JP3658473B2 - LCD panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display panel driven by a dynamic or static method.
[0002]
[Prior art]
Currently, LCD devices such as airport flight information, bank and securities company interest rate / stock price display, train and bus destination guidance, etc. are used as display devices that convey information that changes in real time to users. It is starting to be widely used. A liquid crystal display panel used in this type of display device is required to have display characteristics such as a wide viewing angle, high contrast, high-speed response, and large display capacity. Therefore, in order to satisfy these required characteristics, a low-duty dynamic or static drive type liquid crystal unit is employed.
[0003]
FIG. 7 is a diagram showing a planar arrangement pattern of electrodes and wirings in a conventional liquid crystal display panel adopting a dynamic driving method. This multiplexing method is a method in which the entire screen composed of a large number of pixels arranged in a matrix is divided into several blocks, and the pixels are repeatedly displayed for each block. Here, as an example, a block D composed of 4 × 2 pixels and a block E composed of 4 × 2 pixels adjacent to the block D are shown. Note that reference numeral 90 is assigned to one of the pixels as a representative example.
[0004]
In the block D, two common electrodes 73, 74 are arranged in the horizontal direction, and four segment electrodes 79, 80, 81, 82 are arranged in the vertical direction. Eight pixels are arranged at the intersections of the common electrodes 73 and 74 and the segment electrodes 79, 80, 81 and 82. The common electrodes 73, 74 are provided with wirings 73a, 74a for applying scanning signals, and the segment electrodes 79, 80, 81, 82 are provided with wirings 79a, 80a, 81a, 82a for applying data signals. , Is provided.
[0005]
Like the block D, the block E is also provided with two common electrodes 71 and 72 in the horizontal direction, and four segment electrodes 75, 76, 77 and 78 in the vertical direction. Eight pixels are arranged at the intersections of the common electrodes 71 and 72 and the segment electrodes 75, 76, 77 and 78. The common electrodes 71, 72 are provided with wirings 71a, 72a for applying scanning signals, and the segment electrodes 75, 76, 77, 78 are provided with wirings 75a, 76a, 77a, 78a for applying data signals. Is provided.
[0006]
In such a configuration, a scanning signal is sequentially applied to the common electrodes of the blocks D and E, and a data signal is appropriately applied to each segment electrode intersecting with the common electrodes for each block, so that the liquid crystal of the entire screen is displayed. Display is possible. For example, as shown in FIG. 8, a scanning signal is applied to the common electrode 73 of the block D via the wiring 73a, and data is appropriately transmitted to the segment electrodes 79, 80, 81, 82 via the wiring 79a, 80a, 81a, 82a, respectively. By selectively applying a signal, only a desired pixel among the four pixels positioned on the common electrode 73 can be turned on. Subsequently, a scanning signal is applied to the adjacent common electrode 74 via the wiring 74a, and a data signal is selectively selectively applied to the segment electrodes 79, 80, 81 and 82 via the wiring 79a, 80a, 81a and 82a, respectively. By applying the voltage, only a desired pixel can be turned on from the four pixels positioned on the common electrode 74. In the case of such a dynamic drive method, since the scanning signal and the data signal are applied to the common electrode and the segment electrode for each block, the duty ratio of the scanning signal and the data signal can be lowered by the number of blocks. This provides advantages such as improved viewing angle and quick response.
[0007]
[Problems to be solved by the invention]
However, in the conventional dynamic or static drive type liquid crystal display panel as described above, it is necessary to pass the wirings 79a, 80a, 81a and 82a between the block D and the block E. Therefore, it is necessary to increase the interval between the blocks (for example, blocks D and E), and the pixel interval in the block and the pixel interval between the blocks are different. For example, as shown in FIG. 7, the pixel interval in block D or block E is L, while the pixel interval between block D and block E is L ′ (> L). For this reason, the display balance over the entire display image is lowered, and the display quality is deteriorated. On the other hand, if the number of pixels in the entire display image is the same and the pixel interval L in each block is increased to L ′ so as not to reduce the display balance, the size of the pixel must be reduced accordingly. There arises a problem that the dead space is widened, the aperture ratio is lowered, and the contrast is lowered. In view of such problems, an object of the present invention is to provide a liquid crystal display panel with a good display balance that does not reduce the aperture ratio of pixels and does not reduce contrast.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1, the entire screen is divided into a plurality of blocks, and a plurality of common electrodes and a plurality of segment electrodes are arranged so as to intersect each other for each block. pixels respectively formed at the intersection, by driving the pixel for each block, a liquid crystal display panel which enables a liquid crystal display of the entire screen comprising a plurality of pixels arranged in a matrix form, each If a wiring for supplying a data signal to the segment electrode in the block is drawn out in a direction parallel to the segment electrode, and there is another block in the drawn-out direction, it is parallel to the segment electrode in the other block. It is characterized in that it passes through the common electrode .
