JPH08932U - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Structure] A display pixel row that extends in the horizontal direction like the display pixels F ₁₁ and F ₁₃ has a pitch that is 1/2 the vertical pitch of the display pixel with respect to the adjacent display pixel row. It is arranged. In order to realize such a pixel arrangement, the data electrodes DD ₁ and DD _1
The pixel ₂ has a shape in which the center is wide and both ends are narrow, and the pixel portions are arranged so as to be vertically displaced from the adjacent data electrode by 1/2 pitch.
The scanning electrode is a common electrode for two adjacent pixel rows extending in the horizontal direction. [Effect] The vertical fineness of the display screen is apparently improved. In addition, the data electrode having the above-described shape is easily etched.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a liquid crystal display device driven in a time division manner.

[0002]

[Prior art]

 Conventionally, it has been difficult to satisfy both the fineness of the screen and the high contrast in a liquid crystal television image receiving device that displays a television image by arranging pixels that are driven in a time division manner in a matrix. In particular, in order to increase the vertical pixel density of a television, an expensive memory IC was required, and a complicated and expensive manufacturing method had to be adopted, which was not realistic.

It has been found that improving the pixel density in the vertical direction is effective in improving the image quality of a liquid crystal television. One solution in passive liquid crystal displays is the multiplex matrix. However, unlike office displays, TVs require fast response to display moving images, and the grid-arranged pixels necessary to display characters neatly are not always necessary.

[0004]

[Problems to be solved by the device]

 In consideration of the characteristics of the liquid crystal television as described above, the present invention increases the number of pixel rows in the vertical direction without increasing the number of time divisions of the liquid crystal display element, and moreover, provides a fine pattern as required by a multiple matrix. The purpose is to realize a structure that is not used.

[0005]

[Means for Solving the Problems]

 To achieve the above object, one configuration of the liquid crystal display device of the present invention is as follows. That is, a first transparent insulating substrate having a plurality of first transparent electrodes formed on its surface, and a second transparent insulating substrate having a plurality of second transparent electrodes arranged facing the substrate are formed on the surface. An insulating substrate is provided, a liquid crystal substance is sandwiched between the first and second transparent insulating substrates, and a timing signal voltage, which is a periodic function of time, is applied to the first transparent electrode to apply the second transparent electrode. In a liquid crystal display device of a matrix pixel array in which a data signal voltage, which is a function of time and display information, is applied to the electrodes and driven in a time division manner, the second transparent electrode has a wide center width, It has a shape in which a plurality of unit electrodes having a narrow width and a fixed length are connected in the length direction, and the second transparent electrode adjacent to each other is equal to one half of the unit electrode in the length direction. The first transparent electrodes are arranged so as to be offset from each other, and each of the first transparent electrodes has a predetermined second transparent electrode. The display pixel is located at the electrode and has a shape facing the unit electrode that is displaced from each other by at most half the length of the unit electrode, and the facing portion between the first transparent electrode and the unit electrode is a display pixel. It is a liquid crystal display device.

In addition, a liquid crystal display device having another structure of the present invention has the electrode structure as described above, and faces the transparent electrode when the odd first transparent electrode is selected. A data signal voltage is applied to the second transparent electrode having a unit electrode, the voltage between the other second transparent electrode and the even-numbered first transparent electrode is set to zero, and the even-numbered first transparent electrode is set. When the electrode is selected, the data signal voltage is applied to the second transparent electrode having the unit electrode facing the transparent electrode, and the other second transparent electrode and the odd-numbered first transparent electrode The liquid crystal display device is driven by setting the voltage between them to zero.

[0007]

【Example】

 In the present invention, the pixel density is changed without increasing the number of lines of the timing electrode, which has conventionally determined the pixel density in the vertical direction, and the display information corresponding to the deformed pixel position is sent to the pixel. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 102 is a timing substrate on which timing electrodes are formed, and 104 is a data substrate of data electrodes. The electrode is a transparent electrode using tin oxide or indium oxide, and the substrate is a transparent insulating substrate such as glass. Reference numeral 110 denotes a timing drive circuit, which outputs a drive signal having a waveform determined by a function of time. A data drive circuit 112 outputs a drive signal defined by display information and time. The timing substrate 102 and the data substrate 104 are arranged so that their electrode forming surfaces face each other and face each other up to a gap of several micron, and a liquid crystal substance is sandwiched between them to be used as a liquid crystal panel.

