KR20050100960A - Liquid crystal display panel and manufacturing method of the same - Google Patents

Abstract

The present invention relates to a liquid crystal display panel, a method for manufacturing a liquid crystal display panel, and a liquid crystal projector using the same, and an object thereof is to provide a liquid crystal display panel having improved light transmission efficiency.

The object of the present invention is to provide a first transparent substrate having a light blocking region including a switching element and a light transmitting region including a pixel electrode to which a voltage is applied by the switching element, and a second electrode having a common electrode facing the pixel electrode. A liquid crystal display panel which forms a liquid crystal layer between the transparent substrate, the first transparent substrate, and the second transparent substrate, and transmits or blocks light according to the liquid crystal arrangement of the liquid crystal layer, wherein the color of the convex lens is formed on the second transparent substrate. A color filter layer including a filter is provided, and a third transparent substrate for protecting the color filter is attached to the upper part of the color filter layer, and the color filter includes a dye and is repeatedly provided on the light transmitting area of the first transparent substrate. It can achieve by the liquid crystal display panel characterized by the above-mentioned.

Description

Liquid crystal panel for liquid crystal projector and its manufacturing method {LIQUID CRYSTAL DISPLAY PANEL AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to a liquid crystal panel for a liquid crystal projector and a method of manufacturing the same, and more particularly, to reduce the number of structures constituting the liquid crystal display panel by combining a color filter used in a single-plate liquid crystal display panel with a micro lens array. The present invention relates to a liquid crystal panel for a liquid crystal projector having a high transmittance and simple structure, and a method of manufacturing the same.

In general, a liquid crystal projector is a display device that forms an image using a liquid crystal display panel and then magnifies an image formed on the liquid crystal panel using an optical system and projects it on a screen. A method of forming an image on a liquid crystal panel includes a thin film transistor that applies an electric field to a liquid crystal for each liquid crystal cell, and uses a method of changing the molecular arrangement of the liquid crystal by controlling a voltage applied to the thin film transistor.

Such liquid crystal projectors are classified into a single plate type using one liquid crystal display panel and a three plate type using three liquid crystal display panels. The single plate type forms an image by providing R, G, and B color filters in one liquid crystal display panel. On the other hand, the three-plate type forms an image corresponding to R, G, and B separately using three liquid crystal display panels, and then applies a method of synthesizing the formed image using a synthetic prism.

The single plate and three plate types have their advantages and disadvantages. Since the liquid crystal projector has fewer optical devices and only one driving driver, the structure of the liquid crystal projector is simplified, and thus the LCD can be manufactured relatively inexpensively so as to have a small size. Disadvantages include the use of a color filter, which reduces the transmittance of the liquid crystal display panel, preventing the display of the image brightly.

The three-panel LCD projector has the advantage that brightness is brighter than the single-panel LCD projector, but the disadvantage is that each liquid crystal display panel is used for each of R, G, and B so that the area occupied by the driver and the area occupied by the panel are increased. Since the optical system, such as a prism that separates the point and the white light into R, G, and B and synthesizes the image formed on each panel, becomes complicated, the size of the liquid crystal projector becomes large, the weight becomes heavy, and the manufacturing cost increases.

On the other hand, it is common to use a microlens array for concentrating the incident light to the light transmission area for the upper substrate of the liquid crystal panel used in the single- or three-panel liquid crystal projector. The use of such a micro lens array has the advantage of increasing the brightness of the liquid crystal panel, while the cost of the micro lens array is quite expensive, difficult to match the alignment with the liquid crystal panel, there is a disadvantage that the structure of the liquid crystal cell is complicated. .

Therefore, the present invention was created to solve the problems of the prior art, and an object of the present invention is to provide a separate micro lens array by simultaneously performing the role of a micro lens array as a color filter layer as a liquid crystal panel used in a liquid crystal projector. The present invention is to provide a liquid crystal panel for a liquid crystal projector and a method of manufacturing the same, which have a simple structure and a low manufacturing cost, so that the structure of the liquid crystal display panel is simplified and the light transmittance is increased to display a sufficiently bright image. .

