JPH0521058Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a matrix type color liquid crystal display element.

[Conventional technology]

2. Description of the Related Art Hitherto, matrix type color liquid crystal display elements for displaying full-color images such as television images have been known to have electrode patterns as shown in FIGS. 3 and 4.

The color liquid crystal display element shown in Fig. 3 is of the so-called stripe electrode type, and in the figure C1, C2...
... is a large number of horizontal striped common electrodes (also called scanning electrodes) formed on one side of a pair of transparent substrates facing each other with a liquid crystal layer in between, R1, G2, B3.
. . . are a large number of vertical striped segment electrodes (also referred to as signal electrodes) arranged on the other substrate so as to cross and oppose the common electrodes C1, C2 . . . The first, fourth, . Electrodes R1, R4... are segment electrodes for red pixel display with a red filter formed on their surfaces;
Segment electrodes G2, G5... of the main, fifth...
... are segment electrodes for green pixel display with a green filter formed on their surfaces, and the third and sixth electrodes...
The segment electrodes B3, B6, . . . are blue pixel display segment electrodes having a blue filter formed on their surfaces. In addition, in the figure, X1, X2...
are the terminals of each common electrode C1, C2..., Y1, Y
2, Y3... are each segment electrode R1, G2, B
3... is the terminal. This color liquid crystal display element performs a display operation by sequentially driving common electrodes C1, C2... and selectively driving each segment electrode R1, G2, B3... in synchronization with the driving of the common electrodes. Segment electrode R1,R
4... and the common electrodes C1, C2..., the red pixel displayed at the cross-opposed portion, and the segment electrode G.
2, G5... and the common electrodes C1, C2... are displayed in the cross-opposed portion, and segment electrodes B3, B6... and the common electrodes C1, C2... are displayed in the cross-opposed portion. Full-color display is achieved by combining three pixels each with a blue pixel.

Furthermore, the color liquid crystal display element shown in FIG.
This is called a dot electrode type, and R1 and R4 in the figure
... is a red pixel display segment electrode with a red filter formed on its surface, G2, G5... is a segment electrode for green pixel display with a green filter formed on its surface, B3, B6 ... is a segment electrode with a blue filter formed on its surface. These are segment electrodes for blue pixel display, and each of these segment electrodes is a common electrode C1, C2.
The width along the width direction of ... is approximately 1/2 of the common electrode width
It is said to be a horizontally long rectangular dot-shaped electrode. Each of these segment electrodes is connected to each common electrode C.
The common electrodes C1, C2... are arranged alternately in two rows with the segment electrodes in one row and the segment electrodes in the other row shifted by 1/2 pitch from each other, and the common electrodes C1, C2... The display segment electrodes of pixels of the same color in each column arranged in the intersecting direction (vertical direction) are connected to each other by signal lines a and a wired between the segment electrodes displaying pixels of other colors. Terminal Y
1, Y2, Y3... That is, in this color liquid crystal display element, segment electrodes R1, G2, B3, etc., which display pixels of each color, are dot-shaped electrodes, and each segment electrode is shifted by 1/2 and arranged so as to overlap each other in the vertical direction. This color liquid crystal display element is also driven in the same way as the color liquid crystal display element shown in FIG.
A full-color image is displayed by a combination of three green and three blue pixels.

[Problem that the invention attempts to solve]

However, the striped electrode type color liquid crystal display element having the electrode pattern shown in FIG.
1, R4... and segment electrode G for green pixel display
2, G5... and segment electrode B for blue pixel display
3, B6... are arranged alternately, so red, green, and blue display pixels are displayed alternately in the horizontal direction, but pixels of the same color are displayed in a straight line in the vertical direction. This not only causes poor color mixing, but also causes red, green, and blue stripes to appear on the screen, and because each color display pixel is a large-area pixel with the same vertical width as the common electrode width. 1 1
Since one pixel is conspicuous, the stripe electrode type color liquid crystal display device has a problem of poor image quality.

