KR100581802B1 - Organic light emitting display and information terminal having photo sensor - Google Patents

Abstract

The present invention relates to an organic light emitting display device and an information device that automatically adjusts luminance by using a photosensor whose output value is switched according to the illuminance of the surrounding environment. The organic light emitting diode display of the present invention outputs an analog signal corresponding to the detected light amount, a converter for converting the voltage of the analog signal into a digital voltage, and a data signal whose signal level is adjusted using the digital voltage. A data driver, a pixel portion displaying an image corresponding to the data signal, and light blocking means disposed on an optical path from the pixel portion to the photosensor and blocking light transmitted from the pixel portion to the photosensor.

OLED, display device, photo sensor, portable terminal, visibility, power consumption

Description

Organic light emitting display and information device having a photo sensor             

1 is a perspective view of a portable terminal having a conventional photosensor.

2 is a partial cross-sectional view of an example of a photosensor employed in the portable terminal of FIG. 1.

3 is a schematic plan view of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

4 is a block diagram of an organic light emitting display device according to a first embodiment of the present invention.

5A and 5B are schematic plan views of a modified example of the organic light emitting diode display according to the first embodiment of the present invention.

6 is a plan view of a photo sensor and a light blocking means of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

7 is a schematic partial cross-sectional view of a light blocking means of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

8 illustrates a gamma curve of the organic light emitting diode display according to the first embodiment of the present invention.

9 is a diagram of power consumption of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

10 is a perspective view of an information device having an organic light emitting display device according to a first embodiment of the present invention.

FIG. 11 is a block diagram of the information device of FIG. 10.

12 is a perspective view of a modification of an information device having an organic light emitting display device according to a first embodiment of the present invention.

<Description of the symbols in the main part of the drawing>

400, 700, and 830: organic light emitting display

410, 740, 818: pixel portion

420, 710, 810: photosensor

430, 750, 820: light blocking means

720, 812: A / D Converters

730, 814: data driver

760, 816: gamma adjuster

800: mobile terminal

The present invention relates to an organic light emitting display device and an information device having a photosensor.

In general, a flat panel display includes a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an organic light emitting display; OLED, etc., and has excellent characteristics such as thinning, light weight, and low power consumption. Such flat panel displays are display devices for various electronic devices such as mobile phones, personal digital assistants (PDAs), notebook computers, cameras, camcorders, etc., which are widely used by the general public in accordance with the development of electric, electronic, semiconductor, and information communication fields. As research and development.

Recently, TFT LCD displays using thin film transistors (hereinafter referred to as TFTs) have been used in various electronic information devices. Among them, portable information devices such as mobile phones, PDAs and PDA phones are equipped with various functions such as high resolution image display, high quality audio output, various memory functions, dictionary functions, recording functions, and shooting functions according to various demands of consumers. . Accordingly, today's electronic information devices require a low power consumption environment along with a large battery usage environment so that various functions can be used for a long time while being portable.

1 is a perspective view of a portable terminal having a conventional photosensor. 2 is a partial cross-sectional view of an example of a photo sensor employed in the portable terminal of FIG. 1.

Referring to FIG. 1, the mobile terminal 100 includes a liquid crystal display 104 and a photosensor 200 disposed in the first body 102. The liquid crystal display 104 basically consists of a liquid crystal panel 106 and a backlight (not shown). The mobile terminal 100 includes a liquid crystal display driver 108 for driving the liquid crystal display device 104. The liquid crystal display driver 108 is shown to be disposed inside the first body 102. The mobile terminal 100 includes an antenna, a second body 110 on which a radio frequency (RF) processor (not shown) and a baseband processor (not shown) are disposed. The first body 102 and the second body 110 are coupled on opposite sides. The baseband processor includes a processor (not shown) for controlling the entire portable terminal 100.

The photosensor 200 is formed of a complementary metal oxide semiconductor (CMOS) photosensor as shown in FIG. 2. The photosensor 200 includes a silicon substrate 202, a P-type well (w) 204 disposed on the silicon substrate 202, and an N-type region formed on the P-type well 204. 210, and an insulating layer 208 surrounding the N-type region 210. The N-type region 210 refers to a region doped with N-type impurities. A depletion region 206 formed by a PN junction is formed between the N-type region 210 and the P-type well 204. The insulating layer 208 is used to separate the N-type region 210 from other electrical elements to prevent shorting with other elements.

