JP4874209B2 - Liquid crystal display - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple matrix type liquid crystal display device in which a common driver IC is mounted face down, for example, a liquid crystal display in which a common transparent electrode group is divided into two and a display region is divided into two so that a drive voltage input is different. It relates to the improvement of the device.

  Such a simple matrix type liquid crystal display device will be described with reference to the drawings.

  1A is a plan view of the liquid crystal display device, FIG. 1B is a right side view thereof, and FIG. 1C is an upper side view thereof. FIG. 2 is a cross-sectional view taken along section line a-a ′ in FIG. 1A.

  According to this apparatus, a driver IC is a COG type liquid crystal display device in which one driver IC is mounted on the common side and three on the segment side are mounted face-down on the glass substrate. Use.

  A flip chip has bumps (electrodes) formed on its circuit surface, and the bumps are generally bonded to electrodes of a display panel via an anisotropic conductive sheet.

  Reference numeral 1 denotes a common-side glass substrate, and reference numeral 2 denotes a segment-side glass substrate. These glass substrates 1 and 2 are bonded together by a sealing resin 7 containing conductive particles 14 via a liquid crystal layer. Part 3 is formed.

  A common transparent electrode group 4 and an alignment film 17 are sequentially formed on the glass substrate 1, the common transparent electrode group 4 extends to the sealing resin 7, and energizes the glass substrate 2 through the conductive particles 14. It is a structure to let you.

  Further, the segment transparent electrode group 10 and the alignment film 15 are sequentially formed on the glass substrate 2. The segment transparent electrode group 10 is extended to the outside of the display unit 3 through the seal resin 7 to form a trapezoidal wiring pattern 8 (m pieces). These wiring patterns 8 are connected to the input wiring 9 through the segment driver IC 19.

  The common transparent electrode group 4 is energized with a trapezoidal wiring pattern 5 (n pieces) formed on the glass substrate 2 through the conductive particles 14, and this wiring pattern 5 includes a common driver IC 18 and its input wiring 6. And connected to.

  Reference numeral 20 denotes a substrate or a film provided with wiring for inputting power to the driver IC and various signals from the outside.

  However, according to the liquid crystal display device having the above configuration, the output system circuit of the liquid crystal applied voltage is divided into left and right inside the driver IC and the input terminals are independent or divided for the purpose of making the output multi-channel and slimming. In addition, when using a driver IC whose input terminals of the left and right output circuits are conductive but the wiring is thin and the resistance value is increased, density unevenness occurring between the display area X and Y is a problem. It was.

  This problem will be further described with reference to FIG.

  For example, when the display area (display area X and display area Y) is divided into two so that the common electrode group 4 is divided into two so that the drive voltage input is different, the common (scanning) side pixel of the liquid crystal display device The common driver IC 18 is used to drive the electrode, and the frequency of switching of the output voltage to the pixel electrode is as in a checkered pattern (white, black, white, black,... For each pixel in both the vertical and horizontal directions). When displaying large patterns with large current fluctuations, if there is a difference in resistance between the input terminals of the wiring from the power supply circuit for driving the liquid crystal to the input terminal for the liquid crystal applied voltage, these two inputs In the driver IC of nch output (the number of lines of the liquid crystal panel that can be driven by the driver IC, in which case the number of lines is n) in the driver IC, a difference occurs in the voltage at the terminal portion. 2nd A display screen portion corresponding to a difference in voltage applied to the n / 2 + 1 to n-th striking the display screen portion occurs, there is a problem that results in density unevenness for each block of the display area in the display state.

  FIG. 3 shows a state in which block spots are generated when a checkered pattern is displayed.

  Further, even if there is no difference in the resistance value of the wiring to each of the input terminals, the display screen portion corresponding to the 1st to n / 2th output terminals has a checkered pattern, and the display screen portion corresponding to the n / 2 + 1 to the nth display has a white background. When such a display is made, a difference occurs in the voltage at both input terminal portions due to a difference in current flowing through each input wiring, and similarly, density unevenness occurs in each block.

