KR20200067389A - Micro display device and method for controlling luminance thereof - Google Patents

Abstract

Embodiments of the present invention relate to a micro display device and a luminance control method. More specifically, embodiments of the present invention provide the micro display device capable of efficient luminance compensation and the luminance control method. In addition, according to an embodiment of the present invention, by configuring a luminance control circuit according to a temperature change inside an organic light emitting display module, the micro display device capable of compensating luminance with high speed and low power and the luminance control method can be provided. The micro display device comprises: a silicon substrate; a gate driving circuit; a data driving circuit; a controller; a temperature sensor; a power circuit; a data compensation circuit; and a voltage compensation circuit.

Description

MICRO DISPLAY DEVICE AND METHOD FOR CONTROLLING LUMINANCE THEREOF

The present invention relates to a micro display device and a luminance control method.

The display device includes a display panel in which a plurality of subpixels are arranged, and various driving circuits such as a source driving circuit and a gate driving circuit for driving the display panel. In such a display device, the display panel is formed with transistors, various electrodes, and various signal wires on a glass substrate, and driving circuits that can be implemented as integrated circuits are mounted on a printed circuit and electrically connected to the display panel through the printed circuit. Connected. However, this existing structure is suitable for a large display device, but not for a small display device.

On the other hand, a variety of electronic devices that require a small display device, such as a virtual reality (VR) device, augmented reality (Augmented Reality, AR) device, etc. are emerging, and accordingly, a micro display device that is manufactured very small It has been proposed.

The micro display device is formed of a semiconductor chip in the form of an integrated circuit (IC) on a silicon substrate (silicon semiconductor substrate), and various driving circuits as well as pixel arrays are often implemented in one piece.

At this time, as the micro display device is miniaturized, a circuit is implemented in a highly integrated form therein, thereby generating a lot of heat in the driving process. As such, when the temperature rises due to heat generated during the driving process, the panel of the micro display device is affected, and the luminance is deteriorated, and when the heat generation phenomenon continues, a problem occurs in that the life of the micro display device is deteriorated.

In order to compensate for the decrease in luminance, a method of disposing a temperature sensor on a silicon substrate, receiving a temperature value measured by the temperature sensor from an application processor, and supplying a luminance compensation value to a corresponding subpixel is used. However, since this method receives the temperature value sensed by the application processor and calculates the luminance compensation value, a time delay is inevitably generated until the luminance compensation for the corresponding subpixel is operated, and the operation of the application processor for calculating the luminance compensation value and There is a disadvantage that power consumption increases in the data processing process.

Accordingly, there is a need for a method for effectively performing luminance compensation according to a temperature change in a micro display device.

An object of an embodiment of the present invention is to provide a micro display device and a luminance control method capable of effective luminance compensation.

Another object of an embodiment of the present invention is to provide a micro display device and a luminance control method capable of compensating for luminance at high speed and low power by configuring a luminance control circuit according to a temperature change inside the organic light emitting display module.

In one aspect, a micro display device according to an exemplary embodiment of the present invention is disposed on one side of a pixel array and a silicon substrate including a pixel array in which a plurality of gate lines, a plurality of data lines, and a plurality of subpixels are arranged. A gate driving circuit for driving the gate line of the pixel, a data driving circuit disposed on the other side of the pixel array to drive a plurality of data lines, a gate driving circuit, and a controller for controlling signals applied to the data driving circuit; A temperature sensor disposed at one or more positions of the pixel array, a power supply circuit that supplies a voltage required to drive the subpixels arranged in the pixel array, and image data applied to the data driving circuit according to the temperature value sensed by the temperature sensor A data compensation circuit that generates gamma image data to be compensated and transmits it to the data driving circuit, and a voltage compensation circuit that generates and transmits a gamma voltage that compensates the voltage applied to the power circuit according to the temperature value sensed by the temperature sensor. It may include.

The micro display device may further include a selector for selecting one temperature value from the temperature values sensed by the temperature sensor.

The data compensation circuit includes a look-up table corresponding to a brightness compensation value according to a plurality of temperature values, a brightness compensation circuit outputting a brightness compensation value corresponding to a temperature value sensed by a temperature sensor, and a brightness provided by the brightness compensation circuit In order to compensate the image data applied to the data driving circuit according to the compensation value, a gamma compensation circuit that generates gamma image data may be included.

The brightness compensation circuit may be disposed inside the controller.

The look-up table may divide the distribution of temperature values into a plurality of regions having a predetermined range.

The voltage compensation circuit includes a look-up table corresponding to a gamma common voltage corresponding to a compensation value of the common voltage according to a plurality of temperature values, and transmits a gamma common voltage corresponding to the temperature value sensed by the temperature sensor to the power supply circuit. It may include a voltage compensation circuit.

The voltage compensation circuit includes a lookup table corresponding to a gamma driving voltage corresponding to a compensation value of the driving voltage according to a plurality of temperature values, and driving the gamma driving voltage corresponding to the temperature value sensed by the temperature sensor to the power supply circuit It may include a voltage compensation circuit.

