JP2007133343A - Color filter with excellent light emission luminance and color contrast - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter having improved light emission luminance and improved color contrast. <P>SOLUTION: A black matrix 33 comprising a light shielding member is disposed on a part of the upper surface of a transparent substrate 31, while a light transmitting portion where no light shielding member is formed is formed as a pixel 38, each pixel 38 being provided inside with a color resist 35 in at least one of primary three colors and with a light transmitting gap 36. By obtaining synthesized light of rays having a decreased luminance by passing through the color filter and the light having high luminance from the light source and transmitting through the gap, the luminance can be improved as well as the color contrast can be increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a color filter, and in particular, by setting a gap, the luminance of light from a light source that is transmitted is not affected, and the light emission luminance and color contrast that can increase the color contrast of the light from the light source that is transmitted. It relates to an excellent color filter.

The development of the optoelectronic industry has brought more convenience to people. However, how to produce a higher-quality, lower-cost flat display has always been a goal of each manufacturer, and how to display full color is the key to successful display production. In the organic EL display device, the following two methods are employed to achieve full color.

1 A method in which an organic light emitting diode capable of generating red (R), green (G), and blue (B) is installed in each pixel to emit light and directly obtain a full color effect.
2 A method of obtaining a full color effect by combining a white organic light emitting diode with a color filter, which is a mature technology, and filtering a white light source with the color filter.

  1 and 2 show a structure in which light color filtering is performed by a color filter in the prior art. As shown in the figure, a black matrix (light shielding member) 13 is provided on a part of the surface of the transparent substrate 11, and a plurality of color resists 15 are provided on the surface of the transparent substrate 11 where the black matrix 13 is not provided. Light color conversion is performed. Further, a protective layer 17 and a barrier layer 19 are sequentially laminated above the black matrix 13 and the color resist 15 to protect the color resist 15 and the black matrix 13 and are convenient for subsequent manufacturing steps.

  When filtering the light color of the white light S generated from the organic light emitting diode 20 using the color filter 10, the lower electrode 21 and the counter electrode 25 of the organic light emitting diode 20 installed on the upper surface of the barrier layer 19 are used. The organic light emitting diode 23 generates white light S by current conduction. The white light S passes through the first color resist 151, the second color resist 153, and the third color resist 155, and then becomes the first color light L1, the second color light L2, and the third color light L3, respectively.

  Further, when the white light S passes through the color resist 15, the brightness and color contrast of each color light (L 1, L 2, L 3) are affected by the thickness H of the color resist 15. For example, when the thickness H of the first color resist 151 increases, the first color light L1 generated after the white light S passes through the first color resist 151 has a suitable color contrast. However, as the thickness H of the first color resist 151 increases, the luminance of the first color light L1 decreases, and the luminance of the organic EL device 100 is affected. On the contrary, when the thickness H of the first color resist 151 decreases, the luminance of the first color light L1 increases, but the color contrast of the organic EL device 100 is affected. Therefore, when light color filtering is performed using the color filter 10, either the luminance or the color contrast is sacrificed in each color light (L1, L2, L3) generated by the filtering.

The inventor of the present invention has devised a color filter that can increase the color contrast of each color light without affecting the luminance of each color light in view of the above-mentioned drawbacks of the prior art.
JP 2005-331796 A

A first object of the present invention is to provide a color filter in which at least one gap portion is provided at the same time that a color resist is placed inside a single pixel, and the luminance of each color light can be increased by the provision of the gap portion. is there.
The second object of the present invention is to install a color resist inside a single pixel and provide at least one gap portion, and the thickness of the color resist is not affected by the placement of the gap portion. The object is to provide a color filter in which color contrast is maintained.
A third object of the present invention is to install at least one gap portion and at least one color resist inside a single pixel, and the gap portions are alternately arranged so as to cross each color light in the single pixel. An object of the present invention is to provide a color filter capable of increasing the uniformity of the color.
A fourth object of the present invention is to provide a color filter in which at least one light transmitting portion is formed on the upper surface of a part of a transparent substrate before the color resist is installed, and is convenient for localization and formation of the color resist. Is to provide.