  Accordingly, an object of the present invention is to provide a liquid crystal display device that eliminates the occurrence of density unevenness in each display region as described above.

The liquid crystal display device according to the first aspect of the present invention, the one transparent substrate having a transparent electrode group for common is made form, together with the transparent electrode group for the segment is made form, the input common wiring pattern and the common The other transparent substrate on which the wiring, the segment wiring pattern, and the segment input wiring are formed; a common driver IC in which an input terminal is connected to the common input wiring and an output terminal is connected to the common wiring pattern; A segment driver IC whose input terminal is connected to the segment input wiring and whose output terminal is connected to the segment wiring pattern; a liquid crystal layer interposed between the one transparent substrate and the other transparent substrate; And the transparent electrode group for common and the transparent electrode group for segment intersect with each other through the liquid crystal layer so as to intersect in a plan view. The transparent substrate and the other transparent substrate, a liquid crystal display device formed by opposed, the number of terminals constituting the output terminal of said common driver IC is n (n is an even natural number), for the common An input terminal in the driver IC includes a first input terminal group for guiding a liquid crystal applied voltage for performing display corresponding to 1 to n / 2 of the output terminals of the common driver IC, and an internal terminal of the common driver IC. while being electrically connected to said first input terminal group, and a second input terminal group for guiding the liquid crystal application voltage to perform display corresponding to n / 2 + 1 to n-th output terminal of said common driver IC and which, wherein the first terminal constituting a terminal and the second input terminal group constituting the input terminal group, that is conducted through the connection wiring on the transparent substrate.

The liquid crystal display device according to the second aspect of the present invention, the one transparent substrate having a transparent electrode group for common is made form, together with the transparent electrode group for the segment is made form, the input common wiring pattern and the common The other transparent substrate on which the wiring, the segment wiring pattern, and the segment input wiring are formed; a common driver IC in which an input terminal is connected to the common input wiring and an output terminal is connected to the common wiring pattern; A segment driver IC whose input terminal is connected to the segment input wiring and whose output terminal is connected to the segment wiring pattern; a liquid crystal layer interposed between the one transparent substrate and the other transparent substrate; And the transparent electrode group for common and the transparent electrode group for segment intersect with each other through the liquid crystal layer so as to intersect in a plan view. The transparent substrate and the other transparent substrate, a liquid crystal display device formed by opposed, the number of terminals forming the output terminals of the driver IC for the segments is n (n is an even natural number), for the segments An input terminal in the driver IC includes a first input terminal group for guiding a liquid crystal applied voltage for performing display corresponding to 1 to n / 2 of the output terminals of the segment driver IC, and an internal part of the segment driver IC. while it is electrically connected to said first input terminal group, and a second input terminal group for guiding the liquid crystal application voltage to perform display corresponding to n / 2 + 1 to n-th output terminal of the driver IC for the segment And
Wherein the first terminal constituting a terminal and the second input terminal group constituting the input terminal group, that is conducted through the connection wiring on the transparent substrate.

  In the liquid crystal display device according to the first aspect and the second aspect of the present invention, it is preferable that the connection wiring is constituted by ITO or a laminate of ITO and aluminum metal.

  According to the liquid crystal display device of the present invention, one transparent substrate in which the common transparent electrode group and the alignment film are sequentially stacked, and the other transparent substrate in which the segment transparent electrode group and the alignment film are sequentially stacked are provided. The two transparent electrode groups are crossed to form a rectangular display area, and the common transparent electrode group is divided into two so that the drive voltage input is different. A common driver IC in which both common transparent electrode groups extend outside the display area, and terminals corresponding to both common transparent electrode groups are provided on the extended wiring patterns. The display area is divided into two parts so that the face-down mounting and wiring for energizing between the terminals are formed on a transparent substrate, or the segment transparent electrode group is divided into two and the drive voltage input is different. , Seg of both A segment driver IC that extends outside the display area, has a terminal corresponding to each of the segment transparent electrode groups, and is mounted face down on each of the extended wiring patterns; and When the nch output driver IC is used by forming the wiring for energizing the terminals on the transparent substrate, the display screen portion corresponding to 1 to n / 2 of the output terminals of the driver IC and n / 2 + 1 to n A liquid crystal display device in which the liquid crystal applied voltage, which is the power supply of the output voltage to the second display screen portion, is made equal at the left and right input terminals leading into the driver IC, and as a result, density unevenness for each block occurring in the display screen portion is eliminated Was able to provide.

