KR20080010560A - Flexible display device - Google Patents

Abstract

A flexible display device is provided to make an aperture ratio of each unit cell or an aperture ratio of a horizontal cell line identical, to prevent moire generated periodically, thereby improving the picture quality of a display device. Two substrates form a plurality of cells(C), forming electrode patterns at regular gaps, and a partition wall(50) arranged between the two substrates in a honeycomb structure. The electrode patterns and the partition wall are arranged to make an aperture ratio of each cell identical. Transparent electrodes(60) are formed at a substrate displaying information between the two substrates. The transparent electrodes coincide with or are in parallel with any one side forming the honeycomb in the partition wall.

Description

Flexible display device

1 is a cross-sectional view of an essential part of a general collision charged electronic paper display device.

2 is a plan view schematically illustrating a main part of an electronic paper display device in which a conventional partition wall is disposed in a honeycomb structure;

3 is a photograph and an enlarged view illustrating a wave pattern phenomenon of a conventional electronic paper display device;

4 is a planar structure diagram illustrating an electrode and a partition wall arrangement structure of the flexible display device according to the first embodiment of the present invention;

5 is a reference view for comparison between the present invention and the prior art according to the pitch setting of the electrode and the partition wall,

6 is a reference view for explaining a change in the average aperture ratio according to the partition wall direction in the present invention,

7 is a planar structure diagram showing an electrode and a partition wall arrangement structure of the flexible display device according to the second embodiment of the present invention;

8 is a plan view showing an electrode and a partition structure of a flexible display device according to a third exemplary embodiment of the present invention;

9 is a plan view showing an electrode and a partition structure of a flexible display device according to a fourth exemplary embodiment of the present invention;

FIG. 10 is a plan view illustrating an electrode and a partition structure of a flexible display device according to a fifth exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

50: partition 60: transparent electrode

65: lower electrode C: cell

P _E : Pitch of electrode P _R : Pitch of partition wall

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible display device such as an electronic paper, and more particularly, to a flexible display device capable of improving display performance by adjusting an pattern of an electrode and a partition to improve an aperture ratio.

Electronic paper, which is a kind of flexible display device, is a new display device having advantages of existing display devices and printed paper, and is being developed as a representative next generation display device along with LCD, PDP, and organic EL devices.

Such electronic papers include a Zyricon type using twist balls, an electrophoresis type using electrophoresis and microcapsules, a cholesterol liquid crystal type using cholesterol liquid crystals, a collision charging type using toner particles, and the like.

Among them, the collision charge type electronic paper is a display element having a thickness of about 0.1 mm filled with white and black fine particles between transparent films, and is applied to a collision caused by applying an electric field by coating toner particles with silica or the like with a charge accelerator. It is made to have a charge determined by the charge accelerator.

1 is a cross-sectional view of an essential part showing an internal structure of a general collision charged electronic paper display device.

Referring to FIG. 1, the collision charging type electronic paper display device includes two fine particles 32 and 34 having different colors, for example, in respective spaces partitioned by partition walls 30 between two substrates 10 and 20. When white toner particles and black toner particles are distributed and a voltage is applied to the electrodes 12 and 22 patterned to cross each other on the two substrates 10 and 20, the positively charged particles are negatively charged particles to the negative electrode. By displaying the color by moving to the (+) electrode, it is possible to display information such as various characters or images.

In such an electronic paper display device, barrier ribs 30 are formed between two substrates 10 and 20. The barrier ribs 30 maintain a constant gap between the two substrates when the display device is bent. It plays an important role in preventing particles from moving unnecessarily to neighboring cells.

In general, the partitions provided in the display device are generally arranged in a rectangular lattice structure to form respective cell units. However, in the case of an electronic paper display device, since two substrates are formed in a very thin polymer film structure, the two barrier ribs have some elongation. Accurately bonding and matching the substrates becomes quite difficult. Accordingly, an electronic paper display device having a honeycomb structure in which a partition wall is arranged in order to align two upper and lower substrates and to secure sufficient support between the two substrates has been developed.

