KR20080095423A - Hybrid image display apparatus and drive method thereof - Google Patents

Abstract

A hybrid image display device and a driving method thereof are provided to prevent unnecessary deterioration of an organic light-emitting diode by operating an organic electroluminescent panel for a main image and a liquid crystal panel for an auxiliary image individually. In the hybrid image display device, data lines cross inside the organic light-emitting diode display panel. The first timing controller rearranges and outputs first video data. First digital data is input to the first data driver through the first timing controller. First digital data is converted into the analog data voltage to form the first data line. The scan pulse is successively supplied to the first gate line through the control of the first timing controller.

Description

Hybrid image display apparatus and driving method thereof

1 is an exemplary view of a television receiver having a main screen and an auxiliary screen.

2 is a block diagram of a hybrid image display device according to an embodiment of the present invention.

FIG. 3 is an equivalent circuit diagram of each pixel of the organic light emitting diode display panel shown in FIG. 2.

FIG. 4 is an equivalent circuit diagram of each pixel of the liquid crystal display panel shown in FIG. 2.

Explanation of symbols on the main parts of the drawings

100: television receiver 200: video display device

210: organic light emitting diode display device 211: organic light emitting diode display panel

212: First timing controller 213: First data driver

214: first gate driver 220: liquid crystal display device

221: liquid crystal display panel 222: second data driver

223: second gate driver 224: second timing controller

225: backlight assembly 226: inverter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device such as a television receiver, and more particularly, to an organic light emitting diode display panel for displaying a broadcast image or various main images received from a television station, and a liquid crystal display panel for displaying an auxiliary image other than the broadcast image or the main image. It relates to a hybrid image display device having a and a driving method thereof.

In addition to the rapid development of science and technology, the multimedia field combining various forms of information such as video and audio has become a digital form of information storage and existence in the rapid development of information and communication. Due to the development of MPEG technology, which is a compression standard for moving picture data for compressing digital video data that requires relatively large amounts of data, the size of digital video data is gradually getting smaller. Digital video and audio services have been provided in all fields, and digital devices for providing such services have emerged.

Among them, video display devices such as television receivers have taken an important place as an easy and effective information transmission medium in daily life, and thanks to digital technology, video data and audio data are compressed and transmitted by MPEG technology, thereby adding a large amount of information. In addition to providing fast and stable, digital TV receivers make it easier to enjoy a wider variety of broadcasts at home with clearer picture quality and vivid sound.

As the function of a television receiver is advanced, a technology for dividing and driving a screen into two as a next generation broadcasting technology has been developed. In this case, as shown in FIG. 1, the television receiver 100 displays a broadcast image transmitted from a broadcasting station on a main screen, and displays an auxiliary image other than the broadcast image on an auxiliary screen. The display panel of the television receiver 100 may be implemented as a light emitting device using a backlight and a color filter or a self-light emitting device using an organic light emitting diode.

When the television receiver is implemented as a liquid crystal display device that is a light receiving device, there is a disadvantage in that the liveness of a video is lower than that of the organic light emitting diode display device which is a self-light emitting device. Therefore, researches are being actively conducted to apply an organic light emitting diode display device to a video display device such as a large television receiver as a next generation display device.

However, when an image display device having a main screen and an auxiliary screen is implemented as an organic light emitting diode display device as shown in FIG. 1, the image display device turns on the auxiliary surface when the broadcast image is displayed only through the main screen. By keeping it unnecessary, there is a problem that the organic light emitting diode included in each pixel of the auxiliary screen is deteriorated.

The present invention has been made to solve the above problems, and an object of the present invention is to display an organic light emitting diode display panel displaying a broadcast image or various main images received from a television station, and an auxiliary image other than the broadcast image or the main image. A hybrid image display device including a liquid crystal display panel to display and a driving method thereof are provided.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hybrid image display device capable of preventing unnecessary degradation of an organic light emitting diode by individually driving an organic light emitting diode display panel displaying a broadcast image or various main images and a liquid crystal display panel displaying an auxiliary image; It is to provide a driving method thereof.

Hybrid image display device according to the present invention for achieving the above object, the organic light emitting diode display device for displaying a broadcast image or a main image; And a liquid crystal display for displaying an auxiliary image.

The organic light emitting diode display device includes: an organic light emitting diode display panel formed by crossing a plurality of first gate lines and a plurality of first data lines; A first timing controller for rearranging first video data input from a system to output rearranged first digital data and to control driving of the first digital data; A first data driver converting the first digital data input through the first timing controller into an analog data voltage and supplying the first data line to the first data lines under the control of the first timing controller; And a first gate driver configured to sequentially supply scan pulses to the first gate lines under the control of the first timing controller.