The invention according to claim 2 is characterized in that a width of a portion of the common electrode that intersects the wiring of the segment electrode is narrow.
The invention described in claim 3 is characterized in that the electrode width of the non-pixel portion of the common electrode and the line width of the wiring of the segment electrode are each 100 microns or less.
The invention described in claim 4 is further characterized in that metal plating is applied to the wiring of the segment electrode.
The invention described in claim 5 is characterized in that a black matrix which is blinded is formed in a portion of the panel which is not a pixel.
[0009]
Therefore, according to the first aspect of the present invention, the liquid crystal display panel is divided into a plurality of blocks, a plurality of common electrodes are provided in each block, and a plurality of segment electrodes are provided in a direction intersecting with the common electrodes. Since the wiring for supplying the data signal to the segment electrode is arranged so as to be parallel to the segment electrode, it is not necessary to pass the wiring for supplying the data signal to the segment electrode between each block. Since there is no need to widen the pixel interval and there is no need to reduce the aperture area of the pixel, a liquid crystal display panel with a good display balance can be provided.
[0010]
The segment electrode wiring crosses the common electrode is not a pixel, but can be turned on when a voltage is applied between the wiring and the electrode (hereinafter this portion is referred to as a wiring lighting section). However, according to the second and third aspects of the present invention, even if the area of the wiring lighting part is 100 microns × 100 microns or less, the lighting of the wiring lighting part is made inconspicuous.
[0011]
Furthermore, according to the invention of claim 4, for example, metal plating is performed on the wiring so that the line resistance of the wiring does not increase. Further, according to the fifth aspect of the present invention, the black matrix which is blinded is formed in the portion other than the pixels of the display panel, and unnecessary wiring lighting portions are covered with the black matrix, so that the contrast of the pixels is increased and the display quality is improved. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a liquid crystal display panel of the present invention will be described in detail with reference to the drawings. FIG. 1 and FIG. 2 are diagrams for explaining a liquid crystal display panel driven by a dynamic method used in the display device as described above and a driving method thereof. This figure shows the entire liquid crystal display panel. The entire panel is divided into block A and block B.
[0013]
In the block A, two common electrodes 71, 72 are provided in the horizontal direction, and four segment electrodes 75, 76, 77, 78 are provided in the vertical direction. Eight pixels are formed at the intersections of the common electrodes 71 and 72 and the segment electrodes 75, 76, 77, and 78, respectively. As shown in FIG. 2, the common electrodes 71 and 72 are provided with wirings 71a and 72a for applying a scanning signal of the block A, and the segment electrodes 75, 76, 77, and 78 are provided with wirings 75a for applying a data signal. 76a, 77a, 78a are provided.
[0014]
In the block B, two common electrodes 73, 74 are provided in the horizontal direction, and four segment electrodes 79, 80, 81, 82 are provided in the vertical direction. Eight pixels are formed at the intersections of the common electrodes 73 and 74 and the segment electrodes 79, 80, 81, and 82, respectively. The common electrodes 73 and 74 are provided with wirings 73a and 74a for applying a block B scanning signal, and the segment electrodes 79, 80, 81 and 82 are provided with wirings 79a, 80a and 81a for applying a block B data signal. , 82a are provided.
[0015]
In the liquid crystal display panel configured as described above, a scanning signal is sequentially applied to the common electrode of each block via each wiring, and each segment electrode that intersects with the common electrode is also connected to each block via each wiring. By appropriately applying data signals, liquid crystal display of the entire screen becomes possible. For example, as shown in FIG. 2, a scanning signal is applied to the common electrode 73 of the block B via the wiring 73a, and the segment electrodes 79, 80, 81, 82 are appropriately connected to the common electrodes 73 via the wirings 79a, 80a, 81a, 82a, respectively. By selectively applying the data signal, only a desired pixel can be turned on from the four pixels positioned on the common electrode 73. Subsequently, a scanning signal is applied to the adjacent common electrode 74 via the wiring 74a, and a data signal is selectively selectively applied to the segment electrodes 79, 80, 81 and 82 via the wiring 79a, 80a, 81a and 82a, respectively. By applying the voltage, only a desired pixel among the four pixels positioned on the common electrode 74 can be turned on. In this way, the duty ratio, which is the time ratio of voltage application to each segment electrode, can be lowered by the number of blocks, and as a result, advantages such as improved viewing angle and faster response can be obtained. .