  The liquid crystal display device of the present invention according to claim 1 will be described below.

  4A is a plan view of the liquid crystal display device, FIG. 4B is a right side view thereof, and FIG. 4C is an upper side view thereof. FIG. 5 is a cross-sectional view taken along section line a-a ′ in FIG. 4. The same parts as those of the liquid crystal display device shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  The display unit 3 is formed by bonding the common-side glass substrate 1 and the segment-side glass substrate 2 with a sealing resin 7 containing conductive particles 14 through a liquid crystal layer. This is a COG type liquid crystal display device in which one driver IC for driving is mounted on the common side and three on the segment side by flip chip. This flip chip has bumps (electrodes) formed on its circuit surface, and the bumps are generally bonded to the electrodes of the display panel via an anisotropic conductive sheet.

  More specifically, on the glass substrate 1, n common transparent electrode groups 4 made of ITO or the like arranged in a stripe shape, and an alignment film 17 made of polyimide synthetic resin or the like rubbed in a certain direction, Are formed sequentially. Further, the common transparent electrode group 4 extends to the seal resin 7 and is energized on the glass substrate 2 through the conductive particles 14.

  The common transparent electrode group 4 is energized with a trapezoidal wiring pattern 5 (n pieces) formed on the glass substrate 2 through the conductive particles 14, and the wiring pattern 5 includes a common driver IC 18 and its input wiring. 6 is connected.

  On the other hand, on the glass substrate 2, a segment transparent electrode group 10 made of ITO or the like arranged in stripes and an alignment film 15 made of polyimide synthetic resin or the like rubbed in a certain direction are sequentially formed. .

  The segment transparent electrode group 10 is extended to the outside of the display unit 3 through the seal resin 7 to form a trapezoidal wiring pattern 8 (m pieces). These wiring patterns 8 are connected to the input wiring 9 through the segment driver IC 19.

  Reference numeral 20 denotes a substrate or a film provided with wiring for inputting power to the driver IC and various signals from the outside.

  Further, spacers 16 for keeping the substrate gap constant are scattered between the alignment film 15 and the alignment film 17. There are m segment transparent electrode groups 10 and segment terminal groups 8 respectively, but they are omitted in the drawing.

  A sealing resin 7 containing conductive particles 14 is provided on the outer side of the display unit 3, and the glass substrate 1 and the glass substrate 2 are bonded together with the sealing resin 7, and the liquid crystal 12 is injected into the inner space thereof. 13 and injected with a sealing resin 7.

  As described above, the common-side wiring pattern 5 and the common transparent electrode group 4 are made conductive through the sealing resin 7 containing the conductive particles 14 so that the common-side wiring pattern 5 on the glass substrate 2 is placed on the glass substrate. Has been pulled out. Further, the segment transparent electrode group 10 is also connected to the wiring pattern 8 and the segment driver IC 19 through the seal resin 7, and thus connected to the flip chip (common driver IC 18 and segment driver IC 19), respectively.

  In this way, the input wiring 9 of the segment side driver IC is connected to the input terminal (drive voltage terminal) of the segment side driver IC 19, and the output terminal of the driver IC is a wiring made of ITO or a laminate of ITO and aluminum metal spreading like a fan. The pattern 8 is connected to the segment transparent electrode group 10 made of ITO. The input wiring 6 of the common side driver IC is also connected to the input terminal (drive voltage terminal) of the common side driver IC 18, and the output terminal of the driver IC is fan-shaped ITO (or a laminate of ITO and aluminum metal). The common transparent electrode group 4 made of ITO is connected through the wiring pattern 5 made of.

