JPH05157906A - Color filter - Google Patents

Abstract

PURPOSE:To improve the efficiency of utilizing the light for irradiation of the color filter used for a liquid crystal panel, etc. CONSTITUTION:This color filter is constituted by forming many picture elements 4 on a transparent substrate 2 and providing reflection surfaces 21 which reflect a part of the light 19 for irradiating the picture elements 4 through the substrate 2 toward the picture elements 4 so as to face respective inter-picture element spacings 20. The color filter is constituted by forming the many picture elements 4 on the surface of the transparent substrate 2 and providing inclined scattering surfaces 22 for scattering a part of the light 19 for irradiating the picture elements 4 through the substrate 2 in corresponding to the respective inter- picture element spacings 20. The color filter is constituted by forming the many picture elements 4 on the surface of the transparent substrate 2 and providing refracting members 23 each having a V-shaped section for refracting and transmitting a part of the light 19 for irradiating the picture elements 4 through the substrate 2 toward the picture elements 4 so as to face the inter-picture element spacings 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter used for a color liquid crystal display panel or the like. Due to its thinness, lightness, and low power consumption, the liquid crystal display panel, which is in increasing demand for office automation equipment, personal computers, portable TVs, etc., has become popular for color display and will be used in the future. Is expected to be adaptable to new products such as wall-mounted televisions, and further demand expansion is expected.

TFT (Thin Film Transistor) type, STN
In various color liquid crystal display panels such as a (Super Twisted Nematic) type and a ferroelectric type, a color filter composed of pixels of three colors of red (R), green (G), and blue (B) is formed on a transparent substrate, and these 3 Pixels of colors are selectively driven to mix colors and display arbitrary colors.

[0003]

2. Description of the Related Art As a method for forming color pixels, there are an electrodeposition method, a printing method, a photolithographic method and the like. The photolithographic method is the most suitable for uniforming pattern accuracy and thickness. Prior to the pattern formation (exposure) of pixels using, the oxygen blocking film is formed on the photosensitive resin layer.

FIG. 12 shows an S using a conventional color filter.
It is a schematic cross section which shows the main structures of a TN type color liquid crystal display panel. In FIG. 12, a liquid crystal display panel 1 includes a first glass substrate 2 having a color filter, a first transparent electrode 6 and the like formed on the upper surface, and a second glass substrate having a second transparent electrode 8 and the like formed on the lower surface. Liquid crystal 10 is filled between the liquid crystal display device 7 and the liquid crystal display device 7. In the figure, 11 is a liquid crystal filling sealing material, 12 is a polarizing plate adhered to the lower surface of the glass substrate 2, 13 is a polarizing plate adhered to the upper surface of the glass substrate 8, and the lower surface of the glass substrate 2 is A backlight device 18 containing a plurality of fluorescent lamps 16 and a corrugated reflection plate 17 faces each other.

In the color filter of the glass substrate 2, a black mask 3 is formed on the upper surface of the glass substrate 2, and a large number of red pixels 4R and green pixels 4G are formed so as to fill the through holes for a large number of pixels of the black mask 3. Then, the blue pixel 4B is formed.

The transparent electrode 6 is formed by flattening the unevenness of the pixels 4R, 4G, 4B with the top coat layer 5, and the transparent electrodes 6 and 8 are formed.
Are covered with the alignment film 14 or 14. Generally, the black mask 3 made of metallic chrome is formed by forming a chromium vapor deposition film having a thickness of about 1000Å by a normal photolithography technique, and sequentially forming it for each color by the thickness 2 of the pixels 4R, 4G, 4B.
It is about μm.

The role of the black mask 3 is that a large number of pixels 4
In order to prevent light transmitted through the R, 4G, and 4B gaps, and to prevent color mixing due to dimensional differences and misalignment with the pattern of the opposing TFT formation substrate, backlight light is incident on the active elements such as TFTs and the transistor This is to prevent the characteristics from fluctuating significantly.

