken line in FIG. 2). Further, a position (shown by a one-dot chain line in FIG. 2) from the end of the lower frame 12 (position shown by a solid line in FIG. 2) to the end of the upper polarizing plate 4 (position shown by a broken line in FIG. 2). Position).
When a point load (static load, drop load) F is applied to the position shown in FIG. 4, in this embodiment, the step portion 30 b formed on the lower frame 12 with the position of the end portion of the upper polarizing plate 4 as a guide. Since the first substrate 1 can be bent downward as a fulcrum, stress can be released.
Therefore, as shown by the arrow A in FIG. 12 described above, the stress is concentrated on the boundary portion between the first substrate 1 and the second substrate 2 to solve the problem that the substrate crack (glass crack) occurs. Substrate cracking that occurs at the boundary between the first substrate 1 and the second substrate 2 can be suppressed.
Further, in this embodiment, even if vibration stress is applied instead of a point load, the lower portion of the mold 10 in the inner region is made free from gaps with the end portion of the upper polarizing plate 4 as a guideline. As shown in FIG. 2, the liquid crystal display device is swung upward, but is not swung downward.
Therefore, since vibration transmitted to the interface between the front panel 11 and the upper polarizing plate 4 can be reduced, it is possible to prevent the adhesive 9 from being peeled off from the end of the upper polarizing plate 4. Thereby, the subject that the display quality of the display image displayed on a liquid crystal display panel (LCD) is reduced can be solved.

[Example 3]
FIG. 3 is a cross-sectional view showing the schematic structure of a liquid crystal display device according to Embodiment 3 of the present invention.
As shown in FIG. 3, in this embodiment, a gap 31 is formed by arranging a spacer 33 between the mold 10 and the lower frame 12.
That is, in this embodiment, the planar shape of the spacer 33 is made smaller than the planar shape of the mold 10 and the planar shape of the lower frame 12, and the spacer 30 is not disposed between the mold 10 and the lower frame 12. The part is a gap.
Also in the present embodiment, as in the second embodiment, it is possible to improve the proof strength against point load and vibration stress.
As described above, in this embodiment, the stress concentrates on the boundary between the first substrate 1 and the second substrate 2 to cause a substrate crack (glass crack), and the vibration stress is caused by the front panel 11. As a result, the problem of peeling off the adhesive 9 from the end of the upper polarizing plate 4 can be solved.
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 principal part sectional drawing which shows schematic structure of the liquid crystal display device of Example 1 of this invention. It is principal part sectional drawing which shows schematic structure of the liquid crystal display device of Example 2 of this invention. It is principal part sectional drawing which shows schematic structure of the liquid crystal display device of Example 3 of this invention. It is a figure for demonstrating that the subject of a prior art example can be solved in the liquid crystal display device of Example 2 of this invention. It is a figure for demonstrating that the subject of a prior art example can be solved in the liquid crystal display device of Example 2 of this invention. It is a figure which shows the structure of the liquid crystal display device used as the premise of this invention. FIG. 7 is a side view showing a state in which the liquid crystal display device shown in FIG. 6 is mounted on a mobile phone (a side view seen from the direction of arrow A in FIG. 1). It is a side view (side view seen from the direction of arrow B of FIG. 1) which shows the state which mounted the liquid crystal display device shown in FIG. 6 in the mobile telephone. It is a top view of the liquid crystal display device of the hybrid panel structure examined prior to this invention. FIG. 10 is a side view of the liquid crystal display device having a hybrid panel structure shown in FIG. 9. It is principal part sectional drawing which shows the state which attached the liquid crystal display device shown in FIG. 9, FIG. 10 to the housing | casing. It is principal part sectional drawing for demonstrating the problem of the liquid crystal display device shown in FIG. It is principal part sectional drawing which shows the liquid crystal display device which solved the trouble shown in FIG. It is principal part sectional drawing for demonstrating the problem of the liquid crystal display device shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 2nd board | substrate 4 Upper polarizing plate 7 Reflective sheet 9 Adhesive 10 Resin mold frame 11 Front panel 12 Lower frame 12A Tip part 20 Case 22 Double-sided tape or adhesive 30a, 30b Step part 31 Gap 33 Spacer LCD Liquid crystal display panel DRV Semiconductor chip FPC Flexible wiring board

Claims (9)

A display panel having a first substrate and a second substrate;
A mold for housing the display panel;
A lower frame disposed under the mold;
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 plane size of the front panel is larger than the mold,
The front panel is a display device fixed to a housing,
The first substrate has a non-overlapping region that does not overlap with the second substrate;
In the lower frame, at least a tip portion of a portion positioned outside one side of the non-overlapping region of the first substrate is fixed to the housing.
Having a gap between the mold and the lower frame,
The display device according to claim 1, wherein the gap is provided between a tip portion located outside a side of the non-overlapping region of the first substrate of the mold and an end portion of the upper frame.   The gap is provided between a tip portion positioned outside one side of the non-overlapping region of the first substrate of the mold and a position 1.0 mm inside from an end portion of the upper frame. The display device according to claim 1.   The display device according to claim 1, wherein the gap is 0.1 mm to 1.0 mm.   The display device according to claim 1, wherein the gap is formed by a step portion formed in the mold.   The display device according to claim 1, wherein the gap is formed by a step portion formed in the lower frame. The planar shape is arranged between the mold and the lower frame, and has a spacer smaller than the mold or the lower frame,
The display device according to claim 1, wherein the gap is formed at a portion of the spacer that does not contact the mold and the lower frame.   In the lower frame, one end of the non-overlapping region of the first substrate and a tip portion of a portion located outside the two sides opposite to the one side are fixed to the casing. The display device according to claim 1.   The display device according to claim 1, wherein a semiconductor chip is mounted on the non-overlapping region of the first substrate.   The display device according to claim 8, wherein a flexible wiring substrate is connected to one side of the non-overlapping region of the first substrate.

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