[0016]
In addition, since the segment electrode wiring of the liquid crystal display panel is devised to be parallel to the segment electrode as described above, the segment electrode wiring 79a, 80a, 81a, and 82a must be passed between the block A and the block B. However, it is sufficient that there is room for passing only one wire between the segment electrodes of the block A. For this reason, since it is not necessary to widen the space | interval of each block (for example, block A, B), the display balance over the whole display image is not reduced, and display quality does not deteriorate. Accordingly, since it is not necessary to reduce the size of the pixels as in the conventional multiplexing liquid crystal display panel, a dynamic liquid crystal display panel with a good resolution without decreasing the aperture ratio is obtained.
[0017]
Note that lighting / non-lighting control of each pixel can be appropriately performed by a known method. For example, in FIG. 2, one pixel (0, 0) is transparent (lighted state) only when a predetermined voltage is applied between the common electrode 71 and the segment electrode 75, and when a predetermined voltage is not applied. It becomes opaque (non-lighting state). The same control is performed for other pixels, so that lighting / non-lighting of all the pixels is appropriately controlled. The present invention may be a transmissive type having a light source disposed behind the liquid crystal panel, or a reflective type utilizing reflection of light from the outside.
[0018]
FIG. 3 is a partial enlarged view of part A including the four pixels shown in FIG. 1. The hatched portion indicates a segment electrode, and the common electrode is arranged so as to intersect the segment electrode via liquid crystal. Has been.
[0019]
As shown in the figure, the width A 1 of the pixel portion where the common electrode 72 and the segment electrode 78 intersect is formed in the same manner as the width of the common electrode 72. On the other hand, the width W2 of the common electrode 72 where the common electrode 72 and the segment electrode 78 do not intersect with each other is not much smaller than the width A1. This is because, for example, when a scanning signal is applied to the common electrode 72 and a data signal is applied to the segment electrode 82 via the wiring 82a, the common electrode 72 and the segment electrode that crosses the common electrode 72 are considered. A predetermined voltage is also applied to a portion A2 where the wiring 82a for 82 crosses, and this causes the portion A2 to be lit even though it is not a pixel (hereinafter, this portion is referred to as a wiring lighting portion). In this way, the part that is not a pixel is lit, because the display quality is deteriorated. Therefore, the line width W2 of the wiring lighting part A2 is made as narrow as possible so that the lighting of the wiring lighting part A2 becomes inconspicuous.
[0020]
The size (area) of the wiring lighting portion A2 is determined by the line width W1 of the segment electrode wiring 82a and the width W2 of the non-pixel portion of the common electrode 72. The smaller the line width W1 of the segment electrode and the width W2 of the electrode that is not the pixel of the common electrode, the smaller the wiring lighting portion A2 becomes, and lighting becomes inconspicuous. Therefore, in the present invention, the line width W1 is set to 100 microns or less. Alternatively, both the line widths W1 and W2 are set to 100 microns or less, thereby reducing the area of the wiring lighting portion A2 to 100 microns × 100 microns or less so that the lighting of the wiring lighting portion A2 is further unnoticeable. On the other hand, when the line resistance of the wiring 82a is increased because the line width of the wiring 82a is extremely narrowed so that the lighting of the wiring lighting part A2 is not conspicuous, metal plating is applied over the entire area of the surface of the wiring 82a. Thereby, the line resistance may be lowered.
[0021]
As shown in FIG. 4, the metal chromium 37 can be formed by vacuum deposition or the like on the non-pixel portion between the segment electrodes 77 and 78 on the glass substrate 33. However, since both the wiring 82a and the metallic chromium 37 are good electrical conductors, if the metallic chromium 37 is simply vacuum-deposited on the wiring 82a, both are short-circuited. The metal chromium 37 needs to be vacuum-deposited on the material 29 to electrically insulate the wiring 82a from the metal chromium 37, and the boundary between the segment electrode and the metal chromium 37 is masked during the vacuum deposition. Therefore, it is necessary to electrically insulate the segment electrodes 77 and 78 through the metal chrome 37.
