KR100590272B1 - Organic Electro Luminescence Device - Google Patents

Abstract

Disclosed is an organic electroluminescent device including a gamma correction unit and a photo sensor, which can adjust luminance in a user mode and an automatic mode. In the user mode operation, the organic light emitting device adjusts the brightness using the gamma correction unit, and in the automatic mode operation, the brightness is adjusted using the photo sensor.

Description

Organic Electro Luminescence Device             

1 is a block diagram schematically illustrating an organic light emitting device according to the related art.

2 is a block diagram schematically illustrating an organic light emitting display device according to a preferred embodiment of the present invention.

3 is a block diagram illustrating a gamma correction unit of an organic light emitting display device according to an exemplary embodiment of the present invention.

4A, 4B, and 4C are graphs showing luminance values according to gray level sections of a gamma correction unit in an organic light emitting diode display according to an exemplary embodiment of the present invention.

The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device having a gamma correction unit and a photo sensor to adjust luminance in a user mode or an automatic mode.

Recently, liquid crystal displays (LCDs) and organic light emitting diodes (OLEDs) are used in portable information devices due to their light weight and thinness. The organic light emitting device is attracting attention as a next-generation flat panel display because it has superior luminance and viewing angle characteristics as compared to the liquid crystal display.

Typically, in an active matrix organic light emitting device (AMOLED), one pixel includes R, G, and B unit pixels, and each R, G, and B unit pixel includes an EL element. Each EL element has an R, G, B organic light emitting layer interposed between the anode electrode and the cathode electrode to emit light from the R, G, B organic light emitting layer compared to the voltage applied to the anode electrode and the cathode electrode.

1 is a block diagram showing an organic light emitting device according to the prior art.

Referring to FIG. 1, the conventional organic light emitting diode device 100 includes a power supply unit 110, a memory unit SSRAM / ROM 120, a program unit FPGA 130, a buffer unit 140, and a driving unit. (Driver: 150) and panel (Panel: 160).

First, the power supply unit 110 receives source power from a power supply source, steps down, and divides the source power for each internal circuit to deliver a power voltage.

That is, the power supply unit 110 divides the source power into a memory unit 120, a program unit 130, a buffer unit 140, a driving unit 150, and a panel unit 160, and changes the source power to a power supply voltage. It is designed to deliver to the circuit.

Here, the embedded circuits are collectively named as the memory unit 120, the program unit 130, the buffer unit 140, the driving unit 150, and the panel unit 160.

Next, the memory unit 120 is composed of a RAM and a ROM, which stands for Ramdon Access Memory, also called a random access memory. When the power supply voltage is turned off, the stored contents are erased. In addition, ROM stands for Read Only Memory, which is a read-only memory, and its contents remain even when the power supply voltage is turned off. In particular, recently, as the data processing speed of the RAM continues to increase in the flat panel display 100, data stored in the memory unit 120 is quickly transferred to the program unit 130.

Next, the program unit (Field Programmable Gate Array) 130 receiving data from the memory unit 120 transmits a command signal and an address signal to the memory unit 120 according to program logic already implanted. signal). That is, the address of the memory unit 120 is designated according to the input command signal and the address signal, and data corresponding to the address is output to the program unit 130. Accordingly, the data received by the program unit 130 is processed by the program logic and transferred to the buffer unit 140.

Hereinafter, data processed and output according to the above-described process will be referred to as a program signal.

Next, the buffer unit 140 is a storage place for storing temporary information, and is used to compensate for a difference in time or information flow rate that occurs when the information is transmitted from one device to another. In addition, since the buffer unit 140 is a built-in circuit for making an address buffer for transmitting an address as a kind of register, the buffer unit 140 temporarily stores the program signal inputted from the program unit 130 to store the program signal. After compensating and adjusting the transmission time, the program signal is transmitted to the driver 150.

Next, the driver 150 amplifies the program signal input from the program unit 130 by using a driving transistor mounted on the driver 150. That is, the driver 150 extends the program signal and transmits the program signal to the panel 160 so that the organic light emitting diode of the panel 160 can be displayed smoothly.

Finally, the program signal amplified by the driving unit 150 is input to the organic light emitting element in the panel unit 160 and displayed.

