JP4743979B2 - Display device and display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device in which two substrates are arranged to face each other as a display means, such as an organic EL, a plasma display, a liquid crystal display device, etc., and a driver IC for driving the display means is further mounted on this device. The present invention relates to a display device provided with the flexible circuit board. And it is related with the display apparatus carrying this display apparatus.
[0002]
[Prior art]
In recent years, various display devices such as an organic EL and a liquid crystal display device have been developed. For example, a liquid crystal display device is used for a display device such as a mobile phone or a portable position measurement system (commonly called GPS). . The liquid crystal display device is required to have characteristics such as downsizing, low power consumption, and outdoor applicability.
[0003]
In order to meet this demand, reflective liquid crystal display devices and transflective liquid crystal display devices characterized by good visibility outdoors have been used.
[0004]
In these liquid crystal display devices, monochrome display panels have been conventionally used in applications such as mobile phones, and a one-chip liquid crystal driver IC has been used.
[0005]
As a mounting method in these liquid crystal display devices, COG mounting in which a liquid crystal driving driver IC is directly mounted on a transparent substrate has been proposed, but in addition, a flexible circuit board (hereinafter, the flexible circuit board is abbreviated as FPC) is proposed. The mounting technology used is also presented.
[0006]
As technologies using this FPC, COF (chip-on-flex) mounting using an FPC on which a liquid crystal driving driver IC is mounted, and a tape carrier package (hereinafter, tape carrier package is abbreviated as TCP) incorporating a liquid crystal driving driver IC. TAB (Tape Automated Bonding) mounting using the
[0007]
An outline of a simple matrix type reflective monochrome liquid crystal display device using these COF mounting, TAB mounting, and COG mounting will be described with reference to FIGS.
[0008]
6 is a plan view of a liquid crystal display device mounted with COF, FIG. 7 is a plan view of a liquid crystal display device mounted with TAB, and FIG. 8 is a plan view of the liquid crystal display device mounted with COG.
[0009]
First, the liquid crystal display device 1 of FIG. 6 will be described. A liquid crystal display panel 2 which is a main component of the liquid crystal display panel 2 has a large area signal side glass substrate 3 and a small area scanning side glass substrate 4 bonded together via liquid crystal. The FPC 6 in which the liquid crystal driving driver IC 5 is mounted is attached to the signal side glass substrate 3.
[0010]
The FPC 6 is obtained by sequentially bonding a base film made of polyimide or polyester, a wiring pattern made of copper foil, and a coverlay made of polyimide or polyester with a polyester adhesive.
[0011]
In addition to the driver IC 5 for driving the liquid crystal, a circuit component (not shown) such as a capacitor can be mounted on the FPC 6.
[0012]
Reference numeral 7 denotes a signal wiring made of ITO formed in a non-display area on the signal side glass substrate 3 in order to energize the display portion of the liquid crystal display panel 2 and the FPC 6.
[0013]
The TAB mounting liquid crystal display device 8 of FIG. 7 uses a TCP 9 mounted with a liquid crystal driving driver IC 5 in place of the FPC 6 used in the liquid crystal display device 1.
[0014]
In the COG-mounted liquid crystal display device 10 of FIG. 8, the driver IC 5 for driving the liquid crystal is mounted in a non-display area on the signal side glass substrate 3, and circuit components such as capacitors (not shown) are mounted on the non-display area. FPC 11 mounted with a) is affixed, and a signal is input to the driver IC 5 for driving the liquid crystal.
[0015]
[Problems to be solved by the invention]
As described above, a liquid crystal display device for use such as a cellular phone is a monochrome type using COF mounting, TAB mounting, and COG mounting.
[0016]
On the other hand, in recent years, a color type liquid crystal display device has been demanded, and in particular for mobile phone applications, from a monochrome liquid crystal display panel to a color liquid crystal display panel for the reflective / transflective liquid crystal display device. Transition is progressing.
[0017]
Therefore, the amount of information handled as a display device such as a portable terminal increases with such colorization, and therefore, a large-screen liquid crystal display panel with a larger number of dots is desired.