The common voltage compensation circuit or the driving voltage compensation circuit can be disposed inside the controller.

In addition, the luminance compensation circuit of the micro display device according to an embodiment of the present invention includes a pixel array in which a plurality of subpixels are arranged, a gate driving circuit electrically connected to a pixel array through a plurality of gate lines, and a plurality of data lines. In a micro display device including a data driving circuit electrically connected to a pixel array and a power supply circuit supplying a voltage required to drive a subpixel, in the luminance compensation circuit for compensating the luminance of the pixel array according to temperature, A temperature sensor disposed at one or more positions of the pixel array, and a data compensation circuit that generates gamma image data that compensates for image data applied to the data driving circuit according to the temperature value sensed by the temperature sensor and transmits the gamma image data to the data driving circuit. , A voltage compensation circuit that generates a gamma voltage that compensates for a voltage applied to the power supply circuit according to the temperature value sensed by the temperature sensor and transmits the gamma voltage to the power supply circuit.

In addition, a luminance control method of a micro display device according to an exemplary embodiment of the present invention includes a pixel array in which a plurality of subpixels are arranged, a gate driving circuit electrically connected to a pixel array through a plurality of gate lines, and a plurality of data lines. A method for controlling luminance of a micro display device comprising a data driving circuit electrically connected to a pixel array and a power supply circuit supplying a voltage required to drive a subpixel, the temperature in a temperature sensor disposed at one or more locations in the pixel array Sensing, and compensating for generating gamma image data that compensates for image data applied to the data driving circuit according to the temperature value sensed by the temperature sensor and transmitting the gamma image data to the data driving circuit, and the temperature sensed by the temperature sensor. It may include a voltage compensation step of generating a gamma voltage for compensating the voltage applied to the power circuit according to the value and transmitting it to the power circuit.

The luminance control method of the micro display device may further include selecting one temperature value from the temperature values sensed by the temperature sensor.

The data compensation step includes a brightness compensation step of outputting a brightness compensation value corresponding to the temperature value sensed by the temperature sensor from a lookup table corresponding to the brightness compensation value according to a plurality of temperature values, and the data driving circuit according to the brightness compensation value. In order to compensate for the applied image data, a gamma compensation step of generating gamma image data may be included.

The voltage compensating step is a common voltage compensating step of transferring a gamma common voltage corresponding to the temperature value sensed by the temperature sensor to a power supply circuit from a lookup table corresponding to a gamma common voltage corresponding to the common voltage compensation value according to a plurality of temperature values. It may include.

In the voltage compensation step, a drive voltage compensation that transfers the gamma driving voltage corresponding to the temperature value sensed by the temperature sensor to the power supply circuit from a lookup table corresponding to the gamma driving voltage corresponding to the compensation value of the driving voltage according to the plurality of temperature values It may include steps.

According to the embodiment of the present invention as described above, it is possible to provide a micro display device and a luminance control method capable of effective luminance compensation.

In addition, according to an embodiment of the present invention, by configuring a luminance control circuit according to a temperature change inside the organic light emitting display module, it is possible to provide a micro display device and a luminance control method capable of compensating for luminance at high speed and low power.

1 is a view showing an example of an electronic device using a micro display device according to an embodiment of the present invention.
2 is a schematic system configuration diagram of a micro display device according to an embodiment of the present invention.
3 is a diagram illustrating a signal flow in which a compensation of image data is performed according to a temperature change of an organic light emitting display module in a micro display device.
4 is an exemplary diagram of a subpixel structure of a micro display device according to an embodiment of the present invention.
5 is an exemplary diagram of a subpixel structure of a micro display device according to another embodiment of the present invention.
6 is a view showing a system configuration of a micro display device according to an embodiment of the present invention.
7 is a block diagram showing a detailed configuration of a controller in a micro display device according to an embodiment of the present invention.
8A to 8C are diagrams illustrating examples of a lookup table stored in a brightness compensation circuit, a common voltage compensation circuit, and a driving voltage compensation circuit in a micro display device according to an embodiment of the present invention.
9 is a block diagram of a gamma compensation circuit in a micro display device according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims.

In addition, the shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. When'include','have','consist of', etc. mentioned in this specification are used, other parts may be added unless'~man' is used. When a component is expressed in singular, it may include a case in which plural is included unless specifically stated.

In addition, in interpreting the components in the embodiments of the present invention, it should be interpreted as including an error range even if there is no explicit description.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the essence, order, order, or number of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected to or connected to the other component, but different components between each component It will be understood that the "intervenes" may be, or each component may be "connected", "coupled" or "connected" through other components. In the case of the description of the positional relationship, for example, when the positional relationship of two parts is described as'~top','~upper','~bottom','~side', etc.,'right' Alternatively, one or more other parts may be located between the two parts unless'direct' is used.

In addition, components in the embodiments of the present invention are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be the second component within the technical spirit of the present invention.

