KR830001992B1 - Driving Method of Liquid Crystal Display Device - Google Patents

Abstract

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Description

Driving Method of Liquid Crystal Display Device

1 is a layout view of a display segment of a conventional LCD.

2 (a) and 2 (b) are upper and lower electrode pattern diagrams of FIG.

3 is a layout view of the display segment of the LCD display.

4 (a) and 4 (b) are upper and lower electrode pattern diagrams of FIG.

5 (a) and 5 (b) are waveform diagrams of applied voltages used in the driving method of the liquid crystal display device according to the present invention.

Fig. 6 (a) and Fig. 6 (b) are a main part segment arrangement diagram for explaining an example of a driving method of a liquid crystal display element according to the present invention.

7 is a segment arrangement diagram for explaining another embodiment of a driving method of a liquid crystal display device according to the present invention.

8 (a) and 8 (b) are top and bottom electrode pattern views of FIG.

9 is a main segment arrangement diagram for explaining another embodiment of the driving method of the liquid crystal display device according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method of a liquid crystal display device, in particular a driving method of a liquid crystal display device in which three kinds of information are displayed in an analog manner.

FIG. 1 is a display layout diagram of a conventional liquid crystal display device, especially a liquid crystal display clock that performs an analog display of hour, minute, and second as three kinds of information. In FIG. 1, (1 ₁ ) (2 ₂ ) (1 ₃ ). … (1 ₆₀ ) denotes the minute display segment that also serves as the second display (hereafter referred to as the second display segment) (1), and this second and second display segment (1) is radially disposed on the outermost circumferential side on the dial (not shown). Divided into 60 equals. (2 ₁ ) (2 ₂ ) (3 ₃ ). … (2 ₆₀ ) is the hour display segment which also serves as minute display (hereinafter referred to as minute and second display segment) (2), and this minute and second display segment (2) is again unilaterally radiated from the inside of the second and minute display segment (1). Divided into 60 equal to 60 phases. Therefore, in Fig. 1, the display at 3:30:40

However, in the liquid crystal display clock according to the above configuration, when the liquid crystal display element having a segment of 120 displays is analog-displayed, in the above-described 1/2 bias and 1/2 dew time division driving method, the second (a) As shown in Fig. 2 (b), the number of terminal electrodes (60 upper electrode patterns 3), 60 common electrodes (lower electrode patterns 4) and 62 terminal electrodes is required. That is, since the maximum number of pins for driving LSI is 50, this LSI requires two chips. For this reason, more than twice as much space is required as compared to one conventional chip. For example, in a wrist watch, the thickness of the device is increased, and it is extremely difficult to reduce the size and weight. In addition, the production cost of the device was greatly increased by using two driving LSIs. Furthermore, since the number of connection points between the LSI and the substrate and between the substrate and the element increases, there are various drawbacks such as lowering the yield in the manufacturing process and lowering the reliability of the vibration during use of the watch.

In order to improve such a drawback, the liquid crystal display starter of the block division system which can reduce the number of terminals and can make a drive LSI into one chip is proposed. The display example of the 3rd or this block division method is shown, In this case, the state of 3:30 is displayed by the super cumulative display segment 1 and the split-time display segment 2. In this case, the electrode patterns formed corresponding to the display segments (1) and (2) are configured as shown in Figs. 4A and 4B. That is, FIG. 4 (a) is a part of the upper electrode pattern 7 formed on the inner surface of the upper plate 5, and the upper electrode pattern 7 shows the pair of 60 display segments 1 and 2 of FIG. 20 electrode patterns (7 ₁ ) (7 ₂ ) (7 ₃ )... … It consists of (7 ₂₀ ). 4B is a part of the lower electrode pattern 8 formed on the inner surface of the lower plate 6 so as to face the upper electrode pattern 7, and the lower national pattern 8 is the display segment of FIG. (1) (2) Ten sets of segment electrode patterns having six terminals formed by the same shape and segment electrode turns of adjacent blocks divided by the six-part block are electrically connected in series through a connection line. (8 ₁ ) (8 ₂ ) (8 ₃ )... … It consists of (8 ₁₀ ).

