KR20020040695A - LCD panel with image acquisition part and method of manufacturing same - Google Patents

Abstract

PURPOSE: A liquid crystal display panel having an image input part and a method of fabricating the liquid crystal display are provided to fabricate the image input part on a color filter substrate of the liquid crystal display panel. CONSTITUTION: A liquid crystal display panel includes a color filter substrate and an image input part. The color filter substrate is constructed in such a manner that a black matrix(142) is formed on a glass substrate(144) and a color filter(141) is formed on the black matrix. The image input part is formed on the color filter substrate. The image input part is configured of a photo-detector(60), a switching element(70) and a capacitor(80). The photo-detector includes the first gate electrode(61), the switching element includes the second gate electrode(71), and the capacitor includes electrodes(81,81'). The photo-detector and the switching element are formed in an area occupied by the black matrix. The capacitor is formed at a region other than the area occupied by the black matrix.

Description

Liquid crystal display panel having an image input unit and a method of manufacturing the same {LCD panel with image acquisition part and method of manufacturing same}

The present invention relates to a liquid crystal display panel having an image input unit. More specifically, the present invention relates to an apparatus for forming an image input unit directly on a color filter substrate of a liquid crystal display panel and simultaneously performing image input such as information display by a liquid crystal and image input such as a fingerprint and a manufacturing method thereof.

As is well known to those skilled in the art, the liquid crystal display panel is composed of a plurality of unit cells to display the information image by controlling the amount of light transmitted through the cell according to the light incident from the lower light source and the signal of each cell input from the data driver. It is an element to make. In addition, as is well known to those skilled in the art, the image input panel has a unit cell composed of a light sensing part, a switching part, and a storage capacitor on a transparent substrate, arranged vertically and horizontally on a surface thereof. A device that inputs an image on the principle of irradiating light to a contact object (an object having a pattern such as a fingerprint, a character, a picture, etc.), and detecting and storing the reflected light for each cell with a light sensing unit. Sensor and the like.

Background Art [0002] In the past, a device has been studied in which a liquid crystal display panel and an image input panel are superimposed on a layer to serve as both a display of information by a liquid crystal display panel and an input of an image by an image input panel (Application No. 10-2001-0031067). Reference). Since both devices use a lower light source, the device can use a common lower light source. Since the image input panel is transparent, the device can overlap from the top of the image input panel-liquid crystal display panel-lower light source. It is an effective device in terms of utilization and reduction of parts score. 1, a configuration of a conventional liquid crystal display and an image input panel is introduced. The device overlapping the image input panel 20, the liquid crystal display panel 10, and the lower light source 30 is illustrated.

2A shows the configuration of a general liquid crystal display panel. It can be seen from the bottom that the TFT array substrate 11, the liquid crystal plate 12, and the color filter substrate 13 are arranged in a layered manner. The color filter substrate 13 has a structure in which R, G, and B cells are sequentially arranged 15 in a vertically and horizontally arranged manner, and boundary portions between the cells are opaquely processed so that light can be transmitted from the bottom or from the top. It prevents light from entering and improves the resolution of the display image. This opacity is called the black matrix. The structure of the color filter substrate 13 is shown in Fig. 2B. FIG. 2B is a cross-sectional view of the unit cell 14 of the color filter substrate. The color filter layer 141 is formed on the glass substrate 144. The black matrix layer 142, which is a boundary of each cell, is formed of a glass substrate ( First, the color filter layer 141 is formed on the 144. The electrode 143 is positioned on the surface of the color filter layer 141.

On the other hand, the image input panel is configured as shown in FIG. 3 is a longitudinal sectional view of a unit cell of an image input panel using a thin film transistor (TFT). This is a kind of contact image sensor using a-Si: H photosensitivity, which has a relatively thin structure and thus high photosensitivity. 3, in the image input panel 110, the light sensing unit 112 and the switching unit 113 are horizontally arranged on the transparent substrate 111, and the lower light source L is positioned below the transparent substrate 111. The light is emitted toward the light passing through the image input panel 110. The source electrode 112 -S of the light sensing unit 112 and the drain electrode 113 -D of the switching unit 113 are electrically connected to each other through the first electrode 114, and the gate of the light sensing unit 112 is connected. The second electrode 115 is connected to the electrode 112 -G. In the above configuration, a photosensitive layer 112 -P such as amorphous silicon (a-Si: H) is formed between the drain electrode 112 -D and the source electrode 112 -S of the light sensing unit 112. Therefore, when light of a predetermined amount or more is incident on the photosensitive layer 112-P, the drain electrode 112-D and the source electrode 112-S are electrically conductive. Accordingly, when an object (illustrated as a fingerprint in FIG. 2B) is input to the image input panel 110 for the image input, the light L generated from the backlight under the transparent substrate 111 is reflected according to the fingerprint pattern to detect the light. By receiving light into the photosensitive layer 112-P of the part 112, the photosensitive part 112 becomes conductive. The switching unit 113 is set to scan a fingerprint by a gate control signal applied to the gate terminal 113 -G and is switched every frame, so that each of the arranged photodetectors 112 is provided to the image input panel 110. The input fingerprint image is scanned and formed as a frame. Accordingly, the light shielding layer 113-sh is covered with the switching unit 113 on the drain electrode 113 -D to the source electrode 112-S to prevent external light from entering.