Problems related to the conventional organic EL device related to the present invention and overcome by the present invention are as follows.

The organic light emitting device has a problem in that the organic light emitting device of the pixel unit emits light, and the light emission of the organic light emitting device is dispersed or dissipated by a light source generated in a surrounding environment.

In order to solve this problem, the gamma corrector and the photo sensor have to be designed such that the luminance of the organic light emitting device of the organic light emitting device is adjusted to a user mode and an automatic mode, respectively, according to a surrounding light source.

An object of the present invention is to provide an organic light emitting device having a gamma correction unit and a photo sensor, the brightness of which can be adjusted in a user mode and an automatic mode.

The present invention for achieving the above object, the program unit for generating a program signal for controlling the operation of the organic light emitting device according to a predetermined implanted program; An A / D converter converting an analog video signal into a digital video signal from the program unit and transferring the analog video signal; A memory unit for outputting the stored data to the program unit under the control of the program unit; A panel unit configured to display a predetermined screen using an organic light emitting diode according to the program signal and the digital image signal; A power supply unit for supplying power required for operation of the program unit, A / D converter, memory unit, and panel unit; A gamma correction unit disposed between the power supply unit and the panel unit to adjust luminance in a user mode; And a photo sensor connected to the A / D converter and recognizing a light source in the vicinity to adjust brightness in an automatic mode.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

Example

2 is a block diagram illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the organic light emitting device 200 includes a power supply unit 210, a gamma correction unit 220, a photosensor 230, a time signal generator 240, an A / D converter 250, and a program unit. (FPGA: 260), memory section (SSRAM / ROM: 270), buffer section (Buffer: 280), and panel section (Panel: 320).

The power supply unit 210 receives source power from a power supply source and divides the source power for each internal circuit to transfer a power voltage.

However, the embedded circuit may include the gamma correction unit 220, the photo sensor 230, the time signal generator 240, the A / D converter 250, the program unit 260, the memory unit 270, and the buffer unit ( 280 and the panel unit 320 are collectively named.

Therefore, the power supply unit 210 supplies a power supply voltage of 2.5V to the memory unit 270, and supplies a power supply voltage of 5V to the program unit 260. In addition, the power supply unit 210 supplies a power supply voltage of 3.3V to the buffer unit 280, applies a power supply voltage Vsel to the scan driver 290, and drives a data signal to the data driver 300. Apply Vdata, a power supply voltage, to drive. The panel unit 310 is applied with a power supply voltage Vdd and Vcat so that the organic light emitting diode emits light.

In addition, the power supply unit 210 selectively turns on / off the power supply voltages input to the gamma correction unit 220 and the photo sensor 230. That is, only one of the gamma corrector 220 and the photo sensor 230 receives the power voltage. Therefore, the power supply unit 210 operates only one circuit selected from the gamma correction unit 220 and the photo sensor 230.

Next, the memory unit 270 is composed of a RAM and a ROM. The RAM stands for Ramdon Access Memory and is also called a random access memory. When the power supply voltage is turned off, the stored contents are erased. In addition, ROM is an abbreviation of Read Only Memory, which is a read only memory, and its contents remain even when the power supply voltage is turned off. In particular, as the data processing speed of RAM continues to increase in the organic light emitting diode device 200, data stored in the memory unit 270 is quickly transferred to the program unit 260.

Next, the photo sensor 230 automatically recognizes illuminance which is brightness of light existing in the surrounding environment. That is, the illuminance recognized by the photo sensor 230, that is, the automatic recognition signal is input to the A / D converter and compared with the internally staged illuminance value. That is, the perceived illuminance is quantized to a level of two to six levels and converted into a digital automatic recognition signal.

Next, the A / D converter 250 is an internal circuit that converts an analog video signal into a digital video signal, and Vsync, Hsync, DE (Data Enable), and Dclk, which are analog video signals, convert the A / D converter 250. The digital image signal Vsync, Hsync, DE (Data Enable), and Dclk are input to the program unit 260. That is, the A / D converter 250 includes the Vsync for displaying the Y-axis which is the digital video signal converted from the analog video signal to the digital video signal, the Hsync for displaying the X-axis, and the DE for controlling the Vsync and Hsync. Transfer to section 260.