In addition, the features (configurations) in the embodiments of the present invention may be partially or wholly combined with each other or combined or separated, and technically various interlocking and driving are possible, and each embodiment is independently performed with respect to each other. It could be possible or it could be done together in an association relationship.

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

1 shows an example of an electronic device using a micro display device according to an embodiment of the present invention.

Referring to FIG. 1, an electronic device 10 using a micro display device according to an embodiment of the present invention is a device of a head mounted display (HMD) type, which is a type of wearable device capable of displaying an image of augmented reality or virtual reality. Can be

In the present specification, the term “micro” may mean that the size of the micro display device is small, or may mean that the manufacturing process is made fine even if the size of the micro display device is not small.

The electronic device 10 includes an image signal input unit 11 through which image data is input, a first organic light emitting display device 12L on which a first image (eg, left-eye image) based on the image signal is displayed, and an image signal. A second organic light emitting display device 12R on which a second image (eg, right eye image) based is displayed, an image signal input unit 11, a first organic light emitting display device 12L, and a second organic light emitting display device 12R It may include a case 13 for storing.

The video signal input unit 11 may include a wired cable or a wireless communication module connected to a terminal (eg, a smart phone, etc.) for outputting image data. Although the video signal input unit 11 is shown as a wired line, the video signal input unit 11 may be implemented as a wireless interface.

The first organic light emitting display device 12L and the second organic light emitting display device 12R are organic light emitting display devices at positions corresponding to the user's left and right eyes. Each of the first organic light emitting display device 12L and the second organic light emitting display device 12R may include all or part of the micro display device. The first organic light emitting display device 12L, the second organic light emitting display device 12R, and a driving circuit for driving them may be referred to as an organic light emitting display device or an organic light emitting display module.

In the present invention, it is assumed that the first organic light emitting display device 12L and the second organic light emitting display device 12R are organic light emitting display devices implemented in a micro display type. However, the present invention is not limited to this.

2 is a schematic system configuration diagram of a micro display device according to an embodiment of the present invention.

Referring to FIG. 2, a micro display device according to an embodiment of the present invention may include an organic light emitting display module 100 and an application processor (AP) 200.

The organic light emitting display module 100 includes a pixel array PXA 110 including a plurality of subpixels SP arranged in a pixel array zone (PAZ) of a silicon substrate and a circuit zone (Circuit) of the silicon substrate. Zone, CZ) may be included.

The silicon substrate can be p-type or n-type. In this specification, "p" means a hole, and "n" means an electron. The silicon substrate may include a pixel array region (PAZ) and a circuit region (CZ). The circuit region CZ of the silicon substrate may be located around the pixel array region PAZ of the silicon substrate. For example, the circuit region CZ may exist on one side, two sides, or three sides of the pixel array region PAZ, or may surround the outer periphery of the pixel array region PAZ.

When a micro display device is used in the electronic device 10, a pixel array (e.g., a first organic light emitting display device 12L displaying a left eye image and a second organic light emitting display device 12R displaying a right eye image are separated) PXA) may be disposed 1:1 on a substrate separated from each other. In this case, the first organic light emitting display device 12L will be disposed on the substrate of the first organic light emitting display module, and the second organic light emitting display device 12R will be disposed on the substrate of the second organic light emitting display module. As another embodiment, the first organic light emitting display device 12L and the second organic light emitting display device 12R may be disposed at positions separated on one substrate. In this case, the first organic light emitting display device 12L and the second organic light emitting display device 12R will be separated on one organic light emitting display module 100. When the first organic light emitting display device 12L and the second organic light emitting display device 12R are separated, the data line DL, the gate line GL, and the pixel array PXA may be separated. Alternatively, even if the first organic light emitting display device 12L and the second organic light emitting display device 12R are separated, at least part of the driving circuit may be shared because they can be driven with the same driving signal system.

The driving circuit of the micro display device may include a gate driving circuit 120, a data driving circuit 130, and a controller 140. In addition, the gate driving circuit 120, the data driving circuit 130, the controller 140, and a power supply circuit (Power, 160) for supplying power required for driving the pixel array PXA may be further included.

The gate driving circuit 120 sequentially drives the plurality of gate lines GL by sequentially supplying the scan signal SCAN to the pixel array PXA through the plurality of gate lines GL. Here, the gate driving circuit 120 is also referred to as a scan driving circuit or a gate driving integrated circuit (GDIC: Gate Driver IC).

The gate driving circuit 120 sequentially supplies a scan signal SCAN of an on voltage or an off voltage to a plurality of gate lines GL under the control of the controller 140. To this end, the gate driving circuit 120 may include a shift register or a level shifter.

The gate driving circuit 120 may be located only on one side (eg, left or right) of the pixel array PXA, and in some cases, both sides of the pixel array PXA (eg, according to a driving method, a design method, etc.) (Left and right). Here, the case where the gate driving circuit 120 is located only on the left side of the pixel array PXA is illustrated.

