Color filter, LCD panel and single-chip LCD projector

Abstract

The present invention discloses a color filter, an LCD panel and a single-chip LCD projector, and relates to the field of projection technology. The color filter includes: a first area and a second area, the first area is close to a first edge of the color filter, and the second area is close to a second edge of the color filter opposite to the first edge; the first area includes a plurality of first pixels, the second area includes a plurality of second pixels, each first pixel and each second pixel respectively includes a first sub-pixel, a second sub-pixel and a third sub-pixel; the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are arranged in a direction from the first edge toward the second edge; the first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel are arranged in a direction from the second edge toward the first edge. The scheme of the present invention adopts different arrangements for the sub-pixels in the first area and the second area to compensate for the chromatic aberration of the projection lens itself, thereby eliminating the chromatic aberration of the projection image.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and in particular to a color filter, an LCD panel and a single-chip LCD projector. Background Art

[0002] In a single-chip LCD projection, the light source is usually white light, and color display is achieved through the pixel segmentation method on the LCD panel. Each white light pixel of the LCD panel is actually composed of three RGB sub-pixels. The three sub-pixels are separated in space, and a layer of color filter (CF: Color Filter) is added to each sub-pixel. By controlling the distance between the three sub-pixels, the human eye cannot separate the sub-pixels at a certain distance. The R, G, and B primary color sub-pixels of the color filter are arranged in a certain pattern and correspond one-to-one with the TFT sub-pixels on the TFT substrate. The white light emitted by the light source is filtered by the color filter and becomes the corresponding R, G, and B color light. The voltage value applied to each sub-pixel is adjusted through the TFT array, thereby changing the transmission intensity of each color light, and RGB color lights of different intensities are mixed together to achieve color display.

[0003] The common pixel arrangements of color filters on the market are divided into stripe arrangement, mosaic arrangement and delta arrangement.

[0004] The refractive index of the projection lens for different colored lights emitted by the LCD panel varies with the wavelength of the light, so that the optimal imaging positions corresponding to the R, G, and B colored lights of the projection lens under a large field of view do not strictly coincide. The vertical axis chromatic aberration is generally used to measure the color deviation caused by the lens. The lens design can be specially designed by controlling the optical materials and surface shapes used to control the chromatic aberration parameters within a certain range, but it still cannot solve the defects of color aberration caused by the height difference caused by pixel separation and the refractive index, and the picture quality is poor. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a color filter, an LCD panel and a single-chip LCD projector in view of the deficiencies in the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A color filter, comprising: a first region and a second region;

[0008] The first area is close to a first edge of the color filter, and the second area is close to a second edge of the color filter opposite to the first edge;

[0009] The first area includes a plurality of first pixels, the second area includes a plurality of second pixels, each of the first pixels and each of the second pixels includes a first sub-pixel, a second sub-pixel and a third sub-pixel respectively;

[0010] The first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are arranged along a direction from the first edge toward the second edge;

[0011] The first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel are arranged along a direction from the second edge toward the first edge.

[0012] Further, the first sub-pixel is a blue sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a red sub-pixel.

[0013] Furthermore, a plurality of blue sub-pixels arranged along a straight line are provided at the boundary between the first area and the second area.

[0014] Further, the first sub-pixels, the second sub-pixels and the third sub-pixels in the plurality of the first pixels and the plurality of the second pixels are arranged to form a first sub-pixel row, a second sub-pixel row and a third sub-pixel row, respectively.

[0015] Further, the areas of the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel and the second pixel are equal.

[0016] Further, the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are symmetrical with the first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel about the center line of the color filter.

[0017] Furthermore, each of the first pixels and each of the second pixels further includes a fourth sub-pixel;

[0018] The fourth sub-pixel in the first pixel is located on a side of the third sub-pixel thereof facing away from the first edge;

[0019] The fourth sub-pixel in the second pixel is located on a side of the third sub-pixel thereof facing away from the second edge.

[0020] Furthermore, the fourth sub-pixel is a white sub-pixel.

