JPH0627988B2 - Liquid crystal display - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device which uses a twisted nematic type (hereinafter referred to as TN) liquid crystal display element to perform fixed pattern display by transmitted light.

[Background of the Invention]

FIG. 1 is a cross-sectional view of the essential parts showing an example of a conventional liquid crystal display device in which a fixed display pattern portion is provided in a TN liquid crystal display element. In the figure, the liquid crystal display element 1 has two translucent electrode substrates 4 and 5 each having a translucent segment electrode 2 and a common electrode 3 formed on the opposite surfaces thereof, which are opposed to each other, and a peripheral portion thereof is provided with a sealing material 6. And the twisted nematic liquid crystal 7 having a twisted structure is sealed between the substrates 4 and 5.

Further, on the outer surface of the liquid crystal display element 1, that is, on both electrode substrates 4 and 5, an upper plate polarizing plate 9 and a lower plate polarizing plate 10 have their polarization axes or light absorption axes parallel to each other via a translucent adhesive 8. Then, each of them is bonded and arranged, and further, an antireflection sheet 11 is bonded and arranged on the upper plate polarizing plate 9 with a translucent adhesive 8 interposed therebetween. In this case, in particular, as the lower plate polarizing plate 10, for example, a polarizing plate with a white frame-shaped pattern in which the degree of polarization is selectively reduced is used. A liquid crystal display device is configured by arranging and arranging a fixed display pattern 12 in which a frame is printed on the frame-shaped pattern, for example, in black on the lower plate polarizing plate 10 and is printed in color.

In such a configuration, by arranging the multicolor filter 13 on the back side of the liquid crystal display device, that is, the lower plate polarizing plate 10 and turning on the illumination light source 14 on the back side thereof, the multicolor filter 13 is transmitted and colored. The fixed pattern of was displayed.

However, since the fixed display pattern thus displayed is displayed by the illumination light source 14 arranged on the back side of the liquid crystal display device, the fixed display pattern disappears completely when the light source 14 is turned off. Therefore, when used as an instrument panel for vehicles, there was a problem that the display could not be clearly seen as compared with the display by the current mechanical meter. Further, there is a problem that a clear color fixed display pattern cannot be obtained.

[Object of the Invention]

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a liquid crystal display device capable of obtaining a color fixed display pattern with high display quality.

[Outline of Invention]

In order to achieve such an object, the present invention provides a fixed display pattern between a liquid crystal display element and an antireflection sheet.

Example of Invention

 Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a cross-sectional configuration diagram of an essential part showing an embodiment of the liquid crystal display device according to the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals. In the figure, a fixed display pattern 15 formed by color printing is arranged on the upper plate polarizing plate 9 on the observer side of the liquid crystal display element 1, and a thickness of 40 to 90 μm is provided on the upper surface thereof.
An antireflection sheet 11 is fixedly arranged via a translucent adhesive 8 of about m. In this case, the thickness of the translucent adhesive 8 was about 20 μm in the past, but the maximum thickness of the fixed display pattern 15 formed by printing is about 30 μm. Therefore, when the antireflection sheet 11 is attached, The thickness of the translucent adhesive 8 should be 40
By setting the thickness to about 90 μm, the above-mentioned generation of bubbles is prevented.

FIG. 3 is a cross-sectional view of a main part showing another embodiment of the liquid crystal display device according to the present invention, and the same parts as those in FIG. 1 are designated by the same reference numerals. 2 is different from FIG. 2 in that a fixed display pattern 15 formed by color printing is arranged on the upper transparent electrode substrate 3 on the viewer side of the liquid crystal display element 1, and the upper surface of the fixed display pattern 15 is further arranged. In the same manner as above, the upper plate polarizing plate 9 is adhesively arranged via the translucent adhesive 8 having a thickness of about 40 to 90 μm,
Further, an antireflection sheet 11 is adhered and arranged on the upper surface of the translucent pressure sensitive adhesive 8.

According to such a configuration, the fixed display pattern 15 is arranged on the observer side of the liquid crystal display element 1, so that the illumination light source 14 from the rear side of the liquid crystal display element 1 is unnecessary and the fixed display pattern 15 can be observed. It can be done clearly.

〔The invention's effect〕

As described above, according to the present invention, there is an extremely excellent effect that a colored fixed display pattern having high display quality can be obtained with an extremely simple configuration even without an illumination light source.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of an essential part of a conventional liquid crystal display device, FIG. 2 is a sectional view of the essential part of an embodiment of the liquid crystal display device according to the present invention, and FIG. 3 is another embodiment of the present invention. It is a principal part cross-section block diagram which shows an example. 1 ... Liquid crystal display element, 2 ... Segment electrode, 3 ... Common electrode, 4, 5 ... Translucent electrode substrate, 6 ... Sealing material, 7 ... Nematic liquid crystal, 8 ... Translucent adhesive Agent, 9
...... Upper polarizing plate, 10 ...... Lower polarizing plate, 11 ...... Antireflection sheet, 12 ...... Colored fixed display pattern, 13 ...... Multicolor filter, 14 ...... Illumination light source, 15 ...... Colored fixed display pattern.

Claims (3)

[Claims] 1. A liquid crystal display device having a twisted nematic liquid crystal enclosed between a pair of upper and lower translucent substrates having translucent electrodes on opposite surfaces, and absorption axes on both outer surfaces of the liquid crystal display device. A liquid crystal display device comprising a pair of upper and lower polarizing plates arranged in parallel with each other, and an antireflection sheet disposed on the outer surface of the upper polarizing plate, wherein the liquid crystal display element and the antireflection film are provided. By disposing a colored fixed display pattern between the sheet and a translucent adhesive having a film thickness thicker than the colored fixed display pattern is provided around the colored fixed display pattern, A liquid crystal display device characterized in that bubbles are prevented from being generated in the adhesive. 2. The liquid crystal display device according to claim 1, wherein the fixed color display pattern is arranged between the upper polarizing plate and the antireflection sheet. 3. The liquid crystal display device according to claim 1, wherein the fixed color display pattern is arranged between the upper light-transmissive substrate of the liquid crystal display element and the upper plate polarizing plate. .