A liquid crystal display and an image input panel having a common lower light source may be implemented by overlapping the liquid crystal display panel and the image input panel configured as shown in FIGS. 2A and 3 as shown in FIG. 1. 1, the light irradiated from the lower light source 30 is transmitted through the display image of the liquid crystal display panel 10 and the transmitted light is an image input panel 20 positioned above the liquid crystal display panel 10. The light is reflected by an object (subject) located on the surface of the image input panel 20. The reflected light is sensed by the photodetector in each cell of the image input panel 20 and converted into photocurrent, stored in the form of charge in the storage capacitor, and sequentially output according to an external control signal by the switching unit. . On the other hand, each cell of the liquid crystal display panel 10 is driven by a display data driver and a gate driver (not shown) to display information as an image, which the user views through the transparent image input panel 20. It becomes possible.

However, in the liquid crystal display and the image input panel of FIG. 1, the following problems exist in addition to the benefits of the overlap of the two.

First, since the amount of light reaching the image input panel through the liquid crystal display panel is attenuated while passing through the substrate of the image input panel and irradiated to the subject, the efficiency of image input is reduced. To compensate for the amount of light attenuated, the brightness of the lower light source must be increased, which leads to an increase in power consumption.

Second, since the light shielding layer is present in the image input panel, the light irradiated to the subject is not uniformly radiated over the entire area. Therefore, the quality of the image sensed through the image input panel is degraded.

Third, since the liquid crystal display panel and the image input panel are separately manufactured and overlapped, the positions of the openings (regions through which light passes) of the liquid crystal display panel and the image input panel do not coincide with each other. Therefore, the image quality of the image displayed through the liquid crystal display panel is degraded. Of course, the image input quality in the image input panel is also degraded.

Fourth, in order to improve the light transmittance of the image input panel, the source / drain electrodes of the photodetector transistor may be replaced with a transparent conductive oxide such as ITO. However, since the oxide electrode is less conductive than the metal electrode, the image input panel itself Will degrade the characteristics.

Fifth, since a liquid crystal display panel and an image input panel are separately manufactured and superimposed and assembled, problems such as an increase in manufacturing cost and element damage due to physical impact during assembly occur.

The present invention provides a liquid crystal display panel having an image input unit having a structure having an image input unit formed on a color filter substrate of a liquid crystal display panel without superimposing a separate image input panel on the liquid crystal display panel in order to solve the problems. The purpose is to present a method.

1 is a schematic diagram of a conventional liquid crystal display and image input panel.

2A is a block diagram of a conventional liquid crystal display panel.

2B is a longitudinal sectional view of a color filter substrate unit cell applied to a liquid crystal display panel.

3 is a unit cell configuration diagram of a conventional image input panel.

4 is a conceptual diagram showing the outline of the present invention;

FIG. 5 is a cross-sectional view of a unit cell re-expressing the image input unit of FIG. 2A;

Figure 6 is a block diagram of one embodiment of the present invention.

7 is a block diagram of another embodiment of the present invention.

8 is an overall circuit diagram including a drive unit of the liquid crystal display panel according to the present invention.