According to such a configuration, the number of terminals of the upper and lower electrode patterns 7 and 8 can be reduced to 26 terminals in total, 20 on the upper plate 5 side and 6 on the lower plate 6 side, and thus, for driving. LSI can be used as one chip.

However, in the liquid crystal display clock according to the above configuration, the driving LSI can be constituted by one chip, whereas as shown in FIG. 1, the second and second display segments 1 and 2 are displayed. It had a drawback that it was not possible to display arbitrary three pieces of information at the same time, namely, hours, minutes, and seconds, by selecting a predetermined segment.

Accordingly, the present invention is directed to a nuclear display device which uses a block division method to reduce the number of terminals and to display any three kinds of information simultaneously by properly combining old voltage waveforms with one LSI for driving as one chip. It is an object to provide a driving method. It demonstrates in detail using an Example below.

First, in the driving method of the liquid crystal display device according to the present invention, 1/3 duty block division driving is performed using the driving voltage waveforms as shown in Figs. 5 (a) and 5 (b). That is, the voltage waveforms θ ₁ to θ ₄ shown in FIG. 5 (a) are applied to the lower electrode pattern, and the voltage waveforms ψ ₁ to ψ ₆ shown in FIG. 5 (b) are respectively applied to the upper electrode pattern. do. In this case, the combination of the driving voltage waveforms θ ₁ to θ ₃ and ψ ₁ to ψ ₆ is the same as the voltage waveform of the conventional 1/3 bias 1/3 duty time division method, which is applied to the lower electrode pattern in this embodiment. Θ ₄ is newly added as the driving voltage waveform. In this case, the state diagram of the liquid crystal display element when the respective voltage waveforms are combined is as shown in Table 1 below. That is, it is possible to obtain by selecting or not selecting the blinking state of 4x6 = 24 kinds as the best state with respect to 3x8 = 24 kinds of combinations of the conventional 1/3 bias 1/3 duty time division method. . In Table 1, ON indicates a lighting state of the liquid crystal display element, and OFF indicates a non-lighting state.

TABLE 1

According to the block division waveform having such a driving voltage waveform, the upper and lower electrode patterns 7 and 8 form 120 display segments shown in FIG. 4 (a) and FIG. 4 (b). As shown in Fig. 2, an analog display for simultaneously displaying the hour, minute, and second can be easily performed in a combination of 4x5 = 20 types. That is, the number of terminals of twenty-six electrodes of twenty upper national patterns and six lower electrode patterns can simultaneously display minutes and seconds. In addition, the case of a display shown in Fig. 7, that is the 8 (a) is also a voltage waveform on the upper electrode pattern (12) ψ ₁ ~ ψ ₆ shown in,

6 (a), 6 (b), and 3, the liquid crystal display having the 120 display segments shown in FIG. 3 is block-divided image as shown in FIG. 4 (a) and 4 (b). And a main segment segment showing a driving method of simultaneously displaying three types of information, in particular, hours, minutes, and seconds, using the lower electrode patterns 7 and 8, and the same symbols as those of the above drawings are the same elements. The description is omitted. First, 6 (a) in Fig., Indicated by the horizontal stripes second gum minute display segments _{(110) (111)} and bungyeom when display segment ₍₂₁₎ (2 ₁₁₎ a to display the lighting segment ₍₂₁ To simultaneously display time in segments, minutes in segments 1 ₁₁ and 2 ₁₁ , and seconds in segments 1 ₁₀ , respectively, the fifth (a) is 5 (b) degrees

TABLE 2

This is possible by selecting and applying the voltage waveforms θ ₁ to θ ₄ , ψ ₁ , ψ ₃ , ψ ₄ , and ψ ₅ respectively (see Table 1 for ON and OFF indications).

In addition, in Fig. 6 (a), the cumulative display segment 1 ₆ (1 ₇ ) and the inspection display segment 2 ₄ (2 ₇ ) indicated by the hatching in the right inclined direction are lit and displayed to display the segment 2 _4. In order to simultaneously display time by selecting time in segments, minutes in segments 1 ₇ and 2 ₇ , and seconds in segments 1 ₆ , respectively, the voltage waveforms ψ ₁ to This can be done by selecting and applying ψ ₃ and θ ₁ to θ ₃ respectively (for ON and OFF indications, see Table 1 below).