[0018]
However, the liquid crystal display devices 1, 8, and 10 of the mounting methods shown in FIGS. 6 to 8 as described above have a structure in which the liquid crystal driving driver IC 5 and the display portion are arranged in parallel. The wiring length becomes uneven, and the difference becomes remarkable, and this reduces the display quality due to the wiring resistance difference. For example, the voltage applied to the electrodes in the display portion due to the wiring resistance being different between each pixel. The waveform is distorted, which causes a difference in effective voltage applied to the liquid crystal, resulting in density unevenness. This density unevenness is a very remarkable problem in a color liquid crystal display device.
[0019]
In order to solve this problem, it is conceivable to improve the resistance gap by adjusting the pattern width of the signal wiring 7, but there is a limit to the technology. Therefore, metal wiring using Al or the like instead of signal wiring using ITO has been studied.
[0020]
However, it is necessary to establish technology for this purpose and to introduce equipment, etc. Also, if metal wiring patterns are overcrowded, mass productivity is reduced due to a decrease in manufacturing yield, so it is necessary to expand the non-display area. On the other hand, a liquid crystal display panel with a narrow frame cannot be obtained, which makes it unsuitable for use as a portable terminal.
[0021]
In addition, in mobile terminals such as mobile phones, the market needs to be made smaller and thinner and lighter, but it can be said that it has not yet been satisfied.
[0022]
In addition, the TAB-mounted liquid crystal display device 8 incorporating the liquid crystal driving driver IC shown in FIG. 7 and using TCP has a problem that the number of parts increases and the process becomes complicated. This point is shown in FIGS.
[0023]
9 is a developed plan view of the liquid crystal display device 8a, FIG. 10 is a plan view of the back side of the liquid crystal display device 8a, and FIG. 11 is a sectional view thereof.
[0024]
In the liquid crystal display device 8a, the TCP 9 on which two sets of driver ICs 5 for driving the liquid crystal are mounted is provided on the end surface of the signal side glass substrate 3. A printed circuit board P is connected to one TCP 9 and the printed circuit board P is connected. Is provided with an FPC 6a.
[0025]
The liquid crystal display device 8a is assembled in the following order.
The electrode terminals formed on the peripheral edge of the liquid crystal display panel 2 and the TCP 9 are attached via an anisotropic conductive film, and then crimped and connected at a high temperature of about 200 ° C.
[0026]
Next, a printed circuit board P on which circuit components are mounted in advance is disposed on the back surface of the liquid crystal display panel 2, each TCP 9 is bent toward the printed circuit board P, and the terminals on the printed circuit board P and the terminals of the TCP 9 are soldered H. Thereafter, the FPC 6a is solder-connected to the printed circuit board P.
[0027]
Thus, the number of connection points of each member has five connection parts such as two places of the liquid crystal display panel 2 and the TCP 9, two places of the TCP 9 and the printed board P, and one place of the printed board P and the FPC 6a. The process becomes complicated, the manufacturing yield decreases, and the manufacturing cost increases.
[0028]
Accordingly, the object of the present invention is to simplify the manufacturing process to increase the manufacturing yield and mass productivity, achieve high density wiring and narrow the frame of the display panel, and prevent a difference in effective voltage applied to the liquid crystal. Accordingly, it is an object of the present invention to provide a display device with high quality, high reliability and low cost.
[0029]
Another object of the present invention is to provide a display device that is reduced in size and thickness.
[0030]
Still another object of the present invention is to provide a liquid crystal display device suitable for color display.
[0031]
Another object of the present invention is to provide a portable terminal and a display device that are mounted with the display device of the present invention and achieve high quality, high reliability, low cost, miniaturization and thinning. .
[0032]
[Means for Solving the Problems]
  The display device of the present invention includes:One substrate, the other substrate disposed to face the one substrate, and a flexible substrate provided so as to cover the outside of the one substrate and mounted with a driver IC, the other substrate, A first electrode terminal along one side of the other substrate and a second electrode terminal along the other side of the other substrate; the flexible substrate has a first terminal and a second terminal; The first electrode terminal of the other substrate and the first terminal of the flexible substrate are electrically connected, and the second electrode terminal of the other substrate and the second terminal of the flexible substrate are: A slit is formed in the flexible substrate that is electrically connected and located between the first terminal and the second terminal..
[0033]
  In addition, it is preferable to further include a liquid crystal layer interposed between the one substrate and the other substrate.