In addition, the A / D converter 250 receives the auto recognition signal received from the photo sensor 230, converts it into a digital auto recognition signal, and delivers it to the program unit 260.

Next, the program unit 260 receives the data transmitted from the memory unit 270 and the digital image signal and the digital auto recognition signal transmitted from the A / D converter 250. In addition, the program unit 260 applies a command signal and an address signal to the memory unit 270 according to the already implanted program logic. That is, the address of the memory unit 270 is designated according to the input command signal and the address signal, and data corresponding to the address is output to the program unit 260. Accordingly, the data, the digital image signal, and the digital auto recognition signal received by the program unit 260 are processed by the program logic and transferred to the buffer unit 280.

Hereinafter, data processed and output according to the above-described process will be referred to as a program signal.

Next, the buffer unit 280 is a storage place for storing temporary information and is used to compensate for a difference in time or information flow rate that occurs when transmitting information from one device to another. In addition, the buffer unit 280 is a built-in circuit for making an address buffer for transmitting an address as a kind of register. That is, the program signal, the digital video signal, and the digital auto recognition signal input from the program unit 260 are temporarily stored and adjusted in the buffer unit 280. Accordingly, the buffer unit 280 transmits the program signal, the digital image signal, and the digital auto recognition signal to the data driver 290 of the panel unit 330.

However, it should be noted that the buffer unit 280 is not an internal circuit that is essentially provided in the organic light emitting device 200.

Next, the time signal generator 240 generates the time control signal for controlling the program signal input from the data driver 290 and transmits the time control signal to the scan driver 300 of the panel 320.

Next, the gamma correction unit 220 is a built-in circuit for preventing the organic light emitting device of the pixel unit 310 from being darker or distorted than the amount of light, thereby increasing the emission rate of the organic light emitting device and improving stability. Is designed to maintain. In addition, the gamma correction unit 220 is provided in the organic light emitting device 200 to adjust the brightness of the organic light emitting device. That is, the luminance control signal of the gamma correction unit 280 is input to the data driver 290 divided into even and odd modes of the panel unit 320, and the organic light emitting diode is tuned to adjust the luminance freely.

Next, the panel unit 320 includes a pixel unit 310, a data driver 290, and a scan driver 300, and the pixel unit 310 includes an organic light emitting device therein. In addition, the data driver 290 is disposed in the horizontal direction and the scan driver 300 is disposed in the vertical direction around the pixel unit 310.

Here, when the data driver 290 is disposed in the vertical direction with respect to the pixel unit 310, the scan driver 300 may be disposed in the horizontal direction.

In addition, the data driver 290 drives the program signal and the digital image signal to the organic light emitting diode of the pixel unit 310. The scan driver 300 controls the program signal and the digital video signal by a time control signal. That is, the data driver 290 inputs the program signal and the digital image signal to the pixel unit 310 so that the organic light emitting diode of the pixel unit 310 emits light smoothly. The scan driver 300 transmits the time control signal to the organic light emitting diode of the pixel unit 310 to control the program signal and the digital image signal transmitted from the data driver 290. That is, the organic light emitting diode of the pixel unit 310 produces self-luminous desired by those skilled in the art.

In addition, only one signal of the digital automatic recognition signal and the brightness control signal is input to the data driver 290 according to the power supply voltage on / off of the power supply unit. That is, the data driver 290 inputs a signal selected from the digital automatic recognition signal and the luminance control signal to the organic light emitting diode of the pixel unit 310. Accordingly, the organic light emitting diode of the pixel unit 310 receives the selected signal, thereby causing the organic light emitting diode to be controlled in luminance in a user mode or an automatic mode.

Next, the organic light emitting device 200 according to the preferred embodiment of the present invention includes a photo sensor 230.

In general, the photo sensor 230 detects an object by using light such as infrared rays, and the light transmitting part and the light receiving part are separated, so that the transmissive type, the light transmitting part and the light receiving part coexist and detect an object through the reflector. There is a reflector type to detect and a direct reflection to check the object by detecting the amount of light hit the object and return.

The photo sensor 230 automatically recognizes illuminance which is brightness of light present in the surrounding environment.