The liquid crystal display includes: a liquid crystal display panel formed by crossing a plurality of second gate lines and a plurality of second data lines; A second timing controller for rearranging second video data input from the system to output rearranged second digital data and to control driving of the second digital data; A second data driver configured to convert the second digital data input through the second timing controller into an analog data voltage and supply the analog data voltage to the second data lines according to the control of the second timing controller; And a second gate driver configured to sequentially supply scan pulses to the second gate lines under the control of the second timing controller.

The organic light emitting diode display panel and the liquid crystal display panel are disposed on the same horizontal plane symmetrically from side to side, and one side thereof is in contact with each other.

The organic light emitting diode display panel has a larger area than the liquid crystal display panel.

A method of driving a hybrid image display device including an organic light emitting diode display panel and a liquid crystal display panel, the method comprising: displaying a broadcast image or a main image on the organic light emitting diode display panel; And displaying an auxiliary image on the liquid crystal display panel.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a block diagram of a hybrid image display device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the hybrid image display device 200 according to the present invention includes an organic light emitting diode display 210 that displays a broadcast image or various main images transmitted from a broadcasting station, and an auxiliary device other than the broadcast image and the main image. A liquid crystal display 220 for displaying an image is provided. The main image may include an image supplied from a computer main body, and the secondary image may include a still image for displaying a description of the operation of the image display apparatus 200.

The organic light emitting diode display 210 includes a plurality of data lines DL1 through DLm and a plurality of gate lines GL1 through GLn corresponding to each other, and a pixel including the organic light emitting diode OLED at an intersection thereof. The formed organic light emitting diode display panel 211, a first timing controller 212 for controlling the supply timing of the first video data input from the system, and a first digital input through the first timing controller 212. The organic light emitting diode display panel 211 under the control of the first data driver 213 and the first timing controller 212 for supplying data to the data lines DL1 to DLm of the organic light emitting diode display panel 211. And a first gate driver 214 for supplying scan pulses to the gate lines GL1 to GLn of FIG.

In the organic light emitting diode display panel 211, a plurality of data lines DL1 through DLm and gate lines GL1 through GLn cross each other. At this intersection, a pixel including an organic light emitting diode (OLED) is formed, and an equivalent circuit shown in FIG. 3 is formed in the pixel.

As illustrated in FIG. 3, each pixel formed in the organic light emitting diode display panel 211 is turned on by a scan pulse supplied through the gate line GL to switch the data voltage supplied through the data line DL. Turn-on by a switching transistor S_TR1, a storage capacitor Cst for charging a data voltage supplied through the switch transistor S_TR1, and a driving current supplied from a power terminal to which a high potential power voltage VDD is applied. Driven by the organic light emitting diode OLED and the data voltage supplied through the switch transistor S_TR1 or the charging voltage of the storage capacitor Cst, thereby driving the organic light emitting diode OLED. It is provided.

The switch transistor S_TR1 is an NMOS transistor having a gate connected to the gate line GL, a drain connected to the data line DL, and a source connected in common to the storage capacitor Cst and the gate of the driving transistor D_TR1. . The switch transistor S_TR1 is turned on by a scan pulse supplied through the gate line GL to supply a data voltage supplied through the data line DL to the gate of the storage capacitor Cst and the driving transistor D_TR1. .

One side of the storage capacitor Cst is commonly connected to the gates of the switch transistor S_TR1 and the driving transistor D_TR1, and the other side thereof is connected to ground, and is charged by the data voltage supplied through the switch transistor S_TR1. The storage capacitor Cst has its own data when the data voltage being supplied through the switch transistor S_TR1 is not applied to the gate of the driving transistor D_TR1, that is, when the data voltage is lowered to the gate voltage of the driving transistor D_TR1. The charging voltage is discharged to hold the gate voltage of the driving transistor D_TR1. Accordingly, the driving transistor D_TR1 is turned on by the charging voltage of the storage capacitor Cst during the holding period by the storage capacitor Cst even when the supply of the data voltage supplied through the switch transistor S_TR1 is stopped. do.

The organic light emitting diode OLED has an anode connected to a power supply terminal to which a high potential power supply voltage VDD is applied, and a cathode connected to a drain of the driving transistor D_TR1.

The driving transistor D_TR1 is an NMOS transistor having a source connected to the switch transistor S_TR1, a gate connected to the switch transistor S_TR1, a drain connected to the cathode of the organic light emitting diode OLED, and a source connected to ground. The driving transistor D_TR1 is turned on by the data voltage supplied to the gate through the switch transistor S_TR1 or the charging voltage of the switch transistor S_TR1 supplied to the gate, so that the driving current flowing through the organic light emitting diode OLED is grounded. By switching, the organic light emitting diode OLED is allowed to emit light by the driving current generated by the high potential power voltage VDD.

Meanwhile, each pixel of the organic light emitting diode display panel 211 is not limited to the equivalent circuit shown in FIG. 3.