In order to solve the above problems, the invention of claim 1 includes a transparent substrate, a black matrix, at least one color resist and a protective layer, and the black matrix is disposed on a partial surface of the transparent substrate. A plurality of pixels are formed on a transparent substrate that is not provided, the color resist is fixed to a part of the surface of the transparent substrate in the pixel, and at least one region in the part where the color resist in the pixel is not provided A gap is formed, and the protective layer is a color filter excellent in light emission luminance and color contrast, characterized by covering the upper surface of the black matrix and the color resist.

  According to a second aspect of the present invention, a translucent part is provided on the gap in the pixel, the translucent part is made of a translucent material, and the total area of the first gap and the second gap is the pixel. 2. The color filter excellent in light emission luminance and color contrast according to claim 1, wherein the color filter has a surface area smaller than one half of the surface area.

  The invention according to claim 3 is the color filter excellent in light emission luminance and color contrast according to claim 1, wherein the surface area of the gap in the pixel is smaller than the surface area of the color resist.

  According to a fourth aspect of the present invention, the color filter is used in a liquid crystal display device, an organic EL display device or a plasma display device, and is a color filter excellent in light emission luminance and color contrast.

By setting the gap, the luminance of light from the light source that is transmitted is not affected, and the color contrast of the light from the light source that is transmitted can be increased.

Examples illustrating the features, structure and effects achieved of the present invention are shown below with reference to the drawings.

FIG. 3 is a plan view showing a color filter according to an embodiment of the present invention. FIG. 4 is a cross-sectional view showing a state in which a color filter according to an embodiment of the present invention is used in an organic EL device. FIG. 5 is a longitudinal sectional view of FIG. As shown in the figure, in the color filter 30 having excellent light emission luminance and color contrast of this embodiment, at least one black matrix 33 is provided on a partial surface of a transparent substrate 31. A plurality of pixels 38 are formed on a transparent substrate 31 on which the black matrix 33 is not provided, at least one color resist 35 is provided in a partial area in the pixel 38, and the color resist 35 in the pixel 38 is provided. At least one gap 36 is formed in other areas that are not formed. Further, a protective layer 37 and / or a barrier layer 39 are coated on the black matrix 33 and the color resist 35, and the color resist 35, the black matrix 33, and the gap 36 are protected by the protective layer 37 and / or the barrier layer 39. The When forming the protective layer 37, the protective layer 37 material can also be disposed inside the gap 36.

The color filter 30 performs light color filtering in the organic EL device 300. A plurality of organic light emitting diodes 40 (OLEDs) are disposed on a partial surface of the barrier layer 39 of the color filter 30, and the lower electrode 41 of the organic light emitting diode 40 and the barrier layer 39 are connected. The organic light emitting layer 43 and the counter electrode 45 are sequentially stacked on the upper surface of the lower electrode 41, and when an operating current is supplied between the lower electrode 41 and the counter electrode 45, the organic light emitting layer 43 emits white light S. The organic light emitting diode 40 emits light.

The white light S projected by the organic light emitting diode 40 passes through the color filter 30, but first passes through the color resist 35 and the gap 36. The white light S that has passed through the color resist 35 becomes color light according to the color of the color resist 35, and the white light S that does not pass through the color resist 35 passes through the transparent substrate 31 directly from the gap portion 36 and is emitted outside the color filter 30. The For example, after the white light S generated from the organic light emitting diode 40 passes through the first color resist 351, the second color resist 353, and the third color resist 355, the first color light L1 (red light), The second color light L2 (green light) and the third color light L3 (blue light) are obtained. Further, a part of the white light S passes through the transparent substrate 31 directly from the gap portion 36. The first pixel 381 has first color light L1 and white light L, the second pixel 383 has second color light L2 and white light L, and the third pixel 385 has first color light L1 and white light L. 3 color lights L3 and white light L.