The object of the present invention is to provide a first transparent substrate having a light blocking region including a switching element and a light transmitting region including a pixel electrode to which a voltage is applied by the switching element, and a common electrode facing the pixel electrode. A liquid crystal layer formed between the second transparent substrate, the first transparent substrate, and the second transparent substrate, and transmitting or blocking light according to the liquid crystal arrangement of the liquid crystal layer, wherein the liquid crystal layer is convex on the second transparent substrate. A color filter layer including a lens-shaped color filter is provided, and a third transparent substrate protecting the color filter is attached to the upper portion of the color filter layer, and the color filter includes a dye and a light transmitting area of the first transparent substrate. Achievable by a liquid crystal display panel characterized in that it is provided repeatedly in the upper portion sequentially.

It is still another object of the present invention to provide a first transparent substrate having a light blocking region including a switching element and a light transmitting region including a pixel electrode to which a voltage is applied by the switching element, and a common electrode facing the pixel electrode. A liquid crystal layer is formed between a second transparent substrate, a first transparent substrate, and a second transparent substrate, and a method of manufacturing a liquid crystal display panel that transmits or blocks light according to the liquid crystal arrangement of the liquid crystal layer. The photoresist is formed into a convex lens shape by designating a position at which the photoresist including dye is applied on the transparent substrate, reflowing the photoresist patterned on the first step of applying and patterning the photoresist and the second transparent substrate. The second step and the third step of applying the optical adhesive on the reflowed photosensitive agent and then attaching the third transparent substrate and the first transparent substrate Bonded to claim maintain a constant cell gap, and a second transparent substrate, it is possible to achieve by the liquid crystal display panel manufacturing method according to claim consisting of a fourth step of injecting liquid crystal between the first transparent substrate and the second transparent substrate.

Hereinafter, the present invention will be more specifically understood from the following description in comparison with the prior art with reference to the accompanying drawings.

1 is a cross-sectional view showing a cross section of a liquid crystal display panel used in the liquid crystal projector according to the present invention. This will be described with reference to FIG. 1.

The liquid crystal display panel according to the present invention includes a first transparent substrate 10 having a switching element 11 and a pixel electrode 12, and a first transparent substrate 10 positioned opposite to the first transparent substrate 10 while maintaining a predetermined cell gap. 2 Convex curved shape repeatedly provided for each cell on the transparent substrate 30, the liquid crystal layer 20 interposed between the first transparent substrate 10 and the second transparent substrate 30, and the second transparent substrate 30. And a third transparent substrate 50 attached to the upper portion of the color filter layer 40 having the color filter 41.

In addition to the switching element 11, the first transparent substrate 10 blocks a capacitor (not shown) that accumulates charges applied to the liquid crystal cell for a predetermined time and a light reflected by the channel region of the switching element 11 to prevent leakage. The black mattress (not shown) for preventing the occurrence of the ink and the pixel electrode 12 for driving the liquid crystal are provided. A thin film transistor is mainly used as the switching element 11, and recently, polysilicon is adopted as an active layer to improve switching speed.

The second transparent substrate 30 is formed with a common electrode (not shown) facing the pixel electrode 12 formed on the first transparent substrate 10. In addition, an alignment layer (not shown) is formed on a surface of the first transparent substrate 10 and the second transparent substrate 30 facing the liquid crystal layer 20, respectively.

