JP2010079011A - Liquid crystal display panel with integrated protection plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To bond a liquid crystal display element and an observation surface protection plate with a photopolymerizable resin, and to make the bonding strength between the liquid crystal display element and observation surface protection plate sufficiently high even at a part outside a screen area of the liquid crystal display element. <P>SOLUTION: On an observation side of the liquid crystal display element 1, the observation surface protection plate 10 provided with a shading film 11 having light reflectivity is arranged outside an area of a surface, opposite to the liquid crystal display element 1, corresponding to the screen area 1a of the liquid crystal display element 1, and the liquid crystal display element and observation surface protection plate 10 are bonded with a resin layer 14 filled in the gap between them and polymerized by irradiation with light. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a protective plate integrated liquid crystal display panel.

As the liquid crystal display panel, an observation surface protection plate for protecting the surface on the observation side of the liquid crystal display element is provided on the observation side of the liquid crystal display element that controls light transmission and displays an image. There is a protective plate-integrated liquid crystal display panel in which a gap is provided between them and the liquid crystal display element and the observation surface protection plate are joined by a resin layer filled in the gap between them.
JP-A-6-337411

  The resin for joining the liquid crystal display element and the observation surface protection plate in the protective plate integrated liquid crystal display panel includes a thermopolymerizable resin and a photopolymerizable resin. A photopolymerizable resin that polymerizes in a short time is advantageous because it takes time.

  A protection plate integrated type liquid crystal display panel in which a liquid crystal display element and an observation surface protection plate are joined by a photopolymerizable resin supplies the photopolymerizable resin to one of the opposing surfaces of the liquid crystal display element and the observation surface protection plate. Then, the observation surface protective plate is stacked on the liquid crystal display element and pressed to fill the gap between the liquid crystal display element and the observation surface protective plate with the photopolymerizable resin, and then externally (liquid crystal It is manufactured by a method of polymerizing the photopolymerizable resin by irradiating with ultraviolet light from the side opposite to the observation side of the display element or the outer side of the observation surface protection plate.

  However, the liquid crystal display element is provided with a light shielding film (black mask) corresponding to a portion outside the screen area on the substrate on the observation side, and the observation surface protection plate has the liquid crystal display element. Since a blindfold film for covering the portion outside the screen area of the liquid crystal display element is provided on the outer side of the region corresponding to the screen area, the space between the liquid crystal display element and the observation surface protection plate is provided. In the photopolymerization of the photopolymerizable resin filled in the gap, ultraviolet light irradiated from the outside is blocked by the light-shielding film or the blind film, and the resin corresponding to the light-shielding film and the blind film is sufficiently polymerized. I can't.

  Therefore, the protection plate integrated liquid crystal display panel in which the liquid crystal display element and the observation surface protection plate are bonded with a photopolymerizable resin has a bonding strength between the liquid crystal display element and the observation surface protection plate in a portion corresponding to the outside of the screen area. For this reason, the observation surface protection plate may peel off from the peripheral side.

  The present invention provides a protective plate integrated liquid crystal display panel in which a liquid crystal display element and an observation surface protection plate are bonded with a photopolymerizable resin and the bonding strength between the liquid crystal display element and the observation surface protection plate is increased. It is intended to do.

The protection plate integrated liquid crystal display panel according to claim 1 of the present invention includes:
A liquid crystal display element that displays an image by controlling light transmission;
On the observation side of the liquid crystal display element, a gap is provided between the liquid crystal display element and the surface facing the liquid crystal display element is positioned outside the area corresponding to the screen area of the liquid crystal display element. An observation surface protective plate provided with a blindfold film having light reflectivity;
A resin layer filled in a gap between the liquid crystal display element and the observation surface protection plate and polymerized by light irradiation;
It is characterized by providing.

  According to the protection plate integrated liquid crystal display panel of the present invention, the bonding strength between the liquid crystal display element and the observation surface protection plate can be sufficiently increased even in a portion corresponding to the outside of the screen area of the liquid crystal display element. .

  1 and 2 show an embodiment of the present invention. FIG. 1 is a side view of a protection plate integrated liquid crystal display panel, and FIG. 2 is an enlarged sectional view of one end of the protection plate integrated display liquid crystal display panel. It is.