[0021] The beneficial effect of the present invention is that the present scheme rearranges the arrangement order of the sub-pixels of the first pixel in the first area and the sub-pixels of the second pixel in the second area of ​​the color filter, so that the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are arranged in a direction from the first edge toward the second edge, and the first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel are arranged in a direction from the second edge toward the first edge, so as to compensate for the chromatic aberration of the projection lens itself, offset the height difference caused by the sub-pixel separation and the height difference caused by the refractive index, and thus achieve the elimination of chromatic aberration.

[0022] Another technical solution of the present invention to solve the above technical problems is as follows:

[0023] An LCD panel comprises: a color filter according to any of the above solutions.

[0024] Another technical solution of the present invention to solve the above technical problems is as follows:

[0025] A single-chip LCD projector comprises: a light source, a projection lens and an LCD panel as in the above scheme; the LCD panel is arranged between the light source and the projection lens.

[0026] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the optical path of an existing single-chip LCD projector;

[0028] Figure 2 A schematic diagram of the optical path of a single-chip LCD projector provided in one embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the arrangement of sub-pixels in a color filter provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the arrangement of sub-pixels in a color filter provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0032] In existing single-chip LCD projectors, the RGB sub-pixels of the color filter in the LCD panel are arranged in order from top to bottom in the entire area. Due to the vertical axis chromatic aberration of the projection lens and the RGB pixel separation on the LCD panel, chromatic aberration compensation will appear on one side of the screen and chromatic aberration amplification will appear on the other side. Figure 1 As shown, Figure 1 The schematic diagram of the optical path of an existing single-chip LCD projector includes an LCD panel 10 and a projection lens 20. The LCD panel 10 includes a color filter, and the RGB sub-pixels on the color filter are arranged in sequence from top to bottom. The refractive index of red light in the projection lens is relatively low, and the refractive index of blue light in the projection lens is relatively high. When the light reaches the imaging surface 30, due to the different refractive indices of light of different wavelengths, the final height difference of the landing point on the vertical axis is also different accordingly. The refractive index of red light is low and the height difference is small; the refractive index of blue light is high and the height difference is large. In the area above the projection screen, the increase in the height difference reduces the pixel separation, resulting in chromatic aberration compensation. In the area below the projection screen, due to the pixel separation and the different height differences of the pixel points, the chromatic aberration is further amplified, affecting the quality of the projection screen.

[0033] In order to solve the above problems, an embodiment of the present invention provides a color filter, which is applied to a single-chip LCD projector, and includes: a first area and a second area;

[0034] The first area is close to a first edge of the color filter, and the second area is close to a second edge of the color filter opposite to the first edge;

[0035] The first area includes a plurality of first pixels, the second area includes a plurality of second pixels, each of the first pixels and each of the second pixels includes a first sub-pixel, a second sub-pixel and a third sub-pixel respectively;

[0036] The first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are arranged along a direction from the first edge toward the second edge;

[0037] The first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel are arranged along a direction from the second edge toward the first edge.

[0038] This solution rearranges the arrangement order of the sub-pixels of the first pixel in the first area and the sub-pixels of the second pixel in the second area of ​​the color filter, so that the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are arranged in a direction from the first edge toward the second edge, and the first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel are arranged in a direction from the second edge toward the first edge, so as to compensate for the chromatic aberration of the projection lens itself, offset the height difference caused by the sub-pixel separation and the height difference caused by the refractive index, thereby eliminating the chromatic aberration.

[0039] Color filter is an important component of LCD panel and a key component that affects the display effect. The color filter includes a black matrix (BM), a color filter layer, a flat layer (OC), and a conductive layer (common electrode) formed on a glass substrate.

[0040] like Figure 2 As shown, Figure 2 The optical path schematic diagram of a single-chip LCD projector provided in an embodiment of the present invention includes a light source 40, an LCD panel 50 and a projection lens 60. The LCD panel 50 is disposed between the light source 40 and the projection lens 60. The light emitted by the light source 40 is modulated by the LCD panel 50 and then projected by the projection lens 60 to form a projection image on an imaging surface 70. The LCD panel 50 includes a color filter, and the color filter includes a first area 51 and a second area 52. The first area 51 is close to a first edge 53 of the color filter, and the second area 52 is close to a second edge 54 of the color filter. The first edge 53 and the second edge 54 are the opposite edges of the color filter, for example, the first edge 53 is the upper edge of the color filter, and the second edge 54 is the lower edge of the color filter. At this time, the first area 51 is the upper area of ​​the color filter close to the upper edge, and the second area 52 is the lower area of ​​the color filter close to the lower edge. It is understandable that the first edge 53 and the second edge 54 may also be other opposite edges of the color filter, which is not specifically limited here.