FIG. 2 is a detailed view of an essential part showing a schematic planar structure of an electronic paper display device in which a partition is arranged in a honeycomb structure, in which a partition 30A is arranged in a honeycomb structure between two substrates, and at a predetermined interval, a transparent electrode ( 12A) is disposed. Of course, toner particles for realizing color are distributed in the space inside each partition 30A.

For reference, FIG. 2 is a view illustrating an arrangement structure of the transparent electrode 12A on the upper substrate side of the two substrates on which the display is performed, and an opposite electrode crossing the transparent electrode is disposed on the lower substrate side not shown in the figure, and the transparent electrode is disposed. One unit cell is formed around the intersection of the counter electrode and the opposite electrode, and according to the driving state of the two electrodes intersecting the respective unit cells, the distribution of the toner particles is changed to display desired information.

However, the flexible display device having the electrode and the barrier rib arrangement structure as described above has a problem in that a wave pattern appears at regular intervals in the display process as shown in FIG. 3.

The main reason for the appearance of such a wave pattern is due to the change in the periodic aperture ratio according to the position of the electrode and the partition wall. Here, the aperture ratio may represent an area occupied by the partition wall in the unit cell configured around the electrode crossing point.

Referring to FIG. 2, in a state in which the electrodes 12A are arranged to have a predetermined interval, that is, a predetermined pitch P _E , the partitions 30A arranged in the honeymoon structure have the same area between the respective electrode pitches P _E. If it is not arranged to have, the aperture ratio of each unit cell C is different. That is, if the small area occupied by the partition wall (30A) as in the unit cell of the 'C _1' a 2, while a relatively large aperture ratio, the area occupied by the partition wall (30A) as in the unit cell of the 'C _2' In many cases, the opening ratio becomes relatively small.

As the section in which the aperture ratio increases or decreases is repeatedly displayed at regular intervals in the entire display apparatus, as shown in FIG. 3, the wave pattern phenomenon W having a constant repetition period on the screen D is displayed in the actual display process. Will appear.

Therefore, since the occurrence of the wavy pattern as described above leads to the deterioration of the image quality of the display device, in order to overcome this problem, the occurrence of the wavy pattern can be eliminated by appropriately setting the relationship between the electrode 12A and the partition wall 30A. A solution is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the flexible display which can realize a better image quality by eliminating the occurrence of wave pattern by keeping the aperture ratio of each unit cell or the aperture ratio of each horizontal cell line constant. The purpose is to provide this device.

In addition, an object of the present invention is to provide a flexible display device capable of eliminating the occurrence of fringes and improving image quality by setting an arrangement structure of electrodes and partitions to increase the aperture ratio of each unit cell as a whole.

According to an aspect of the present invention, there is provided a flexible display device including two substrates constituting a plurality of cells while electrode patterns intersecting with each other are formed at predetermined intervals, and partition walls disposed in a honeycomb structure between the two substrates. It is configured to include, wherein the electrode pattern and the partition wall is characterized in that the opening ratio of each cell is arranged to be the same.

Each of the partitions disposed in the cells may be configured to have the same area.

The pitch of at least one of the electrode patterns of the two substrates and the pitch of the partition wall may be configured to be the same.

The pitch of at least one of the electrode patterns of the two substrates may be configured to be an integer (n) times the pitch of the partition wall.

It is preferable that the electrode pattern is arranged so as to coincide with or parallel to one side of the honeycomb in the partition wall.

Preferably, the electrode pattern contrasted with the pitch of the barrier rib is an electrode pattern formed on the substrate on which the information is externally displayed in the display device.

In addition, the flexible display device according to the present invention for realizing the above object comprises a partition arranged in a honeycomb structure between the two substrates, and a transparent electrode formed on the substrate of the information display side of the two substrates The transparent electrode may be arranged to coincide with or parallel to any one side forming the honeycomb in the partition wall.