On the other hand, the dot electrode type color liquid crystal display element with the electrode pattern shown in FIG. 4 has segment electrodes R1, R4..., G2, G5... for displaying pixels of each color.
..., B3, B6..., each common electrode C1, C2
Because the segment electrodes in one row and the segment electrodes in the other row are arranged in two rows with a 1/2 pitch offset from each other, color mixing can be improved to some extent. In addition, since pixels of the same color arranged vertically are displayed at intervals of approximately 1/2 the width of the common electrode, the striped pattern in which pixels of the same color arranged vertically appear consecutive is also striped. It is much less noticeable than the electrode type. However, even in this dot electrode type color liquid crystal display element, each segment electrode R1, G
The vertical width of 2, B3... is narrow, approximately half the common electrode width, but the horizontal width is approximately twice the segment electrode width of a striped electrode type color liquid crystal display element (depending on the screen size and the number of segment electrode rows). (if they are the same), the display pixels of each color are shaped like the display pixels of a striped electrode type color liquid crystal display element laid down horizontally, and therefore 1
The problem was that each pixel stood out and the displayed image became rough. Note that also in the conventional dot electrode type color liquid crystal display element described above, the number of rows of segment electrodes is increased so that each segment electrode R1, G
By reducing the width of 2, B3..., each display pixel can be made smaller to make it less noticeable and the image quality can be improved. However, in the conventional dot electrode type color liquid crystal display element, each segment electrode R1, G2 , B3...
... is driven individually for each column, so increasing the number of segment electrode columns in order to reduce the width of each segment electrode R1, G2, B3... would result in a large segment driver circuit. Not only will the scale increase, but the sampling frequency of the video signal will also have to be increased (increasing the sampling frequency requires the circuit to be constructed with expensive, high-performance elements, and also increases power consumption). There was a problem.

This idea was devised in view of the above-mentioned circumstances, and its purpose is to use pixels of the same color that are lined up in a direction that intersects the common electrode, similar to the conventional dot electrode type color liquid crystal display element. This technology makes the continuous striped pattern less noticeable, and increases the number of segment electrode rows without increasing the size of the segment driver circuit or the sampling frequency, thereby reducing the size of display pixels and increasing their density. To provide a matrix type color liquid crystal display element capable of improving the mixing of colors of each pixel and improving image quality by making each display pixel less noticeable than an electrode type color liquid crystal display element.

[Means to solve problems]

This invention consists of display segment electrodes for pixels of a first color among the three primary colors of red, green, and blue, a display segment electrode for pixels of a second color, and a display segment electrode for pixels of a third color. are dot-shaped electrodes whose width along the width direction of the common electrode is approximately 1/2 of the width of the common electrode, and these segment electrodes are arranged in two rows for each common electrode, and the segment electrodes in one row and The segment electrodes in the other row are arranged so as to be shifted by 1/2 pitch from each other, and among the rows of segment electrodes arranged in the direction intersecting the common electrode, display segment electrode rows for pixels of other colors are sandwiched between the rows of segment electrodes. The display segment electrode rows of adjacent pixels of the same color are each set as one set, and each segment electrode of one segment electrode row of each set and each segment electrode of the other segment electrode row is connected between the two segment electrode rows. This is characterized in that the segment electrodes of the segment electrode array are alternately connected by signal lines that are wired diagonally through the gaps between the segment electrodes.

[Effect]

In other words, the color liquid crystal display element of this invention is
By arranging the segment electrodes that display pixels of each color in two rows for each common electrode, and shifting the segment electrodes in one row and the segment electrodes in the other row by 1/2 pitch, it is possible to Similar to electrode-type color liquid crystal display elements, this reduces the conspicuousness of the striped pattern in which pixels of the same color are lined up in a direction that intersects the common electrode. , the display segment electrode rows of adjacent pixels of the same color across the display segment electrode rows of pixels of other colors are each set as one set, and each segment electrode of one segment electrode row of each set and the other segment By alternately connecting each segment electrode of the electrode row with signal lines wired diagonally between the segment electrodes of the segment electrode row between both segment electrode rows, the display segment electrodes of pixels of the same color can be connected to two segment electrodes of the same color pixel. In this way, if the display segment electrodes of pixels of the same color are driven together for two columns, the number of segment electrode columns that can be driven using the same size segment driver circuit and the same sampling frequency can be increased. Since the width of each segment electrode can be approximately doubled, the width of each segment electrode can also be approximately halved. Therefore, according to the color liquid crystal display device of this invention, the number of segment electrode rows can be increased without increasing the scale of the segment driver circuit or the sampling frequency, thereby reducing the size of display pixels and increasing their density. Therefore, it is possible to improve the color mixing of each pixel more than in the conventional dot electrode type color liquid crystal display element, and also to make each display pixel inconspicuous, thereby improving the image quality.

〔Example〕

An embodiment of this invention will be described below with reference to FIG.