The data driving circuit 130 receives image data from the controller 140 and supplies it to a plurality of data lines DL, thereby driving the plurality of data lines DL. Here, the data driving circuit 130 is also referred to as a source driving circuit or a source driving integrated circuit (SDIC).

When the specific gate line GL is opened by the gate driving circuit 120, the data driving circuit 130 converts the image data received from the controller 140 into an analog image data (VDATA) voltage to convert a plurality of data lines. (DL).

The data driving circuit 130 may be located only on one side (eg, an upper side or a lower side) of the pixel array PXA, and may be located on both sides (eg, an upper side and a lower side) of the pixel array PXA according to a driving method or a design method. It may be located. Here, as an example, a case where one data driving circuit 130 is disposed above the pixel array PXA is illustrated.

The data driving circuit 130 may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like. Here, the digital-to-analog converter (DAC) is a component for converting the image data received from the controller 140 to the image data (VDATA) voltage in the form of analog for supplying to the data line (DL).

The controller 140 applies a scan signal SCAN to the pixel array PXA according to the timing implemented in each frame, and a data signal format using the input image data input from the outside in the data driving circuit 130 It converts according to the output and outputs the converted image data (VDATA), and controls the data driving at a suitable time according to the scan signal (SCAN). The controller 140 may be a timing controller used in a conventional display technology or a control device that further performs other control functions including a timing controller.

The controller 140, the gate driving circuit 120, and the data driving circuit 130 may be collectively called a display driving IC (DDI).

In the pixel array PXA, a plurality of data lines DL and a plurality of gate lines GL intersect, and pixels or subpixels SP are arranged in a matrix form. The pixel array PXA includes a line for applying a common voltage VCOM commonly supplied to the subpixel SP, a driving voltage line DVL for supplying the driving voltage ELVDD to the plurality of subpixels SP, and A sensing line SL for sensing a characteristic value of the subpixel SP may be further included.

The pixel array PXA is composed of a plurality of pixels, and each pixel is divided into a red sub-pixel, a green sub-pixel, and a blue sub-pixel for color realization, and may further include a white sub-pixel. A wiring such as one data line DL, gate line GL, and driving voltage line DVL is connected to each subpixel SP.

In one frame period, the recording period in which the image data VDATA is applied to each sub-pixel SP is recorded, and the light emitted by the sub-pixel SP at a predetermined duty ratio according to the emission signal EM after the recording period is recorded. It can be divided into sections. In general, the emission signal EM emits the subpixel SP at a duty ratio of 50% or less during the emission period. Since the recording period is only about 1 horizontal period (1H), most of the 1 frame period corresponds to the light emission period.

The sub-pixel SP charges the image data VDATA in a capacitor in the recording section, and the sub-pixel SP repeats lighting and extinction according to the light emission signal EM. That is, the sub-pixel SP repeats on/off by emitting light at a constant duty ratio by repeatedly lighting and turning off within one frame period. As described above, the sub-pixel SP emits light after being turned off by the voltage charged in the capacitor, so that the data at the same luminance for one frame period at a constant duty ratio without receiving additional image data VDATA during the emission period even after the recording period Can be displayed.

The controller 140 receives input left-eye and right-eye image data and a timing signal synchronized thereto. The timing signal may include a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a clock signal (CLK), and a data enable signal (DE). The clock signal CLK may include a gate clock signal GCLK applied to the gate driving circuit and a source clock signal SCLK applied to the data driving circuit. The controller 140 sets the data timing control signal for controlling the operation timing of the data driving circuit 130 and the operation timing of the gate driving circuit 120 based on the timing signal and the DCS (Display Command Set) register setting value. A gate timing control signal for controlling is generated.

In addition, the power supply circuit for supplying various signals and voltages necessary for driving the subpixels SP arranged in the pixel array PXA to other circuits or supplying them to the pixel array PXA in the circuit region CZ of the silicon substrate. Power, 160). Here, the power circuit 160 may include a power generator such as a DC-DC converter, and generate and output a voltage required by the pixel array PXA from various power voltages supplied from the outside. . For example, the power circuit 160 may generate and output a driving voltage ELVDD, a common voltage VCOM, and a reference voltage VREF for driving the subpixel SP.

In addition, the circuit region CZ of the silicon substrate may include a temperature sensor 150 for sensing the temperature of the organic light emitting display module 100.

The temperature sensor 150 may be disposed at any position in the circuit region CZ of the organic light emitting display module 100, and one or a plurality of temperature sensors 150 may be disposed. The temperature value sensed by the temperature sensor 150 is transmitted to the application processor 200 through the controller 140, and the gamma image data (GDATA) compensated according to the temperature value sensed by the MCU 210 of the application processor 200. ) Is generated and transmitted to the controller 140, the corrected gamma image data GDAT may be supplied to the pixel array PXA through the data driving circuit 130.