The color contrast of each color light (L 1, L 2, L 3) generated after the white light S passes through the color resist 35 is directly proportional to the thickness H of the color resist 35. That is, as the thickness H of the color resist 35 increases, the color contrast of each color light (L 1, L 2, L 3) increases simultaneously, and the increase in color contrast is beneficial for improving the display quality of the organic EL device 300. However, an increase in the thickness H of the color resist 35 means that the color resist 35 filters most of the white light S, and each color light (L1, L2,. The intensity and brightness of L3) is reduced. However, since the gap portion 36 is formed, a part of the white light S passes through the transparent substrate 31 directly from the gap portion 36 and is emitted to the outside of the color filter 30, and the light is emitted from each color light (L1, L2, L3). ) To increase the emission luminance of each color light.

Taking the first pixel 381 as an example, the surface area A1 of the gap 36 is preferably smaller than the surface area A2 of the color resist 351. That is, the surface area A1 of the gap 36 is smaller than half the surface area A of the first pixel 381. For example, in the structure of the prior art, the luminance (Luminance) of the white light S emitted from the organic light emitting diode 10 is 100 nits, the transmittance of the white light S of the first color resist 151 is 10%, When the device does not consider reducing the light intensity with respect to the white light S, the white light S is generated through the first color resist 151 of the first pixel 181 in which the gap 36 is not provided. The first color light L1 is only one-tenth of the white light S, that is, the luminance of the first color light L1 is only 10 nits.

In the case of the color filter 30 of the present embodiment, when the luminance of the white light S emitted from the organic light emitting diode 40 is 100 nits, the transmittance of the white light S of the first color resist 351 is 10%, Since the first color resist 351 occupies only three-quarters of the surface area of the first pixel 381, white light can be used unless other devices reduce the light intensity with respect to the white light S. The luminance after S has passed through the first color resist 351 and the gap 36 is
(100 × 0.1) × 0.75 + (100 × 1) × 0.25 = 32.5 nits
It becomes.

  As can be seen from the above calculation formula, regarding the first color resist 151 and the first color resist 351 having the same thickness H, the surface area A1 occupied by the gap 36 is four of the surface area A of the first pixel 381. The luminance exhibited by the first pixel 381 provided with the gap 36 is 3.25 times that of the first pixel 181 provided with no gap 36.

  As can be seen from this, the luminance of each color light can be effectively increased by the provision of the gap 36. In addition, even if the gap portion 36 is provided, the color light after the white light S has passed through the color resist 35 provided with the gap portion 36 and the gap can be sensed with the naked eye without changing the thickness H of the color resist 35. The color light after passing through the color resist 15 where the portion 36 is not provided has the same color contrast, and the light emission luminance and color contrast of each color light can be increased simultaneously by providing the gap portion 36.

  FIG. 6 is a plan view showing a color filter according to a second embodiment of the present invention. As shown in the figure, in the color filter 50 of this embodiment, a plurality of pixels 38 are formed on a transparent substrate 31 on which the black matrix 33 is not formed, and at least one color is formed in a partial area in the pixel 38. A plurality of gaps 56 are formed in other areas where the resist 35 is provided and the color resist 35 is not provided in the pixel 38. For example, the third color resist 355 is provided in a partial area of the third pixel 385, and the first gap portion 561 and the second gap portion are provided in an area where the third color resist 355 is not provided. 563 is formed.

  Since the first gap portion 561 and the second gap portion 563 are installed in separate areas, each color light (L1, L2, L3) and the white light L are mixed more uniformly. In principle, the total area of the first gap 561 and the second gap 563 in the pixel 38 does not exceed the surface area of the color resist 35.

