JP2000075316A - Liquid crystal display module and film carrier as well as portable terminal apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make luminance high and luminance unevenness less when a film carrier of a flex type is used. SOLUTION: This liquid crystal display module has a liquid crystal display panel 21, a substrate 25 which is arranged to face the liquid crystal display panel 21 and is packaged with a power source circuit 24, a light transmission plate 26 which is arranged between the liquid crystal display panel 21 and the substrate 25, a driver 22 for display and a driver 23 for scanning which drive the liquid crystal display panel by using the film carrier of the flex type connecting the respective electrodes of the liquid crystal display panel 21 and the substrate 25. A light source 27 is packaged in the flex wiring part of the film carrier 22a used for one of the driver 22 for display data and the driver 23 for scanning. A reflector 28 for concentrating light emission directions is formed in the flex resin part. The liquid crystal display module which allows the efficient incident of light on the opposite side end from the incident light end face of the light transmission plate 26 and has the high luminance and the lessened luminance unevenness may be provided at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display module with an edge light type backlight, a film carrier using a flex type film carrier, and a portable terminal device.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display module that is more easily viewable has been required for portable terminals and telephones, and the use of a liquid crystal display module with a backlight has been increasing in order to improve operability. Hereinafter, a configuration of a liquid crystal display module used in a portable terminal or the like will be described. FIG. 2 shows a configuration of a conventional liquid crystal display module. In FIG.
Reference numeral 11 denotes a liquid crystal display panel. Reference numeral 12 denotes a display data driver film carrier in a driving circuit for driving the liquid crystal display panel. Reference numeral 13 denotes a scanning driver film carrier. A power supply circuit 14 supplies a liquid crystal drive voltage to each driver. Reference numeral 15 denotes a printed circuit board on which a power supply circuit and the like are mounted. Reference numeral 16 denotes a light guide plate in an edge light type backlight. Reference numeral 17 denotes a backlight light source. 18 is a reflector.

The operation of the liquid crystal display module configured as described above will be described below. When the data read from the display memory is input to the liquid crystal display module, the display data driver applies a drive waveform according to the display data to the display electrode, and the scanning driver outputs one.
Display data is displayed on the liquid crystal display panel by applying a drive waveform to the scanning electrodes so as to scan line by line. The liquid crystal display panel and the driver are often connected by a film carrier, and mobile terminals and telephones require a particularly narrow frame, so a flex type with higher reliability in bending is sometimes used. Many.

[0004] In addition, in response to a demand for mounting a backlight to obtain a more easily viewable display, an edge-light type backlight using an LED light source is used in order to achieve both narrower frame and lower power consumption related to battery life. In recent years, the number of cases where a unit is used has been increasing. At this time,
An LED serving as a light source is often embedded in a light guide plate or surface mounted on a substrate.

[0005]

However, in the conventional liquid crystal display module, a reflector for concentrating the light emitting direction of the LED as the light source is merely arranged on the liquid crystal display panel display surface side. Since the light propagation direction B is shifted by 90 °, there is a problem that the efficiency is low and the surface luminance is low as a result. In order to solve this problem, there is a method of increasing the light emission luminance of the LED. However, there is a problem that the power consumption is increased due to an increase in the current value, or a problem is called through a reflector called “LED eyeball appearance”. There has been a problem that the LED light emitting portions are noticeably seen on the surface of the liquid crystal display panel.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned conventional problems. When a flex-type film carrier having a narrow frame is used, the brightness is high and the brightness is represented by "LED eyeball appearance". An object of the present invention is to provide a liquid crystal display module, a film carrier, and a portable terminal with less unevenness.