In Fig. 1, C1, C2...Cn in the figure are multiple common electrodes in the form of horizontal stripes, X1,
2...Xn is its terminal. Also, R1, R4
..., G2, G4..., B3, B6... are segment electrodes facing the common electrodes C1, C2...Cn, respectively, and R1, R4... are red, green,
The segment electrodes are used to display pixels of the first color (red pixels in this embodiment) among the three primary colors of blue, and G2, G4, etc. are used to display pixels of the second color (green pixels in this embodiment). B3, B6, . . . are segment electrodes for displaying pixels of a third color (blue pixels in this embodiment). These red pixel display segment electrodes R1, R4..., green pixel display segment electrodes G2, G4..., blue pixel display segment electrodes B3, B6... are transparent electrodes with red, green, and blue colors on the surface. Each of these segment electrodes R1, G2, B3...
... has a vertical and horizontal dimension ratio in which the width along the width direction of common electrodes C1, C2...Cn is approximately 1/2 of the common electrode width, and the width along the length direction of the common electrode is also approximately 1/2 of the common electrode width. It is a square dot-shaped electrode with a ratio of approximately 1:1. Each of these segment electrodes R1, G2, B3... is connected to each common electrode C1, C
2...They are alternately arranged in two rows with respect to Cn, with the segment electrodes in one row and the segment electrodes in the other row being shifted by 1/2 pitch from each other. Each segment electrode R1, G2, B3... has one display segment electrode for pixels of the same color in the vertical direction (direction orthogonal to the common electrodes C1, C2...Cn).
They are arranged in rows, and furthermore, among each segment electrode row, the display segment electrode rows of pixels of the same color that are adjacent to each other across the display segment electrode row of pixels of other colors, that is, the G2 row and the G2 row Columns, B3 column and B3 column, R4 column and R4 column, etc. are each set as two columns each, and each segment electrode of one segment electrode column and the other segment electrode column of each group are set. Each segment electrode is connected alternately (in a zigzag manner) by signal lines a and a diagonally routed through each segment electrode line of the segment electrode line between these two segment electrode lines.
connected to the top row segment electrodes G2, B
3, R4, . . . are connected to segment electrode terminals Y2, Y3, Y4, . . . arranged on the upper edge side of the element. Note that among the rows of segment electrodes R1 and R4 for red pixel display, there is only one first row (R1 row), so each segment electrode R1, R1, . The segment electrode R in the top row is connected by the signal line a that detours around the outside of the display segment electrodes G2, G2...
1 to the segment electrode terminal Y1.

This color liquid crystal display element has a common electrode C1,
C2...Cn is sequentially driven, and each segment electrode terminal Y1, Y is synchronized with the drive of this common electrode.
A full color image is displayed by selectively applying a drive signal to segment electrode terminals Y1, Y4...
Segment electrodes R1, G2, G2, B3, B driven by application of drive signals to 2, Y3, Y4
3, R4 (those in the upper and lower rows in the figure), segment electrodes R4 (those in the upper row in the figure) driven by application of drive signals to segment electrode terminals Y4, Y5, Y6, and Y7, G5, G5, and B6 , B6, R7 (upper and lower rows in the figure)... are displayed by six segment electrodes. Note that since the segment electrodes R4, R7, etc. for displaying red pixels excluding R1 are present in both of the six adjacent segment electrode groups, the segment electrodes R for displaying red pixels in one group
4, R7..., the adjacent group of red pixel display segment electrodes R4, R7... are also driven together and a red pixel is displayed in this part, but in this color liquid crystal display element, each segment Since the vertical and horizontal widths of the electrodes R1, G2, B3, R4, . . . are approximately half the width of the common electrode, the red pixels displayed in adjacent groups are very small and hardly noticeable.

Therefore, in the above color liquid crystal display element, the segment electrodes R1, R4...
...and green pixel display segment electrodes G1, G5
...and blue pixel display segment electrodes B3, B
6... are square dot-shaped electrodes whose vertical and horizontal widths are approximately 1/2 of the common electrode width, and each of these segment electrodes R1, G2, B3... is 2 for each common electrode. Since the segment electrodes in one row and the segment electrodes in the other row are arranged in rows with a 1/2 pitch shift from each other, the electrodes are arranged in a direction that intersects the common electrode, similar to the conventional dot electrode type color liquid crystal display element. It is possible to make a striped pattern in which consecutive pixels of the same color lined up appear less noticeable. Moreover, in the above color liquid crystal display element, among the rows of segment electrodes arranged in the direction intersecting the common electrode, the display segment electrode rows of pixels of the same color are adjacent to each other across the display segment electrode rows of pixels of other colors. Each segment electrode of one segment electrode row and each segment electrode of the other segment electrode row of each set are passed through between each segment electrode of the segment electrode row between both segment electrode rows. Since the display segment electrodes of pixels of the same color are driven together for two columns by alternately connecting them with signal lines a, a, etc. wired diagonally, segment driver circuits of the same size and Since the number of segment electrode rows that can be driven at the same sampling frequency can be approximately doubled, the width of each segment electrode R1, G2, B3, . . . can also be approximately halved. Therefore, according to the color liquid crystal display device of this invention, the number of segment electrode rows can be increased without increasing the scale of the segment driver circuit or the sampling frequency, thereby reducing the size of display pixels and increasing their density. Therefore, the colors of each pixel can be mixed better than the conventional dot electrode type color liquid crystal display element, and the image quality can be improved by making each display pixel less noticeable.