  FIG. 7 is a plan view showing a color filter according to a third embodiment of the present invention. FIG. 8 is a longitudinal sectional view showing a state in which the color filter according to the above-described embodiment of the present invention is used in an organic EL device. As shown in the figure, in the color filter 60 excellent in light emission luminance and color contrast of this embodiment, a plurality of pixels 38 are formed on a light-transmitting substrate 31 on which the black matrix 33 is not formed. A plurality of color resists 35 are provided in the partial area, and at least one gap portion 66 is formed in the other area in the pixel 38 where the color resist 35 is not provided. Each gap portion 66 is installed at each position of each pixel 38 in a manner of alternately intersecting, and similarly, the uniformity of each color light can be increased.

  Further, a translucent portion 665 can be added on the gap portion 66 in each pixel 38, which is convenient for positioning and arrangement of the color resist 35. The light transmitting portion 665 can be installed on a part of the upper surface of the transparent substrate 31 before the color resist 35 is formed.

  In each of the embodiments of the present invention, all the embodiments were applied to an organic EL device. However, the application target of the color filter of the present invention is not limited to the organic EL device, and various displays such as a liquid crystal display device or a plasma display device The organic EL device, the liquid crystal display device or the plasma display device is installed on the surface of the color filter.

As can be seen from the above detailed description, the present invention relates to a color filter, and in particular, the brightness of light from the light source that is transmitted is not affected by the provision of the gap, and the color contrast of the light from the light source that is transmitted is increased. The present invention relates to a color filter excellent in emission luminance and color contrast that can be used, has novelty and inventive steps, is an industrially applicable invention, and has patent requirements.

  The above detailed description shows preferred embodiments of the present invention, and does not limit the scope of the present invention, but changes and modifications of equivalent effects based on the shape, structure, features, and gist of the present invention. Etc. are all included in the present invention.

It is a top view which shows the color filter by a prior art. It is sectional drawing which shows the color filter by a prior art. 1 is a plan view illustrating a color filter according to an embodiment of the present invention. It is a cross-sectional view showing a state where a color filter according to an embodiment of the present invention is used in an organic EL device. It is a longitudinal cross-sectional view of FIG. It is a top view which shows the color filter by the 2nd Example of this invention. It is a top view which shows the color filter by the 3rd Example of this invention. It is a longitudinal cross-sectional view which shows the state which used the color filter by the above-mentioned Example of this invention for an organic electroluminescent apparatus.

Explanation of symbols

10 color filter 100 organic EL device 11 transparent substrate 13 black matrix 15 color resist 151 first color resist 153 second color resist 155 third color resist 17 protective layer 181 first pixel 19 barrier layer 20 organic light emitting diode 21 Lower electrode 23 Organic light emitting layer 25 Counter electrode 30 Color filter 300 Organic EL device 31 Transparent substrate 33 Black matrix 35 Color resist 351 First color resist 353 Second color resist 355 Third color resist 36 Gap portion 37 Protective layer 38 Pixel 381 First pixel 383 Second pixel 385 Third pixel 39 Barrier layer 40 Organic light emitting diode 41 Lower electrode 43 Organic light emitting layer 45 Counter electrode 50 Color filter 56 Gap 561 First gap 563 2 of the gap portion 60 a color filter 66 a gap portion 665 transparent portion

Claims (4)

A transparent substrate, a black matrix, at least one color resist and a protective layer;
The black matrix is formed on a partial surface of the transparent substrate, and a plurality of pixels are formed on a transparent substrate on which the black matrix is not formed,
The color resist is formed on a part of the surface of the pixel, and in the part of the pixel where the color resist is not provided, at least one gap where no color resist is formed is formed,
The color filter excellent in light emission luminance and color contrast, wherein the protective layer covers upper surfaces of the black matrix and the color resist.   A translucent part is provided on the gap in the pixel, the translucent part is made of a translucent material, and the total area of the first gap and the second gap is a half of the surface area of the pixel. The color filter excellent in light emission luminance and color contrast according to claim 1, wherein the color filter is smaller than one.   2. The color filter having excellent light emission luminance and color contrast according to claim 1, wherein the surface area of the gap in the pixel is smaller than the surface area of the color resist. The color filter according to claim 1, wherein the color filter is used in a liquid crystal display device, an organic EL display device, or a plasma display device.

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