[0008]

As described above,
The conventional color filter requires the black mask 3, and if the mask area of the black mask 3 is increased, the light leakage, color mixture, and the deterioration of the transistor characteristics are prevented with a large margin. Since a part of the black mask 3 is shielded by the mask portion, there is a drawback that the utilization efficiency of transmitted light is lowered and the brightness as a display is lowered.

In the conventional color filter, the utilization efficiency of the transmitted light passing through the color filter forming substrate is 40%.
It is ~ 70%, and if the light source is brightened to secure the brightness of the display, the power consumption increases.

[0010]

1 (a), (b) and (c) are conceptual diagrams of a color filter according to the present invention. In FIG. 1 (a), a large number of color display pixels 4 are formed on the surface of the transparent substrate 2, and a part of the irradiation light 19 transmitted through the substrate 2 and applied to the pixel 4 is reflected toward the pixel 4. The color filter is characterized in that a character-shaped reflecting surface 21 is provided so as to face a gap 20 between a large number of pixels 4.

In FIG. 1B, a large number of color display pixels 4 are formed on the surface of the transparent substrate 2, and a part of the irradiation light 19 that is transmitted through the substrate 2 and applied to the pixels 4 is scattered in a V shape. surface
A color filter is characterized in that 22 is provided corresponding to a gap 20 between a large number of pixels 4.

In FIG. 1C, a large number of color display pixels 4 are formed on the surface of the transparent substrate 2, and a part of the irradiation light 19 transmitted through the substrate 2 and applied to the pixels 4 is directed toward the pixels 4. A color filter is characterized in that a refraction member 23 having a triangular cross section that refracts and transmits is provided so as to face a gap 20 between a large number of pixels 4.

[0013]

According to the above means, the conventional black mask that absorbs a part of the irradiation light is replaced with a part of the absorbed irradiation light which is reflected or refracted toward the pixel. Use efficiency increases. Therefore, when applied to a liquid crystal display panel, the display becomes brighter or the power consumption of the light source can be reduced.

[0014]

FIG. 2 is a schematic diagram of the main structure of a first embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel, and FIG. 3 is an explanation of the method of forming a reflecting surface in the first embodiment of the present invention. It is a figure.

In FIG. 2 in which the same reference numerals are used for the same parts as those in the above-mentioned drawing, the liquid crystal display panel 25 includes glass substrates 2 and 7,
A large number of pixels 4R, 4G and 4B formed on the surface of the substrate 2, a top coat layer 5 filling the gaps 20 between pixels, a transparent electrode 6 formed on the top coat layer 5, a transparent electrode formed on the back surface of the glass substrate 7. 8, a liquid crystal 10 filled between the glass substrates 2 and 7 facing each other, a polarizing plate 12 formed on the back surface of the glass substrate 2, a polarizing plate 13 formed on the front surface of the glass substrate 7, and a pair of alignment films 14 and 15
And the like. The reflecting surface 21 _-1 having a V-shaped cross section facing the formation gap 20 of each pixel 4R, 4G, 4B is formed by the conventional black mask 3
It is formed by changing to.

The color filter composed of the pixels 4R, 4G, 4B and the reflecting surface 21 _-1 is first provided with a large number of V-shaped grooves 26 in cross section on the surface of the substrate 2 as shown in FIG. Then, as shown in FIG. 3B, a reflective film (reflective surface) 21 _-1 made of metal chrome, aluminum or the like is formed on the inner surface of the V groove 26, and then a filler 27 made of resin or the like is applied to the V groove 26. groove
26, and then, as shown in FIG. 3C, the pixel 4R,
Form 4G, 4B.

In such a liquid crystal display panel 25, a part of the irradiation light 19 emitted from the back surface of the glass substrate 2 has pixels 4R and 4R.
G, 4B and the irradiation, another part of the irradiation light 19 irradiating the reflecting surface 21 _-1 illuminates pixel 4R is reflected by the reflecting surface 21 _-1, 4G, in 4B.

FIG. 4 is a schematic diagram of the main constitution in a second embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel, and FIG. 5 is an explanatory view of a method of forming a reflecting surface in the second embodiment of the present invention. Is.