In addition, in the above embodiment, the segment electrode terminal Y
1, Y2, Y3, Y4... are all arranged on the upper edge side of the element, and these segment electrode terminals Y1,
Y2, Y3, Y4... may be arranged alternately on the upper edge side and the lower edge side of the element as shown in FIG. Further, in the above embodiment, the first color pixel is red, the second color pixel is green, and the third color pixel is blue. The combinations are not limited to the above embodiments. Also,
The horizontal width of each segment electrode R1, G2, B3... is determined according to the screen size and the number of pixels in the horizontal direction, that is, the number of segment electrode rows. Segment electrode R
1, G2, B3... may not be able to be made approximately 1:1 as in the above embodiment, but even in that case, the shape of the display pixel will only change slightly, and each The effects of improving the mixing of pixel colors and making each pixel less noticeable are still maintained. Further, in the above embodiment, each segment electrode R1, G2, B3... has a color filter formed on its surface, but the above-mentioned filter may be formed under the segment electrode, or A color filter may be formed on the common electrode side or on the outer surface of the element so as to correspond to each segment electrode.

[Effect of idea]

The color liquid crystal display element of this invention has a segment electrode for displaying a pixel of a first color among the three primary colors of red, green, and blue, a segment electrode for displaying a pixel of a second color, and a segment electrode for displaying a pixel of a third color. The display segment electrodes are dot-shaped electrodes whose width along the width direction of the common electrode is approximately 1/2 of the width of the common electrode, and these segment electrodes are arranged in two rows for each common electrode and on one side. The segment electrodes in one row and the segment electrodes in the other row are arranged with a 1/2 pitch offset from each other, and among the rows of segment electrodes arranged in the direction that intersects the common electrode, display segment electrodes for pixels of other colors are arranged. The display segment electrode rows of adjacent pixels of the same color across the rows are each set as one set, and each segment electrode of one segment electrode row and each segment electrode of the other segment electrode row of each set are Since the signal lines are connected alternately by diagonally routed signal lines between the segment electrodes of the segment electrode arrays, similar to the conventional dot electrode type color liquid crystal display element, the signal lines intersect with the common electrode. It is possible to make the striped pattern in which pixels of the same color appear consecutively lined up in a row become less noticeable, and it is also possible to increase the number of segment electrode rows without increasing the scale of the segment driver circuit or the sampling frequency. Because it can be made smaller and more densely packed, the colors of each pixel are better mixed than conventional dot electrode type color liquid crystal display elements, and each display pixel is also less noticeable, improving image quality. can be done.

[Brief explanation of drawings]

Figure 1 is an electrode pattern diagram of a color liquid crystal display element showing one embodiment of this invention, Figure 2 is an electrode pattern diagram of a color liquid crystal display element showing another embodiment of this invention, and Figures 3 and 4. are electrode pattern diagrams of conventional color liquid crystal display elements. R1, R4, R7... Segment electrode for red pixel display, G2, G5, G8... Segment electrode for green pixel display, B1, B6... Segment electrode for blue pixel display, a... Signal line, C1 to Cn... ...Common electrode.

Claims (1)

[Scope of utility model registration request] In a matrix type color liquid crystal display element, a segment electrode for displaying a pixel of a first color among the three primary colors red, green, and blue, a segment electrode for displaying a pixel of a second color, and a segment electrode for displaying a pixel of a third color. The display segment electrode is a dot-shaped electrode whose width along the width direction of the common electrode is approximately 1/2 of the width of the common electrode,
These segment electrodes are arranged in two rows for each common electrode, with the segment electrodes in one row and the segment electrodes in the other row being shifted by 1/2 pitch from each other, and in the direction crossing the common electrodes. Among the rows of segment electrodes lined up, the display segment electrode rows of pixels of the same color that are adjacent to each other across the display segment electrode rows of pixels of other colors are regarded as one set, and one segment electrode row of each set is Each segment electrode of the other segment electrode row and each segment electrode of the other segment electrode row are alternately connected by signal lines wired diagonally between the segment electrodes of the segment electrode row between the two segment electrode rows. Color liquid crystal display element.