In addition, the flexible display device according to the present invention for realizing the above object comprises a partition arranged in a honeycomb structure between the two substrates, and a transparent electrode formed on the substrate of the information display side of the two substrates The aperture ratio of the cell line positioned around the transparent electrode may be the same as the aperture ratio of the cell line positioned around the other transparent electrode.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

For reference, in describing each embodiment of the present invention, since the basic cross-sectional structure of the flexible display device according to the present invention has a structure as shown in FIG. 1, a detailed description thereof will be omitted and shown in FIG. 2. It will be described based on the arrangement structure of the electrode and the partition wall through a schematic plan view in contrast to the prior art. In addition, when describing each embodiment with reference to drawings, the same reference numeral is attached | subjected about the same and similar component part, and the repeated description about it is abbreviate | omitted.

4 is a diagram illustrating an electrode and a partition structure of a flexible display device according to a first embodiment of the present invention.

As shown, the partition walls 50 disposed between the two substrates are formed in a honeycomb structure, and although not shown in the drawings, two partitions 50 having different colors, such as white toner particles and black toner particles, are formed in the interior space of each partition wall 50. More than one fine particle is distributed.

In addition, the upper and lower substrates are formed by patterning the transparent electrode 60 and the lower electrode 65 that cross each other, and a unit around the portion where the transparent electrode 60 and the lower electrode 65 cross each other. While constituting the cell C, according to the driving state of the two electrodes intersecting with each unit cell C, the distribution of the toner particles is varied so as to display desired information.

The first embodiment having such a basic structure is configured such that the pitch of the transparent electrode 60 and the partition wall 50 is the same, and the transparent electrode 60 coincides with one side of the honeycomb structure in the partition wall 50 or Have a configuration arranged to be parallel.

Here, the transparent electrode 60 is a plurality of electrodes are arranged in parallel in the horizontal direction at regular intervals as shown in the figure, wherein the pitch (P _E ) of the electrode is the shortest distance between the adjacent electrode and the electrode. The pitch P _R of the barrier rib 50 is a distance from the inner space of the barrier rib 50, that is, from the center of the honeycomb to the center of another honeycomb adjacent in the direction perpendicular to the traveling direction of the electrode.

In the pitch condition of the transparent electrode 60 and the partition wall 50, the transparent electrode 60 and the partition wall 50 may have the same pitch P _E between the two adjacent electrodes and the pitch P _R between the partition wall 50. Is placed.

When the pitches of the transparent electrode 60 and the partition wall 50 are set to be the same, the aperture ratio between the unit cells C arranged above and below the center of all the transparent electrodes 60 is the same. As a result, as shown in FIG. 3, it is possible to eliminate the wave pattern phenomenon that occurs while the aperture ratio is periodically changed.

That is, in two cell lines CL ₁ and CL ₂ adjacent to each other in FIG. 4, the sum of the total aperture ratios of the respective lines is always the same, thereby preventing the occurrence of wave patterns in the display process.

For reference, the aperture ratio of each cell C may vary depending on the distance between the lower electrodes 65 disposed to cross the transparent electrodes 60, but the pitch P _E between the lower electrodes 65 may vary. If the pitch P _R 'of the partition wall 50 in the array direction of the lower electrode 65 is set to be the same, the aperture ratios of the respective cells C are equal to each other. Not only can the phenomenon be eliminated, but excellent image quality can be achieved according to the same aperture ratio. Particularly, when the flexible display device to which the present invention is applied is a double-sided display type, both sides of the flexible display device can realize good image quality while removing a wave pattern phenomenon.

5 is a view for explaining the change in the aperture ratio of the embodiment of the present invention and the prior art as described above, when the difference between the aperture ratio of the present invention and the prior art with reference to this figure and the following table.