Meanwhile, the memory MEM may be further included in the circuit region CZ of the silicon substrate. The memory MEM may temporarily store the image data VDATA output from the controller 140 and output the image data VDATA to the data driving circuit 130 at a designated timing. The memory MEM may be disposed inside or outside the data driving circuit 130, and when disposed outside the data driving circuit 130, the memory MEM may be disposed between the controller 140 and the data driving circuit 130. have. In addition, the memory MEM may further include a buffer memory that stores the externally received image data VDATA and supplies the stored image data VDATA to the controller 140.

In addition, the driving circuit disposed in the circuit region CZ of the silicon substrate may include an interface INF for signal input/output or communication with other external electronic devices or electronic components. The interface INF may include, for example, one or more of a Low-Voltage Differential Signaling (LVDS) interface, a Mobile Industry Processor Interface (MIPI), and a serial interface.

The application processor 200 may include an external memory (not shown in the drawing) and a micro control unit (MCU) 210 that can control the organic light emitting display module 100. The external memory may store image data to be displayed in the organic light emitting display module 100.

The application processor 200 may provide image data VDATA, control signals related to image data VDATA, and various clock signals CLK to a driving circuit of the organic light emitting display module 100, that is, DDI.

Meanwhile, the application processor 200 may further include a memory controller, a display controller, and a transmission interface in addition to the MCU 210. The MCU 210, the memory controller, and the display controller may communicate through a data line, and the memory controller may control external memory.

Meanwhile, driving circuits including transistors disposed in the pixel array region PAZ of the silicon substrate and transistors disposed in the circuit region CZ of the silicon substrate may be manufactured by the same process.

Accordingly, the micro display device may be formed in a silicon substrate by forming not only a pixel array (PXA), but also a data driving circuit 130, a gate driving circuit 120, and a controller 140, thereby miniaturizing the size of the device. In addition, the production process can be carried out easily and quickly. All or part of the micro display device may be made in a manufacturing process of a silicon wafer.

FIG. 3 is a diagram illustrating a signal flow in which a compensation of image data is performed according to a temperature change of an organic light emitting display module in a micro display device.

Referring to FIG. 3, the temperature sensor 150 disposed in the circuit region CZ of the organic light emitting display module 100 senses a temperature for a specific location of the organic light emitting display module 100 and senses the temperature value ( Tout) to the controller 140. At this time, the temperature sensor 150 may be disposed at any position in the circuit region CZ of the organic light emitting display module 100, and one or a plurality of temperature sensors 150 may be disposed.

The temperature value measured by the one or more temperature sensors 150 is transmitted to the MCU 210 of the application processor 200 through the controller 140. The MCU 210 calculates gamma data GDATA that compensates for the value of the image data VDATA according to the temperature value transmitted from the temperature sensor 150, and transmits the gamma data GDATA to the controller 140. The controller 140 supplies the gamma image data GDATA transmitted from the MCU 210 of the application processor 200 to the data driving circuit 130, and the corresponding subpixel SP according to the compensated gamma image data GDATA ).

At this time, in order to compensate for the decrease in luminance due to the temperature change of the organic light emitting display module 100, gamma image data GDATA, which is a compensation value for the image data VDATA, is generated by the MCU 210 of the application processor 200. In this case, not only does it take a lot of time to calculate the gamma image data (GDATA) value, but there is no choice but to generate a time delay until the gamma image data (GDATA) is supplied to the corresponding subpixel (SP). In addition, since the amount of data processed by the MCU 210 of the application processor 200 increases, power consumption increases during operation and data processing of the application processor 200. Particularly, there is a problem in that power consumption of the entire micro-display device is also increased in the process of transferring image data (VDATA) and gamma image data (GDATA) through the interface between the application processor 200 and the organic light emitting display module 100. Can occur.

4 is an exemplary diagram of a subpixel structure of a micro display device according to an embodiment of the present invention.

Referring to FIG. 4, in the micro display device, a plurality of subpixels SP are formed of an organic light emitting diode (OLED), a driving transistor (DRT) for driving the organic light emitting diode (OLED), and a driving transistor (DRT), respectively. A first transistor T1 electrically connected between the first node N1 which is a gate node and the data line DL, and a source node of the first node N1 and the driving transistor DRT of the driving transistor DRT, or A storage capacitor Cst electrically connected between the second node N2 which is the drain node may be included.

The organic light emitting diode (OLED) may be formed of a first electrode, an organic light emitting layer, and a second electrode, the first electrode may be an anode electrode (or cathode electrode), and the second electrode may be a cathode electrode (or anode electrode). The common voltage VCOM may be applied to the second electrode of the organic light emitting diode OLED. The common voltage VCOM may also be referred to as a ground voltage.

The driving transistor DRT is an electrical node and includes a first node N1, a second node N2, and a third node N3. The first node N1 of the driving transistor DRT corresponds to a gate node, and may be electrically connected to a source node or a drain node of the first transistor T1. The second node N2 of the driving transistor DRT corresponds to a source node or a drain node, and may be electrically connected to the first electrode of the organic light emitting diode OLED. The third node N3 of the driving transistor DRT is electrically connected to the driving voltage line DVL and the driving voltage ELVDD may be applied.