The color filter layer 40 including the color filter 41 having a convex curved shape in each cell is formed on the second transparent substrate 30. When the liquid crystal panel according to the present invention is used in a single-plate liquid crystal projector, the color filter is formed in a convex curved shape on the upper part of each cell region of the second transparent substrate 30 so that neighboring cells form one pixel. 41 allows the R color filter 41-1, the G color filter 41-2, and the B color filter 41-3 to be formed regularly and repeatedly. When the liquid crystal panel according to the present invention is used in a three-plate type liquid crystal projector, the color filter 41 formed on the upper portion of each cell region of the first transparent substrate 10 is used when the liquid crystal panel for R (Red) is used. 1, 41-2, 41-3 All color filters are formed with R color filters, and when used with G (Green) liquid crystal panels, all are formed with G color filters, and when used with B (Blue) liquid crystal panels All are formed with B color filters.

As a material for constituting the color filter 41, a photoresist to which dye was added was used. The dye is added to give the color of the desired color filter, and the dye material for this is already known material, so a detailed description thereof will be omitted. Photosensitizers are compounds that react sensitively to light. There are positive photoresists in which the irradiated part is dissolved in the developer and a negative photoresist in which the irradiated part is insoluble in the developer. In the present invention, a negative photoresist that does not melt during development is used. Examples of negative photoresists used in the present invention are shown in Table 1.

As described above, the switching element, the pixel electrode, and the like are formed on the first transparent substrate 10. The region including the switching element 11 becomes a light blocking region that does not transmit incident light, and the region where the pixel electrode 12 is formed is formed as a light transmitting region that transmits incident light. The convex curved color filter 41 formed in accordance with the present invention functions as a color filter for filtering white incident light into R, G, and B colors according to the type of dye, and at the same time, it receives light incident into the light blocking region. To be refracted into the transmission region. Therefore, the aperture ratio of the liquid crystal display panel can be improved without providing a separate lens for refracting the light incident to the light blocking region to the light transmitting region.

In this case, the distance between the color filter 41 and the first transparent substrate 10 may be adjusted by adjusting the thickness of the second transparent substrate 30 provided between the liquid crystal layer 20 and the color filter layer 40. By controlling the distance, the focal length of the lens formed by the convex color filter can be adjusted, so that the light irradiated by the color filter 41 can be sufficiently refracted to be concentrated in the light transmission area without being irradiated to the light blocking area.

A third transparent substrate 50 for protecting the color filter 41 was attached to the upper portion of the color filter layer 40 using the optical adhesive 42. The optical adhesive 42 is filled in the space between the convex curved surface of the color filter 41 and the flat surface of the third transparent substrate 50. As an adhesive used as the optical adhesive 42, one selected from an ultraviolet (Ultraviolet) curing agent, a thermosetting agent, a mixture of the ultraviolet curing agent and the thermosetting agent, and a silicone adhesive having good transmittance was used. Since such a material is already used to bond the upper substrate and the lower substrate of the liquid crystal, the refractive index and the like have already been guaranteed, so the detailed description thereof will be omitted.

The third transparent substrate 50 serves to prevent foreign matter from being displayed on the screen in addition to the function of protecting the color filter 41. The image formed on the liquid crystal display panel is enlarged through the projection lens and then displayed on the screen. Typically, the focus of the projection lens is made on the liquid crystal display panel. When the third transparent substrate 50 is not provided, foreign matter such as dust is directly attached to the surface of the liquid crystal display panel, and the attached foreign matter is displayed on the screen after being enlarged by the projection lens. On the other hand, when the third transparent substrate 50 having a predetermined thickness or more is provided on the color filter layer 40, foreign matters such as dust are attached on the third transparent substrate 50, and thus foreign matters are separated from the focal point of the projection lens. Of foreign matter is enlarged on the screen and is not displayed.

In addition, a lot of heat is generated in the liquid crystal display panel by the light irradiated to the liquid crystal display panel, and heat generated in order to prevent a malfunction of the liquid crystal display panel should be emitted to the outside. The third transparent substrate 50 also receives heat generated from the liquid crystal display panel through the color filter layer 40 and also dissipates it to the outside.