In FIG. 5, (a) is a view showing a state in which the pitches of the transparent electrode 60 and the partition wall 50 are set to 1: 1 according to the above embodiment, and (b) is the pitch of the electrode and the partition wall 50. Is a diagram showing a state of setting 1: 1.06. In this case, when the pitch of the electrode is set to be 360um in both (a) and (b), the pitch of the partition 50 in (a) is 360um, and the pitch of the partition 50 in (b) is set to 380um. do.

The change in the aperture ratio under the two setting conditions is shown in Table 1 below.

TABLE 1

As shown in the above table, when the pitch of the barrier rib 50 is also set to 360 um (FIG. 6 (a)), as shown in the above table, it can be seen that the opening ratio is constant without changing in each cell unit. When the pitch of the barrier rib 50 is 380 um and 1.06 times the pitch of the electrode as shown in the related art (Fig. 6 (b)), the opening ratio is periodically changed in each of the upper and lower cell units.

  Therefore, when the pitch of the transparent electrode 60 and the partition 50 is set differently as in the related art, the aperture ratio is periodically changed, which causes a wave pattern. However, as in the present invention described in the above embodiment, the transparent electrode 60 If the pitch of) and the pitch of the barrier rib 50 are the same, the periodic change of the aperture ratio does not appear in each step in the up and down steps, and the same makes it possible to eliminate the wave pattern phenomenon.

Next, FIG. 6 is a comparative view showing a change in the average aperture ratio according to the direction of the electrode 60 and the partition wall 50 in the configuration of the embodiment, (a) is the one side direction of the partition wall 50 and the transparent electrode 60 (B) is a figure of the structure arrange | positioned so that one side of the partition 50 and the electrode (does not correspond).

(A) and (b) in FIG. 6, both sides of the partition 50 and the electrode 60 coincide with each other under the condition that both vertical pitches of the barrier 50 are set to 360 um. In the case of arrangement, the maximum aperture ratio was 95.7%, and the minimum aperture ratio was 93.7%. And as shown in (b), when the one side of the partition 50 and the electrode 60 were arrange | positioned so that it might not correspond, the maximum opening rate was 94% and the minimum opening rate was 91.3%.

In this way, when the one side direction of the partition 50 and the electrode are arranged so as to coincide or parallel, it can be seen that the average opening ratio becomes high as a whole and the opening ratio deviation is also small.

Therefore, in the case where the direction of one side of the partition wall 50 and the direction of the electrode are configured as described above, a higher aperture ratio can be obtained, and the variation of the aperture ratio is smaller, thereby realizing a desired color clearly and generating a wave pattern. It can also be minimized.

7 is a view showing a second embodiment of the present invention, illustrating a structure in which each cell is arranged to have the same aperture ratio under the condition that the direction of the electrode and the direction of the partition wall 50 do not coincide.

As shown in the drawing, the transparent electrode 60 forms a 'V'-shaped portion of the partition wall 50 under the condition that the pitch P _E of the transparent electrode 60 and the pitch P _R of the partition wall 50 are 1: 1. When configured to penetrate through, the partition wall 50 located in each cell C has the partition wall 50 in a substantially 'Y' shape as shown in the enlarged view, and the area of the partition wall existing in each cell is the same. As they become, they have the same aperture ratio as a whole.

Therefore, as in the above-described first embodiment, since the aperture ratio is the same around each transparent electrode 60, the moiré phenomenon does not occur as in the prior art, and the aperture ratio of all the cells C is also the same. It is possible to improve the image quality of the entire display.

8 is a view showing a third embodiment of the present invention, which is basically similar to the configuration of the second embodiment described above, except that the transparent electrode 60 is arranged to pass through the center portion of the partition wall 50. The illustrated figure.

When the electrode 60 is disposed as described above, although the aperture ratios of the respective cells C may not all be the same, the cells C ₁ having a relatively high aperture ratio and the relatively low cells C as shown in the enlarged view. _{Since 2} ) is immediately neighboring and repeated, due to the characteristics of a display having a cell of a small size, a wave pattern does not occur unlike the prior art which is regularly periodically repeated.