<Description of Drawing>

Liquid crystal display panel 10, TFT array substrate 11, liquid crystal plate 12, color filter substrate 13, unit cell 14 of color filter substrate, RGB cell 15, image input panel 20, Lower light source 30, black matrix layer 41, light sensing unit 42, switching unit 43, capacitor unit 44, glass substrate 50, light sensing unit 60, first gate 61 ), The first source / drain electrode 62, the switching unit 70, the second gate 71, the second source / drain electrode 72, the light shielding layer 73, the capacitor unit 80, and the electrode ( 81, 81 '), photosensitive layers 63, 73, insulating layers 64, 74, 82, surface protection layer 51, display data driver 91, liquid crystal display gate driver 92, image input part gate driver (93), the output signal processor 94, the image input panel 110, the transparent substrate 111, the light sensing unit 112, the gate electrode 112-G, the drain electrode 112-D, the source electrode ( 112-S), photosensitive layer 112-P, switching unit 113, gate terminal 113-G, drain electrode 113-D, source electrode 113-S, first electrode 114, Second electrode 115, light shielding layer 113-sh, color filter layer 141 ), Black matrix layer 142, electrode 143, glass substrate 144

The basic concept of the present invention is as shown in FIG. That is, the image input unit is formed on the color filter substrate 13 constituting the liquid crystal display panel. Specifically, as shown in FIG. 4, the light sensing unit 42 and the switching unit 43 are formed in the area where the black matrix layer 41 is positioned, and outside the area where the black matrix layer 41 is located. The capacitor portion 44 is formed. Since the black matrix layer must be present in the liquid crystal display panel, it is a basic starting point of the present invention to form the light sensing unit and the switching unit of the image input unit so as to cover the black matrix layer.

In order to solve the above problems, the present invention provides a liquid crystal display panel comprising a color filter substrate having a black matrix layer formed on a glass substrate and a color filter layer formed thereon; An apparatus including an optical sensing unit, an image input unit consisting of a switching unit and a capacitor unit is formed on a surface of a color filter substrate of a liquid crystal display panel.

Based on the description in the related art, the light sensing unit of the image input unit includes a first source, a first drain, and a first gate electrode, and the switching unit includes a second source, a second drain, and a second gate electrode. do. In the image display panel according to the present invention, the light sensing unit and the switching unit are formed on the surface of the color filter substrate of the liquid crystal display panel, and they are formed to be located in an area occupied by the black matrix layer included in the color filter substrate. In addition, the capacitor portion of the image input portion is formed outside the area occupied by the black matrix layer included in the color filter substrate, the capacitor portion has a transparent electrode.

The position at which the image input unit is formed may be modified. The first position is formed on the opposite surface of the glass substrate of the color filter substrate of the liquid crystal display panel to be in contact with the black matrix layer, and the second position is the black matrix layer of the surface of the glass substrate of the color filter substrate of the liquid crystal display panel. It is formed on the contact surface.

In the former case, the switching unit further includes a light shielding layer, and in the latter case, the first gate electrode of the light sensing unit is formed to be transparent.

On the other hand, the liquid crystal display panel manufacturing method according to the present invention, forming a black matrix layer and a color filter layer on the surface of the glass substrate of the color filter substrate; The light sensing unit, the switching unit, and the capacitor unit of the image input unit are formed on the opposite surface of the glass substrate in contact with the black matrix layer, wherein the photosensitive unit and the switching unit occupy the black matrix layer included in the color filter substrate. It is formed in the region, wherein the capacitor portion is formed in addition to the area occupied by the black matrix layer and the electrode of the capacitor portion is configured to comprise a transparent.

The manufacturing method can also be configured by changing the order as follows. That is, forming a light sensing unit, a switching unit and a capacitor unit of the image input unit on the surface of the glass substrate, and forming a black matrix layer and a color filter layer on the opposite side of the surface of the glass substrate formed with the image input unit, At least the light sensing unit and the switching unit of the image input unit may be formed to be covered by a black matrix layer, and the electrode of the capacitor unit may be transparently formed.

According to another aspect of the method of manufacturing a liquid crystal display panel according to the present invention, a light sensing unit, a switching unit and a capacitor unit of the image input unit are formed on a surface of a glass substrate, and the first gate of the light sensing unit and the electrode of the capacitor unit are transparent. Forming to make; And forming a black matrix layer and a color filter layer after forming an insulating layer on the surface of the light sensing unit, the switching unit, and the capacitor unit, wherein the black matrix layer is formed to cover at least both the light sensing unit and the switching unit. do.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, FIG. 5 is a different representation of a unit cell of the image input unit shown in FIG. 2A for convenience of understanding. The light sensing unit 60, the switching unit 70, and the capacitor unit 80 are formed on the glass substrate 50. As described in the related art item, the light sensing unit 60 has a first gate 61 and a first source / drain electrode 62, and the switching unit 70 has a second gate 71 and a second source. A drain electrode 72; The light shielding layer 73 is formed in the switching unit 70 to prevent light from being incident from the outside. The capacitor portion 80 has two electrodes 81 and 81 '. 5, "63" and "73" represent photosensitive layers such as a-Si: H, "64", "74", and "82" represent insulating layers, and "51" represents a surface protective layer. Indicates.