When the thicknesses of the first transparent substrate 10, the second transparent substrate 30, and the third transparent substrate 50 are t1, t2, and t3, respectively, the relationship between them is generally given by Equation (1).

t3> t1> t2

Even if dust adheres to the liquid crystal panel, the third transparent substrate 50 is thickest in order to escape from the focus of the projection lens and to dissipate heat to the outside more easily. In the case of the second transparent substrate 30, The focus is relatively thin for the color filter 41 having a convex shape.

2 is a flowchart illustrating a process of manufacturing a liquid crystal display panel used in the liquid crystal projector according to the present invention. Referring to Figure 2 as follows.

First Step (ST 100): The first transparent substrate 10 and the second transparent substrate 30 are prepared, and the color filter 41 is positioned on the second transparent substrate 30 through a key pattern process. Determine the area. As described above, the first transparent substrate 10 is divided into a light blocking region in which wiring portions such as a thin film transistor, which is a switching element, and a light transmitting region including pixel electrodes through which light is transmitted. Since the position of the color filter 41 to be applied should be such that light incident to the light transmission region passes as it is, and light incident to the light blocking region should be positioned to be refracted and incident to the light transmission region. The convexly shaped vertex is positioned at the center of the light transmission region. Three dyes of red, green, and blue, or a three-panel liquid crystal projector are applied to a designated position on the second transparent substrate 30, and then patterned by applying a photoresist including a dye of one color.

Second Step ST 110: Reflow the patterned photoresist. Color filters 41 are respectively formed on the second transparent substrate 30 in the form of continuous convex lenses. For the photoresist shown in Table 1, a smooth reflow occurred at about 120 degrees Celsius.

Third Step (ST 120): After applying the optical adhesive 42 on the second transparent substrate 30 on which the convex curved color filter 41 is formed, the third transparent substrate 50 is attached. The color filter layer 40 is formed. The process of attaching the third transparent substrate 50 using the optical adhesive 42 uses methods such as spin coating, vacuum injection, and general bonding. At this time, the space between the curved surface of the color filter 41 and the third transparent substrate 50 is filled by the optical adhesive 42.

Fourth Step (ST 130): After depositing a transparent electrode and an alignment layer on the lower portion of the second transparent substrate 30 on which the color filter layer 40 is formed, it is bonded to the first transparent substrate 10 while maintaining a constant cell gap Let's do it. In order to maintain a constant cell gap with the first transparent substrate 10, a ball-shaped spacer or a columnar spacer formed on the first transparent substrate is used.

Fifth Step (ST 140): After sealing the edges of the second transparent substrate 30 and the first transparent substrate 10 on which the color filter layer 40 is formed, the first transparent substrate 10 and the second in a vacuum state. Liquid crystal is injected between the transparent substrates 30 to complete the liquid crystal display panel.

A liquid crystal projector is completed by using at least one light source, a condenser lens for condensing light emitted from the light source, and a liquid crystal panel manufactured according to the present invention and a projection lens for projecting an image formed on the liquid crystal panel on a screen.

The liquid crystal display panel manufactured according to the present invention has a color filter layer that functions to refract the light incident to the light blocking region into the light transmitting region, and thus has a structure that is higher than that of a conventional liquid crystal panel having a color filter layer and an optical layer refracting separately. The simplicity reduces production costs and enables miniaturization.

In addition, when the liquid crystal display panel manufactured according to the present invention is applied to a three-plate type liquid crystal projector, a dichroic mirror for spectroscopy of light from white light is not required. Therefore, the number of parts of the optical apparatus used in the liquid crystal projector can be reduced. Will be.

In addition, although the conventional single-plate type liquid crystal display panel is provided with a color filter and a micro lens array separately, the liquid crystal display panel according to the present invention by using a color filter that functions as a micro lens array image to be displayed to increase the light transmittance of the liquid crystal display panel Can improve the brightness.

While the preferred embodiments of the present invention have been described using specific terms, such descriptions are for illustrative purposes only, and it is understood that various changes and modifications may be made without departing from the spirit and scope of the following claims. Should be done.