TABLE 3

Similarly, the second cumulative display segment (1 ₄ ) (1 ₉ ) and the minute cumulative display segment (2 ₄ ) (2 ₉ ), which are indicated by the hatching in the left oblique direction in FIG. The voltage waveforms ψ ₁ to ψ ₂ and ₁ to θ ₂ are selectively applied to the state diagrams shown in Table 4 below.

TABLE 4

Similarly, in the case of performing an analysis display as shown in FIG. 6 (b), the second cumulative display segment (1 ₃ ) (1 ₁₁ ) and the minute bifurcation display segment (2) indicated by two rows of diagonal lines in the right oblique direction are shown. _{In 1} ) (2 ₁₁ ), this is possible by applying a voltage waveform based on the state diagram shown in Table 5 below. The second cumulative display segment (1 ₇ ) (1 ₈ ) and the minute and hour display segment (2 ₅ ) (2 ₇ ), indicated by two rows of slant in the left inclined direction, select the voltage waveform according to the state diagram shown in the following Table 6. It is possible by application.

Therefore, in the liquid crystal display with 120 display segments, to simultaneously display three pieces of information: hour, minute, and second, the applied voltage waveforms ψ ₁ to ψ _{6 to} the upper electrode and the applied voltage θ ₁ to θ ₄ to the lower electrode are displayed. 4 × 5 = 20 types of combinations except ψ ₆ are possible.

TABLE 5

TABLE 6

7 is a layout diagram of display segments of a liquid crystal display for explaining another embodiment of a driving method of a liquid crystal display according to the present invention. In Fig. 7, (9 ₁ ) (9 ₂ ) (9 ₃ ). … Numeral 9 ₆₀ denotes a hypermarked segment 9, which is divided radially into 60 radially around the outermost portion on a dial (not shown). (10 ₁ ) (10 ₂ ) (10 ₃ ). … Denoted at 10 ₆₀ is a superdisplay segment (hereinafter referred to as a minute and second display segment) 10, and the minute and second display segment 10 is the same radiation inside the second display segment 9 and also at the same time. Divided into 60 equal to 60 phases. (11 ₁ ) (11 ₂ ) (11 ₃ ). … (11 ₆₀ ) is a time display segment (hereinafter referred to as hour and minute and second display segment) that combines seconds and minutes, (11), and this hour and minute and seconds display segment 11 is the innermost peripheral side, It is arranged in equal parts on the same radiation side of the minute and second display segment 10. Follow this

8 (a) and 8 (b) show examples of electrode patterns formed corresponding to the display segments 9, 10 and 11 of FIG. That is, as shown in FIG. 8A, a part of the upper electrode pattern 12 formed on the inner surface of the upper plate 5, the upper electrode pattern 12 is formed of the three types of 60 display segments 9, 10, 11; It is divided into six sets of ten sets of blocks, and is composed of thirty electrode patterns 12 ₁ ((12 ₂ ) (12 ₃ ) ... ... (12 ₃₀ ) in a substantially fan shape facing each block. b) is a lower electrode pattern 8 formed on the inner surface side of the lower plate 6 corresponding to the display segments 9, 10 and 11, and the lower electrode pattern 8 is similar to that of FIG. Segment electrode patterns of adjacent blocks divided by each block are electrically connected in series via connecting lines, so that 10 sets of segment electrode patterns (8 ₁ ) (8 ₂ ) (8 ₃ ) with six terminals are provided. ₁₀ ).

With this configuration, phase, the number of terminals of the lower electrode pattern 12 (8), the top plate 5, the upper electrode pattern on the side (12 ₁₎ (12 ₂₎ (12: ₃₎ ... … 30 is required for (12 ₃₀ ), and the lower electrode patterns 8 ₁ (8 ₂ ) (8 ₃ ). … Since six pieces are required for (8 ₁₀ ), the total number of terminals can be reduced to 36 terminals. Therefore, the LSI can be driven by one chip. In addition, as shown in FIG. 7, when the three-needle display is performed in the same manner as the mechanical analog clock, the voltage waveform ψ ₁ to the fifth (b) in the upper electrode pattern 12 is shown.