The first timing controller 212 realigns the first video data input from a system such as a television receiver or a computer monitor to the arrangement type of each pixel of the organic light emitting diode display element 211 to rearrange the first digital data ( RGB data, RGBW data, etc.) are supplied to the first data driver 213. At this time, the first timing controller 212 uses the horizontal / vertical synchronization signals H and V from the system according to the clock signal CLK from the system, and the first data driving control signal DDC1 and the first gate drive. The control signal GDC1 is generated and supplied to the first data driver 213 and the first gate driver 214, respectively. Here, the first data drive control signal DDC1 includes a source shift clock SSC, a source start pulse SSP, a source output enable signal SOE, and the first gate drive control signal GDC1 is a gate. Start pulse (GSP), gate shift clock (GSC), gate output enable (GOE) and the like.

The first data driver 213 receives the first digital data input through the first timing controller 212 in response to the first data driving control signal DDC1 supplied from the first timing controller 212. DL1 to DLm). Here, the first data driver 213 samples and latches the first digital data supplied through the first timing controller 212, and then induces the first data driver 213 based on the gamma reference voltage supplied from the gamma reference voltage generator (not shown). The organic light emitting diode OLED of the light emitting diode display panel 211 is converted into an analog data voltage capable of expressing gray scale and supplied to the data lines DL1 to DLm.

The first gate driver 214 sequentially generates scan pulses and supplies them to the gate lines GL1 to GLn in response to the first gate driving control signal GDC1 supplied from the first timing controller 212.

The liquid crystal display device 220 includes a thin film transistor for driving the liquid crystal cell CLc at the intersection of a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn. TFT: Thin FiLm Transistor (LCD) formed thereon, second data driver 222 for supplying data to data lines DL1 to DLi of LCD panel 221, liquid crystal display panel ( Second timing controller for controlling the second gate driver 223 and the second data driver 222 and the second gate driver 223 for supplying the scan pulse to the gate lines GL1 to GLj of the gate 221. 224, a backlight assembly 225 for irradiating light to the liquid crystal display panel 221, and an inverter 226 for applying a driving voltage and a current to the backlight assembly 225.

In the liquid crystal display panel 221, liquid crystal is dropped between two glass substrates. The data lines DL1 to DLi and the gate lines GL1 to GLj are orthogonal to the lower glass substrate of the liquid crystal display panel 221. TFTs are formed at intersections of the data lines DL1 to DLi and the gate lines GL1 to GLj.

Each pixel formed in the liquid crystal display panel 221 has an equivalent circuit shown in FIG. 4.

As illustrated in FIG. 4, each pixel of the liquid crystal display panel 221 is turned on by a scan pulse supplied through the gate line GL, and a TFT for switching the data voltage on the data line DL, and a TFT. The liquid crystal cell CLc is driven by the data voltage supplied through the data voltage, and the storage capacitor Cst is used to charge the data voltage supplied through the TFT.

The TFT has a gate connected to the gate line GL, a drain connected to the data line DL, and a source commonly connected to the pixel electrode and the storage capacitor Cst. The liquid crystal cell CLc is formed between the pixel electrode and the common electrode.

The TFT is turned on in response to a scan pulse supplied to the gate terminal via the gate line GL connected to its gate terminal among the gate lines GL1 to GLj. During the turn-on of the TFT, the data voltage on the data line DL connected to the drain terminal of the TFT among the data lines DL1 to DLi is supplied to the pixel electrode of the liquid crystal cell CLc.

The common voltage Vcom is supplied to the common electrode of the liquid crystal cell CLc.

The storage capacitor Cst charges a data voltage applied from the data line DL when the TFT is turned on to maintain a constant voltage of the liquid crystal cell CLc.

When the scan pulse is applied to the gate line GL, the TFT is turned on to form a channel between the source electrode and the drain electrode so that the voltage on the data line DL is applied to the pixel electrode of the liquid crystal cell CLc. Supply. At this time, the liquid crystal molecules of the liquid crystal cell CLc modulate the incident light by changing the arrangement by the electric field between the pixel electrode and the common electrode.

In particular, the organic light emitting diode display panel 211 and the liquid crystal display panel 221 are disposed on the same horizontal plane symmetrically from side to side, and one side thereof is in contact with each other. The organic light emitting diode display panel 211 has a larger area than the liquid crystal display panel 221.

The second data driver 222 receives second digital data (RGB data, RGBW data, etc.) input through the timing controller 224 in response to the second data driving control signal DDC2 supplied from the second timing controller 224. ) Is supplied to the data lines DL1 to DLi. Here, the second data driver 222 samples and latches second digital data (such as RGB data or RGBW data) supplied from the second timing controller 224, and then supplies the second data driver 222 from a gamma reference voltage generator (not shown). The second digital data is converted into an analog data voltage capable of expressing gray scales in the liquid crystal cell CLc of the liquid crystal display panel 221 and supplied to the data lines DL1 to DLi based on the gamma reference voltage.

