JPH10142576A - Liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display element whose function display panel can accurately be recognized even in a dark place, in the liquid crystal display element in which a touch panel is overlaid on a liquid crystal display panel of a negative display provided with a function display panel. SOLUTION: This element consists of a negative type liquid crystal display panel 10 and a touch panel 30 provided on the front face of the liquid crystal display panel 10, and selects a function display panel 21 of the liquid crystal display panel 10 on the touch panel 30. Optically transmissive member 22 is provided between two sheets of nonconductive transparent substrates 11 and 12 of the liquid crystal display panels 10 in the neighborhood of the function display panel 21 of the liquid crystal display panel 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device in which a touch panel is provided on the surface of a negative type liquid crystal display panel, and a function display section of the liquid crystal display panel is selected by the touch panel. More specifically, the present invention relates to a liquid crystal display element that makes it easy to recognize a function display section even in a dark place.

[0002]

2. Description of the Related Art In recent years, with the development of liquid crystal display elements, electronic devices for displaying each function by a liquid crystal display panel and selecting a desired function by a touch panel provided on the surface thereof have been used in various fields. I have.

For example, when a radio station can receive broadcasts from AM broadcast stations and FM broadcast stations, as shown in FIG. 2, an example of a display surface thereof is provided, and a function display section 1 of each broadcast station can be selected. AM1, AM2, AM3, AM4,
FM1, FM2, FM3, and FM4 are provided, and V is used as a function display section 1 of a volume for selecting a volume.
1, V2, V3, V4, V5, etc. are provided. Then, for example, when the part of AM3 is pressed, tuning is performed so that the broadcast of the broadcast station can be received.
Is illuminated and displayed, and the frequency is displayed on the segment display section 2. Also, the volume of the radio can be set to a medium volume by pressing the function display unit 1 of the volume of V3, for example, and can be set to a small volume by pressing V1, and adjusted to the volume corresponding to the display unit. This is displayed on the function display section 1 of the volume. As described above, by selecting the function display section 1 according to the preference, the user can receive the desired broadcast in a desired state, and the contents are displayed on the liquid crystal display panel.

[0004] For the liquid crystal display panel, a negative display in which the background is black (dark color) and only the display portion is displayed in white or color is often used for good visibility and colorization. When such a negative display liquid crystal display panel is provided with the above-mentioned function display section, the color filter is usually provided in the function display section, and in a dark place, incomplete light blocking by the liquid crystal layer when the liquid crystal layer is turned off. The function display unit is recognized using the light leaking due to the so-called off-segment omission. That is, the liquid crystal display panel is turned on and off in a relationship between the polarization axis due to the twist of linearly polarized light based on the alignment direction of the liquid crystal molecules and the transmission axis (or absorption axis) of the polarizing plate.
If the direction of the polarization axis of the linearly polarized light that has passed through the liquid crystal layer is exactly the same as the direction of the absorption axis of the polarizing plate, the light is completely blocked and the color becomes dark. However, if the light is not twisted such that the twist of the polarization axis of the linearly polarized light by the liquid crystal layer completely matches the direction of the absorption axis of the polarizing plate, a part of the light leaks, that is, a so-called segment-off loss occurs. In the liquid crystal display panel, since such segment-off missing (light leakage at the time of off-state) is present, the light is used to recognize the location of the function display section even in a dark place.

[0005]

However, segment-off omission has a viewing angle dependency, and there are directions in which light leakage can be recognized and directions in which it cannot be recognized depending on the viewing direction. Therefore, there is a problem that an appropriate selection cannot be made depending on the viewing direction of the liquid crystal display panel. In particular, with the recent development of the liquid crystal display element manufacturing technology, the segment off loss has been improved, and light leakage at the time of off has been extremely reduced. Therefore, there is a problem that the function display section of the negative display liquid crystal display panel as described above cannot be accurately recognized even in a dark place, and the touch panel cannot be operated accurately.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. In a liquid crystal display device in which a touch panel is overlaid on a negative display liquid crystal display panel provided with a function display section, the function display section is provided in a dark place. It is an object of the present invention to provide a liquid crystal display element capable of accurately recognizing.

[0007]

A liquid crystal display device according to the present invention comprises a negative type liquid crystal display panel and a touch panel provided on the front surface of the liquid crystal display panel, and the function display section of the liquid crystal display panel is formed by the touch panel. A liquid crystal display element to be selected, wherein a light transmitting member is provided between two substrates of the liquid crystal display panel near a function display section of the liquid crystal display panel. With this structure, the liquid crystal material cannot enter between the two substrates at the position where the light transmitting member is provided, and the liquid crystal material does not twist the linearly polarized light. Therefore, light passes through the polarizing plates on both sides of the liquid crystal panel in which the directions of the absorption axes are unified, and the portion becomes bright. Since the light transmitting member is provided near the function display section, the function display section can be brightened and the function display section to be selected can be recognized.

[0008] The light transmitting member is the second liquid crystal display panel.
Since it is made of the same material as the sealant that sticks two substrates around, just changing the shape of the pattern of the mask that prints the sealant when sticking two insulating transparent substrates, This step is not required, so that it can be easily formed without increasing the number of steps, which is preferable.

[0009]

Next, the liquid crystal display device of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a display pattern of a liquid crystal display device according to an embodiment of the present invention, and a cross-sectional view taken along the line BB.