The conventional portable terminal 100 adjusts the brightness by selecting an appropriate brightness level for the backlight of the liquid crystal display device 104 according to the signal detected by the photosensor 200. For example, some or all of the backlights are turned on or turned off.

In recent years, an organic light emitting diode display using an organic light emitting diode is attracting attention as one of the next generation display devices. This is because the organic light emitting device emits light in all regions of visible light including blue, and has advantages such as high luminance and low operating voltage characteristics.

The organic light emitting device is a light emitting device, and emits light in proportion to a current flowing into the device. In addition, light emitted from the organic light emitting element is usually propagated in the radial direction. Therefore, when the photo sensor is mounted adjacent to the panel of the organic light emitting diode display using the conventional organic light emitting element, the photo sensor is affected by the light emitted from the pixel portion. For this reason, there is a problem that the illuminance detected by the photo sensor is inaccurate in the conventional organic light emitting display device in which the photo sensor is mounted adjacent to the pixel portion or in an information device equipped with the organic light emitting display device.

An object of the present invention is to provide an organic light emitting display device which automatically adjusts the brightness of an organic light emitting display device by using a photosensor in which a change in illuminance of the surrounding environment is more accurately detected.

Another object of the present invention is to provide an organic light emitting display device having greatly improved visibility by using a photosensor in which a change in illuminance of the surrounding environment is more accurately sensed, and an information device equipped with the organic light emitting display device.

It is still another object of the present invention to provide an organic light emitting display and an information device capable of reducing power consumption by preventing unnecessary power consumption of the display device by using a photosensor in which a change in illuminance of the surrounding environment is more accurately detected.

In order to achieve the above object, according to an aspect of the present invention, a photo sensor for outputting an analog signal corresponding to the amount of light detected, a converter for converting the analog signal into a digital signal, the level is adjusted in accordance with the digital signal A data driver for outputting the data signal, a pixel unit for displaying an image corresponding to the data signal, and a light blocking unit disposed on an optical path from the pixel unit to the photosensor and blocking light transmitted from the pixel unit to the photosensor. An organic light emitting display comprising means is provided.

In a preferred embodiment, the data driver adjusts the data signal by adjusting the level of the gamma curve step by step according to the digital signal.

The data signal includes a data voltage.

The gamma curve is a white gamma curve.

In addition, the gamma curve may include individual gamma curves of red, green, and blue.

The light blocking means is preferably formed to surround all or part of the side of the photosensor.

In addition, the light blocking means is preferably made of at least one material of metal, plastic, rubber.

The photosensor may be disposed on at least one of the upper portion, the side portion, and the lower portion of the pixel portion.

According to another aspect of the present invention, an image display unit comprising an organic light emitting display device having the above-described photo sensor and light blocking means, a memory for storing video information to be displayed on the image display unit, and a memory are coupled to the image display unit. An information device including a processor is provided.

According to still another aspect of the present invention, an image display unit comprising an organic light emitting display device having the above-described photo sensor and light blocking means, a memory for storing video information to be displayed on the image display unit, and a memory are combined to control the image display unit. There is provided an information apparatus including a baseband processor including a control unit, a high frequency processor connected to the baseband processor, and an antenna connected to the high frequency processor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein.

3 is a schematic plan view of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

Referring to FIG. 3, the organic light emitting diode display 400 includes a pixel portion 410, a photosensor 420, and a light blocking means 430. The pixel unit 410 basically includes a plurality of organic light emitting diodes (not shown) constituting each pixel or subpixel. The photosensor 420 may be located at the upper portion 420p of the pixel portion 410. Light emitted from the pixel portion 410 propagates in all directions including the direction in which the photosensor 420 is disposed.

The photosensor 420 detects external light and outputs a voltage value or a current value corresponding to the amount of light. The analog signal of the voltage or current output from the photosensor 420 is converted into a digital signal through an A / D converter, for example, as shown in FIG. 4 and then transmitted to the data driver.

The light blocking means 430 is positioned on an optical path from the pixel portion 410 to the photosensor 420 and is formed of a predetermined material and structure to prevent light of the pixel portion 410 from reaching the photosensor 420. do. In FIG. 3, the light blocking means 430 is formed to completely surround the photosensor 420. 3, the light blocking means 430 is briefly indicated by a dotted line.