In FIG. 4, which uses the same reference numerals as those used in the previous figure, the liquid crystal display panel 31 includes glass substrates 2 and 7,
A large number of pixels 4R, 4G and 4B formed on the surface of the substrate 2, a top coat layer 5 filling the gaps 20 between pixels, a transparent electrode 6 formed on the top coat layer 5, a transparent electrode formed on the back surface of the glass substrate 7. 8, a liquid crystal 10 filled between the glass substrates 2 and 7 facing each other, a polarizing plate 12 formed on the back surface of the glass substrate 2, a polarizing plate 13 formed on the front surface of the glass substrate 7, and a pair of alignment films 14 and 15
And the like. The reflecting surface 21 _-2 having a V-shaped cross section facing the formation gap 20 of each pixel 4R, 4G, 4B is formed by the conventional black mask 3
It is formed by changing to.

The color filter constituted by the pixels 4R, 4G, 4B and the reflecting surface 21 _-2 is first provided with a large number of V-shaped cross-section projections 32 on the back surface of the substrate 2 by etching, for example, as shown in FIG. Then, as shown in FIG. 5B, a reflection film (reflection surface) 21 _-2 made of metal chrome or aluminum is formed on the slope of the protrusion 32, and then the substrate is formed as shown in FIG. 5C. Two
Pixels 4R, 4G and 4B are formed on the surface of.

In such a liquid crystal display panel 31, a part of the irradiation light 19 emitted from the back surface of the glass substrate 2 has pixels 4R and 4R.
G, 4B and the irradiation, another part of the irradiation light 19 irradiating the reflecting surface 21 _-2, illuminates the pixels 4R is reflected by the reflecting surface 21 _-2, 4G, in 4B.

FIG. 6 is a schematic diagram of the main constitution in a third embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel, and FIG. 7 is a fourth diagram in which the method of the present invention is applied to a color filter for a liquid crystal display panel. FIG. 8 is a schematic diagram of a main constitution in an embodiment, FIG. 8 is a schematic diagram of a main constitution in a fifth embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel,
FIG. 9 is a schematic view of the main constitution of the fifth embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel, and FIG.
11 is a schematic diagram of the main constitution in a sixth embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel, and FIG. 11 is a main constitution in a seventh embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel. FIG.

In FIG. 6 in which the same reference numerals are used for the same parts as those in the above-mentioned drawing, the liquid crystal display panel 41 includes glass substrates 2 and 7,
A large number of pixels 4R, 4G and 4B formed on the surface of the substrate 2, a top coat layer 5 filling the gaps 20 between pixels, a transparent electrode 6 formed on the top coat layer 5, a transparent electrode formed on the back surface of the glass substrate 7. 8, a liquid crystal 10 filled between the glass substrates 2 and 7 facing each other, a polarizing plate 12 facing the back surface of the glass substrate 2, a polarizing plate 13 formed on the front surface of the glass substrate 7, and a pair of alignment films 14 and 1
5. A resin member 42 or the like having a reflecting surface 21 _-3 having a V-shaped cross section and facing the inter-pixel gap 20 and corresponding to the conventional black mask 3.

The plate-shaped resin member 42 is integrally formed with a V-shaped projection 43 having a V-shaped cross section, which faces the inter-pixel gap 20, and then a reflection film (reflection surface) 21 made of metal chrome, aluminum or the like on the slope of the projection 43. Form _-3 .

In the liquid crystal display panel 35, a part of the irradiation light 19 emitted from the back surface of the glass substrate 2 has pixels 4R and 4R.
G, 4B and the irradiation, another part of the irradiation light 19 irradiating the reflecting surface 21 _-3 illuminates pixel 4R is reflected by the reflecting surface 21 _-3, 4G, in 4B.

