KR20180131783A - Organic Light Emitting Diode display device and method of processing the compensation data of the OLED display device - Google Patents

Abstract

The present invention relates to an organic light emitting diode display device which stores display panel compensation data stored in an external memory in a memory embedded in a timing control circuit unit when a display panel or a timing control circuit unit is replaced in a manufacturing process or a repair process, and to a compensation data processing method of the organic light emitting diode display device. The organic light emitting diode display device comprises: a display panel which defines an intersection pixel of a plurality of gate lines and a plurality of data lines; a gate driving unit which supplies a plurality of gate signals to the gate lines; a data driving unit which supplies a data voltage to the data lines; and a timing control circuit unit which controls the gate driving unit and the data driving unit by using display panel compensation data stored in an embedded first memory. The timing control circuit unit reads compensation data matched with a display panel connected to the timing control circuit unit from the outside and stores the compensation data in the embedded first memory.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting diode (OLED) display device and an OLED display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting diode (OLED) display device and a compensation data processing method for an organic light emitting diode (OLED) display device, and more particularly, The present invention relates to an organic light emitting diode display device that stores data in a memory built in a timing control circuit portion, and a compensation data processing method of the organic light emitting diode display device.

The organic light emitting diode display device is a display device including an organic light emitting diode (OLED) as a self-luminous element in a pixel. The power consumption is lower and the thickness can be made thinner than that of a liquid crystal display device requiring a backlight. The organic light emitting diode display device has a wide viewing angle and a high response speed. Organic light emitting diode display devices are expanding their market by competing with liquid crystal display devices by developing process technology up to the level of large-scale mass production technology.

1 is a circuit diagram illustrating a pixel structure of an organic light emitting diode display device. Referring to FIG. 1, each pixel of the display panel includes a first switching TFT ST1, a second switching TFT ST2, a driving TFT DT, a capacitor Cst, and an organic light emitting diode OLED .

The first switching TFT ST1 is switched according to a scan signal (scan or gate signal) supplied to the gate line GL to supply the data voltage Vdata supplied to the data line DL to the driving TFT DT Supply.

The driving TFT DT is switched in accordance with the data voltage Vdata supplied from the first switching transistor ST1 to be supplied to the organic light emitting diode OLED from the first driving power supply VDD supplied to the power supply line PL Thereby controlling the data current Ioled.

The capacitor Cst is connected between the gate terminal and the source terminal of the driving TFT DT and stores a voltage corresponding to the data voltage Vdata supplied to the gate terminal of the driving TFT DT, DT) of the signal.

And a sensing signal line SL formed in the same direction as the gate line GL. And a second switching circuit for supplying a data current Ioled, which is switched according to a sense signal applied to the sensing signal line SL and supplied to the organic light emitting diode OLED, to an ADC (analog to digital converter) And a TFT ST2.

The organic light emitting diode OLED is electrically connected between the source terminal of the driving TFT DT and the cathode power supply VSS and emits light by the data current Ioled supplied from the driving TFT DT.

Each pixel of the organic light emitting diode display device has a data current Ioled flowing from the first driving power supply VDD to the organic light emitting diode OLED by switching the driving TFT DT according to the data voltage Vdata, And displays a predetermined image by emitting light to the organic light emitting diode OLED.

However, there is a problem that the threshold voltage (Vth) / mobility of the driving TFT (DT) and the characteristics of the organic light emitting diode (OLED) are different for each pixel depending on the non-uniformity of the manufacturing process of the TFT. Accordingly, in a typical organic light emitting diode display device, even if the same data voltage (Vdata) is applied to the driving TFT (DT) of each pixel, a uniform image quality can not be realized due to the deviation of the current flowing through the organic light emitting diode have.

In order to solve the problem of non-uniformity of the threshold voltage (Vth) / mobility of the driving TFT (DT) due to the manufacturing process variation and the characteristics of the organic light emitting diode (OLED), before driving of the organic light emitting diode display device, The threshold voltage (Vth) / mobility of the organic light emitting diode (DT) and the characteristics of the organic light emitting diode (OLED).

For this reason, increasing the stability of the device been the studies for compensating for the element changes accordingly proceeds, TFT and to initially receive less influence of V _TH driven for even Properties of the OLED to supply independent current into the pixel Current programming or digital compensation for small size.

The pixel compensation technique is divided into an internal compensation circuit and an external compensation circuit. The most widely applied voltage programming method of the internal compensation circuit is characterized in that the control of the driving (DR) TFT driving the current in the pixel is controlled by the voltage corresponding to the input image applied to the gate. This method is generally divided into a diode connection method and a source follower method in which the deviation of the V _TH of the DR TFT is sensed and compensated for.