FIG. 6 shows how an image input unit formed as shown in FIG. 5 is formed on a color filter substrate of a liquid crystal display panel as a first embodiment of the present invention. Repeatedly, the liquid crystal display panel includes a color filter substrate having a black matrix layer 142 formed on the glass substrate 144 and a color filter layer 141 formed thereon.

In FIG. 6, it can be seen that the image input unit is formed on the opposite side of the black matrix layer 142 on the surface of the glass substrate 144 of the color filter substrate of the liquid crystal display panel. That is, the light sensing unit 60, the switching unit 70, and the capacitor unit 80 are formed from the glass substrate 144 of the color filter substrate. In the case of FIG. 6, since the image input unit is formed on the opposite side of the surface on which the color filter 141 is formed, another process must be performed after any one of the color filter forming process or the image input forming process is completed. The process of forming the semiconductor element on the glass substrate 144 can be easily carried out by those skilled in the art by photolithography or a known method equivalent thereto.

The method of manufacturing the liquid crystal display panel of FIG. 6 includes forming a black matrix layer 142 and a color filter layer 141 on a surface of the glass substrate 144 of the color filter substrate; The light sensing unit 60, the switching unit 70, and the capacitor unit 80 of the image input unit are formed on the opposite surface of the glass substrate 144 that the black matrix layer 142 is in contact with. The unit 60 and the switching unit 70 are formed in a region occupied by the black matrix layer 142 included in the color filter substrate, and the capacitor unit 80 occupies the region occupied by the black matrix layer 142. In addition, the electrodes 81 and 81 'of the capacitor unit 80 are formed to be transparent.

In the manufacturing of the liquid crystal display panel of FIG. 6, regardless of whether the image input unit is formed first or the color filter substrate is formed first, starting with the glass substrate 144, the manufacturing may be performed by the following method. Forming a light sensing unit 60, a switching unit 70, and a capacitor unit 80 on the surface of the glass substrate 144; The black matrix layer 142 and the color filter layer 141 are formed on the opposite surface of the glass substrate 144 on which the image input unit is formed, and at least the light sensing unit 60 and the switching unit 70 of the image input unit are formed. Is formed so as to be covered by the black matrix layer 142, and the electrodes 81 and 81 'of the capacitor unit 80 are transparent.

Meanwhile, in forming the image input unit on the surface of the glass substrate 144 of the color filter substrate of the liquid crystal display panel, the image input unit may be formed on the surface where the black matrix layer 142 is in contact with each other, as shown in FIG. That is, the second embodiment of FIG. 7 is a case where the image input unit is first formed before the black matrix layer 142 is formed on the glass substrate 144.

An alternative configuration of the image input unit is the same as that of FIG. 6, but in other respects, since the first gate and the second gate come into contact with the outside through the glass substrate 144, as shown in FIG. It is necessary to make light enter from the outside. Therefore, in the case of FIG. 7, the first gate 61 of the light sensing unit 60 should be configured as a transparent electrode. In addition, in FIG. 6, the light shielding layer 73 is provided to prevent external light from entering the switching unit 70. In FIG. 7, the light shielding layer is formed by using the second gate 71 as an opaque electrode. There are also side benefits that can be omitted.

The manufacturing process of the liquid crystal display panel according to the exemplary embodiment of FIG. 7 may also be made by techniques apparent to those skilled in the art. However, unlike the case of FIG. 6, since the image input unit formation and the color filter forming process may be sequentially performed in one direction from the glass substrate 144, the efficiency and productivity of the manufacturing process will be increased. On the other hand, in FIG. 6, the image input unit and the color filter should be formed in the opposite direction from the glass substrate 144.

In the method of manufacturing the liquid crystal display panel according to the embodiment of FIG. 7, the light sensing unit 60, the switching unit 70, and the capacitor unit 80 are formed on the surface of the glass substrate 144. Transparently forming the first gate 61 of the light sensing unit 60 and the electrodes 81 and 81 'of the capacitor unit 80, the light sensing unit 60, the switching unit 70, After the insulating layer 83 is formed on the surface of the capacitor unit 80, a black matrix layer 142 and a color filter layer 141 are formed, and the black matrix layer 142 is at least switched with the light sensing unit 60. It is configured to cover all the parts 70. In order to block external light, the second gate 71 of the switching unit 70 is opaquely formed as in the normal case.