In FIG. 7, in which the same reference numerals are used for the same parts as those in the above-mentioned drawing, the liquid crystal display panel 45 includes glass substrates 2 and 7,
A large number of pixels 4R, 4G and 4B formed on the surface of the substrate 2, a top coat layer 5 filling the gaps 20 between pixels, a transparent electrode 6 formed on the top coat layer 5, a transparent electrode formed on the back surface of the glass substrate 7. 8, a liquid crystal 10 filled between the glass substrates 2 and 7 facing each other, a polarizing plate 12 facing the back surface of the glass substrate 2, a polarizing plate 13 formed on the front surface of the glass substrate 7, and a pair of alignment films 14 and 1
5. A resin member 46 having a V-shaped cross-section reflecting surface 21 _-4 corresponding to the conventional black mask 3 and the like.

The resin member 46 facing the inter-pixel gap 20 is formed with a reflection film (reflection surface) 21 _-4 made of metal chrome, aluminum or the like on its slope before being joined to the back surface of the glass substrate 2. To do.

In the liquid crystal display panel 45, a part of the irradiation light 19 irradiated from the back surface of the glass substrate 2 is a part of the pixels 4R, 4.
G, 4B and the irradiation, another part of the irradiation light 19 irradiating the reflecting surface 21 _-4, illuminates the pixels 4R is reflected by the reflecting surface 21 _-4, 4G, in 4B.

In FIG. 8 in which the same reference numerals are used for the same parts as in the above-mentioned drawing, the liquid crystal display panel 51 includes glass substrates 2 and 7,
A large number of pixels 4R, 4G and 4B formed on the surface of the substrate 2, a transparent electrode 6 formed on the top coat layer 5, a transparent electrode 8 formed on the back surface of the glass substrate 7, and between the glass substrates 2 and 7 facing each other. Liquid crystal 10 filled, polarizing plate 12 formed on the back surface of glass substrate 2, polarizing plate 13 formed on the surface of glass substrate 7, a pair of alignment films 14 and 15, and V-shaped cross-section projections provided on the surface of glass substrate 2. (Reverse V-shaped refracting member) 23 _-1 etc., pixel 4R
And 4G and 4B are as form fill a recess formed by the projection 52, the top coat layer 5 is planarized irregularities by the pixel 4R, 4G, 4B and the projection 23 _-1.

For the projection 23 _-1 , a light transmissive material (acrylic resin, epoxy resin, silicon resin or the like) having a smaller optical refractive index than that of the pixels 4R, 4G, 4B is used. In the liquid crystal display panel 51, a part of the irradiation light 19 irradiated from the back surface of the glass substrate 2 irradiates the pixels 4R, 4G, 4B, and another part of the irradiation light 19 irradiated to the protrusion 52 is generated from the protrusion 52. The light is refracted toward the pixels 4R, 4G, 4B, and the pixels 4R, 4G, 4B are irradiated.

In FIG. 9 in which the same reference numerals are used for the same parts as those in the above-mentioned drawing, the liquid crystal display panel 55 includes glass substrates 2 and 7,
A large number of pixels 4R, 4G and 4B formed on the surface of the substrate 2, a top coat layer 5 filling the gaps 20 between pixels, a transparent electrode 6 formed on the top coat layer 5, a transparent electrode formed on the back surface of the glass substrate 7. 8, a liquid crystal 10 filled between the glass substrates 2 and 7 facing each other, a polarizing plate 12 facing the back surface of the glass substrate 2, a polarizing plate 13 formed on the front surface of the glass substrate 7, and a pair of alignment films 14 and 1
5. It is composed of a protrusion (refractive member) 23 _-2 or the like which is joined to the back surface of the glass substrate 2 and has a V-shaped groove 57 in cross section.

The projections _23-2 are made of a light-transmitting material (acrylic resin, epoxy resin, silicon resin, etc.) having a light refractive index larger than that of air and smaller than that of the pixels 4R, 4G, 4B.

In the liquid crystal display panel 55, a part of the irradiation light 19 emitted from the back surface of the glass substrate 2 is part of the pixels 4R and 4R.
The other part of the irradiation light 19 which irradiates G, 4B and irradiates the projection 56 is refracted by the projection 56 toward the pixels 4R, 4G, 4B and irradiates the pixels 4R, 4G, 4B.