[0041] The first region 51 includes a plurality of first pixels, and the second region 52 includes a plurality of second pixels, each of the first pixels and each of the second pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel respectively; the first sub-pixel, the second sub-pixel, and the third sub-pixel in the first pixel are arranged along a direction from the first edge toward the second edge; the first sub-pixel, the second sub-pixel, and the third sub-pixel in the second pixel are arranged along a direction from the second edge toward the first edge. Figure 3 As shown, Figure 3The schematic diagram of the arrangement of each sub-pixel in the color filter of this embodiment is shown in FIG. 1 , where the first sub-pixel is a blue sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a red sub-pixel. In the first area 51, the blue sub-pixel in each first pixel is located near the first edge 53, and the red sub-pixel is located far from the first edge 53; similarly, in the second area 52, the blue sub-pixel in each second pixel is located near the second edge 54, and the red sub-pixel is located far from the second edge 54. That is, the blue sub-pixel, green sub-pixel and red sub-pixel of the first pixel in the first area 51 are arranged from top to bottom, and the blue sub-pixel, green sub-pixel and red sub-pixel of the second pixel in the second area 52 are arranged from bottom to top, so that the blue light, green light and red light passing through the first area 51 and the second area 21 of the color filter have the same height difference after being refracted by the projection lens 60, and the height difference caused by the separation of the sub-pixels and the height difference caused by the refractive index are offset, thereby achieving the elimination of color difference.

[0042] In other embodiments, the colors of the first sub-pixel, the second sub-pixel, and the third sub-pixel may be distributions of other colors, for example, the first sub-pixel is a red sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a blue sub-pixel, or the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel, etc. It can be understood that it is only necessary for the first sub-pixel, the second sub-pixel, and the third sub-pixel to be different primary colors of R, G, and B. By adjusting the arrangement positions of sub-pixels of different colors in the first region 51 and the second region 52, the height difference caused by pixel separation and the height difference caused by the refractive index are offset, and finally the color difference is eliminated.

[0043] The area ratio of the first area 51 and the second area 52 can be confirmed by determining the optimal area ratio for color fringing elimination through actual projection testing, which is associated with the chromatic aberration of the projection lens 60 .

[0044] In one embodiment, the color filter is divided into two areas by the midline, wherein the first area 51 is the area on one side of the midline of the color filter (such as the upper half area), and the second area 52 is the area on the other side of the midline of the color filter (such as the lower half area), and a plurality of blue sub-pixels arranged along a straight line are provided at the junction of the first area 51 and the second area 52, and the plurality of blue sub-pixels are arranged in a row. In this embodiment, the first area 51 and the second area 52 are transitioned through the blue sub-pixels, thereby avoiding a clear boundary between the two areas.

[0045] Preferably, in any of the above embodiments, the first sub-pixel, the second sub-pixel and the third sub-pixel in the plurality of the first pixels and the plurality of the second pixels are arranged to form a first sub-pixel row, a second sub-pixel row and a third sub-pixel row, respectively. The first sub-pixel row, the second sub-pixel row and the third sub-pixel row are parallel to each other. The first sub-pixel row may include a plurality of blue sub-pixels, which are arranged in a straight line; the second sub-pixel row may include a plurality of green sub-pixels, which are arranged in a straight line; the third sub-pixel row may include a plurality of red sub-pixels, which are arranged in a straight line. By arranging sub-pixels of the same color in the same row, the refractive index of the light passing through the sub-pixels in the same row at the projection lens is made consistent, and the chromatic aberration is compensated in the same way.

[0046] Preferably, in any of the above embodiments, the areas of the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel and the second pixel are equal.