FIG. 9 shows the liquid crystal display clock having 180 display segments shown in FIG. 7 as shown in FIG. 8 (a) and FIG. 8 (b). A main segment segment showing a driving method of simultaneously displaying three pieces of information, in particular, hours, minutes, and seconds, using the same symbols. In FIG. 9, for example, the second display segment 9 ₁₅ and the minute and second display segment 10 ₁₁ (10 ₁₅ ) and the hour and minute and second display ₁₁ indicated by hatching in the right oblique direction, for example ₁₁ ( ₁₁ ) ₁₅₎ the time into segments (11 ₁₎ to display light, and the minute segments (10, _11, 11, _11), the second to the segments ₍₉₁₅₎ (10 ₁₅₎ (11 ₁₅₎ at the same time respectively to display analogue The voltage waveforms θ ₁ to θ ₄ and ψ ₁ to ψ ₄ of FIG. 5 (a) and 5 (b) are selected and applied so as to be the state diagrams shown in Table 7 below.

TABLE 7

In addition, in the same figure, the super display segment 9 ₉ and the minute and second display segment 10 ₈ (10 ₉ ) and the hour and minute display segment 11 ₇ (11 ₈ ) indicated by the hatched in the left oblique direction are shown. ) Anal time into segments (11, ₇₎ to light up display _{(11. 9),} the minute segments (10, _8), (11, _8), the second by the segment ₍₉₉₎ (10 _9), (11, ₉₎ respectively at the same time To display the log, select the voltage waveforms θ ₁ to θ ₄ , ψ ₂ , ψ ₂ , ψ ₅ , and ψ ₆ of FIGS. 5 (a) and 5 (b) so that the state diagrams shown in Table 8 are as follows. It is possible by application.

TABLE 8

Similarly, the second display segment (9 ₄ ), the minute and second display segment (10 ₄ ) (10 ₁₀ ), and the hour and minute and second display segment (11 ₂ ) (11 ₄ ) (11 ₁₀ ), which are indicated by the horizontal pattern in the same drawing. ) And the simultaneous analog display are possible by selectively applying the voltage waveforms θ ₁ to θ ₄ , ψ ₁ , ψ ₃ , ψ ₄ , and ψ ₅ to the state diagram shown in Table 9 below.

Therefore, in the liquid crystal display clock having 180 display segments, the voltage waveforms ψ ₁ to ψ ₆ applied to the upper electrode and the voltage waveforms applied to the lower electrode θ ₁ to θ to simultaneously display three pieces of information: hour, minute, and second are displayed. _It is possible by the combination of 4x6 = 24 types of four.

In addition, the clock that combines alarm clock display, AM, PM display, date display, and day of the week display on the same side as the segment display screen

TABLE 9

As described above, it is necessary to simultaneously display various displays. In this case, it is not possible to divide blocks other than the analog display by 1/3 duty, so at least the date display and the day of the week display should be 1 / 3-1 / 3 time division drive system to reduce the number of terminals. Alarm display and AM. The PM indication should be static drive or 1 / 3-1 / 3 time division drive.

In the above embodiment, the driving method of the liquid crystal display clock has been described. However, the present invention is not limited to this, but is applied to the driving method of the driving device of the liquid crystal display device such as a bar display liquid crystal display clock and a measuring instrument. The same effect can be obtained.

As described above, according to the driving method of the liquid crystal display device according to the present invention, three types of information by LSI of one chip can be displayed at the same time. Therefore, between the LSI and the substrate, between the substrate, and between the elements. The number of connection points is greatly reduced, thereby improving the yield of the process and significantly improving the reliability of vibration. In addition, various outstanding effects are obtained that the shape of the device is reduced and the production cost of the device is greatly reduced.

Claims (1)

In a driving method of a liquid crystal display device in which an analog display is performed by dividing a plurality of electrodes corresponding to display at least three pieces of information arranged in large quantities between substrates, four types of voltage waveforms are provided on one electrode of the substrate. And at least five kinds of voltage waveforms applied to the other electrode of the substrate, thereby driving the liquid crystal 1/3 duty to display arbitrary three pieces of information at the same time.

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