The shape of the timing electrodes Y _{1 to} Y _{7 is} a shape in which strip electrodes are vertically shaken at regular intervals as a function of the position in the lateral direction. Data electrodes X ₁ is combined timing electrode and set to X ₅ is a simple shape of the single wire. A portion sandwiched between both electrodes becomes a display pixel, and G _{11 to} G _{84 in} FIG. 1 respectively configure a pixel portion. The biggest difference between the state where the timing electrode in FIG. 1 is straightened and the pixel array G _{11 to} G _{84 in} the figure is the arrangement of the center of gravity of the pixel. In FIG. 1, the Y coordinate of the center of gravity of the pixel G ₂₂ is located at the average position of the Y coordinates of both G ₁₁ and G ₃₁ pixels. Therefore, the pixels on the data lines X ₂ and X ₄ and the pixels on the data lines X ₁ , X ₃ , and X ₅ are arranged so that the Y coordinate is shifted by a half pitch. The number of is equal to doubled, and the vertical fineness can be improved.

The first horizontal scanning line of a television can be displayed by G ₁₁ , G ₁₃ , and G ₁₅ of pixels, and the second horizontal scanning line can be displayed by G ₂₂ , G ₂₄ ,. Here, since the G ₁₁ and G ₂₂ pixels are on the same timing signal Y ₁ , the time when the transmitted display information is received is different between G ₁₁ and G ₂₂ , and the timing for driving the liquid crystal pixel is different. The memory circuit element retains information for the time difference. The advantage of the electrode shape in FIG. 1 is that the shape of the data driving electrode is simple and easy to make, and the timing electrode may be a thick electrode wire.

In FIG. 2, the idea of modulating the width and position of the timing electrode as a periodic function of location in FIG. 1 is applied as it is, and the width of the data electrode is also periodically modulated as a function of location. Thus, the smoothness of the image improves as the pixel shape approaches a circle. Further, the angle of the concave portion of the electrode is as wide as 135 ° or more with respect to the data electrode, and the concave portion of the wide portion of the timing electrode is 90 °, which is advantageous in processing during etching. However, since the data electrode is partially narrowed, the probability of disconnection at the time of electrode formation may be slightly increased.

FIG. 7 is a view in which the timing electrodes are also partially narrowed down, and the electrode shape and arrangement are convenient when the drive with pause is alternately performed in the even frame and the odd frame of the television. In FIG. 2, 210 is a data electrode substrate, 220 is a timing electrode substrate, 222 and 223 are timing electrodes, and 211, 212 and 213 are data electrodes. With the electrode configuration of FIG. 2, the impression of the connection between the horizontal rows of pixels as seen by the human eye is better than that of FIG. The connection feeling of the pixels of F ₁₁ , F ₁₃ , and F _{15 in} FIG. 2 is better than the connection feeling of G ₁₁ , G ₁₃ , and G ₁₅ .

FIG. 3 shows that by combining the electrode configuration shown in FIG. 1 and the color arrangement of color filters, a passive color liquid crystal display with excellent productivity can be constructed. The concept of the electrode structure is the same as in Fig. 1, and one color is associated with each data electrode line corresponding to the strip-shaped data electrode. Since strip-shaped color filters can be used, it is advantageous in terms of production cost. Is. Further, the pixel drive voltage can be adjusted depending on the color.

In FIG. 3, 330 is a timing board, 340 is a data board, 310 is a timing driver, 322 is a first data driver, 340 is a second data driver, and 351, 352, 355, 356 are the second data driver. Data electrodes 353 and 354 driven by the first driver are data electrodes formed with green and blue color filters driven by the first driver. In FIG. 3, a red filter is additionally formed on the data electrodes 351 and 355, and a green filter is additionally formed on 352 and 356. The electrode 353 is additionally formed with a blue color, and the electrode 353 is additionally formed with a green color filter.

When the driving voltages of the data driver 322 and the data driver 320 can be adjusted to different values, the red and green pixel groups controlled by the first data driver of the screen and the second data driver are driven. Fine integration of the voltage-light characteristics of the blue and green pixel groups of the second data control is possible. Adjusting red and blue will match green to its average property by the integral averaging action of the human eye. Regarding the green pixel group, the pixels driven by the first data driver and the pixels driven by the second data driver are mixed.

In the high-density mounting liquid crystal panel in which the driving IC is directly connected to the liquid crystal panel, the characteristic of the color pixel is adjusted in the unit of IC as in this method, or a plurality of pixels are provided in the same IC chip. Realization is difficult without using a complicated IC with the power supply line. In that respect, the structure of Fig. 3 is effective. Of course, it is possible to adopt the electrode shape shown in FIG.

FIG. 6 shows a structure in which the timing electrode and the data electrode of the electrode structure of FIG. 2 are replaced, and can be used for interlaced driving. In FIG. 6, 620 is a timing substrate, 610 is a data substrate, 631 to 635 are timing electrodes, and 641 and 642 are data electrodes. The electrodes at the timings 631, 633 and 635 can be used for driving the television image in the odd field, and the electrodes 632 and 634 can be used for driving the even field. The even field timing driver IC and the odd field timing driver IC can be separately mounted on the left and right sides of the panel.