[0007]

In order to achieve this object, a liquid crystal module according to a first aspect of the present invention includes a liquid crystal display panel, a substrate having a power supply circuit mounted opposite to the liquid crystal display panel, and For display that drives the liquid crystal display panel using a light guide plate that is disposed between the liquid crystal display panel and the substrate and propagates light of the edge light type and a flex type film carrier that connects each electrode of the liquid crystal display panel and the substrate What is claimed is: 1. A liquid crystal display module comprising a driver and a scanning driver, wherein a light source is mounted on a film carrier used for one of a display data driver and a scanning driver. It is characterized in that it is formed outside the carrier.

As described above, the light source is mounted on the flex-type film carrier used for one of the display data driver and the scanning driver, and the reflector for integrating the light emitting directions of the light source is formed outside the film carrier. Therefore, light can be efficiently incident from the light incident end face of the light guide plate to the opposite end face. Also, compared to when the light source is embedded in the light guide plate or when it is surface-mounted on the substrate, the structure is completely covered by the reflector, so even a light source with low brightness can collect light efficiently and light leakage is reduced. Less, and the light collection efficiency increases. As a result, it is possible to provide a liquid crystal display module that has high luminance and does not cause luminance unevenness failure with low consumption and low cost.

According to a second aspect of the present invention, in the liquid crystal module according to the first aspect, the reflector is a resin having a reflecting function. As described above, the light collecting efficiency can be improved by using the reflector as a resin having a reflecting function. According to a third aspect of the present invention, in the liquid crystal module according to the first aspect, the reflector is an adhesive film having a reflection function. As described above, the light collecting efficiency can be increased by using the adhesive as the reflector having the reflecting function.

According to a fourth aspect of the present invention, there is provided a film carrier of a flex type connected between a liquid crystal display panel and a driver, wherein a light source is mounted on the flex wiring portion. In this manner, since the light source is mounted on the flex wiring portion of the film carrier, light can efficiently enter the light guide plate facing the light source from the light incident end surface to the opposite end surface in the mounted state. As a result, a liquid crystal display module with high luminance and less luminance unevenness can be realized at low cost.

According to a fifth aspect of the present invention, in the film carrier according to the fourth aspect, a resin having a reflection function is applied to a flex resin portion disposed outside the flex wiring portion.
As described above, since the resin having the reflecting function is applied to the flex resin portion disposed outside the flex wiring portion, the light source can be completely covered and hidden. For this reason,
There is no need to use a high-luminance light source, and low-consumption and low-luminance unevenness can be reduced.

According to a sixth aspect of the present invention, there is provided a film carrier according to the fourth aspect, wherein the flex type carrier is connected between the liquid crystal display panel and the driver, and the flex resin portion is disposed outside the flex wiring portion. An adhesive film having a reflecting function was attached to the substrate. As described above, since the adhesive film having the reflection function is attached to the flex resin portion disposed outside the flex wiring portion, it is not necessary to employ a high-brightness light source, as in claim 5. Brightness unevenness can be reduced with low consumption.

A portable terminal device according to a seventh aspect has the liquid crystal display module according to the first, second, or third aspect. As described above, since the liquid crystal display module according to the first, second or third aspect is provided, it is possible to achieve high luminance and reduce luminance unevenness while achieving both narrowing of the frame and low power consumption related to battery life. Becomes

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a conceptual diagram showing a configuration of a liquid crystal display module according to an embodiment of the present invention. In FIG. 1, reference numeral 21 denotes a liquid crystal display panel. Reference numeral 25 denotes a printed circuit board which is arranged opposite to the power supply circuit and the like, and reference numeral 26 denotes a light guide plate. The light guide plate 26 is disposed between the liquid crystal display panel 21 and the light guide plate 26, and propagates light of an edge light system. Reference numeral 22 denotes a display data driver of a driving circuit for driving the liquid crystal display panel, and reference numeral 23 denotes a scanning driver. Each electrode of the liquid crystal display panel 21 and the printed circuit board 25 is a flex-type film carrier 22a, 23
a. In the flex type film carrier 22a used for the display data driver 22, a backlight light source 27 is arranged in the flex wiring portion. In addition, a resin (reflector) 28 having a reflection function is applied to a flex resin portion disposed outside the flex wiring portion to converge the light emitting direction of the light source. A power supply circuit 24 supplies a liquid crystal drive voltage to each driver.