In the first transistor T1, the on-off is controlled because the scan signal SCAN is applied through the gate line GL, and the first node N1 of the data line DL and the driving transistor DRT is controlled. ). The drain node or the source node of the first transistor T1 may be electrically connected to the data line DL, and the source node or the drain node may be electrically connected to the first node N1 of the driving transistor DRT. When the first transistor T1 is turned on by the scan signal SCAN, the image data VDATA supplied from the data line DL is transmitted to the first node N1 of the driving transistor DRT. .

5 is an exemplary diagram of a subpixel structure of a micro display device according to another embodiment of the present invention.

Referring to FIG. 5, each subpixel SP of the micro display device further includes a second transistor T2 electrically connected between the second node N2 of the driving transistor DRT and the sensing line SL. Can be.

The gate node of the second transistor T2 may be electrically connected to the gate line GL, the drain node or source node may be electrically connected to the sensing line SL, and the source node or drain node may be a driving transistor (DRT). ) May be electrically connected to the second node N2.

On-off of the second transistor T2 may be controlled by a scan signal SCAN applied to the gate node. The gate node of the first transistor T1 and the gate node of the second transistor T2 are electrically connected to each other, and may be commonly connected to one gate line GL. In this case, the gate node of the first transistor T1 and the gate node of the second transistor T2 may receive the scan signal SCAN together.

Alternatively, the gate node of the first transistor T1 and the gate node of the second transistor T2 may be separately connected to different gate lines GL. In this case, the scan signal SCAN may be individually applied to the gate node of the first transistor T1 and the gate node of the second transistor T2.

When the second transistor T2 is turned on, the reference voltage VREF may be applied to the second node N2 of the driving transistor DRT, and when the second transistor T2 is turned off, The second node N2 of the driving transistor DRT may be electrically floated. As described above, the voltage state of the second node N2 of the driving transistor DRT may be controlled according to the driving type and driving situation through the second transistor T2 and the sensing line SL.

Each of the driving transistor DRT, the first transistor T1, and the second transistor T2 may be an n-type or p-type transistor. The storage capacitor Cst is not a parasitic capacitor (eg, Cgs, Cgd), which is an internal capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT, but is not a driving transistor. It is an external capacitor designed intentionally outside of (DRT).

Meanwhile, the pixel array PXA disposed in the pixel array region PAZ of the silicon substrate and the driving circuits disposed in the circuit region CZ of the silicon substrate may be manufactured by the same process. In this case, the current-voltage transfer characteristics (transistor performance or transistor characteristics) of the transistor located in the pixel array region (PAZ) of the silicon substrate, and the current-voltage transfer characteristics of the transistor located in the circuit region (CZ) of the silicon substrate ( Transistor performance or transistor characteristics) may be the same or substantially the same.

6 is a view showing a system configuration of a micro display device according to an embodiment of the present invention.

Referring to FIG. 6, the micro display device according to an exemplary embodiment of the present invention may perform luminance compensation according to temperature sensing in the DDI in the circuit region CZ of the organic light emitting display module 100 including the controller 140. Make up. Therefore, since the luminance compensation value according to the temperature is not calculated through the MCU 210 of the application processor 200, the calculation processing speed for luminance compensation can be improved and power consumption can be reduced.

In the micro display device of the present invention, the organic light emitting display module 100 includes a plurality of pixel arrays PXA and circuit regions CZ including a plurality of subpixels SP arranged in the pixel array area PAZ. It may include a driving circuit. The silicon substrate can be p-type or n-type. The silicon substrate may include a pixel array region (PAZ) and a circuit region (CZ). The circuit region CZ of the silicon substrate may be located around the pixel array region PAZ of the silicon substrate, and the circuit region CZ may exist on one side or a plurality of sides of the pixel array region PAZ, or It may exist around the periphery of the pixel array zone PAZ.

When the micro display device of the present invention is used in an electronic device, the pixel array PXA is separated from each other so that the first organic light emitting display module displaying the left eye image and the second organic light emitting display module displaying the right eye image are separated. It may be disposed 1:1 on the substrate. Alternatively, the positions of the first organic light emitting display module and the second organic light emitting display module may be separated and arranged on one substrate. In this case, the first organic light emitting display module and the second organic light emitting display module will be separated on one silicon substrate. When the first organic light emitting display module and the second organic light emitting display module are separated, the data line DL, the gate line GL, and the pixel array PXA may be separated, and the first organic light emitting display module and the second organic light emitting display module may be separated. Even if the two organic light emitting display modules are separated, at least part of the driving circuit can be shared because they can be driven with the same driving signal system.

The driving circuit of the micro display device of the present invention includes a gate driving circuit 120, a data driving circuit 130, a controller 140, a temperature sensor 150, a power supply circuit 160, and a gamma compensation circuit 170 can do.