  And according to this invention, as shown in FIG. 6, about the input wiring 6 and the wiring pattern 5, on these extended wiring patterns 5 and 6, the terminal corresponding to both transparent electrode groups for common ( A wiring P that energizes the gap between the black rectangular bodies in FIG. 6 is formed on the glass substrate 2.

  That is, the potential difference between the left and right liquid crystal applied voltage input terminals corresponding to the power input portions of the first to n / 2th output terminals and the n / 2 + 1 to nth output terminals is eliminated. By eliminating the potential difference between the left and right input terminals for the liquid crystal applied voltage of the level, the occurrence of density unevenness for each display region as shown in FIG. 3 could be eliminated.

  Thus, according to the present invention, in a simple matrix type liquid crystal display device in which a driver IC is mounted on a glass substrate and input / output wiring of the driver IC is formed of ITO or a laminate of ITO and aluminum metal, With regard to wiring patterns, the output circuit is divided from the input terminal of the liquid crystal applied voltage on the left and right sides to make the output multi-channel and slim, and the internal wiring between the left and right input terminals is thin, the resistance value When a driver IC with a large current is used, the driver applies the liquid crystal applied voltage as the power supply for the output voltage to the 1st to n / 2th display screen portions of the driver IC's output terminals and the n / 2 + 1 to the 1st display screen portion. The left and right input terminals leading into the IC are internally divided (the drive voltage terminals arranged on the left and right sides of the driver IC are If the structure is not electrically connected), ITO or ITO and aluminum metal are laminated, and the conductor is electrically connected inside. Conduct on the substrate.

  That is, referring to the explanatory diagram of the driver IC shown in FIG. 7, the output system circuit is divided into left and right inside the driver IC and the input terminals are independent, or the input terminals of the divided left and right output system circuits are In the input wiring when using a driver IC having a large resistance value because the wiring is thin, (1) the display screen portion corresponding to the first to n / 2th output terminals of the driver IC and n / The left and right input terminals that lead the liquid crystal applied voltage, which is the power supply of the output voltage to the display screen portion corresponding to the 2 + 1 to nth, into the driver IC are internally divided (the drive voltage terminals arranged on the left and right sides of the driver IC are included therein) If the structure is not conductive, the conductive layer is made conductive on the substrate of the driver IC mounting portion with a wiring made of ITO or a laminate of ITO and aluminum metal. Also, (2) the left and right sides of the driver IC that lead the liquid crystal application voltage as the power source of the output voltage to the display screen portion corresponding to the 1st to n / 2th output screen and n / 2 + 1 to the 1st display screen portion of the driver IC into the driver IC. The input terminal is electrically connected inside, but the one having a high wiring resistance is made conductive on the substrate of the driver IC mounting portion with a wiring made of a laminate of ITO and aluminum metal.

  As a result, the potentials at the left and right input terminal portions of the liquid crystal applied voltage of each level are equalized, density unevenness for each block occurring in the display screen portion where the display operation is performed by the driver IC is eliminated, and good display is performed. I was able to.

  Incidentally, regarding the above driver IC, the TAB mounting driver IC often has the above-mentioned configuration, and when this driver IC is used for face-down mounting, density unevenness can be eliminated by using this wiring pattern. It is effective for.

  It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements can be made without departing from the scope of the present invention. For example, according to the above-described liquid crystal display device, the common transparent electrode group 4 and the common driver IC 18 have been described. However, the present invention can be applied to the segment transparent electrode group 10 and the segment driver IC 19 instead. Can be easily understood by those skilled in the art.