Diagram in which the same reference numerals are used in common with the above-mentioned diagram
In FIG. 10, the liquid crystal display panel 61 includes the glass substrates 2 and 7,
A large number of pixels 4R, 4G and 4B formed on the surface of the substrate 2, a top coat layer 5 filling the gaps 20 between pixels, a transparent electrode 6 formed on the top coat layer 5, a transparent electrode formed on the back surface of the glass substrate 7. 8, a liquid crystal 10 filled between the glass substrates 2 and 7 facing each other, a polarizing plate 12 facing the back surface of the glass substrate 2, a polarizing plate 13 formed on the front surface of the glass substrate 7, and a pair of alignment films 14 and 1
5. It is composed of a refracting member 23 _{-3 having a} V-shaped cross section and facing the inter-pixel gap 20 and corresponding to the conventional black mask 3.

The refracting member 23 _-3 is formed, for example, by forming a large number of V-shaped grooves in cross section on the resin plate material 62 and filling the grooves with resin. The plate material 62 has a refractive index of refraction (V groove filling resin) 23 _-3
Select and use a smaller one, and the polarizing plate 12 is a plate material
Provided on the back side of 62.

In such a liquid crystal display panel 61, a plate material 62
Part of the irradiation light 19 emitted from the back surface of the pixel is pixels 4R, 4G, 4B.
Irradiating the other part of the irradiation light 19 irradiating the refracting member 23 _-3, by passing through the refracting member 23 _-3, the pixel 4R as shown by the arrows in FIG. 10, to irradiate 4G, and 4B become.

Diagram in which the same reference numerals are used in common with the above-mentioned diagram
11, the liquid crystal display panel 65 includes the glass substrates 2 and 7,
Plate-shaped refraction member 23 _-4 , which is in close contact with the surface of the substrate 2, refraction member
A large number of pixels 4R, 4G and 4B formed on the surface of 23 _-4, a top coat layer 5 that fills the inter-pixel gap 20, a transparent electrode 6 formed on the top coat layer 5, and a transparent film formed on the back surface of the glass substrate 7. Liquid crystal filled between electrodes 8 and glass substrates 2 and 7 facing each other
10, a polarizing plate 12 bonded to the back surface of the glass substrate 2, a polarizing plate 13 bonded to the front surface of the glass substrate 7, a pair of alignment films 14 and 15, and the like.

The refraction member 23 _-4 is provided with a light refraction portion 66 facing the inter-pixel gap 20, and the light refraction index characteristic A of the refraction portion 66 is shown in FIG.
As shown in (b), it is a distribution type in which the refractive index gradually increases toward its center.

In the liquid crystal display panel 65, a part of the irradiation light 19 emitted from the back surface of the glass substrate 2 is generated by the pixels 4R and 4R.
The other part of the irradiation light 19 which irradiates G, 4B and irradiates the refraction part 66 is refracted in the refraction part 66 and irradiates the pixels 4R, 4G, 4B.

The implementation shown in FIGS. 2, 4, 6 and 7
In the example, the reflective surface 21_-1,twenty one_-2,twenty one _-3,twenty one_-FourInside (picture
On the side close to the element 4R, 4G, 4B), metal chrome or black resin
By providing a light blocking layer made of_-1，
twenty one_-2,twenty one_-3,twenty one_-FourThe reflectance of can be increased.

Further, according to the present invention, the reflecting surfaces 21 _-1 , 21 _-2 ,
21 _-3 and 21 _-4 can be replaced with an optical scattering surface. The scattering surface is irradiated by the reflecting surface 21 _-1 , 21 _-2 , 21 _-3 , 21 _-4.
Although the use efficiency of 19 is lower, brighter display is possible than using a conventional black mask, and it becomes more effective by providing the light blocking layer.

[0042]

As described above, according to the method of the present invention, the utilization efficiency of the irradiation light is increased, and when applied to a liquid crystal display panel, the display is bright, the backlight device is small and lightweight, and the power consumption is low. The effect of improving the viewing angle characteristics is that since a part of transmitted light becomes oblique light.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a color filter according to the present invention.