In the above-described embodiments, the pitch of the transparent electrode 60 and the pitch of the barrier rib 50 are the same as described above. However, in the embodiment to be described below, the pitch of the electrode 60 is equal to the pitch of the barrier rib 50. The structure arranged so that it becomes an integer multiple of 2 times or more than pitch is demonstrated and demonstrated.

FIG. 9 is a diagram showing a fourth embodiment of the present invention, illustrating a structure in which the pitch of the transparent electrode is arranged to be twice the pitch of the partition wall 50.

As illustrated, when the pitch P _E of the transparent electrode 60 is disposed to be twice the pitch P _R of the partition 50, the partition 50 having the same shape exists in each cell C. As a result, each cell has the same aperture ratio.

As a result, as described in the above embodiments, the same aperture ratio is obtained as a whole, and thus a phenomenon in which a wave pattern occurs is eliminated.

FIG. 10 is a view showing a fifth embodiment of the present invention, illustrating a structure in which the pitch P _E of the electrode 60 is three times the pitch P _R of the partition 50. Since the aperture ratio is constant as a whole as in the fourth embodiment, the phenomenon in which the wave pattern occurs in the fifth embodiment is eliminated, and when the aperture ratio is formed as a whole, a better image quality can be realized.

In the above, the pitch P _E of the electrode 60 exemplifies a structure in which the pitch P _R of the partition 50 is two or three times, but may be configured as an integer multiple of four times larger than this. In order to avoid, the drawings and detailed description will be omitted.

As described above, the structure of the present invention which removes the wave pattern phenomenon, which has occurred in the past, has a structure in which the aperture ratio of each cell C is formed equally, and the pitch of the electrode 60 compared to the pitch of the partition wall 50 is an integer multiple. Generation of wave patterns as shown in FIG. 3 can be prevented through a structure configured such that the total aperture ratios of the cell lines positioned at the upper side and the lower side around the adjacent transparent electrode 60 are the same. In the case where the direction of the electrode and the partition wall are coincident with each other, the aperture ratio can be improved to improve the display quality.

The flexible display device according to the present invention configured and operated as described above may be configured to have the same aperture ratio of each unit cell or to have the same aperture ratio of a cell line in the horizontal direction, thereby preventing the occurrence of wave patterns at regular intervals. It provides an advantage that can contribute to the improvement of display quality.

 In addition, the present invention can improve the aperture ratio of each unit cell as a whole, and also reduce the variation of the aperture ratio, thereby minimizing the occurrence of wave patterns and providing an advantage of enabling more clear and excellent image quality.

Claims (8)

The electrode patterns that cross each other are formed at regular intervals, and comprises two substrates constituting a plurality of cells and partition walls disposed in a honeycomb structure between the two substrates, The electrode pattern and the partition wall are arranged such that the aperture ratio of each cell is the same. The method according to claim 1, The flexible display device, characterized in that the area of the partitions disposed in each of the cells are the same. The method according to claim 1, And a pitch of at least one electrode pattern of the two substrates and a pitch of the partition wall are the same. The method according to claim 1, The pitch of the at least one electrode pattern of the two substrates is configured to be an integer (n) times the pitch of the partition wall. The method according to claim 1, And the electrode pattern is arranged to coincide with or parallel to one side of the honeycomb in the partition wall. The method according to claim 1, The electrode pattern in contrast to the pitch of the partition wall is a flexible display device, characterized in that the electrode pattern formed on the substrate on the side of the information is displayed on the outside. A barrier rib disposed in a honeycomb structure between the two substrates, and an electrode pattern formed on the substrate on which the information is displayed; And the electrode pattern is arranged to coincide with or parallel to one side of the honeycomb in the partition wall. A barrier rib disposed in a honeycomb structure between the two substrates, and an electrode pattern formed on the substrate on which the information is displayed; And an aperture ratio of a cell line positioned around the electrode pattern is the same as an aperture ratio of a cell line positioned around another transparent electrode.

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