JP2000019535A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent luminance unevenness by holding liquid crystals between the opposite surfaces of two sheets of glass having plural notches at their edges and joining semiconductor chips to the glass portions between the notches on the opposite surfaces of the glass by a thermosetting resin. SOLUTION: The liquid crystals are held between the opposite surfaces of two sheets of the glass 2, 3 having the plural notches at their edges and the semiconductor chips 1 are joined to the glass portions between the notches on the opposite surfaces of the glass 2, 3 by the thermosetting resin. Deflection plates 4 are respectively adhered to the surfaces of the glass 2 and the glass 3 while holding the liquid crystals between the glass 2 and the glass 3. The bumps of the semiconductor chips 1 are respectively connected to the surfaces of the glass 2 and the glass 3 and are fixed by the thermosetting resin. The stresses of the glass 3 are distributed to be increased at the ends of the semiconductor chips 1 by adopting such constitution but since there are no semiconductor chips 1 adjacent to each other, the superposition of the stresses generated by both semiconductor chips 1 does not occur and the occurrence of the luminance unevenness in the glass 2 and the glass 3 is averted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having no luminance unevenness.

[0002]

2. Description of the Related Art An example of a conventional liquid crystal display device is shown in FIG. In the conventional liquid crystal display device, an elongated chip 1 is connected near two sides around a glass 2, and the mutual positions of the chips are arranged such that the chips are arranged in a line in the longitudinal direction. Although this sequence is slightly different from the object of the present invention in the production method, for example,
Supervised by Honda, Multi-chip mounting technology, 1991,
It is used in the liquid crystal display device shown in Photo 4 on page 319 issued by Trikeps Corporation. The polarizing plate 4a and the glass 3 are bonded to both surfaces of the glass 2. In order to show the structure more clearly, a cross section along line 5 is shown in FIG.

In FIG. 3, a liquid crystal 8 is held between glass 2 and glass 3, and polarizing plates 4a and 4b are adhered to the surface of the glass. On the surface of glass 2, bump 6 of chip 1
Are connected and fixed with a thermosetting adhesive 7. The method of connecting the chip 1 is a method in which a heated jig is pressed against the chip 1 and the thermosetting adhesive 7 is thermoset.

[0004] This connection method is shown, for example, in FIG. 12 on page 291 of Honda Supervision, Multi-Chip Mounting Technology, published by Trikeps Corporation in 1991. Since the chip 1 thermally shrinks in a cooling process after the adhesive is cured, the chip 1 generates stress on the glass 2. FIGS. 4A and 4B are enlarged views of the chip connecting portion of FIG. The stress of the glass has an increasing distribution at the edge of the chip. As shown in FIGS. 4A and 4B, when the ends of adjacent chips are close to each other, the stress generated by both chips is superimposed, and the stress further increases at the portion 9.

Returning to FIG. 3, the function of the liquid crystal display will be described. The light radiated from the upper part of FIG. 3 passes through the polarizing plate 4a and becomes polarized. Then, when passing through the liquid crystal, the polarization plane changes according to the optical axis of the liquid crystal changed according to the driving signal of the chip. Since the lower polarizing plate 4b is orthogonal to the upper polarizing plate 4a,
Without a drive signal, the display remains dark, and the greater the change in the plane of polarization due to the liquid crystal, the higher the brightness of the display.

Referring again to FIGS. 4 (a) and 4 (b). As described above, when a portion 9 having high stress occurs in the glass, the polarization plane of polarized light passing through the glass changes due to the photoelastic effect of the glass. Therefore, a bright portion is formed in the portion 10 even when there is no drive signal for the chip. This is called luminance unevenness.

[0007]

It is necessary to prevent luminance unevenness in order to make an actual image unclear. An object of the present invention is to prevent such uneven brightness.

[0008]

SUMMARY OF THE INVENTION The above object is achieved by reducing the stress generated on the glass by the chip. In particular, the stress of glass increases due to the superposition of stress when the distance between adjacent chip ends is small. For this reason, stress can be reduced by increasing the interval between the ends of adjacent chips. For this purpose, there is a trivial method such as using a chip having a short length and widening the interval between chips. However, this requires an increase in the degree of integration of the chip, which is not easy.

In the present invention, a method has been found in which the same chip as in the prior art is used, and the shape of the glass is made unconventional.

According to this method, a liquid crystal is held between opposing surfaces of two pieces of glass having a plurality of notches on an edge, and a semiconductor chip is placed on a glass portion between the notches on the opposing surface of the glass with a thermosetting resin. This reduces the stress generated in the glass of each chip and prevents uneven brightness of the liquid crystal display device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a liquid crystal display device according to the present invention will be described below with reference to FIG. The liquid crystal display device of the present invention holds the liquid crystal between the opposing surfaces of two glasses 2 and 3 having a plurality of cuts at the edges, and places the semiconductor chip 1 on the glass portion between the cuts on the opposing surfaces of the glass. Joined with thermosetting resin. A polarizing plate 4a is adhered to the glass 2. FIG. 5 shows a view from the back side of FIG. FIG. 5 shows a state where another chip is connected. FIGS. 6A and 6B show cross sections along lines 5a and 5b in order to more clearly show the structure.

In FIGS. 6A and 6B, the glass 2 and the glass 3 are shown.
The liquid crystal 8 is held between them, and the polarizing plate 4
a and 4b are adhered. In FIG. 6A, the bumps 6 of the chip 1 are connected to the surface of the glass 2 and fixed with a thermosetting adhesive 7. In FIG. 6B, the bumps 6 of the chip 1 are connected to the surface of the glass 3 and fixed with a thermosetting adhesive 7.

FIGS. 7A and 7B are enlarged views of the chip connecting portion of FIG. The stress of the glass has a distribution that increases at the end 9 of the chip, but since there are no adjacent chips, the stress generated by both chips does not overlap. There is no brightness unevenness in the glass.

[0014]

According to the present invention, the stress generated in the glass by the chip can be reduced, and the luminance unevenness of the glass can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view of a conventional liquid crystal display device.

FIG. 3 is a partially enlarged sectional view of a liquid crystal display device according to one embodiment of the present invention.

FIGS. 4A and 4B are a plan view and a front view showing luminance unevenness of a conventional liquid crystal display device.

FIG. 5 is a plan view showing the back side of FIG. 1 of the liquid crystal display device according to one embodiment of the present invention.

FIGS. 6A and 6B are partially enlarged sectional views of a liquid crystal display device according to an embodiment of the present invention.

FIGS. 7A and 7B are a plan view and a front view showing a stress generation position of the liquid crystal display device according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Semiconductor chip, 2, 3 ... Glass, 4a, 4b ... Polarizing plate, 5a, 5b ... Line, 6 ... Bump, 7 ... Thermosetting resin, 8
... liquid crystal, 9 ... stress generation part, 10 ... luminance unevenness part.

Claims (1)

[Claims] 1. A liquid crystal is held between opposing surfaces of two glasses having a plurality of cuts on an edge, and a semiconductor chip is bonded to a glass portion between the cuts on the opposing surfaces of the glass with a thermosetting resin. Liquid crystal display device.