1 is a cross-sectional view of a liquid crystal display panel used in the liquid crystal projector according to the present invention.

2 is a flowchart illustrating a process of manufacturing a liquid crystal display panel used in the liquid crystal projector according to the present invention.

***** Explanation of the main symbols in the drawings *****

10: first transparent substrate 11: switching element

12: pixel electrode 20: liquid crystal layer

30: second transparent substrate 41, 41-1, 41-2, 41-3: color filter

42: adhesive 40: color filter layer

50: third transparent substrate

Claims (10)

A second transparent substrate having a first transparent substrate having a light blocking region including a switching element and a light transmitting region including a pixel electrode to which a voltage is applied by the switching element, and a common electrode facing the pixel electrode; In the liquid crystal display panel which forms a liquid crystal layer between the first transparent substrate and the second transparent substrate, and transmits or blocks the light according to the liquid crystal arrangement of the liquid crystal layer, A color filter layer including a convex lens-shaped color filter is provided on the second transparent substrate, and a third transparent substrate protecting the color filter is attached to an upper portion of the color filter layer. The color filter includes a dye and the liquid crystal display panel, characterized in that repeatedly provided on the light transmission area of the first transparent substrate sequentially. The method of claim 1, The color filter is a liquid crystal display panel, characterized in that the negative photoresist (negative photoresist). The method of claim 1, An optical adhesive is applied between the color filter and the third transparent substrate to attach the color filter and the third transparent substrate to each other. The method of claim 3, wherein The optical adhesive is a liquid crystal display panel, characterized in that at least one selected from UV adhesives, thermal adhesives and silicone adhesives. The method of claim 1, The color filter is a liquid crystal display panel, characterized in that formed by repeating the R, G, B color filters. A second transparent substrate having a first transparent substrate having a light blocking region including a switching element and a light transmitting region including a pixel electrode to which a voltage is applied by the switching element, and a second common substrate facing the pixel electrode; In the method for manufacturing a liquid crystal display panel is formed between the first transparent substrate and the second transparent substrate, the light transmission or blocking according to the liquid crystal arrangement of the liquid crystal layer, A first step of designating a position at which a photosensitive agent including dye is to be applied on the second transparent substrate, and applying and patterning the photosensitive agent; Reflowing the patterned photoresist on the second transparent substrate so that the photoresist is formed into a convex lens shape; A third step of attaching a third transparent substrate after applying an optical adhesive on the reflowed photoresist; And And a fourth step of bonding the first transparent substrate and the second transparent substrate to maintain a constant cell gap, and injecting liquid crystal between the first transparent substrate and the second transparent substrate. Manufacturing method. The method of claim 6, The color filter is a liquid crystal display panel manufacturing method characterized in that the negative photoresist (negative photoresist). The method of claim 6, The optical adhesive is at least one selected from a UV adhesive, a thermal adhesive and a silicone adhesive. A liquid crystal projector comprising at least one light source, a condenser lens for collecting light emitted from the light source, a liquid crystal panel for selectively turning on / off the condensed light, and a projection lens for projecting light emitted from the liquid crystal panel, wherein the liquid crystal The panel, A second transparent substrate having a first transparent substrate having a light blocking region including a switching element and a light transmitting region including a pixel electrode to which a voltage is applied by the switching element, and a common electrode facing the pixel electrode; A color filter layer is formed between the first transparent substrate and the second transparent substrate, and transmits or blocks light according to the liquid crystal arrangement of the liquid crystal layer, and a color filter layer having a convex lens-shaped color filter disposed on the second transparent substrate. A third transparent substrate protecting the color filter is attached to the upper portion of the color filter layer, and the color filter includes a dye and is repeatedly provided on the light transmitting area of the first transparent substrate in order. LCD projector. The method of claim 9, The liquid crystal projector, characterized in that using only one liquid crystal panel.