JPH0614193Y2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid crystal display device having an improved liquid crystal panel illumination structure.

[Outline of the proposal]

The present invention provides a structure in which the surfaces of a liquid crystal panel and a circuit board on which a self-luminous element that drives the liquid crystal panel and illuminates the liquid crystal panel are mounted are arranged at a substantially vertical angle.
The self-luminous element is supported, fixed and positioned by a part of the frame that fixes the liquid crystal panel, reflector and circuit board, which simplifies the structure, improves assembly workability, and ensures the positioning of the self-luminous element. In addition, the illumination efficiency of the self-luminous element is improved and the reliability is improved.

[Conventional technology]

When illuminating a liquid crystal panel such that the surfaces of the liquid crystal panel and the circuit board that drives the liquid crystal panel form a substantially vertical angle, conventionally, as shown in FIG. 5, the lead is simply placed in an insulating tube. Self-luminous element 1 with wires inserted
Is connected to the circuit board 5 and brought close to the side surface of the reflection plate 2 after assembly, and is further adhered and fixed together with the frame with the adhesive tape 9 or incorporated into the reflection plate 2 formed by injection molding as shown in FIG. It had a structure like. 5 and 6, the liquid crystal panel is arranged on the opposite side of the frame 6 in the direction perpendicular to the circuit board 5.

[Problems to be solved by the invention]

However, in the conventional structure as shown in FIG. 5 described above, the positions of the self-emission elements with respect to the liquid crystal panel and the reflection plate are uncertain, and the self-emission elements 1 are not aligned in the same position after assembly, resulting in individual variations. Therefore, with respect to the illumination of the liquid crystal panel, one side has a bright side on the display surface and another side has a bright side on the other side. There was a problem that there was unevenness.

Further, in the structure shown in FIG. 6 described above, the reflection plate must be injection-molded, and since the reflection plate after molding has poor reflection efficiency of illumination, metal vapor deposition is performed except for the portion in contact with the back surface of the liquid crystal panel. Secondary work is required to improve the reflection efficiency by applying paint or painting, resulting in a significant increase in cost. The unevenness of the brightness of the display surface of the liquid crystal panel due to the uncertainty of the position of the self-luminous element 1 in FIG. 5 remains as a problem.

Moreover, a problem common to both is that the electrode lead wires of the self-luminous element come into contact with each other to cause a short circuit. In order to prevent this, it is necessary to cover at least one of the electrode lead wires with the insulating tube 10, resulting in an increase in the number of parts and man-hours, and further in cost.

Further, since the self-luminous element is not securely fixed and supported, the self-luminous element 1 is apt to be displaced due to a drop or impact. There was a problem that there was a big difference in lighting.

Therefore, the present invention solves such a problem,
The purpose is to secure the positioning of the self-luminous element, to fix and support it, and to prevent short circuit between the electrode lead wires, without adding any other parts, and with good assembling workability. It is to realize the lighting of the liquid crystal panel which is stable in quality at the cost.

[Means for solving problems]

A liquid crystal display device according to the present invention comprises a liquid crystal panel (3), a reflector (2) installed on the back side of the display surface of the liquid crystal panel, a circuit board (5) for driving the liquid crystal panel, and the liquid crystal. A liquid crystal display device comprising: a frame (6) for fixedly installing a panel and the circuit board; and a self-luminous element (1) for illuminating the liquid crystal panel from the back side of the liquid crystal panel, wherein Protruding from the frame in the same direction as the liquid crystal panel, and a notched side wall part (6
It is characterized in that a projection (8) for sandwiching the self-luminous element is provided between the projection (8) and (d).

Further, a pair of lead wires (1
A) is characterized in that it is connected to the circuit board from both sides of the protrusion, respectively.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a sectional view of a fixing portion and a supporting portion of the self-luminous element in FIG. 1, and FIG. 3 is a rear view of a liquid crystal panel display surface in FIG. is there. In the figure, a reflection plate 2, a liquid crystal panel 3, and a connector 4 for transmitting a signal for driving the liquid crystal panel are provided on a vertical surface of a frame 6.
Is assembled and fixed by the panel retainer 7. A circuit board 5 is mounted on the other surface of the frame that forms an angle substantially perpendicular to the surface on which the reflection plate 2 and the liquid crystal panel 3 are mounted. The notch 6 in which the side surface 2a of the reflector is exposed on the surface 6b on the back side of the liquid crystal panel display surface 6a of the frame.
c, which is a protrusion 8 formed in the same manner as the frame.
There is. The self-luminous element 1 is sandwiched between the protrusion and the side wall 6d of the frame of the cutout portion to be fixed and supported.