2A shows a voltage programming type compensation circuit which has been developed for OLED displays, and solves the problem of luminance unevenness of the TFT panel. This circuit compensates the deviation of the driving TFT by adding a TFT, a capacitor and a control signal line. It consists of five TFTs and one capacitor and is implemented on an oxide semiconductor TFT substrate. FIG. 2B shows an operation timing diagram of the compensation circuit, and includes an initialization period I, a programming period II, and a light emission period III for compensation.

For a high-resolution panel, a simpler structure of compensation circuit is required, and a structure for switching the power supply to reduce the number of control circuits has been disclosed. Fig. 3 shows an internal compensation circuit of another configuration. This compensation circuit is composed of two TFTs and two capacitors, which has the merit of simple pixel structure and can compensate the mobility even though it is not perfect. Disadvantage is that switching power source (ELVDD) instead of decreasing the number of control circuits is difficult to apply in high resolution TV because it is difficult to switch power of large screen quickly and power consumption increases due to switching.

The external compensation circuit is a method in which a minimum pixel circuit is provided inside the panel and a circuit for compensating the driving TFT is placed outside the panel. Fig. 4 shows a simplified external compensation circuit. This circuit senses the characteristics of the driving TFT inside the panel in the external circuit to which the algorithm is applied, and performs the compensation operation in the data voltage application period in the external circuit. Advantages of such a compensation circuit include not only reducing the number of TFTs in the pixels within the panel but also reducing the number of driving signals, thereby simplifying the pixel structure and avoiding complication of timing, which is advantageous for high-speed driving. In addition, the reduction of the signal line due to the reduction of the switch TFT is advantageous in terms of the yield as compared with the internal compensation circuit. Various compensation functions can be applied through the programming of the algorithm of the external circuit part, so that V _TH , mobility and OLED voltage fluctuation of the driving TFT can be compensated.

In general, the external compensation circuit is implemented by a timing control circuit portion of the organic light emitting diode display device, and the compensation data necessary for external compensation is stored in a memory built in the timing control circuit portion.

A malfunction may occur in the timing control circuit or the display panel in the process of manufacturing the organic light emitting diode display device or in the process of using the organic light emitting diode display device. To solve this problem, the timing control circuit or the display panel must be replaced.

The external compensation data stored in the timing control circuit section is matched with the display panel module 1: 1. If a timing control circuit section storing data other than matched compensation data is used, a normal compensation operation is not performed. When a new timing control circuit unit is connected to an existing display panel or a new display panel is connected to an existing timing control circuit unit, an abnormal phenomenon occurs on the display screen.

Thus, when replacing with a new display panel or replacing with a new timing control circuit, new compensation data for external compensation must be stored in the memory connected to the timing control circuitry. In this case, since the new compensation data is stored in the memory of the timing control circuit part, it takes much time to sense and compensate the organic light emitting display device, resulting in a problem of low manufacturing efficiency or repair efficiency and cost.

The present invention provides an organic light emitting diode display device and a compensation data processing method using the organic light emitting diode display device that can reduce the time required to store external compensation data in a memory provided in a timing control circuit part when a display module or a timing control circuit part is replaced .

It is another object of the present invention to provide an organic light emitting diode display device capable of sharing a timing control circuit portion and a compensation data processing method using the same.

According to an aspect of the present invention, there is provided an organic light emitting diode display device including: a display panel defining intersecting pixels of a plurality of gate lines and a plurality of data lines; A gate driver for supplying a plurality of gate signals to the plurality of gate lines; A data driver for supplying a data voltage to the plurality of data lines; And a timing control circuit unit for controlling the gate driving unit and the data driving unit using display panel compensation data stored in a built-in first memory, wherein the timing control circuit unit comprises: And stores the compensation data in the built-in first memory.

The first memory of the organic light emitting diode display device according to the present invention may be any one of a NAND flash memory and a nonvolatile memory (ROM) including an EEPROM.

The organic light emitting diode display device according to an embodiment of the present invention may include a second memory that stores panel compensation data in a display module including a display panel and the timing control circuit unit may receive panel compensation data stored in the second memory And stores it in the first memory.

The organic light emitting diode display device according to another embodiment of the present invention is characterized in that the timing control circuit portion includes a first memory inserting portion and the timing control circuit portion receives the panel compensation data stored in the first external memory inserted in the first memory inserting portion And stores it in the first memory.