In the liquid crystal display module having the above configuration,
The operation will be described below. When the data read from the display memory is input to the liquid crystal display module,
The display data driver 22 applies a driving waveform according to the display data to the display electrodes, and the scanning driver 23 applies the driving waveform to the scanning electrodes so as to scan one line at a time. The display data is displayed. Further, as a backlight unit in the liquid crystal display module, a light source 27 mounted on a flex wiring portion of a flex type film carrier has 16 light sources.
LEDs of 08 size or less are the main. By mounting the light source 27 on the flex wiring portion, the light emission direction A and the light propagation direction B in the light guide plate 2 are the same direction, so that light can be efficiently incident from the light incident end surface of the light guide plate 26 to the opposite end surface.

On the other hand, in the conventional type in which an LED is mounted on a substrate, light cannot be efficiently incident on the end surface opposite to the light incident end surface of the light guide plate, and the direction is shifted by 90 °. The use of bright LEDs is required. A laterally illuminated LED is employed as a method for efficiently entering light. However, since this type of LED has the disadvantages of being large in size and expensive, the configuration of the embodiment of the present invention is not considered. By adopting it, scale down and cost reduction can be realized at the same time.

Further, by applying a resin having high reflection efficiency used as a reflector of the backlight to the flex resin portion, the back side of the light source 27 can be completely covered. The light-collecting efficiency is higher than that embedded in a substrate or a board-mounted type. Specifically, in the case where the conventional light source is embedded in the light guide plate, it is necessary to attach a reflective tape to all the end faces of the light guide plate so that there is no light leakage. In practice, however, there are many cases where the LED is attached only to the end face in the direction in which the LED emits light. Also, in the case of the board mounting type, since the laterally illuminated LED to be mounted does not irradiate 100% of the light in the horizontal direction, it is necessary to attach a reflection sheet for preventing light leakage to the display surface side of the liquid crystal display panel. is there. In any case, since the light source cannot be completely covered with the resin having the reflection function, the light-collecting efficiency is lower than that of the configuration of the embodiment of the present invention.
Therefore, by applying the LED to the flex wiring portion and the resin having high reflection efficiency to the flex resin portion as in the embodiment of the present invention, the LED as the light source can be completely covered and concealed. There is no need to use LEDs, and it is possible to reduce luminance unevenness such as "LED eyeball appearance" with low power consumption.

It should be noted that instead of applying a resin having high reflection efficiency to the flex resin portion, a film having high reflection efficiency can be used instead. At this time,
As a face to be stuck, sticking to the opposite side on which a light source such as an LED is mounted can prevent light leakage, so that the light collection efficiency increases. In this description, the light source and the reflector function are incorporated in the flex wiring portion and the resin portion of the film carrier of the display data driver. However, it goes without saying that the flex wiring portion and the resin portion of the film carrier of the scanning driver are used. There is no problem even if it is mounted on the unit.

[0019]

According to the liquid crystal display module of the present invention, the light source is mounted on the flex type film carrier used for one of the display data driver and the scanning driver, and the light emission of the light source is provided. Since the reflectors for consolidating the directions are formed outside the film carrier, light can efficiently enter the light guide plate from the light incident end surface to the opposite end surface. Also, compared to when the light source is embedded in the light guide plate or when it is surface-mounted on the substrate, the structure is completely covered by the reflector, so even a light source with low brightness can collect light efficiently and light leakage is reduced. Less, and the light collection efficiency increases. As a result, it is possible to provide a liquid crystal display module that has high luminance and does not cause luminance unevenness failure with low consumption and low cost.