As shown in the figure, the protrusion 8 is formed so that its tip is tapered or has a pyramid shape so as to protrude between the electrode lead wires 1a of the self-luminous element mounted on the circuit board in a plane direction. The electrode lead wires are incorporated on both sides of the protrusion for ease of picking up. As a result, the self-luminous element can be easily assembled, and the problem of short circuit between the electrode lead wires can be solved without using other parts.

Further, it is preferable that the protrusion has a flat plate shape as shown in the drawing. A flat plate-shaped cantilever spring, which is a surface 8a that contacts the self-luminous element.
By having a taper, the self-luminous element is pressed by a certain amount of force from the top after incorporating the self-luminous element, and the protrusion is slightly bent, so that the self-luminous element is securely fixed.
You can support it. The protrusions may be shaped like a quadrangular pyramid that tapers overall. By thickening the root of the projection, strength as a projection is obtained, and in the case of a plastic frame, it also serves as a draft taper at the time of injection molding. When the projection is formed into a columnar shape or a conical shape, for example, the amount of light emitted from the self-luminous element leaks to the back surface of the liquid crystal panel, and the light cannot be efficiently guided to the side surface 2a of the reflection plate. . Considering this point, it is desirable that the projection on the flat plate is larger than the projected area of the self-luminous element.

Further, when considering the improvement of the illumination efficiency of the self-luminous element, it is important to provide a wall because it may be guided to the side surface 6e of the frame.

In this manner, the spring-like projection 8 having a flat-plate taper on a part of the frame ensures positioning of the self-luminous element in the left-right direction and the depth direction of the liquid crystal panel and the reflection plate. The brightness and the variation of the display surface are reduced, and the self-luminous element is firmly fixed and supported.

Further, as shown in FIG. 4, by providing ribs 6f from the frame, the self-luminous element is pressed every time, and the positioning in the height direction is further ensured.

[Effect of device]

As described above, the present invention does not use a special component for fixing the self-luminous element, but uses the protrusion integrated with the frame for fixing and supporting the liquid crystal panel and the circuit board for driving the liquid crystal panel. It can be carried out. As a result, the self-luminous element can be easily positioned, fixed, and supported easily, assembly workability is improved, and a special component is not used for short-circuiting the electrode lead wires of the self-luminous element without using special parts. It is also possible to provide a stable quality product in which the lighting efficiency of the liquid crystal panel of the self-luminous element is further improved and the brightness of the lighting is the same individually without any consideration.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a liquid crystal panel illumination structure of the present invention. FIG. 2 is a sectional view of the self-luminous element portion in FIG. FIG. 3 is a rear view of the display surface of the liquid crystal panel in FIG. FIG. 4 is a view showing another embodiment of the present invention. 5 and 6 are views showing a conventional method. 1 ... Self-luminous element, 2 ... Reflector 3 ... Liquid crystal panel, 5 ... Circuit board 6 ... Frame, 8 ... Protrusion 9 ... Tape for fixing self-luminous element 10 ... Insulation tube

Claims (2)

[Scope of utility model registration request] 1. A liquid crystal panel, a reflector installed on the back side of the display surface of the liquid crystal panel, a circuit board for driving the liquid crystal panel, and a frame for fixedly installing the liquid crystal panel and the circuit board. A liquid crystal display device including a self-luminous element that illuminates the liquid crystal panel from the side of the back surface of the liquid crystal panel, wherein a side portion of the reflector is projected from the frame in the same direction as the liquid crystal panel, and the frame is cut off. A liquid crystal display device, characterized in that a protrusion for sandwiching the self-luminous element is provided between the notch side wall portion. 2. The liquid crystal display device according to claim 1, wherein a pair of lead wires connected to the self-luminous element are connected to the circuit board from both sides of the protrusion, respectively. .