  This protective plate-integrated liquid crystal display panel is disposed with a gap between the liquid crystal display element 1 that displays light by controlling the transmission of light and the liquid crystal display element 1 on the observation side of the liquid crystal display element 1. The observation surface protection plate 10 and a resin layer 14 filled in the gap between the liquid crystal display element 1 and the observation surface protection plate 10 and polymerized by light irradiation are provided.

  The liquid crystal display element 1 is disposed opposite to each other with a predetermined gap, and a pair of transparent substrates 2 and 3 on the observation side and the opposite side bonded to each other through a frame-shaped sealing material 5 at the periphery, A liquid crystal layer 6 enclosed in a region surrounded by the sealing material 5 in the gap between the substrates 2 and 3, and a pair of observation sides disposed on the outer surfaces of the pair of substrates 3 and 4 and a pair of opposite sides thereof It consists of polarizing plates 7 and 8.

  Then, the inner surface of the substrate 2 on the observation side of the liquid crystal display element 1 corresponds to a portion outside the screen area 1a composed of a predetermined area that is somewhat inside the inner peripheral surface of the frame-shaped sealing material 5. The light shielding film (black mask) 4 to be formed is formed of, for example, a light shielding resin to which a black pigment is added.

  The liquid crystal display element 1 is an active matrix liquid crystal display element in which, for example, a TFT (thin film transistor) is used as an active element. Although not shown in the figure, the liquid crystal display element 1 is formed on the inner surface of one substrate, for example, the substrate 3 opposite to the observation side. A plurality of transparent pixel electrodes arranged in the row and column directions in the screen area 1a, a plurality of TFTs disposed corresponding to these pixel electrodes and connected to the corresponding pixel electrodes, A plurality of scanning lines for supplying gate signals to the TFTs in each row and a plurality of signal lines for supplying data signals to the TFTs in each column are provided, and the other substrate, for example, the inner surface of the substrate 2 on the observation side, A single-film transparent counter electrode facing the array region of the plurality of pixel electrodes is provided.

  The opposite substrate 3 is formed with a driver mounting portion 3a extending outward from the observation side substrate 2, and the plurality of scanning lines and signal lines are mounted on the driver mounting portion 3a. The counter electrode connected to the display driver 9 is connected to the counter electrode via a cross connection portion (not shown) provided at the substrate bonding portion by the sealing material 5 and a counter electrode connection line (not shown) formed on the driver mounting portion 3a. Connected to a potential source.

  Although not shown in the figure, the inner surface of the observation-side substrate 2 has red, green, blue corresponding to a plurality of pixels each having a region in which the plurality of pixel electrodes and the counter electrode face each other. These three color filters are provided, and the counter electrode is formed on the color filter.

  Further, an alignment film is provided on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes, and the liquid crystal molecules of the liquid crystal layer 6 are interposed between the pair of substrates 2 and 3 by the alignment film. It is oriented in the defined orientation state.

  The liquid crystal display element 1 displays an image by controlling transmission of light emitted from a surface light source (not shown) disposed on the opposite side to the observation side by applying a voltage between the electrodes of the plurality of pixels. To do.

  The liquid crystal display element 1 is a TN type or STN type liquid crystal display element in which the liquid crystal molecules of the liquid crystal layer 6 are twisted between a pair of substrates 2 and 3, and the liquid crystal molecules are substantially perpendicular to the substrate surface. Aligned vertical alignment type, non-twisted horizontal alignment type liquid crystal display device in which liquid crystal molecules are aligned substantially parallel to the substrate surface with the molecular long axis aligned in one direction, bend alignment type liquid crystal for bending alignment of liquid crystal molecules Any of a display element, a ferroelectric or antiferroelectric liquid crystal display element may be used. Furthermore, the liquid crystal display element 1 is not limited to the one provided with electrodes for forming a plurality of pixels on the inner surfaces of the pair of substrates 2 and 3, but on the inner surface of one of the pair of substrates 2 and 3, A first electrode for forming a plurality of pixels and a second electrode having a plurality of elongated electrode portions formed on the liquid crystal layer side with insulation from the first electrode are provided. A lateral electric field control type of changing the alignment state of liquid crystal molecules by generating a lateral electric field (electric field in a direction along the substrate surface) between the electrodes may be used.