The gate driving circuit 120 is disposed on one side of the pixel array PXA, and sequentially supplies the scan signal SCAN through the plurality of gate lines GL, thereby sequentially driving the plurality of gate lines GL do. The gate driving circuit 120 may sequentially supply a scan signal SCAN of an on voltage or an off voltage to a plurality of gate lines GL under the control of the controller 140. To this end, the gate driving circuit 120 may include a shift register or a level shifter.

The data driving circuit 130 is disposed above or below the pixel array PXA, receives image data from the controller 140 and supplies it to a plurality of data lines DL, thereby providing a plurality of data lines DL. Drive. When the specific gate line GL is opened by the gate driving circuit 120, the data driving circuit 130 converts the image data received from the controller 140 into analog-type image data VDATA, thereby converting a plurality of data lines ( DL).

The data driving circuit 130 may be located only on one side of the pixel array PXA, or may be located on both sides of the pixel array PXA according to a driving method or a design method. Here, as an example, a case in which one data driving circuit 130 is disposed in a horizontal direction on the upper side of the pixel array PXA is illustrated.

The data driving circuit 130 may include a shift register, a latch circuit, a digital-to-analog converter (DAC), an output buffer, and the like. Here, the digital-to-analog converter (DAC) is a configuration for converting the image data received from the controller 140 to the image data (VDATA) in analog form for supplying the data line (DL).

The controller 140 applies a scan signal SCAN to the pixel array PXA according to the timing implemented in each frame, and a data signal format using the input image data input from the outside in the data driving circuit 130 It converts according to the output and outputs the converted image data (VDATA), and controls the data driving at a suitable time according to the scan signal (SCAN). The controller 140 may be a timing controller used in a conventional display technology or a control device that further performs other control functions including a timing controller.

In the pixel array PXA, a plurality of data lines DL and a plurality of gate lines GL intersect, and pixels or subpixels SP are arranged in a matrix form. The pixel array PXA includes a reference voltage line commonly connected to the subpixel SP, a driving voltage line DVL that supplies the driving voltage ELVDD to the plurality of subpixels SP, and a subpixel SP. A sensing line SL for sensing the characteristic value may be further included.

The pixel array PXA is composed of a plurality of pixels, and each pixel is divided into a red sub-pixel, a green sub-pixel, and a blue sub-pixel for color realization, and may further include a white sub-pixel. A wiring such as one data line DL, gate line GL, and driving voltage line DVL may be connected to each subpixel SP.

The controller 140 receives input left-eye and right-eye image data and a timing signal synchronized thereto. The timing signal may include a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a clock signal (CLK), and a data enable signal (DE). The controller 140 sets the data timing control signal for controlling the operation timing of the data driving circuit 130 and the operation timing of the gate driving circuit 120 based on the timing signal and the DCS (Display Command Set) register setting value. A gate timing control signal for controlling is generated.

Meanwhile, the controller 140 and the driving circuits disposed in the circuit region CZ of the silicon substrate may further include a memory MEM. The memory MEM inside the controller 140 may temporarily store image data and output the image data to the data driving circuit 130 at a designated timing. The memory MEM may be disposed inside or outside the controller 140 or the driver circuit, and when disposed outside, the memory MEM may be disposed between the controller 140 and the driver circuit. In addition, the memory MEM may further include a buffer memory that stores image data received from the outside and supplies the stored image data to the controller 140.

The power circuit 160 may supply power required for driving the gate driving circuit 120, the data driving circuit 130, the controller 140, and the pixel array PXA. At this time, the power circuit 160 may include a power generator such as a DC-DC converter, and generate and output a voltage required by the pixel array PXA from various power voltages supplied from the outside. have. For example, the power circuit 160 may generate and output a driving voltage ELVDD, a reference voltage VREF, and a common voltage VCOM for driving the subpixel SP.

The temperature sensor 150 may be disposed at any position in the circuit region CZ of the organic light emitting display module 100, and one or a plurality of temperature sensors 150 may be disposed. The temperature value sensed by the temperature sensor 150 is transmitted to the controller 140, and the controller 140 refers to a lookup table (LUT) stored in the memory MEM according to the temperature value sensed by the temperature sensor 150. , To supply the gamma image data GDATA for compensating the luminance of the pixel array PXA to the data driving circuit 130 through the gamma compensation circuit 170, or the gamma common voltage GVCOM, and gamma driving voltage ( GELVDD) may be controlled to be supplied to the pixel array PXA through the power circuit 160.

Although the gamma compensation circuit 170 is configured to be disposed outside the controller 140, it may be possible to configure the gamma compensation circuit 170 in the form of a module inside the controller 140.

Here, the gate driving circuit 120 and the data driving circuit 130, the controller 140, the temperature sensor 150, the power supply circuit 160 disposed in the circuit region CZ of the organic light emitting display module 100, And a gamma compensation circuit 170, which may be called a display driving IC (DDI).