The illuminance recognized by the photo sensor 230, that is, the automatic recognition signal is input to the A / D converter. The A / D converter compares and quantizes the automatic recognition signal with the internally staged illuminance value. That is, the recognized illuminance is quantized to a level of two to six levels, and the quantized value corresponding to the recognized illuminance becomes a digital automatic recognition signal.

3 is a block diagram illustrating a gamma correction unit of an organic light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a gamma correction unit of the organic light emitting device is shown. The gamma correction unit 220 includes a gamma corrector for each of R (Red), G (Green), and B (Blue). Each gamma corrector 400 includes a self selector 410, an amplitude adjustment register 420, a curve adjustment register 430, and a gray level amplifier 440 for each of R, G, and B. In addition, each of the R, G, and B self selectors 410 includes a 3-bit selector and a 7-bit selector internally connected to the amplitude adjusting register 420, respectively, and 4-bit internally connected to the curve adjusting register 430. It has a selector.

That is, the input voltage Vin applied from the power supply unit transfers the input voltage Vin to each of the R, G, and B gamma compensators 400 so as to selectively divide the voltages Vin, R, Vin, G, Vin, and B. The R, G, and B self selectors 410 of each of the R, G, and B gamma correctors 400 receive the selective division voltages. In addition, each of the R, G, and B self selectors 410 to which the selective division voltage is applied is connected to an amplitude control register 420 so that the 3-bit selector is provided inside the R, G, and B self selectors 410; By controlling the 7-bit selector, an amplitude adjustment luminance value for each gradation interval is generated. In addition, each of the R, G, B self-selector is connected to the amplitude control register 430 to control the 4-bit selector provided in the R, G, B self-selector 410, so that the amplitude adjustment luminance value curve Synthesize and convert to the adjusted luminance value.

Therefore, the curve adjustment luminance value is transmitted to each of the R, G, and B gray scale amplifiers 440. In addition, each of the R, G, and B gray scale amplifiers 440 amplifies the input curve adjustment luminance value to form output voltages Vout, R, Vout, G, Vout, and B in 64 sections, and among the 64 sections, A luminance control signal is generated to have a user mode set in steps 12 through 12. FIG. That is, the gamma correction unit 220 transmits the luminance control signal to the data driver of the panel unit.

4A, 4B, and 4C are graphs illustrating luminance values according to gray level sections of a gamma correction unit in an organic light emitting diode display according to an exemplary embodiment of the present invention.

Referring to FIG. 4A, a luminance value of each gray level interval is shown as a graph through a 3-bit selector connected to the amplitude adjusting register. That is, after the divided voltages Vin and R are input to the 3-bit selector and the luminance values appearing for each gray level section divided into eight sections are displayed as dots, the points are shown as lines. In addition, the graph of FIG. 4A changes the selection divided voltage Vin and R values three times, so that the points having luminance values for each gray level section are connected to form a line having three shapes.

Accordingly, it can be seen from the graph of FIG. 4A that the luminance value of the first section, which is the lowest section among the eight sections, is increased due to the change of the selection division voltage Vin and R.

Referring to FIG. 4B, a luminance value of each gray level interval is shown as a graph through a 7-bit selector connected to the amplitude adjusting register. That is, the selection division voltage Vin and R is input to the 7-bit selector, and only the 96 section is selected from the 128 sections that can be maximized by the 7-bit selector. In addition, the luminance value appearing for the gradation interval is represented by a point, and each point is successively shown by a line. In addition, the graph of FIG. 4B is changed so that the value of the divided voltage (Vin, R) is changed three times, so that the luminance values for each grayscale section are displayed to form a line having three shapes.

Accordingly, it can be seen from the graph of FIG. 4B that the fluctuation of the luminance value of the 96th section, which is the highest section among the 96 sections, is increased due to the change of the selection division voltage Vin and R.

Here, the 7-bit selector can be extended up to 128 sections.

Referring to FIG. 4C, a luminance value of each gray level interval is illustrated as a graph through a 4-bit selector connected to the curve adjusting register. That is, as can be seen from the graphs shown in FIGS. 4A and 4B, the disadvantage that the luminance value of the first section, which is the lowest section, is severely changed, and that the luminance value of the 96th section, which is the highest section, is severely fluctuated. Is supplemented by the control. Therefore, the curve adjustment register connected to the 4-bit selector controls the luminance values input to the 3-bit selector and the 7-bit selector so that the luminance values output through the 4-bit selector are divided into 16 sections.