8 illustrates a circuit configuration including a driving unit of a liquid crystal display panel having an image input unit according to the present invention. The display image signal is driven by the display data driver 91 and the liquid crystal display gate driver 92 to drive each unit cell to perform an image display. The image input unit reads an image of an object and the image input unit gate driver 93 The output signal processor 94 outputs the image signal of the object. This operation is briefly described and is a driving method known to those skilled in the art.

As described above, according to the present invention, by solving the disadvantages of the conventional liquid crystal display and the fingerprint input panel, it is possible to reduce the power consumption of the light source, and to prevent the display quality of the liquid crystal display panel from being lowered. In addition, since uniform light can be irradiated on the subject of the upper portion of the liquid crystal display panel, the efficiency and performance of the image input unit can be improved, and the image input unit is manufactured together when manufacturing the liquid crystal display panel, thereby reducing production cost and difficulty of assembly. Can be removed.

Claims (9)

A liquid crystal display panel including a color filter substrate having a black matrix layer formed on the glass substrate and a color filter layer formed thereon; A liquid crystal display panel having an image input section, comprising an image input section comprising a light sensing section, a switching section, and a capacitor section, formed on the color filter substrate of the liquid crystal display panel. In claim 1, The light sensing unit of the image input unit includes a first gate electrode, the switching unit includes a second gate electrode, the capacitor unit includes an electrode, The light sensing unit and the switching unit of the image input unit formed on the color filter substrate of the liquid crystal display panel are formed in an area occupied by the black matrix layer included in the color filter substrate, The capacitor portion of the image input portion formed on the color filter substrate of the liquid crystal display panel is formed outside the area occupied by the black matrix layer included in the color filter substrate, and the electrode of the capacitor portion is transparent, the liquid crystal display having the image input portion panel. The liquid crystal display having the image input unit according to claim 2, wherein the light sensing unit and the switching unit of the image input unit are formed on opposite surfaces of the glass substrate of the color filter substrate of the liquid crystal display panel to be in contact with the black matrix layer. panel. The liquid crystal display panel of claim 3, wherein the switching unit further comprises a light shielding layer. The liquid crystal display panel having the image input unit according to claim 2, wherein the light sensing unit and the switching unit of the image input unit are formed on a surface of the color filter substrate of the liquid crystal display panel which is in contact with the black matrix layer. The liquid crystal display panel of claim 5, wherein the first gate electrode of the light sensing unit is a transparent electrode. On the surface of the color filter substrate of the liquid crystal display panel including a color filter substrate having a black matrix layer formed on the glass substrate and a color filter layer formed thereon, an image input unit including an optical sensing unit, a switching unit and a capacitor unit having an electrode is formed. As a way to, Forming a black matrix layer and a color filter layer on a glass substrate surface of the color filter substrate; The light sensing unit, the switching unit, and the capacitor unit of the image input unit may be formed on the opposite surface of the glass substrate to be in contact with the black matrix layer, and the light sensing unit and the switching unit may occupy the black matrix layer included in the color filter substrate. The capacitor portion is formed outside the region occupied by the black matrix layer and the electrode of the capacitor portion is formed transparently; And forming a light shielding layer to prevent light from being incident from the outside on the switching unit. On the surface of the color filter substrate of the liquid crystal display panel including a color filter substrate having a black matrix layer formed on the glass substrate and a color filter layer formed thereon, an image input unit including an optical sensing unit, a switching unit and a capacitor unit having an electrode is formed. As a way to, Forming an optical sensing unit, a switching unit, and a capacitor unit on the surface of the glass substrate; A black matrix layer and a color filter layer are formed on opposite surfaces of the glass substrate on which the image input unit is formed, wherein at least the light sensing unit and the switching unit of the image input unit are covered by the black matrix layer. A method of manufacturing a liquid crystal display panel having an image input unit, comprising the step of forming transparent. On the surface of the color filter substrate of the liquid crystal display panel including a color filter substrate having a black matrix layer formed on the glass substrate and a color filter layer formed thereon, a light sensing unit having a first gate electrode and a second gate electrode A method of forming an image input unit comprising a switching unit and a capacitor unit having an electrode, Forming a light sensing unit, a switching unit, and a capacitor unit of the image input unit on the surface of the glass substrate, and transparently forming a first gate of the light sensing unit and an electrode of the capacitor unit; And forming a black matrix layer and a color filter layer after forming an insulating layer on the surface of the light sensing unit, the switching unit, and the capacitor unit, wherein the black matrix layer is formed to cover at least both the light sensing unit and the switching unit. The manufacturing method of the liquid crystal display panel which has an image input part.