The organic light emitting diode display device according to another embodiment of the present invention may further include a second memory inserting part in a set part of the organic light emitting diode display device and the timing control circuit part may include a second memory inserting part inserted into the second memory inserting part, The panel compensation data stored in the external memory is read and stored in the first memory.

In the organic light emitting diode display device according to the present invention, when the first external memory is not inserted into the first memory inserting portion, the timing control circuit reads the Panner compensation data stored in the second external memory inserted in the second memory inserting portion And stores them in the first memory.

Preferably, the first external memory and the second external memory of the organic light emitting diode display device according to the exemplary embodiment of the present invention may be formed of any one of memory devices including USB and SD cards.

A method of processing compensation data of an organic light emitting diode display device according to the present invention includes the steps of: checking whether a memory storing a latest panel compensation data matched with a display panel connected to a timing control circuit is present; Reading panel compensation data from the memory; And storing the read panel compensation data in a first memory built in the timing control circuit unit.

A method of processing compensation data of an organic light emitting diode display device according to the present invention includes the steps of verifying whether a memory storing panel compensation data exists or not includes a second memory storing panel compensation data on a display panel ; Checking whether a first external memory is inserted in a first memory inserting unit included in the timing control circuit unit when the display panel does not include a second memory; And checking whether a second external memory is inserted in the second memory inserting unit included in the set unit of the organic light emitting diode display device when the first external memory is not inserted into the first memory inserting unit.

In a preferred embodiment of the compensation data processing method of the organic light emitting diode display device of the present invention, the timing control circuit part periodically backs up the panel compensation data to a memory storing the panel compensation data.

The organic light emitting diode display device and the compensation data processing method using the organic light emitting diode display device according to the present invention can exhibit the following effects.

First, when replacing the display module or the timing control circuit part, it is possible to reduce the time required to store the external compensation data in the memory provided in the timing control circuit part.

Second, the timing control circuit portion can be shared.

1 is a circuit diagram illustrating a pixel structure of an organic light emitting diode display device.
FIG. 2A is a configuration diagram showing an example of a voltage programming type internal compensation circuit, and FIG. 2B is an exemplary view showing an operation timing diagram of a compensation circuit.
Fig. 3 shows an internal compensation circuit of another configuration.
4 is an exemplary diagram showing a simplified external compensation circuit.
FIG. 5 is a diagram illustrating an exemplary configuration of an organic light emitting diode display device according to an exemplary embodiment of the present invention. Referring to FIG.
6 is an exemplary view showing a data processing method in the case of replacing the display panel module in the embodiment of FIG.
Fig. 7 is an exemplary diagram showing a data processing method in the case of replacing the timing control circuit portion in the embodiment of Fig. 5;
FIG. 8 is an exemplary view showing a schematic configuration of an organic light emitting diode display device according to a second embodiment of the present invention.
FIG. 9 is a schematic view illustrating an organic light emitting diode display device according to a third embodiment of the present invention. Referring to FIG.
10 is a flowchart illustrating a compensation data processing method of an organic light emitting diode display device according to an embodiment of the present invention.

For specific embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be embodied in various forms, And should not be construed as limited to the embodiments described.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises ", or" having ", and the like, are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be construed to indicate meaning consistent with the meaning of the context in the relevant art and are to be construed as either ideal or overly formal in meaning unless expressly defined in the present application Do not.

On the other hand, if an embodiment is otherwise feasible, the functions or operations specified in a particular block may occur differently than the order specified in the flowchart. For example, two consecutive blocks may actually be performed at substantially the same time, and depending on the associated function or operation, the blocks may be performed backwards.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The gist of the present invention is to read the compensation data matched to the display panel connected to the timing control circuit part from the outside and store it in the first memory built in the timing control circuit part. At this time, the external memory for storing the compensation data matched to the display panel may exist in various embodiments. In the following description, the case where a memory is present in the display panel module, the case where a memory inserted in the first external memory inserting part included in the timing control circuit part exists, and the case where a memory inserted in the second external memory inserting part included in the display set part Lt; / RTI > memory. These conditions may be carried out independently of each other, but it is to be noted that the merging can also be performed.