[0034]
More specifically, a reflective type in which a light reflecting layer is formed on the outer surface or inner surface of one transparent substrate in a liquid crystal display device in which liquid crystal is interposed between two transparent substrates formed by sequentially laminating a transparent electrode and an alignment layer. A liquid crystal display device, wherein a flexible circuit board on which a driver IC for driving a liquid crystal is mounted is disposed outside one transparent substrate, and further between a terminal formed on the other transparent substrate and a terminal on the flexible circuit board Is electrically energized and fixed by means of electrical connection means, whereby a signal is inputted from a driver IC for driving the liquid crystal.
[0035]
The display device of the present invention is equipped with various display devices such as the liquid crystal display device of the present invention.
[Action]
In the display device of the present invention, two substrates are arranged to face each other to form a display means, and a flexible circuit board on which a driver IC for driving the display means is mounted so as to cover the outside of one of the boards, Further, a terminal on the inner surface of the flexible circuit board and a terminal formed on the other board are connected via an electrical connection means, and a signal is input from a driver IC, so that a display device such as a conventional liquid crystal display device is provided. Thus, the wiring pattern routed in the non-display area becomes extremely small or unnecessary.
[0036]
Therefore, for example, in the conventional mounting type liquid crystal display device, the width of the non-display area is required to be about 4 to 5 mm in the 1.5 inch class liquid crystal panel. In contrast, in the liquid crystal display device of the present invention, The width of the liquid crystal display panel can be reduced to about 1 mm, thereby eliminating an increase in the size of the liquid crystal display panel due to overcrowding of wiring patterns and expansion of a non-display area.
[0037]
In addition, as in the above configuration, the terminal formed on the other transparent substrate and the terminal on the flexible circuit board are connected via an electrical connection means, and thereby a signal is input from the driver IC. Thus, the number of connection points of each member is reduced, thereby simplifying the process. As a result, the manufacturing yield can be improved and the manufacturing cost can be reduced.
[0038]
In addition, the terminal formed on the other transparent substrate and the terminal on the flexible circuit board are connected via an electrical connection means, whereby a signal is input from the driver IC, that is, the display portion. The structure in which the driver ICs are stacked on top eliminates the wiring resistance difference caused by the wiring length of the wiring pattern and eliminates the rounding of the voltage waveform applied to the electrodes in the display area, resulting in density unevenness. As a result, the display quality is improved, and particularly in a color liquid crystal display device in which one chip of a liquid crystal driving driver IC is arranged.
[0039]
The applicant of the present application has already proposed a liquid crystal display device in which a liquid crystal driving driver IC and a long circuit board are arranged on the back surface of the liquid crystal display panel. However, it can be said that the following problems still exist. .
[0040]
The circuit board has a multi-layer wiring structure in which a single-layer wiring or two or more wiring layers are formed inside a glass epoxy board. For this reason, the board thickness is extremely large, and the market needs for the recent thinning are still satisfied. I don't get it. In addition, the terminals of the circuit board having the substrate thickness and the terminals on the transparent substrate are connected by wire bonding. However, since the wire length is increased, the bonding accuracy is insufficient. In addition, by arranging the long circuit board in the non-display area, the mounting portion of the driver IC for driving the liquid crystal is also limited.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the display device of the present invention will be described using a liquid crystal display device.
An outline of the reflective liquid crystal display device of the present invention will be described with reference to FIGS. 1 to 5 by taking a simple matrix type (STN) color display as an example.
[0042]
FIG. 1 is a plan view of the reflective liquid crystal display device 12 as viewed from the back side, FIG. 2 is a cross-sectional view taken along line AA ′ in FIG. 1, and FIG. It is sectional drawing by -B '. 4 is a plan view showing the configuration of the transparent electrode of the liquid crystal display panel 13 constituting the main part of the liquid crystal display device 12, and FIG.
[0043]
As shown in FIGS. 1 to 3, the liquid crystal display device 12 includes a large-area rectangular signal-side glass substrate 14 that is the other transparent substrate, and a small-area rectangular scanning side that is the one transparent substrate. In this structure, the glass substrate 15 is bonded to the glass substrate 15 via a liquid crystal.
[0044]
A rectangular display area is formed with this liquid crystal, and the FPC 16 which is the flexible circuit board having substantially the same shape as the display area is further arranged outside the scanning side glass substrate 15. In this arrangement, the FPC 16 is performed by using an adhesive (not shown) such as a double-sided tape on the outside of the scanning side glass substrate 15.