FIG. 2 is a schematic diagram of a main configuration in a first embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 3 is an explanatory diagram of a reflective surface forming method according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram of a main configuration in a second embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 5 is an explanatory diagram of a reflecting surface forming method according to the second embodiment of the present invention.

FIG. 6 is a schematic diagram of a main configuration in a third embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 7 is a schematic diagram of a main configuration in a fourth embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 8 is a schematic diagram of a main configuration in a fifth embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 9 is a schematic diagram of a main configuration in a sixth embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 10 is a schematic diagram of a main configuration in a seventh embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 11 is a schematic diagram of a main configuration in an eighth embodiment in which the method of the present invention is applied to a color filter for a liquid crystal display panel.

FIG. 12 is a schematic cross-sectional view showing the main configuration of an STN type color liquid crystal display panel using a conventional color filter.

[Explanation of symbols]

2 is a transparent substrate forming pixels for color display 4,4R, 4G, 4B Pixels for color display 19 are irradiation lights for irradiating color filters 20 are gaps between pixels 21, 21 _-1 , 21 _-2 , 21 _-3 , 21 _-4 is a reflecting surface that reflects a part of the irradiation light toward the pixel 22 is a scattering surface that reflects a part of the irradiation light 23, 23 _-1 , 23 _-2 , 23 _-3 , 23 _-4 is an irradiation surface Refractive members 25, 31, 41, 45, 51, 55, 61 and 65 for refracting part of light toward pixels are liquid crystal display panels using the color filter of the present invention.

Claims (9)

[Claims] 1. A large number of color displays on the surface of a transparent substrate (2).
Forming pixels (4, 4R, 4G, 4B) for use in transmitting the substrate (2)
Part of the irradiation light (19) that irradiates the pixel (4, 4R, 4G, 4B)
Inclined reflective surface (21,21_-1,twenty one
_-2,twenty one_-3,twenty one _-Four) In the gap (20) between the plurality of pixels.
A color filter characterized by being provided with a crimp. 2. A large number of color display pixels (4,4R, 4G, 4B) are formed on the surface of a transparent substrate (2), and the pixels (4,4R, 4G, 4G, 4G, 4B) are transmitted through the substrate (2). A color filter characterized in that an inclined scattering surface (22) on which a part of the irradiation light (19) for irradiating 4B) is scattered is provided corresponding to the large number of inter-pixel gaps (20). 3. A large number of color display pixels (4, 4R, 4G, 4B) are formed on the surface of a transparent substrate (2), and the pixels (4, 4R, 4G, 4G, 4G, 4B) are transmitted through the substrate (2). Part of the irradiation light (19) that irradiates 4B) is the pixel.
The refraction members (23, 23 _-1 , 23 _-2 , 23 _-3 , 23 _-4 ) having a V-shaped cross section that are refracted toward (4, 4R, 4G, 4B) and are transmitted through the plurality of inter-pixel gaps ( 20) A color filter characterized by being provided so as to face it. 4. The inter-pixel gap (20) of the reflecting surface according to claim 1.
The color filter according to claim 1, wherein a light blocking layer is provided on the facing surface. 5. The reflection surface (21 _-1 ) facing the inter-pixel gap (20) has a V-shaped groove in cross section on the surface of the transparent substrate (2).
The color filter according to claim 1 or 4, wherein (26) is formed and is adhered to the V-shaped surface of the groove (26). 6. The reflection facing the interpixel gap (20).
Face (21_-2,twenty one_-3,twenty one _-Four) Is the back surface of the transparent substrate (2).
Protrusions (32, 43, 46) with a V-shaped cross section
Characterized by being attached to the V-shaped surface of (32,43,46)
The color filter according to claim 1 or 4. 7. The inter-pixel gap (20) on the scattering surface according to claim 2.
The color filter according to claim 2, wherein a light blocking layer is provided on the opposite surface. 8. The color filter according to claim 3, wherein the refraction member (23 _-1 ) according to claim 3 projects from the surface of the transparent substrate (2). 9. The refraction member according to claim ₃ , (23 _-2 , 23 _-3 ,
23 _-4 ) is provided outside the back surface of the transparent substrate (2).