[0022]
Alternatively, as shown in FIG. 5, a non-pixel portion between the segment electrodes 77 and 78 on the glass substrate 33 is provided in a black resin material made of a modified epoxy resin and a dye or a normal color filter, and a gap between the pixel electrodes is provided. The black seal material 37a and the like used for light shielding can also be formed by a screen printing method. In this way, the black matrix 60 may be formed in a portion that is not a pixel as shown in FIG. 6 with the metal chrome 37, the black resin material, the black seal material 37a, or the like, thereby concealing the lighting of the wiring lighting portion. When the black matrix as shown in FIGS. 4 and 5 is employed, it is not necessary to reduce the width of the common electrode or wiring, and as a result, it is not necessary to reduce the line resistance of the common electrode or wiring.
[0023]
【The invention's effect】
As described above, according to the liquid crystal display panel according to the present invention, the number of wirings of the entire display screen is kept the same by devising the wiring of the segment electrodes so as to be parallel to the segment electrodes. It is possible to provide a liquid crystal display panel with good contrast and excellent display balance without reducing the number of wirings between pixels to the necessary minimum, thereby reducing the aperture ratio of the pixels. In addition, the wiring width of the wiring lighting section is set to 100 microns or less to make the lighting of the wiring lighting section inconspicuous, or a black matrix is formed in the wiring lighting section to conceal the wiring lighting section so that the display quality is further improved. Panels can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a liquid crystal display panel according to the present invention.
FIG. 2 is an explanatory diagram of a driving method of a liquid crystal display panel according to the present invention.
3 is an enlarged plan view of a part A of the liquid crystal display panel shown in FIG. 1. FIG.
FIG. 4 is a partially enlarged sectional view of a liquid crystal display panel according to the present invention.
FIG. 5 is a partially enlarged sectional view of another embodiment of the liquid crystal display panel according to the present invention.
FIG. 6 is a plan view of a liquid crystal display panel on which a black matrix is formed according to the present invention.
FIG. 7 is a plan view for explaining a wiring method of a liquid crystal display panel according to a conventional dynamic method.
FIG. 8 is a diagram for explaining a driving method of a liquid crystal display panel according to a conventional dynamic method.
[Explanation of symbols]
71 Block A Common Electrode 72 Block A Common Electrode 73 Block B Common Electrode 74 Block B Common Electrode 71a Block A Common Electrode Wiring 72a Block A Common Electrode Wiring 73a Block B Common Electrode Wiring 74a Block B common electrode wiring 75 block A segment electrode 76 block A segment electrode 77 block A segment electrode 78 block A segment electrode 79 block B segment electrode 80 block B segment electrode 81 block B segment electrode 82 block B segment electrode 75a Block A segment electrode wiring 76a Block A segment electrode wiring 77a Block A segment electrode wiring 78a Block A segment electrode wiring 79a Block B segment B wiring Instruments electrode wiring 80a block B for the segment electrode wiring 81a block B for the segment electrode wiring 82a block B for the segment electrode wiring

Claims (8)

The entire screen is divided into a plurality of blocks, and a plurality of common electrodes and a plurality of segment electrodes are arranged so as to intersect each other for each block. A liquid crystal display panel that enables liquid crystal display of the entire screen composed of a large number of pixels arranged in a matrix by being driven every time, and a wiring for supplying a data signal to a segment electrode in each block It is drawn out in a direction parallel to the electrode, and when another block exists in the drawn-out direction, it is parallel to the segment electrode in the other block and passes while crossing the common electrode. LCD panel to be used.   2. The liquid crystal display panel according to claim 1, wherein a width of a portion of the common electrode that intersects with the wiring of the segment electrode is narrow.   3. The liquid crystal display panel according to claim 1, wherein an electrode width of the portion of the common electrode that is not a pixel and a line width of the wiring of the segment electrode are each 100 μm or less.   The liquid crystal display panel according to claim 1, wherein metal wiring is applied to the wiring of the segment electrode.   The liquid crystal display panel according to claim 1, wherein a black matrix that is blinded is formed in a portion of the panel that is not a pixel.   6. The liquid crystal display panel according to claim 5, wherein the black matrix is formed by a vapor deposition method using metallic chromium.   6. The liquid crystal display panel according to claim 5, wherein the black matrix is formed by a screen printing method using a black resin material.   6. The liquid crystal display panel according to claim 5, wherein the black matrix is formed by a screen printing method using a black sealing material.

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