As described above, the present invention uses the photosensor to automatically adjust the brightness of the organic light emitting diode display according to the surrounding environment so that the light emitted from the self-emission organic light emitting diode display does not affect the photosensor. According to the present invention, the photosensor can more accurately detect the change in the illuminance of the surrounding environment. Therefore, the brightness control of the organic light emitting display device having the photosensor is performed more accurately, thereby greatly improving the visibility of the organic light emitting display device.

In addition, the present invention is made so that the photosensor mounted on the organic light emitting display can more accurately detect the change in the illumination of the surrounding environment, thereby automatically reducing the brightness more accurately in the dark or indoors to reduce unnecessary power consumption of the display device Can be.

4 is a block diagram of an organic light emitting display device according to a first embodiment of the present invention.

Referring to FIG. 4, the OLED display 500 includes a photosensor 510, an analog-to-digital converter 520 (hereinafter referred to as an A / D converter), a data driver 530, a pixel unit 540, and Light blocking means 550. The light blocking means 550 refers to the light blocking means according to the first embodiment of the present invention, and is briefly indicated by a dotted line to surround the photo sensor 510. In the present embodiment, in order to avoid duplication of explanation, a detailed description of the light blocking means 550 will be described later and omitted in the present embodiment.

The photosensor 510 includes various types of sensors that can detect the ambient illumination. For example, the photo sensor 510 includes a charge coupling device, a charge injection device, a photomultiplier tube, a photodiode, a spectroradiometer, a CMOS optical device, and the like. The photosensor 510 senses the ambient brightness of the organic light emitting diode display 500. For example, the photosensor 510 outputs a voltage or current signal generated in the device by the incident light energy.

The A / D converter 520 receives an analog signal of current or voltage output from the photosensor 510 and converts the analog signal into a digital signal. The A / D converter 520 may be disposed in the photo sensor 510 or the data driver 530.

The data driver 530 uses the digital signal obtained from the A / D converter 520 to provide the pixel unit 540 with an appropriate data voltage corresponding to the peripheral illumination of the device. The data voltage output from the data driver 530 may be composed of individual data voltages of red, green, and blue. To this end, the data driver 530 includes a gamma adjuster 560. The gamma adjustor 560 includes a plurality of gamma curve levels corresponding to the illumination signal sensed by the photo sensor 510. The levels of the plurality of gamma curves correspond to the plurality of white levels or the black levels displayed on the pixel portion 740, respectively.

For example, as shown in Table 1 below, the data driver 530 increases or decreases the data voltage provided to the pixel unit 540 by using the data voltage setting value stored in the gamma control unit 560. .

Illuminance detected by photosensor Data voltage setting A One B 2 C 3

By the above-described configuration, the pixel portion 740 produces luminance suitable for the illuminance of the surrounding environment according to the data voltage of the data driver 530.

The pixel unit 540 may include a plurality of organic light emitting diodes and at least a scan driver. In this case, the data driver 530 and the scan driver may be formed to drive the pixel unit 540 in a matrix, and the data driver 530 may be disposed in the pixel unit 540. The plurality of organic light emitting diodes may be arranged in a matrix form, and the plurality of data lines and the plurality of scan lines may be disposed substantially vertically between the plurality of organic light emitting diodes. In addition, the data driver 530 may be configured to supply a data voltage to the pixel unit 540 or may be configured to supply a data current.

Next, the light blocking means of the present invention described above will be described in more detail with reference to FIGS. 5A, 5B, 6, and 7.

5A and 5B are schematic plan views of a modification of the organic light emitting diode display according to the first embodiment of the present invention. 6 is a plan view of a photo sensor and a light blocking means of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

Referring to FIG. 5A, the light blocking means 430 is formed in a wall shape that blocks the emitted light of the pixel portion 410 so that light emitted from the pixel portion 410 is not directly detected by the photosensor 420. . For example, the light blocking means 430 is formed to surround the photosensor 420 except for a specific portion of the photosensor 420 through which external light is input in the OLED display 400. The light blocking means 430 is formed of a metal material such as molybdenum tungsten and a material that does not transmit light emitted from the pixel portion 410 such as plastic and rubber.