However, the graph of FIG. 4C shows only points selected in four sections among the luminance values displayed in the section 16 in a line.

In addition, the graph of FIG. 4C illustrates that the selective divided voltage Vin and R values are changed three times to form a line having three shapes following points in which luminance values for each gray level are displayed.

Accordingly, as can be seen from the graph of FIG. 4C, the curve adjusting register controls the luminance value of the first section, which is the lowest section, and the luminance value of the 96th section, which is the highest section, so that the gamma correction unit can perform the user in six to twelve steps. It is designed to adjust the brightness manually manually.

Here, the curve adjustment register may be designed in a user mode in which a gradation interval is set up to 16 steps due to the 4-bit selector.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

According to the present invention described above, the organic light emitting device is designed by the gamma correction unit and the photo sensor to enable the brightness control in the user mode and automatic mode, thereby improving the luminous rate and stability of the organic light emitting device.

Claims (11)

A program unit for generating a program signal for controlling an operation of the organic light emitting device according to a predetermined implanted program; An A / D converter converting an analog video signal into a digital video signal from the program unit and transferring the analog video signal; A memory unit for outputting the stored data to the program unit under the control of the program unit; A panel unit configured to display a predetermined screen using an organic light emitting diode according to the program signal and the digital image signal; A power supply unit for supplying power required for operation of the program unit, A / D converter, memory unit, and panel unit; A gamma correction unit disposed between the power supply unit and the panel unit to adjust luminance in a user mode; And And a photo sensor connected to the A / D converter to adjust a luminance in an automatic mode by recognizing surrounding light sources. The organic light emitting device of claim 1, wherein the power supply unit turns on / off a power supply voltage to operate the user mode and the automatic mode complementarily. The organic light emitting device of claim 1, wherein the gamma correction unit adjusts luminance in a user mode having six to twelve steps. The method of claim 3, wherein the gamma correction unit, An R gamma corrector for performing gamma correction on the red signal; A G gamma corrector for performing gamma correction on the green signal; And An organic electroluminescent device comprising a B gamma corrector for performing gamma correction on a blue signal. The method of claim 4, wherein each of the R, G, B gamma correctors, An amplitude regulating register for varying an input voltage to adjust an amplitude of luminance; A curve adjusting register for controlling the shaking of the amplitudes of the highest and lowest sections of the gradation of the red, green, or blue signals; A self selector coupled to the amplitude regulating register and the curve regulating register, for selecting the most significant section and the least significant section and synthesizing them; And And a gradation amplifier receiving and amplifying a curve adjustment luminance value output through the self selector. The method of claim 5, wherein the self-selector, A 3-bit selector for selecting the highest range of the gray level; A 7-bit selector for selecting the lowest section of the gray level; And And a 4-bit selector for synthesizing the highest and lowest sections to generate the curve adjustment luminance value. The method of claim 1, wherein the organic light emitting device A buffer unit disposed between the program unit and the panel unit to temporarily store a program signal and a digital image signal output from the program unit; And a time signal generator disposed between the power supply unit and the panel unit to generate and transmit a time control signal to the panel unit. The method of claim 7, wherein the panel unit A pixel unit including an organic light emitting device; A data driver which receives a program signal and a digital image signal from the buffer and transmits the program signal and the digital image signal to the organic light emitting device; And And a scan driver configured to receive the time control signal and control a program signal and a digital image signal input to the organic light emitting diode. The organic light emitting device of claim 1, wherein the photo sensor has a reception level of two to six levels, and recognizes luminance in an automatic mode. The organic light emitting device of claim 9, wherein the photo sensor receives infrared rays. The method of claim 9, wherein the photosensor A transmissive type that separates the light transmitting part and the light receiving part and detects an object therebetween; A reflector type type, in which a light transmitting part and a light receiving part coexist and detect an object through a reflecting mirror; or An organic electroluminescent device, characterized in that the direct reflection type to check the object by detecting the amount of light hitting the object and return.

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