[0045]
Then, in the vicinity of one side edge that is a non-display area of the signal side glass substrate 14, one side edge of one main surface of the rectangular FPC 16 is provided on a portion that does not face the scanning side glass substrate 15.
[0046]
For this attachment, a terminal formed on the signal side glass substrate 14 and a terminal on the FPC 16 are connected and fixed via an electrical connection means such as an anisotropic conductive film. Such connection fixing is performed by one end of one main surface of the rectangular FPC 16 and the other end orthogonal to the one main surface.
[0047]
The FPC 16 is obtained by sequentially bonding a base film made of polyimide or polyester, a wiring pattern made of copper foil, and a coverlay made of polyimide or polyester with a polyester adhesive.
[0048]
Since the liquid crystal display device 12 is a simple matrix type (STN), these related members are shown as follows in FIGS.
[0049]
On the FPC 16, a scanning side liquid crystal driving driver IC 5a, a signal side liquid crystal driving driver IC 5b, a circuit component k such as a capacitor, and an external signal input terminal G are mounted. The external signal input terminal G is an input terminal for a power source, a timing signal, an image signal, and the like.
[0050]
Further, t1 is a scanning side electrode terminal, t2 is a signal side electrode terminal, 17 is a transparent electrode pattern on the scanning side formed on the scanning side glass substrate 15, and 18 is formed on the signal side glass substrate 14. The transparent electrode pattern on the signal side, and both the transparent electrode patterns are orthogonal to each other.
[0051]
Regarding the transparent electrode patterns 17 and 18, the configuration of the liquid crystal display panel 13 is as follows.
[0052]
As shown in FIG. 5, a light reflection layer 19 formed of a metal thin film made of Al is formed on the inner side surface of the scanning side glass substrate 15, and the color filter 20 disposed for each pixel on the light reflection layer 19. An overcoat layer 21 made of acrylic resin, a transparent electrode 22 made of ITO, and an alignment film 23 made of polyimide resin rubbed in a certain direction are sequentially laminated.
[0053]
Further, a transparent electrode 24 made of ITO, SiO 2 on the signal side glass substrate 14.₂An insulating layer 25 made of the above and an alignment film 26 made of polyimide resin rubbed in a certain direction are sequentially laminated. Then, the signal side glass substrate 14 and the scanning side glass substrate 15 are bonded together with a sealing material through the liquid crystal 27, and the liquid crystal 27 is sealed. At that time, the transparent electrodes 22 and 24 are orthogonal to each other, The intersection is formed with each pixel to constitute a simple matrix reflective color liquid crystal display device 12.
[0054]
On the display surface side of the liquid crystal display device 12, a retardation plate (not shown) made of polycarbonate or the like and an iodine-based polarizing plate (not shown) are sequentially attached using an adhesive material made of an acrylic material. wear.
[0055]
According to the liquid crystal display device 12 having the above configuration, the transparent electrode 22 formed on the scanning side glass substrate 15 and the transparent electrode 24 formed on the signal side glass substrate 14 correspond to the transparent electrode patterns 17 and 18.
[0056]
The transparent electrode 22 (transparent electrode pattern 17) is formed on the signal side glass substrate 14 by arranging a conductive member such as an Ag material between the substrate 14 and the substrate 15 or using a sealing material containing conductive particles. The wiring formed of ITO is energized, and this wiring is extended to the non-display area on the signal side glass substrate 14 to form the terminal t1.
[0057]
The transparent electrode 24 (transparent electrode pattern 18) extends to a non-display area on the signal side glass substrate 14 to form a terminal t2.
[0058]
The terminal t1 corresponds to the transparent electrode pattern 17, the terminal t2 corresponds to the transparent electrode pattern 18, and both the terminals t1 and t2 are arranged at portions that do not face each other on both sides of the display screen.
[0059]
Further, the scanning side electrode terminal t1 and the signal side electrode terminal t2 in which the Au layer is formed on the copper foil pattern are also formed on the FPC 16, and the terminal t1 corresponding to the transparent electrode pattern 17 and the scanning side electrode terminal on the FPC 16 are formed. t1 is pasted through an anisotropic conductive film, and crimping connection is performed at a high temperature around 200 ° C.