In addition, the light blocking means 430 is formed to surround a portion of the photosensor 420 so that light emitted from the pixel portion 410 substantially does not affect the photosensor 420 as shown in FIG. 5B. Can be. In FIG. 5B, the photosensor 420 is formed in a quadrangular shape unlike in the case of FIG. 5A, and the light blocking means 430 is formed in a substantially '-' shape so as to correspond to the photosensor 420 having a quadrangular shape.

In addition, the photo sensor 420 and the light blocking means 430 may be simultaneously or selectively disposed on the side surface A or the lower portion B in addition to the upper portion of the pixel portion 410 as shown in FIG. 6.

7A, 7B, and 7C are schematic partial cross-sectional views of light blocking means of the organic light emitting diode display according to the first exemplary embodiment.

Referring to FIG. 7A, the OLED display 400 includes a light blocking block disposed between the pixel unit 410 and a photosensor 420 fixed on a supporting member 422 such as a printed circuit board. 430. The light blocking block 430 is fixedly disposed in the body 402 of the organic light emitting display 400. For example, the light blocking block 430 is interposed between the plurality of protrusions 402a protruding from the body 402 to be fixed to surround all or part of the side surfaces of the photosensor 420. The protrusion 402a may be attached to the body 402 as a separate member without being integrally formed with the body 402.

In addition, the light blocking block 430 may be integrally formed with the body 402 of the organic light emitting diode display 400 as illustrated in FIG. 7B. In this case, the light blocking block 430 extends between the pixel portion 410 and the photosensor 420 from the body 402 to surround all or part of the side surface of the photosensor 420.

In addition, as shown in FIG. 7C, the light blocking block 430 may be fixedly attached to the upper portion of the support member 422 on which the photosensor 420 is fixed by a predetermined adhesive 432. have. In this case, the light blocking block 430 may be prepared of a separate metal, plastic, or rubber material, and then may partially or partially cover the side surface of the photosensor 420 at an appropriate position between the pixel portion 410 and the photosensor 420. It is arranged to surround.

As described above, the present invention is configured to provide a corresponding data voltage to the pixel portion according to a detection signal of a photo sensor which can more accurately detect a change in illuminance of the surrounding environment by the light blocking means. Therefore, the visibility can be greatly improved in accordance with the change in the peripheral illuminance of the display device. Furthermore, since more precise brightness adjustment is possible, power consumption of the display device can be relatively reduced.

For example, as shown in Fig. 8, the present invention is configured such that the luminance according to the gamma curve A is displayed in the pixel portion in the dark place, and the luminance according to the gamma curve B is displayed in the pixel portion in the dark place. In particular, in adjusting the level of the gamma curve, the present invention utilizes a sensing signal of a photo sensor in which a change in illuminance of the surrounding environment is more accurately sensed. Therefore, according to the present invention, an organic light emitting display device in which luminance is more precisely and accurately adjusted can be provided. Furthermore, according to the present invention, as shown in FIG. 9, the luminance of the organic light emitting display is automatically adjusted as shown by the reference E using a photo sensor which more accurately senses a change in ambient illumination at night, in a dark place, or indoors. By adjusting to, the power consumption of the display device can be reduced by the hatched area C, as compared with the case where the luminance is not automatically adjusted as indicated by reference numeral D. FIG.

10 is a perspective view of an information device having an organic light emitting display device according to a first embodiment of the present invention. FIG. 11 is a block diagram of the information device of FIG. 10. 10 and 11, the information device is formed of a folding portable terminal.

10 and 11, the portable terminal 800 includes an organic light emitting display 830 having a photosensor 810 and a light blocking means 820, and an organic light emitting display 830 fixedly disposed. A first body 840, and a second body 850 coupled with the first body 840. The organic light emitting diode display 830 includes a photosensor 810, a light blocking means 820, an A / D converter 812, a data driver 814, and a pixel unit 818. The organic light emitting diode display 830 functions as an image display unit of the mobile terminal 800. The photosensor 810, the light blocking means 820, the A / D converter 812, and the pixel portion 818 are disposed in the first body 840. The data driver 814 is disposed on at least one of the first body 840 and the second body 850, and includes a gamma adjuster 816 that adjusts a gamma value according to a signal detected by the photosensor 810. do.