A is a plan view of a conventional liquid crystal display device, B is a right side view thereof, and C is an upper side view thereof. FIG. 1B is a cross-sectional view taken along section line a-a ′ in FIG. 1A. It is a top view which shows the example of block spot generation | occurrence | production at the time of a checkered pattern display. A is a plan view of the liquid crystal display device of the present invention, B is a right side view thereof, and C is an upper side view thereof. FIG. 4B is a cross-sectional view taken along section line a-a ′ in FIG. 4A. It is an enlarged view which shows the wiring pattern on the glass substrate of the driver IC mounting part which concerns on the liquid crystal display device of this invention. It is explanatory drawing which shows the structure of driver IC.

Explanation of symbols

1, 2 ... Glass substrate (transparent substrate)
DESCRIPTION OF SYMBOLS 3 ... Display part 4 ... Transparent electrode group 5 for common, 8 ... Wiring pattern 6 ... Common side driver IC input wiring 7 ... Seal resin 9 ... Segment side driver IC input wiring 10 ... Segment transparent electrode group 11 ... UV curable resin 12 ... Liquid crystal 13 ... Inlet 14 ... Conductive particles 15, 17 ... Alignment film 16 ... Spacer 18 ... Common Driver IC
19 ... Segment driver IC
20 ... Substrate or film with power supply to driver IC and wiring for inputting various signals from outside

Claims (3)

And one transparent substrate having a transparent electrode group for common is made form,
With transparent electrodes for the segment are made form the other transparent substrate and the common wiring pattern and the common input lines and segments wiring patterns and for segment input wiring is formed,
A common driver IC having an input terminal connected to the common input wiring and an output terminal connected to the common wiring pattern;
A segment driver IC having an input terminal connected to the segment input wiring and an output terminal connected to the segment wiring pattern;
A liquid crystal layer interposed between the one transparent substrate and the other transparent substrate,
A liquid crystal display device in which the one transparent substrate and the other transparent substrate are arranged to face each other through the liquid crystal layer so that the common transparent electrode group and the segment transparent electrode group intersect in a plan view; There,
The number of terminals constituting the output terminal of the common driver IC is n (n is an even natural number),
The input terminal of the common driver IC includes a first input terminal group for guiding a liquid crystal applied voltage for performing display corresponding to 1 to n / 2 of the output terminals of the common driver IC, and the common driver IC. A second input terminal group for conducting a liquid crystal applied voltage for performing display corresponding to n / 2 + 1 to nth of the output terminals of the common driver IC . Have
Wherein the first terminal constituting a terminal and the second input terminal group constituting the input terminal group, that is conducted through the connection wiring on the transparent substrate, a liquid crystal display device. And one transparent substrate having a transparent electrode group for common is made form,
With transparent electrodes for the segment are made form the other transparent substrate and the common wiring pattern and the common input lines and segments wiring patterns and for segment input wiring is formed,
A common driver IC having an input terminal connected to the common input wiring and an output terminal connected to the common wiring pattern;
A segment driver IC having an input terminal connected to the segment input wiring and an output terminal connected to the segment wiring pattern;
A liquid crystal layer interposed between the one transparent substrate and the other transparent substrate,
A liquid crystal display device in which the one transparent substrate and the other transparent substrate are arranged to face each other through the liquid crystal layer so that the common transparent electrode group and the segment transparent electrode group intersect in a plan view; There,
The number of terminals constituting the output terminal of the segment driver IC is n (n is an even natural number),
The input terminal in the segment driver IC includes a first input terminal group for guiding a liquid crystal applied voltage for performing display corresponding to 1 to n / 2 of the output terminals of the segment driver IC, and the segment driver IC. A second input terminal group for conducting a liquid crystal applied voltage for performing display corresponding to n / 2 + 1 to nth of the output terminals of the segment driver IC . Have
Wherein the first terminal constituting a terminal and the second input terminal group constituting the input terminal group, that is conducted through the connection wiring on the transparent substrate, a liquid crystal display device. The connection wire is constituted by lamination of ITO or ITO and aluminum metal, a liquid crystal display device according to claim 1 or 2.

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