  On the other hand, the observation surface protection plate 10 has a high bending resistance such as a glass plate, an acrylic plate, a polycarbonate plate, etc., which is formed in a rectangular plate shape having a peripheral portion protruding outward from the liquid crystal display element 1. The liquid crystal display element 1 is formed on a portion of the surface of the protective plate 10 facing the liquid crystal display element 1 outside the area corresponding to the screen area 1a of the liquid crystal display element 1. A blindfold film 11 is provided to cover a portion outside the screen area 1a.

  The blindfold film 11 is made of a metal film having light reflectivity, for example, a chromium (Cr) film, and the inner peripheral edge of the blindfold film 11 is the screen area over the entire periphery of the peripheral edge portion of the observation surface protection plate 10. Corresponding to the peripheral edge of 1a, the outer peripheral edge is formed to have a width corresponding to the peripheral edge of the observation surface protection plate 10.

  Further, the peripheral edge of any one of the opposing surfaces of the liquid crystal display element 1 and the observation surface protection plate 10 is filled with the height of the gap between the liquid crystal display element 1 and the observation surface protection plate 10, that is, the gap. A spacer 12 is provided for defining the thickness of the resin layer 14 provided.

  The spacer 12 is formed in a rectangular frame shape corresponding to the peripheral portion of the observation side surface (hereinafter referred to as the front surface) of the liquid crystal display element 1, and the four side portions thereof are respectively the observation surface protection plate 10. It is made of a resin film having a predetermined thickness and formed in a width corresponding to a part between a part somewhat outside the inner peripheral edge of the blindfold film 11 provided on the front edge and the front peripheral edge of the liquid crystal display element 1. The same shape as the spacer 12 is formed on one of the opposing surfaces of the liquid crystal display element 1 and the observation surface protection plate 10, for example, the peripheral portion of the front surface of the liquid crystal display element 1 (the outer surface of the observation side polarizing plate 7). It is affixed by the double-sided pressure-sensitive adhesive tape 13 formed on.

  The observation surface protection plate 10 abuts the spacer 12 on the observation side of the liquid crystal display element 1 where the blind film 11 on the surface of the protection plate 10 facing the liquid crystal display element 1 is provided. The liquid crystal display element is disposed by the resin layer 14 that is disposed in the space between the liquid crystal display element 1 and the observation surface protection plate 10 and is filled with the spacer 12 and polymerized by light irradiation. 1 is joined.

  In this protective plate integrated liquid crystal display panel, the spacer 12 is attached to the peripheral portion of the front surface of the liquid crystal display element 1, and a photopolymerizable resin is applied to a region surrounded by the spacer 12 on the front surface of the liquid crystal display element 1. The observation surface protection plate 10 is applied to the spacer 12 by superposing and pressing the observation surface protection plate 10 on the liquid crystal display element 1 after being supplied by means such as dropping by a dispenser, transfer, or screen printing. In addition, the supplied photopolymerizable resin is filled in the entire region surrounded by the spacer 12 in the gap between the liquid crystal display element 1 and the observation surface protection plate 10, and then from the outside. It is produced by a method of polymerizing the photopolymerizable resin by irradiating with ultraviolet light.

  In the production of the protective plate integrated liquid crystal display panel, the photopolymerization of the photopolymerizable resin is performed, for example, by irradiating ultraviolet light from the side opposite to the observation side of the liquid crystal display element 1. Of the emitted ultraviolet light, the light traveling toward the portion outside the screen area 1 a of the liquid crystal display element 1 is blocked by the light shielding film 4 provided on the peripheral edge of the inner surface of the observation side substrate 2 of the liquid crystal display element 1.