The second gate driver 223 sequentially generates scan pulses to supply the gate lines GL1 to GLj in response to the second gate driving control signal GDC2 supplied from the second timing controller 224. In this case, the second gate driver 223 determines the high level voltage and the low level voltage of the scan pulse according to the gate high voltage VGH and the gate low voltage VGL supplied from the gate driving voltage generator (not shown). do.

The second timing controller 224 rearranges the second video data supplied from the system to the arrangement type of each pixel of the liquid crystal display panel 221 to convert the rearranged second digital data (such as RGB data or RGBW data) into the second data. Supply to the driving unit 222. The second timing controller 224 uses the horizontal / vertical synchronization signals H and V from the system in response to the clock signal CLK from the system, and the second data driver control signal DDC2 and the second gate driver. The control signal GDC2 is generated and supplied to the second data driver 222 and the second gate driver 223, respectively. Here, the second data drive control signal DDC2 includes a source shift clock SSC, a source start pulse SSP, a polarity control signal POL, a source output enable signal SOE, and a second gate drive. The control signal GDC2 includes a gate shift clock GSC, a gate start pulse GSP, a gate output enable GOE, and the like.

The backlight assembly 225 is disposed on the rear surface of the liquid crystal display panel 221 and emits light by driving voltage and current supplied from the inverter 226 to irradiate light to each pixel of the liquid crystal display panel 221.

The inverter 226 converts a square wave signal generated therein into a triangular wave signal and compares the triangular wave signal with a DC power supply voltage VCC supplied from the system to generate a burst dimming signal proportional to the comparison result. When the burst dimming signal is generated, the driving IC (not shown) in the inverter 226 controls the generation of the driving voltage and current supplied to the backlight assembly 225 according to the burst dimming signal.

As described above, the hybrid image display device 200 according to the present invention individually drives the organic light emitting diode display panel displaying the broadcast image or the main image and the liquid crystal display panel displaying the auxiliary image. Even if an image is displayed on an organic light emitting diode display panel forming a main screen, deterioration of the liquid crystal display panel forming a sub screen does not occur. That is, the organic light emitting diode has a deterioration degree in proportion to the driving time, whereas the liquid crystal does not have a deterioration characteristic. Therefore, the present invention implements an auxiliary screen as a liquid crystal display panel, thereby displaying a broadcast image or a main image as a main screen. If it is displayed on the screen, deterioration of the auxiliary screen does not occur unnecessarily.

As described above, the present invention provides an organic light emitting diode display panel for displaying a broadcast image or various main images received from a television station, and a liquid crystal display panel for displaying an auxiliary image other than the broadcast image or the main image. It is possible to prevent unnecessary deterioration of the organic light emitting diode by separately attaching the organic light emitting diode display panel to the main screen and driving the liquid crystal display panel forming the auxiliary screen separately.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

Claims (6)

An organic light emitting diode display for displaying a broadcast image or a main image; And LCD display for displaying an auxiliary image Hybrid image display device comprising a. The method of claim 1, The organic light emitting diode display device, An organic light emitting diode display panel formed by crossing a plurality of first gate lines and a plurality of first data lines; A first timing controller for rearranging first video data input from a system to output rearranged first digital data and to control driving of the first digital data; A first data driver converting the first digital data input through the first timing controller into an analog data voltage and supplying the first data line to the first data lines under the control of the first timing controller; And A first gate driver sequentially supplying scan pulses to the first gate lines according to the control of the first timing controller Hybrid image display device comprising a. The method of claim 2, The liquid crystal display device, A liquid crystal display panel formed by crossing a plurality of second gate lines and a plurality of second data lines; A second timing controller for rearranging second video data input from the system to output rearranged second digital data and to control driving of the second digital data; A second data driver configured to convert the second digital data input through the second timing controller into an analog data voltage and supply the analog data voltage to the second data lines according to the control of the second timing controller; And A second gate driver configured to sequentially supply scan pulses to the second gate lines according to the control of the second timing controller Hybrid image display device comprising a. The method of claim 3, wherein And the organic light emitting diode display panel and the liquid crystal display panel are disposed on the same horizontal surface symmetrically from side to side, and have one side thereof in contact with each other. The method according to any one of claims 2 to 4, And the organic light emitting diode display panel has a larger area than the liquid crystal display panel. A driving method of a hybrid image display device comprising an organic light emitting diode display panel and a liquid crystal display panel, Displaying a broadcast image or a main image on the organic light emitting diode display panel; And Displaying an auxiliary image on the LCD panel Method of driving a hybrid image display device comprising a.

Images