[0060]
Similarly, the terminal t2 corresponding to the transparent electrode pattern 18 and the signal side electrode terminal t2 on the FPC 16 are pasted through an anisotropic conductive film, and then crimped and connected at a high temperature of about 200 ° C. Thus, signals can be input to the display portion of the liquid crystal display panel 13 from the driver ICs 5a and 5b for driving the liquid crystal through the anisotropic conductive film.
[0061]
Thus, according to the liquid crystal display device 12 of the present invention, the liquid crystal display device 12 can be assembled with only two connection parts by an electrical connection means such as an anisotropic conductive film, thereby simplifying the process and improving the production yield. Manufacturing cost is reduced.
[0062]
Further, since the electrical connection means is formed as described above, the width of the non-display area of the signal side glass substrate 14 is reduced, as in the conventional liquid crystal display devices 1, 8, and 10 shown in FIGS. The wiring pattern that was routed in the non-display area is no longer necessary.
[0063]
For example, the liquid crystal display device 12 of the present invention is compared with the COF-mounted liquid crystal display device 1 shown in FIG. 6 as shown in FIG. Both are 1.5-inch class liquid crystal panels.
[0064]
2A is a cross-sectional view taken along the section line B-B ′ in FIG. 1 as in FIG. 2, and FIG. 17B is a cross-sectional view of the liquid crystal display device 1 on the same basis.
[0065]
As shown in FIG. 17 (a), the width A of the non-display area in the liquid crystal display device 12 of the present invention can be reduced to about 1 mm, but the liquid crystal display device 1 in FIG. The width B of the non-display area needs to be about 5 mm.
[0066]
As described above, in the conventional liquid crystal display devices 1, 8, and 10, as the number of scanning lines increases, as the liquid crystal display panel becomes larger, the non-display area must be enlarged and the width thereof must be increased. However, in the liquid crystal display device 12 of the present invention, the width A of the non-display area is 3 mm or less, preferably 2 mm or less, and optimally 1 mm or less, depending on the size of the liquid crystal display panel 13. As a result, the increase in the size of the liquid crystal display panel 13 due to the overcrowding of the wiring pattern and the expansion of the non-display area was eliminated.
[0067]
Furthermore, in the present invention, the wiring resistance difference due to the wiring length of the conventional wiring pattern is eliminated, and accordingly, density unevenness due to the rounding of the voltage waveform applied to the electrode in the display portion does not occur, Therefore, the display quality was improved.
[0068]
In addition, in the display portion of the liquid crystal display panel 13, the liquid crystal driving driver ICs 5a and 5b are arranged close to the terminals t1 and t2 corresponding to the transparent electrode patterns 17 and 18, thereby reducing the wiring length. This also improved the display quality.
[0069]
Next, another embodiment of the present invention is shown in FIGS. Each of these figures corresponds to FIG. 1, and any of the liquid crystal display devices 12a, 12b, 12c, 12d, and 12e is a plan view viewed from the back side. In addition, the same code | symbol is attached | subjected to the same location as the liquid crystal display device 12 of FIG.
[0070]
In the liquid crystal display device 12a shown in FIG. 12, the slits 28 are formed obliquely between the scanning side electrode terminal t1 and the signal side electrode terminal t2 formed on the peripheral edge of the FPC 16, so that anisotropy occurs at two locations. In joining using an electrical connection means such as a conductive conductive film, connection errors and stress due to expansion during thermocompression bonding can be relaxed, and reliability can be further improved.
[0071]
In the liquid crystal display device 12b shown in FIG. 13, two types of liquid crystal driving driver ICs 5a and 5b are integrated into one liquid crystal driving driver IC 5c to form one chip, thereby reducing the number of steps for assembling the FPC 16 and manufacturing costs. Can be reduced.
[0072]
In each of the liquid crystal display devices 12, 12a, and 12b described above, the driver ICs 5a, 5b, and 5c for driving the liquid crystal are disposed on the outer surface of the FPC 16, but instead, the liquid crystal display device 12c shown in FIG. Arranged on the inner surface.
[0073]
In such a configuration, the connection terminal of the driver IC for driving the liquid crystal and the connection terminal of the liquid crystal display panel 13 are formed on the same surface of the FPC 16 so that they are formed on both main surfaces. Thus, the fine wiring pattern of the FPC 16 can be easily formed, thereby improving the manufacturing yield.