  However, the protective plate-integrated liquid crystal display panel has a blindfold film 11 provided on a portion outside the region corresponding to the screen area 1a on the surface of the observation surface protective plate 10 facing the liquid crystal display element 1. Since it consists of metal films, such as chromium which has light reflectivity, the figure of the ultraviolet light which was irradiated from the opposite side to the observation side of the said liquid crystal display element 1, and permeate | transmitted the screen area 1a of the said liquid crystal display element 1 As indicated by a two-dot chain line in FIG. 2, light 15 directed toward the blindfold film 11 is reflected by the blindfold film 11, and the reflected light is directly or interface with the observation-side polarizing plate 7 of the liquid crystal display element 1. Or reflected by the interface between the observation side polarizing plate 7 and the observation side substrate 2 and incident on the portion of the photopolymerizable resin layer corresponding to the light shielding film 4 of the liquid crystal display element 1. Polymerize photopolymerizable resin

  The ultraviolet light may be irradiated from the outer surface side of the observation surface protection plate 10, and in that case, a portion of the irradiated ultraviolet light where the blinding film 11 of the observation side polarizing plate 7 is provided. Is reflected by the interface between the liquid crystal display element 1 and the observation-side polarizing plate 7, the interface between the observation-side polarizing plate 7 and the observation-side substrate 2, and the reflected light is The light is reflected by the blind film 11 and enters the portion corresponding to the light-shielding film 4 of the liquid crystal display element 1 in the layer of the photopolymerizable resin, and the photopolymerizable resin in this portion is polymerized.

  Therefore, the protective plate-integrated liquid crystal display panel is manufactured by using a photopolymerizable resin filled in a region surrounded by the spacer 12 in the gap between the liquid crystal display element 1 and the observation surface protective plate 10. The entire layer of the photopolymerizable resin can be polymerized by irradiation with ultraviolet light from the outside.

  Therefore, according to this protection plate integrated liquid crystal display panel, the liquid crystal display element 1 and the observation surface protection plate 10 are bonded together by a photopolymerizable resin, and the liquid crystal display element 1 and the observation surface protection plate 10 are bonded together. The bonding strength of the liquid crystal display element 1 can be sufficiently increased even in the portion corresponding to the outside of the screen area 1a.

  As described above, the liquid crystal display panel integrated with the protective plate can be efficiently manufactured because the liquid crystal display element 1 and the observation surface protective plate 10 are joined by the photopolymerizable resin that polymerizes in a short time. In addition, since the bonding strength between the liquid crystal display element 1 and the observation surface protection plate 10 can be sufficiently increased even in a portion corresponding to the outside of the screen area 1a of the liquid crystal display element 1, the observation surface protection plate There is no worry of 10 peeling, so that high reliability can be obtained.

  In the protection plate integrated liquid crystal display panel of the above embodiment, the height of the gap between the liquid crystal display element 1 and the observation surface protection plate 10 (the thickness of the resin layer 14 provided to fill the gap) is defined. The spacer 12 is attached to the liquid crystal display element 1, but this spacer 12 may be attached to the observation surface protection plate 10, and in that case, the protection of the observation surface is performed in the production of the protection plate integrated liquid crystal display panel. What is necessary is just to supply photopolymerizable resin to the area | region enclosed by the said spacer 12 of the surface facing the liquid crystal display element 1 of the board 10. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified cross-sectional view of a protective plate integrated liquid crystal display panel according to an embodiment of the present invention. The expanded sectional view of the one end part of the said protective plate integrated liquid crystal display panel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 1a ... Screen area, 2, 3 ... Substrate, 4 ... Light-shielding film, 6 ... Liquid crystal layer, 7, 8 ... Polarizing plate, 10 ... Observation surface protective plate, 11 ... Blindfold film, 12 ... Spacer, 13 ... Double-sided adhesive tape, 14 ... Resin layer.

Claims (1)

A liquid crystal display element that displays an image by controlling light transmission;
On the observation side of the liquid crystal display element, a gap is provided between the liquid crystal display element and the surface facing the liquid crystal display element is positioned outside the area corresponding to the screen area of the liquid crystal display element. An observation surface protective plate provided with a blindfold film having light reflectivity;
A resin layer filled in a gap between the liquid crystal display element and the observation surface protection plate and polymerized by light irradiation;
A protective plate-integrated liquid crystal display panel comprising:

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