According to the second aspect, the light-collecting efficiency can be increased by using a resin having a reflecting function for the reflector.
According to the third aspect, the light-collecting efficiency can be increased by forming the reflector as an adhesive film having a reflection function. According to the film carrier according to the fourth aspect of the present invention, since the light source is mounted on the flex wiring portion of the film carrier, the light can efficiently enter from the light incident end face of the light guide plate facing the light source to the opposite end face in the mounted state. Can light. As a result, a liquid crystal display module with high luminance and less luminance unevenness can be realized at low cost.

According to the fifth aspect, since the resin having a reflecting function is applied to the flex resin portion disposed outside the flex wiring portion, the light source can be completely covered. Therefore, it is not necessary to use a high-luminance light source, and it is possible to reduce luminance unevenness with low power consumption. According to the sixth aspect, since the adhesive resin film having a reflection function is attached to the flex resin portion disposed outside the flex wiring portion, it is not necessary to employ a high-luminance light source as in the fifth aspect. In addition, uneven brightness can be reduced with low consumption.

According to the portable terminal device described in claim 7 of the present invention, since the liquid crystal display module according to claim 1, 2, or 3 is provided, both narrowing of the frame and low power consumption related to battery life are compatible. In addition, it is possible to achieve high luminance and reduce luminance unevenness.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a liquid crystal cover module according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional liquid crystal display module used for a portable terminal device.

[Explanation of symbols]

11, 21 liquid crystal display panel 12 display data driver among the driving circuits for driving the conventional liquid crystal display panel 13 scanning driver among the driving circuits for driving the conventional liquid crystal display panel 14, 24 The liquid crystal driving voltage to each driver is Power supply circuit to be supplied 15, 25 Printed circuit board on which power supply circuit and the like are mounted 16, 26 Light guide plate in edge-light type backlight 17 Light source for backlight 18 Reflector 22 Display data of the drive circuit for driving the liquid crystal display panel of the present invention Driver 22a film carrier for display data driver 23 of the drive circuit for driving the liquid crystal display panel of the present invention scanning driver 23a film carrier for scanning driver 27 back provided in the flex wiring portion of the film carrier of the present invention For light Light source 28 Resin with high reflection efficiency applied to the flex resin portion of the film carrier of the present invention

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H089 KA17 QA16 TA03 TA07 TA10 TA18 UA09 2H091 FA14Z FA23Z FA41Z FA45Z FD03 FD06 GA13 GA14 LA18 LA30 MA10 2H092 GA45 GA50 GA51 GA59 NA26 PA12 PA13 RA10 5G435 AE02 AE03 BB12 FF03 FF08 GG23 LL07

Claims (7)

[Claims] 1. A liquid crystal display panel, a substrate disposed opposite to the liquid crystal display panel and having a power supply circuit mounted thereon, and a light guide plate disposed between the liquid crystal display panel and the substrate and propagating light of an edge light type. A liquid crystal display module comprising a display driver and a scanning driver for driving the liquid crystal display panel using a flex type film carrier connecting the liquid crystal display panel and each electrode of the substrate, wherein the display data A liquid crystal display module, wherein a light source is mounted on the film carrier used for one of the driver for scanning and the driver for scanning, and a reflector for integrating the light emitting directions of the light source is formed outside the film carrier. 2. The liquid crystal display module according to claim 1, wherein the reflector is a resin having a reflection function. 3. The liquid crystal display module according to claim 1, wherein the reflector is an adhesive film having a reflection function. 4. A flex type film carrier connected between a liquid crystal display panel and a driver,
A film carrier, wherein a light source is mounted on the flex wiring portion. 5. The film carrier according to claim 4, wherein a resin having a reflecting function is applied to a flex resin portion disposed outside the flex wiring portion. 6. The film carrier according to claim 4, wherein an adhesive film having a reflection function is attached to the flex resin portion disposed outside the flex wiring portion. 7. A portable terminal device comprising the liquid crystal display module according to claim 1, 2, or 3.