[0074]
In the liquid crystal display device 12d shown in FIG. 15, the external signal input terminal is pulled out as a terminal that can be connected by the FPC connector 29, which eliminates the need for signal input directly under the display device. The total thickness of the products used can be reduced.
[0075]
In other words, the external signal input terminal G is a gold-plated terminal on the pattern on the FPC, and the connection to the device is press-contacted by a spring connector. In this case, a spring connector is mounted on the back side of the liquid crystal display device. Therefore, the thickness of the apparatus itself was further increased by about 2 to 3 mm. On the other hand, as shown in FIG. 15, the external signal input terminal can be pulled out as a terminal that can be connected by the FPC connector 29, so that the thickness can be reduced.
[0076]
In the liquid crystal display device 12e shown in FIG. 16, the terminal lead-out portion has a refracting structure as compared with the liquid crystal display device 12d shown in FIG. 15, so that the terminal can be moved by bending or the like. The degree of freedom in designing the installation position of the connector increases.
[0077]
Next, the display device of the present invention will be described using a portable terminal.
A mobile phone 34 equipped with the liquid crystal display device 12 will be described with reference to FIG.
According to the mobile phone 34, the liquid crystal display device 12 is arranged in a small casing 35. In addition, a transmission / reception antenna 36 is provided on the top of the housing 35, and a receiver 37 and a microphone 38 are formed on the surface.
[0078]
A portable terminal 39 provided with the liquid crystal display device 12 will be described with reference to FIG. This mobile terminal 39 is shown as various information terminals other than the mobile phone 34. For example, there are clocks, calculators, game machines, pedometers, GPS, POS, handy terminals, industrial instruments, and the like, but are not limited to these. Also in this portable terminal 39, the liquid crystal display device 12 is disposed in a small housing 40.
[0079]
Thus, in the cellular phone 34 and the portable terminal 39, further miniaturization can be achieved by using the liquid crystal display device 12 which is miniaturized.
[0080]
In addition, the apparatus provided with the liquid crystal display device 12 of the present invention is exemplified by the mobile phone 34 and the mobile terminal 39, but can be applied to various devices using the liquid crystal display device 12 as a display device. For example, it may be used for display boards of various display devices such as sewing machines, stereos, musical instruments, videos, ATMs, copying machines, facsimiles, stations, restaurants, and display panels in factories.
[0081]
It should be noted that the present invention is not limited to the above-described embodiment, and various changes and improvements can be made without departing from the gist of the present invention.
[0082]
For example, in the above-described example, the light reflecting layer 19 is formed of a metal thin film made of Al, but a multilayer film made of a dielectric may be used instead to increase the reflectance.
[0083]
In this example, the reflection type liquid crystal display device for color display of the simple matrix type (STN) has been described. However, instead of this, a TN liquid crystal method, a TFT liquid crystal method, a ferroelectric liquid crystal method, an antiferroelectric material are used. Various reflection type liquid crystal display devices using a liquid crystal method and a bistable liquid crystal method may be used. Further, the light reflection layer 19 is formed of a transflective layer having both light reflectivity and light transmittance, Further, even if a transflective liquid crystal display device is provided by providing a backlight, the effects of the present invention are similarly obtained. In such a transflective liquid crystal display device, a backlight using EL, LED, or the like may be interposed between the liquid crystal display panel 13 and the FPC 16. In addition to the liquid crystal display device, the display device can be applied to an organic EL or a plasma display.
[0084]
【The invention's effect】
  As described above, according to the display device of the present invention,One substrate, the other substrate disposed opposite to the one substrate, and a flexible substrate provided so as to cover the outside of the one substrate and mounted with a driver IC, the other substrate being the other substrate A first electrode terminal along one side of the second substrate and a second electrode terminal along the other side of the other substrate, and the flexible substrate includes a first terminal and a second terminal, The one electrode terminal and the first terminal of the flexible substrate are electrically connected, and the second electrode terminal of the other substrate and the second terminal of the flexible substrate are electrically connected, and the first terminal A slit is formed in the flexible substrate located between the second terminalTherefore, the wiring pattern drawn around in the non-display area as in a display device such as a conventional liquid crystal display device becomes extremely small or unnecessary, and as a result, the wiring pattern becomes overcrowded and the display by expanding the non-display area The increase in size of the panel has been eliminated, and furthermore, unevenness in density due to the rounding of the voltage waveform applied to the electrodes in the display portion has not occurred, and the display quality has been improved.