FIG. 7 shows a pixel electrode structure which is adapted to the purpose of driving while evenly pausing an even field and an odd field in which the timing electrode of FIG. 2 and the data electrode of FIG. 6 are combined. In FIG. 7, the pixel group sandwiched between the timing electrode and the data electrode drawn by the solid line and the pixel group sandwiched between the timing electrode drawn by the broken line and the data electrode represented by the alternate long and short dash line are separated. Therefore, it is possible to apply a rest drive to the other while driving one.

In FIG. 7, 710 is a timing board and 710 is a data board. 743 and 744 are data drivers, and 763 and 764 are timing drivers. Pixel P₁₁, P₁₃, P₁₅, P₃₃, P₃₅, P₅₃, P₅₅Is driven by the odd data driver 743 and the odd field timing driver 763, and P_{twenty two}, P_{twenty four}, P₄₂, P₄₄Are driven by the even data driver 744 and the even timing driver 764.₁₁, P₁₃, P₁₅, P₃₁, P₃₃, P ₃₅ , P₅₁, P₅₃, P₅₅Is driven by the even field pixel P._{twenty two}, P _{twenty four} , P₄₂, P₄₄The applied voltage of P is suppressed to 0, and conversely, when the even field is selected, the pixel for the odd field (P₁₁, ...) is used to suppress the application of voltage to 0.

FIG. 4 shows an electrode structure of a conventional dot matrix liquid crystal display device, in which 430 is a timing electrode substrate and 420 is a data electrode substrate. Reference numerals 411 to 414 are timing electrodes, and reference numerals 401 to 404 are data electrodes. The pixels are arranged in a square array, and there is no half pitch shift as in the present invention.

In FIG. 5, the pixel array is also a square array, but an electrode configuration of a multi-matrix liquid crystal display element in which complicated pixels are arrayed in the vertical direction of one timing electrode and driven by separate data electrode lines. Indicates. In FIG. 5, 530 is a timing board, 540 is a data board, 521 and 522 are timing electrodes, 501, 511, 502 and 512 are thin conductor lines for electrode extraction, which run on the timing electrodes. . Therefore, there are many concerns about disconnection.

[0021]

[Effect of device]

 As described above, a display panel for a liquid crystal television having a high yield and a high pixel density can be realized by the structure of the present invention in which the width and the position of the timing electrode are adjusted for the liquid crystal television display. In this description, it has been explained that the pixel position modulation in the vertical direction is performed at a 1/2 pixel pitch, but any person who wants to shift the position in three steps at a 1/3 pixel pitch is free. is there.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing an embodiment of the present invention.

FIG. 4 is a diagram showing an electrode configuration of a conventional matrix liquid crystal display element.

FIG. 5 is a diagram showing a known multi-matrix electrode configuration.

FIG. 6 is a view showing an embodiment of the present invention.

FIG. 7 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 102 timing board 104 data board 110 timing driver circuit 112 data driver circuit

Claims (5)

[Scope of utility model registration request] 1. A first transparent insulating substrate having a plurality of first transparent electrodes formed on the surface thereof, and a second transparent insulating substrate having a plurality of second transparent electrodes arranged facing the substrate. A transparent insulating substrate, a liquid crystal substance is sandwiched between the first and second transparent insulating substrates, and a timing signal voltage, which is a periodic function of time, is applied to the first transparent electrode, In a liquid crystal display device of a matrix pixel array in which a data signal voltage, which is a function of time and display information, is applied to the transparent electrode to perform time division driving, the second transparent electrode has a wide center width It has a shape in which a plurality of unit electrodes each having a narrow width and a constant length are connected in the length direction, and the second transparent electrodes adjacent to each other are displaced from each other by a length of ½ of the unit electrode in the length direction. The first transparent electrodes are arranged in a predetermined second transparent electrode. It has a shape facing the unit electrodes that are located at the poles and that are displaced from each other by at most half the length of the unit electrodes, and the facing portion between the first transparent electrode and the unit electrodes is a display pixel. Liquid crystal display device characterized by. 2. The liquid crystal display device according to claim 1, wherein the predetermined second transparent electrodes are all second transparent electrodes. 3. The predetermined second transparent electrode is an odd-numbered and even-numbered second transparent electrode alternately with respect to the arrangement of the first transparent electrodes. The described liquid crystal display device. 4. The liquid crystal display device according to claim 1, wherein the second transparent electrode has a stripe color filter structure in which one color is associated with each color. 5. The electrode structure according to claim 3, wherein when an odd-numbered first transparent electrode is selected, a data signal is applied to the second transparent electrode having a unit electrode facing the transparent electrode. Applying a voltage to the other second transparent electrode and the even-numbered first
The voltage between the transparent electrodes is set to zero, and when the even-numbered first transparent electrode is selected, the data signal voltage is applied to the second transparent electrode having the unit electrode facing the transparent electrode. The liquid crystal display device is characterized in that it is driven by setting the voltage between the other second transparent electrode and the odd-numbered first transparent electrode to zero.