[0047] Preferably, in any of the above embodiments, the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are symmetrical with the first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel about the midline of the color filter. By making each sub-pixel in the first pixel and each sub-pixel in the second pixel symmetrical about the midline of the color filter, the symmetrical positions of the first area and the second area can be compensated in the same manner, which can further improve the quality of the projected image.

[0048] Preferably, in any of the above embodiments, each of the first pixels and each of the second pixels further includes a fourth sub-pixel, respectively; the fourth sub-pixel in the first pixel is located on the side of its third sub-pixel facing away from the first edge; the fourth sub-pixel in the second pixel is located on the side of its third sub-pixel facing away from the second edge.

[0049] Preferably, the fourth sub-pixel is a white sub-pixel.

[0050] In another embodiment, if Figure 4 As shown in the figure, a schematic diagram of RGBW pixel arrangement is shown, where R, G, B and W represent red sub-pixels, green sub-pixels, blue sub-pixels and white sub-pixels respectively. In the upper half of the LCD panel, the sub-pixels are arranged in a BGRW manner from top to bottom, and in the lower half of the LCD panel, the sub-pixels are arranged in a BGRW manner from bottom to top, so that the height difference caused by pixel separation and the height difference caused by the refractive index are offset, and finally the color difference is eliminated. In the RGBW pixel arrangement, the W pixel can also be set at other positions, such as placing the W pixel between B and R. In this embodiment, the transition is achieved with the W pixel, and at the same time, due to the presence of the W pixel, the light transmittance of the LCD panel is improved.

[0051] In another embodiment, the present invention provides an LCD panel, comprising: a color filter according to any one of the above embodiments.

[0052] In another embodiment, the present invention further provides a single-chip LCD projector, comprising: a light source, a projection lens and an LCD panel as in the above embodiment; the LCD panel is arranged between the light source and the projection lens. Further, the single-chip LCD projector may also include optical devices such as a condenser lens, a heat-insulating glass, a polarizer, and an analyzer. The light source, the condenser lens, the heat-insulating glass, the polarizer, the LCD panel, the analyzer and the lens are arranged in sequence along the optical path.

[0053] The reader should understand that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0054] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0055] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0056] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0057] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0058] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A color filter, characterized in that: include: First and second regions; The first area is close to a first edge of the color filter, and the second area is close to a second edge of the color filter opposite to the first edge; The first area includes a plurality of first pixels, the second area includes a plurality of second pixels, each of the first pixels and each of the second pixels includes a first sub-pixel, a second sub-pixel and a third sub-pixel respectively; The first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are arranged along a direction from the first edge toward the second edge; The first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel are arranged along a direction from the second edge toward the first edge; A plurality of blue sub-pixels arranged along a straight line are provided at the boundary between the first area and the second area.

2. The color filter according to claim 1, characterized in that: The first sub-pixel is a blue sub-pixel, the second sub-pixel is a green sub-pixel, and the third sub-pixel is a red sub-pixel.

3. The color filter according to claim 1, characterized in that: The first sub-pixels, the second sub-pixels and the third sub-pixels in the plurality of the first pixels and the plurality of the second pixels are arranged to form a first sub-pixel row, a second sub-pixel row and a third sub-pixel row, respectively.

4. The color filter according to claim 3, characterized in that: The areas of the first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel and the second pixel are equal.

5. The color filter according to any one of claims 1 to 4, characterized in that: The first sub-pixel, the second sub-pixel and the third sub-pixel in the first pixel are symmetrical with the first sub-pixel, the second sub-pixel and the third sub-pixel in the second pixel about the center line of the color filter.

6. The color filter according to any one of claims 1 to 4, characterized in that: Each of the first pixels and each of the second pixels further includes a fourth sub-pixel; The fourth sub-pixel in the first pixel is located on a side of the third sub-pixel thereof facing away from the first edge; The fourth sub-pixel in the second pixel is located on a side of the third sub-pixel thereof facing away from the second edge.

7. The color filter according to claim 6, characterized in that: The fourth sub-pixel is a white sub-pixel.

8. An LCD panel, characterized in that: include: A color filter according to any one of claims 1 to 4.

9. A single-chip LCD projector, characterized in that: include: A light source, a projection lens and an LCD panel as claimed in claim 8; The LCD panel is disposed between the light source and the projection lens.

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