FIG. 5 is a diagram illustrating an exemplary configuration of an organic light emitting diode display device according to an exemplary embodiment of the present invention. Referring to FIG. One embodiment is a case where a memory is included in the display panel module. The timing control circuit unit 510 includes a timing controller IC 511 and a first memory 512. The display panel module 520 defines pixels at intersections of a plurality of gate lines and a plurality of data lines A display panel 522; A gate driver 523 for supplying a plurality of gate signals to the plurality of gate lines; A data driver 524 for supplying a data voltage to the plurality of data lines, and a second memory 521 for storing compensation data of the display panel 522. An abnormal operation may occur during the manufacturing process of the organic light emitting diode display device according to this embodiment or during use after the shipment, and the display panel module or the timing control circuit part may need to be replaced.

6 is an exemplary view schematically showing a compensation data processing method when the display panel is replaced. The timing control circuit unit 510 includes a timing controller IC 511 and a first memory 512 and a newly replaced display panel module 620 includes a second memory 621. In the second memory 621, compensation data of the replaced display panel is inputted. The timing controller IC 511 reads the compensation data stored in the second memory 621. The timing controller IC 511 stores the read compensation data in the built-in first memory 512. Accordingly, it is possible to prevent a screen abnormal phenomenon due to miss matching between the existing timing control circuit unit 510 and the newly-replaced display panel module 620.

7 is an exemplary view showing a method of processing compensation data using the organic light emitting diode display device when the timing control circuit part is replaced. The newly replaced timing control circuit (CPCB) 710 includes a timing controller IC 711 and a first memory 712 and a conventional display panel module 520 includes a second memory 521 . The second memory 521 receives compensation data of the display panel currently in use. Accordingly, the timing controller IC 711 incorporated in the newly replaced timing control circuit portion 710 reads the compensation data stored in the second memory 521. [ Then, the timing controller IC 711 stores the read compensation data in the first memory 712 built in the newly replaced timing control circuit portion 710. [ Accordingly, it is possible to prevent a screen abnormal phenomenon due to miss matching between the newly-replaced timing control circuit portion 710 and the display panel module 520.

FIG. 8 is an exemplary view showing a schematic configuration of an organic light emitting diode display device according to a second embodiment of the present invention. In the second embodiment, the timing controller 810 includes a timing controller IC 811, a first memory 812, and a first external memory inserter 813. The first external memory 814 may be inserted with the first external memory 814 storing the compensation data of the display panel of the currently connected display panel module 520. The timing controller IC 811 reads the display panel compensation data stored in the first external memory 814 inserted in the first external memory inserting unit 813 and stores the read data in the first memory 812.

FIG. 9 is a schematic view illustrating an organic light emitting diode display device according to a third embodiment of the present invention. Referring to FIG. In the third embodiment, the second external memory insertion portion 910 is included in the set portion 900 of the organic light emitting diode display device. A second external memory 911 storing the compensation data of the display panel currently connected to the second external memory 910 may be inserted into the second external memory 910. The timing control circuit unit 510 includes a timing controller IC 511 and a first memory 512. The timing controller IC 511 of the timing control circuit unit 510 reads the display panel compensation data from the second external memory 911 inserted in the second external memory inserting unit 910 of the display set unit 900. Then, the timing controller IC 511 stores the read-in display panel compensation data in the built-in first memory 512.

Meanwhile, as described above, the configurations according to the first to third embodiments may be configured independently of each other, or a mixed configuration is also possible. That is, a mixed configuration of the first embodiment and the second embodiment, a mixed configuration of the first embodiment and the third embodiment, or a configuration in which the second embodiment and the third embodiment are mixed may be possible. Further, embodiments in which all the constituent requirements according to the first to third embodiments are satisfied will also be possible. The first memories 512, 712, and 812 and / or the second memories 521 and 621 in the above-described embodiment may be any one of a NAND flash memory and a nonvolatile memory (ROM) including an EEPROM. In addition, the first external memory 814 and / or the second external memory 911 may be any one of a memory device including a USB and an SD card.

10 is a flowchart illustrating a compensation data processing method of an organic light emitting diode display device according to an embodiment of the present invention. This flow chart is for explaining a case where the configurations of the first to third embodiments are all included. Therefore, steps S101 to S103 can be selectively performed. That is, in the case of the configuration according to the first embodiment, steps S102 to S103 may be omitted, and when the configurations of the second and third embodiments are mixed, steps S102 to S103 are performed, and step S101 is omitted It will not be mentioned.

The timing controller IC of the timing control circuit unit checks whether there is a memory storing the latest panel compensation data matched to the connected display panel. First, it is checked whether a second memory storing the panel compensation data is included in the display panel module (S101).

If the second memory is included in the display panel module, step S104 is performed. When the display panel does not include the second memory, it is checked whether a first external memory is inserted in the first memory inserting unit included in the timing control circuit unit (S102).