In addition, the portable terminal 800 includes a high frequency processor (RF unit) 860, an antenna 862, a baseband processor 860, and a power supply unit 880 mounted on the first body 840 or the second body 850. Include. The high frequency processor 860 is connected between the antenna 862 and the baseband processor 870, and processes the high frequency signal transmitted and received through the antenna 862. The baseband processor 870 includes a processor 872, a memory 874, and a peripheral device 876. The processor 872 processes stored information or transmitted / received information to be stored in the memory 874 or processed information is displayed on the screen of the organic light emitting display 830, or the processed information is output from a speaker (not shown). Be sure to As such, the processor 872 functions as a control unit for controlling the entire portable terminal 800. In addition, the processor 872 processes information input and output by the peripheral device 876 such as a keypad, a microphone, a camera, an infrared port, and a parallel port. The memory 874 stores video information to be displayed on the organic light emitting display 830.

In addition, as illustrated in FIG. 12, the portable terminal 800 may be formed as a foldable portable terminal including a double-sided organic light emitting display 930, a first body 940, and a second body 950. In this case, the double-sided organic light emitting diode display 930 may include one or two front or bottom emitting diode displays. In this case, the light blocking means 920 of the present invention may be formed to surround the photosensor 910 disposed on at least one of the upper side, the side portion, and the lower side of one side or both sides of the double-sided organic light emitting diode display 930. have. In FIG. 10, A and B denote lower and side portions of the double-sided organic light emitting display 930 in which the photosensor 910 and the light blocking means 920 may be formed.

As described above, the portable terminal according to the present invention includes light blocking means so that the photosensor disposed adjacent to the organic light emitting display is not affected by the organic light. With this arrangement, the present invention can improve the visibility of the display device mounted on the information device, and can automatically adjust the brightness of the display device more accurately to reduce the power consumption that can be consumed unnecessarily.

In the above-described embodiment, a folding portable terminal has been described as an example. However, it will be apparent to those skilled in the art that the present invention can be easily applied to PDAs, PDA phones, and the like.

As mentioned above, although the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the above embodiment, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. This is possible.

As described above, according to the present invention, the photo sensor disposed adjacent to the pixel portion by using the light blocking means is not affected by the light emitted from the panel, so that the detection signal of the photo sensor is more accurate to the change in the brightness of the surrounding environment. By adjusting the luminance of the organic light emitting diode display correspondingly, the visibility of the display apparatus can be greatly improved.

In addition, according to the present invention, in an information device equipped with an organic light emitting display and an organic light emitting display, the light blocking means is provided so that the emitted light of the pixel portion does not adversely affect the photosensor, thereby displaying the display according to the change in illuminance of the surrounding environment. In addition to automatically adjusting the brightness of the device, the more accurate brightness control can reduce the power consumption by lowering the brightness in the dark or indoors.

Claims (11)

A photosensor for outputting a detection signal corresponding to the detected amount of light; A data driver for outputting a data signal whose level is adjusted according to the detection signal; A pixel unit which displays an image corresponding to the data signal; And And light blocking means disposed on the optical path from the pixel portion to the photosensor and blocking light transmitted from the pixel portion to the photosensor. The method of claim 1, The data driver adjusts a data signal by adjusting a level of a gamma curve step by step according to the digital signal. The method of claim 1, And the data signal includes a data voltage representing the luminance of the pixel portion. The method of claim 2, The control of the gamma curve adjusts the ON voltage (white voltage) level. The method of claim 2, The gamma curve includes individual gamma curves of red, green, and blue. The method of claim 1, And the light blocking means is formed of at least one of metal, plastic, and rubber. The method of claim 1, And the light blocking means surrounds all or part of the side surface of the photosensor. The method of claim 1, The photo sensor is disposed on at least one of the upper portion, the side portion and the lower portion of the pixel portion. The method of claim 1, And an analog-to-digital converter for converting the analog sensing signal output from the photo sensor into a digital sensing signal and transferring the analog sensing signal to the data driver. An image display unit comprising an organic light emitting display device according to any one of claims 1 to 9; A memory for storing video information to be displayed on the image display unit; And And a processor coupled to the memory to control the image display. An image display unit comprising an organic light emitting display device according to any one of claims 1 to 9; A baseband processor including a memory for storing video information to be displayed on the image display unit and a processor coupled to the memory to control the image display unit; A high frequency processor connected to the baseband processor; And And an antenna connected to the high frequency processor.

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