[0085]
In addition, according to the present invention, since high-density wiring and a narrow frame of the display panel can be easily achieved as compared with the prior art, it is possible to increase manufacturing yield and mass productivity, thereby reducing manufacturing costs. As a result, a low-cost display device can be provided.
[0086]
In addition, in the present invention, the use of FPC can provide a display device that is both small and thin. In the display device of the present invention, if it is a liquid crystal display device, it is suitable for color display.
[0087]
Furthermore, according to the present invention, the terminal formed on the other transparent substrate and the terminal on the flexible circuit board are connected via the electrical connection means, whereby a signal is input from the driver IC. As a result, the number of connection points of each member is reduced, thereby simplifying the process. As a result, the production yield is improved and the production cost can be reduced.
[0088]
Further, in the display device of the present invention, by mounting the liquid crystal display device of the present invention, it is a portable terminal that achieves high quality and high reliability, low cost, miniaturization and thinning, and further a display device. Obtained.
[Brief description of the drawings]
FIG. 1 is a plan view of a reflective liquid crystal display device of the present invention viewed from the back side.
FIG. 2 is a cross-sectional view taken along a cutting plane line A-A ′ in FIG.
FIG. 3 is a cross-sectional view taken along a cutting plane line B-B ′ in FIG. 1;
FIG. 4 is a plan view showing a configuration of a transparent electrode of a liquid crystal display panel according to the present invention.
FIG. 5 is an enlarged cross-sectional view of a main part of a liquid crystal display panel according to the present invention.
FIG. 6 is a plan view of a conventional liquid crystal display device mounted with COF.
FIG. 7 is a plan view of a conventional TAB-mounted liquid crystal display device.
FIG. 8 is a plan view of a conventional COG-mounted liquid crystal display device.
FIG. 9 is a development plan view of a conventional liquid crystal display device.
FIG. 10 is a plan view of the back side of a conventional liquid crystal display device.
FIG. 11 is a cross-sectional view of a conventional liquid crystal display device.
FIG. 12 is a plan view of another reflective liquid crystal display device of the present invention viewed from the back side.
FIG. 13 is a plan view of another reflective liquid crystal display device of the present invention as viewed from the back side.
FIG. 14 is a plan view of another reflective liquid crystal display device of the present invention viewed from the back side.
FIG. 15 is a plan view of another reflective liquid crystal display device of the present invention viewed from the back side.
FIG. 16 is a plan view seen from the back side of another reflective liquid crystal display device of the present invention.
17A is a cross-sectional view taken along the section line AA ′ in FIG. 1 according to the liquid crystal display device of the present invention, and FIG. 17B is a cross-sectional view of a conventional COF-mounted liquid crystal display device with the same reference. FIG.
FIG. 18 is a front view of a mobile phone according to the present invention.
FIG. 19 is a front view of a mobile terminal according to the present invention.
[Explanation of symbols]
5a, 5b ... Driver IC for driving liquid crystal
12 ... Liquid crystal display device
13 ... Liquid crystal display panel
14 ... Signal side glass substrate
15 ... Scanning side glass substrate
16 ... FPC
17, 18 ... Transparent electrode pattern
19: Light reflecting layer
k ・ ・ ・ Circuit parts
G ... External signal input terminal
t1, t2 ... electrode terminals

Claims (3)

On the other hand,
The other substrate disposed opposite the one substrate;
A flexible substrate mounted on the outside of the one substrate and mounted with a driver IC;
The other substrate has a first electrode terminal along one side of the other substrate and a second electrode terminal along the other side of the other substrate;
The flexible substrate has a first terminal and a second terminal,
The first electrode terminal of the other substrate and the first terminal of the flexible substrate are electrically connected,
The second electrode terminal of the other substrate and the second terminal of the flexible substrate are electrically connected,
A display device , wherein a slit is formed in the flexible substrate positioned between the first terminal and the second terminal . The display device according to claim 1 , further comprising a liquid crystal layer interposed between the one substrate and the other substrate . Claim 1 or equipped with a display device according to 2, the display apparatus.

Images