If the first external memory is inserted into the first memory inserting portion, step S104 is performed. However, when the first external memory is not inserted into the first memory inserting unit, it is checked whether a second external memory is inserted into the second memory inserting unit included in the set unit of the organic light emitting diode display device (S103).

When the position of the memory storing the compensation data of the display panel is confirmed by performing the above-described steps S101 to S103 selectively, the timing controller IC reads the information stored in the memory (S104).

The timing controller IC stores the read compensation data of the display panel in the first memory in the timing control circuit unit (S105). Therefore, it is possible to prevent the occurrence of an abnormal operation due to miss matching between the compensation data stored in the timing control circuit and the display panel, and to generate compensation data when the timing control circuit or the display panel module is replaced Time can be reduced. In addition, the first memory of the timing control circuit portion can exhibit a subsidiary effect that can be shared.

In this manner, when the panel compensation data is stored in the first memory and normal driving is performed, the timing controller IC in the timing control circuit section is connected to the external memory, that is, the memory included in the display panel module, The compensation data is periodically backed up in a connected first external memory or a second external memory connected to the second external memory inserting unit of the display device set unit in step S106.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

510, 710, 810: Timing control circuit section 520, 620: Display panel module
511, 711 and 811: Timing controller ICs 512, 712 and 812:
521, 621: second memory 522: display panel
523: Gate driver 524: Data driver
813: first external memory inserting unit 814: first external memory
910: second external memory inserting unit 911: second external memory

Claims (12)

A display panel defining intersection pixels of a plurality of gate lines and a plurality of data lines;
A gate driver for supplying a plurality of gate signals to the plurality of gate lines;
A data driver for supplying a data voltage to the plurality of data lines;
And a timing control circuit unit controlling the gate driver and the data driver using display panel compensation data stored in a first memory, the organic light emitting diode display comprising:
Wherein the timing control circuit unit reads compensation data matched to a display panel connected to the timing control circuit unit from the outside and stores the compensation data in the built-in first memory. The method according to claim 1,
Wherein the first memory is one of a NAND flash memory and a nonvolatile memory (ROM) including an EEPROM. The method according to claim 1,
A display module including a display panel includes a second memory storing panel compensation data, and the timing control circuit reads the panel compensation data stored in the second memory and stores the read data in the first memory. A light emitting diode display device. The method according to claim 1,
Wherein the timing control circuit portion includes a first memory inserting portion and the timing control circuit portion reads the panel compensation data stored in the first external memory inserted in the first memory inserting portion and stores the read panel compensation data in the first memory. Organic light emitting diode display device. 5. The method of claim 4,
Wherein the first external memory is one of a memory device including a USB and an SD card. 5. The method of claim 4,
The organic light emitting diode display device according to claim 1, further comprising a second memory inserter in a set portion of the organic light emitting diode display device, wherein the timing control circuit portion reads panel compensation data stored in a second external memory inserted in the second memory inserter, The organic light emitting diode display device comprising: The method according to claim 6,
The timing control circuit unit reads the Panner compensation data stored in the second external memory inserted in the second memory inserting unit and stores it in the first memory when the first external memory is not inserted into the first memory inserting unit And the organic light emitting diode display device. The method according to claim 1,
The organic light emitting diode display device according to claim 1, wherein the organic light emitting diode display device includes a second memory inserting unit, and the timing control circuit unit reads the compensation data stored in the second external memory inserted in the second memory inserting unit and stores the compensation data in the first memory And an organic light emitting diode (OLED) display device. 9. The method according to any one of claims 6 to 8,
Wherein the second external memory is one of a memory device including a USB and an SD card. Confirming whether or not a memory storing the latest panel compensation data matched with the display panel connected to the timing control circuit unit is present;
Reading panel compensation data from the memory;
And storing the read panel compensation data in a first memory incorporated in a timing control circuit unit. The method of claim 10, wherein the step of verifying the presence or absence of the memory storing the panel compensation data comprises:
Determining whether the display panel includes a second memory storing panel compensation data;
Checking whether a first external memory is inserted in a first memory inserting unit included in the timing control circuit unit when the display panel does not include a second memory;
And checking whether a second external memory is inserted into the second memory inserting unit included in the set unit of the organic light emitting diode display device when the first external memory is not inserted into the first memory inserting unit Wherein the compensating data processing method of the organic light emitting diode display device comprises: 11. The organic light emitting diode display device according to claim 10, wherein the timing control circuit unit further comprises a step of back-up the panel compensation data to a memory periodically storing the panel compensation data. Way.

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