The liquid crystal display element of the present invention comprises a liquid crystal display panel 10 and a touch panel 30. The liquid crystal display panel 10 has, like the ordinary liquid crystal display panel, ITO,
A transparent electrode 13 made of indium oxide, tin oxide, or the like;
14 and alignment films 15 and 16 are provided, and they are adhered to each other with a sealant 17 around the periphery with a constant gap so that their surfaces face each other. A liquid crystal material is injected into the gap to form a liquid crystal layer 18. I have. Polarizing plates 19, 2
0 is provided. FIG. 1 shows the inner surface or the outer surface of the insulating transparent substrate 12 on the display surface side on which electrodes and the like are provided.
Marks FM1 to FM4, AM1 as shown in FIG.
AM4, mark V1 indicating the level of volume Vol
A function display unit 21 showing a function like V5 is provided by a color filter or the like, and the frequency or the like at that time is displayed on the segment display unit 23 so that the portion can be displayed or hidden. The transparent electrodes 13 and 14 are patterned so that they can be formed.

In the vicinity of each display mark of the function display section 21, a light transmitting member 22 is provided between the two insulating transparent substrates 11 and 12 in a linear or dot shape when viewed from the display surface side. ing. The size of the linear or dot-shaped light transmitting member is so bright that the function display section 21 can be recognized even in a dark place, and dark enough that the lit function display section can be clearly distinguished from the non-lit function display section. As described above, it is provided to such an extent that the light amount can be obtained. Therefore, the shape is not limited to a linear shape or a dot shape. This light transmitting member 22 can be provided, for example, with the same material as the sealing agent 17 used when the insulating transparent substrates 11 and 12 are attached. That is, the sealing agent 17 is used for the insulating transparent substrate 11, 1
2 is provided by screen printing or the like on one of the two substrates, and the other of the insulating transparent substrates 11 and 12 is overlaid and adhered. When forming a mask for the screen printing, each mark of the function display section 21 is formed. The light transmitting member 22 can be easily formed by performing the patterning such that the light transmitting member 22 is also applied to the vicinity of the substrate. However, sealant 1
7, a different light-transmitting material such as PVA,
An acrylic resin or the like may be provided by screen printing or the like.

The touch panel 30 is connected to the liquid crystal display panel 10.
In the same manner as described above, two insulating transparent substrates 3 in which conductive transparent electrodes 33 and 34 made of ITO, tin oxide, indium oxide, and the like are provided in stripes in directions orthogonal to each other.
1 and 32 are opposed to each other with a slight space therebetween. A resin bead (not shown) or the like is strewn in the gap between the two insulating transparent substrates 31 and 32 so that the electrodes 33 and 34 of the two substrates 31 and 32 are not touched by being bent to a portion not to be touched. The gap between the two insulating transparent substrates 31 and 32 is very small, and the touched portions are the two substrates 31 and 3.
The two opposing electrodes 33 and 34 are in contact with each other, and the coordinates of the touched location are specified.

According to the liquid crystal display element of the present invention, since the light transmitting member 22 is provided between the insulating transparent substrates 11 and 12 near the function display section 21 of the liquid crystal display panel 10,
In that part, the liquid crystal material is excluded. Therefore, the linearly polarized light transmitted through one of the polarizing plates and the insulating transparent substrate is transmitted through the other polarizing plate without its polarization axis being twisted. This light does not pass through the liquid crystal layer and does not depend on the twist in the direction of the polarization axis, so that it can be clearly recognized from any direction. As a result, light is transmitted to the vicinity of the function display unit 21 and the mark on the function display unit 21 can be recognized in a dark place from any direction. In this state, in order to select, for example, FM3, by touching the touch panel 30 at the mark FM3, the signal is sent to a drive circuit (not shown), and its x coordinate and y
The coordinates can be recognized. As a result, in response to a command from the drive circuit to the liquid crystal display panel 10 and an FM stereo side (not shown), the function display unit 21 of the liquid crystal display panel 10
Mark FM3 is displayed, and the broadcast of FM3 can be received.

Further, according to the liquid crystal display device of the present invention, as described above, the insulating transparent substrate 1 near the function display section 21 is provided.
Since the light transmitting member 22 such as a sealant is provided between the first and second light transmitting members 12, even if the function display section 22 is pressed, the light transmitting member 22 is pressed.
Becomes a pillar, and the insulating transparent substrate 1 of the liquid crystal display panel 10
The interval between 1 and 12 does not change. Therefore, even if the display surface of the liquid crystal display element is touched, the display does not blur,
A clear display can be provided.

[0015]

According to the present invention, in a liquid crystal display device having a liquid crystal display panel for negative display and a touch panel,
The display of the function to be selected can be easily recognized from either direction even in a dark place, and it is very easy to use. In addition, the light transmissive member between the substrates of the liquid crystal display panel becomes a stick, and even if a force is applied to the touch panel of the function display section, the distance between the substrates of the liquid crystal display panel does not change at all, causing display blurring or blurring. Never be.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of an embodiment of a liquid crystal display device of the present invention, and a sectional view taken along line BB of FIG.

FIG. 2 is a diagram showing an example of a function display section of a conventional liquid crystal display device having a touch panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Liquid crystal display panel 11 Insulating transparent substrate 12 Insulating transparent substrate 21 Function display part 22 Light transmission member 30 Touch panel

Claims (2)

[Claims] 1. A liquid crystal display element comprising: a negative type liquid crystal display panel; and a touch panel provided on a front surface of the liquid crystal display panel, wherein the touch panel selects a function display section of the liquid crystal display panel. A liquid crystal display element comprising a light transmitting member provided between two insulating transparent substrates of the liquid crystal display panel near a function display section of the panel. 2. The liquid crystal display element according to claim 1, wherein the light transmitting member is made of the same material as a sealant for sticking two substrates of the liquid crystal display panel around.