In addition, the driving circuit disposed in the circuit region CZ of the silicon substrate may include an interface INF for signal input/output or communication with other external electronic devices or electronic components. The interface INF may include, for example, one or more of a Low-Voltage Differential Signaling (LVDS) interface, a Mobile Industry Processor Interface (MIPI), and a serial interface.

In the micro display device of the present invention, in the DDI in the circuit region CZ of the organic light emitting display module 100 including the controller 140, image data VDATA and common voltage VCOM for luminance compensation according to temperature change , And gamma compensation of the driving voltage ELVDD. To this end, the gamma image data GVDATA, which is a compensation value of the image data VDATA according to the temperature change, the gamma common voltage GVCOM, which is a compensation value of the common voltage VCOM, and the gamma driving voltage GELVDD, which is a compensation value of the driving voltage. A look-up table is prepared, and the controller 140 refers to this to control the instant luminance compensation according to the temperature change.

7 is a block diagram showing a detailed configuration of a controller in a micro display device according to an embodiment of the present invention.

Referring to FIG. 7, in the micro display device of the present invention, the controller 140 may include a selector 142, a brightness compensation circuit 144, a common voltage compensation circuit 146, and a driving voltage compensation circuit 148. have. In addition, as described above, the gamma compensation circuit 170 may be electrically connected to the brightness compensation circuit 144 and disposed in the form of a module inside the controller 140.

The selector 142 receives a temperature value Tout transmitted from a plurality of temperature sensors 150 disposed at arbitrary positions of the organic light emitting display module 100, and the temperature sensor close to the sub-pixel SP to be compensated The temperature value (Tout) of 150 can be selected. At this time, the selector 142 calculates the average of the inter-frame sensing temperature values (Tout) to reduce the deviation of the sensing temperature values (Tout) by the plurality of temperature sensors 150, and the sensing temperature value (Tout) to It may be possible to select a specific temperature value (Tout) from the minimum value, maximum value, and average value for.

The temperature value Tout selected through the selector 142 is transmitted to the brightness compensation circuit 144, the common voltage compensation circuit 146, and the driving voltage compensation circuit 148.

The brightness compensation circuit 144, the common voltage compensation circuit 146, and the driving voltage compensation circuit 148 may store gamma compensation values of objects to be compensated according to the sensed temperature value Tout in the form of a look-up table. .

8A to 8C are diagrams illustrating examples of a look-up table stored in the brightness compensation circuit 144, the common voltage compensation circuit 146, and the driving voltage compensation circuit 148.

First, referring to FIG. 8A, the brightness compensation circuit 144 generates gamma image data GVDATA, which is a compensation value for the image data VDATA applied to the data driving circuit 130 according to the sensed temperature value Tout. This is the part to do. In order to compensate the image data VDATA applied to the data driving circuit 130 in accordance with the temperature change in the micro display device of the present invention, a digital brightness value (DBV) may be used.

The brightness signal DBV may be input in various ways, for example, a user using a micro display device may execute a brightness adjustment mode and select a desired brightness value to adjust the brightness of the micro display device. The brightness signal DBV may have various data values, for example, the brightness signal DBV may have a data value of 0 to 1,023. The data value of the brightness signal DBV may correspond to the brightness of the organic light emitting display module 100. For example, when the data value of the brightness signal DBV is "0", it may correspond to the darkest brightness of the organic light emitting display module 100, and when the data value of the brightness signal DBV is "1,023" There may be corresponding to the brightest brightness of the organic light emitting display module 100.

Accordingly, the brightness compensation weight for compensating the brightness signal DBV according to the temperature value Tout sensed by the temperature sensor 150 may be configured in the form of a look-up table. At this time, by constructing a look-up table with a plurality of zones (Zone0 to Zone9) having a predetermined range of distribution of the temperature value (Tout), it is possible to increase the processing speed for the luminance compensation of the controller 140. Accordingly, if the sensed temperature value Tout corresponds to a certain area (eg, Zone0 to Zone3), the brightness signal DBV is increased, and if it corresponds to another constant area (eg, Zone5 to Zone9), the brightness signal is increased. The brightness compensation value of the lookup table may be configured to lower (DBV). The area for the sensed temperature value Tout may be configured with a variable resistor.

At this time, the correction of the image data VDATA using the brightness signal DBV is relatively fast, but the correction for the common voltage VCOM or the driving voltage ELVDD enables stable brightness control, but the response speed is It can be relatively slow. Accordingly, in the organic light emitting display device of the present invention, the image data VDATA and the voltage (common voltage or driving voltage) are simultaneously compensated to provide high-speed and stable luminance compensation.

The brightness compensation circuit 144 extracts a brightness compensation value corresponding to the sensed temperature value Tout, and generates a gamma brightness signal GDBV reflecting the brightness compensation value in the brightness signal DBV. . The generated gamma brightness signal GDBV is transmitted to the gamma compensation circuit 170 to generate gamma image data GVDATA, which is a correction value of the image data VDATA applied to the data driving circuit 130. At this time, the gamma compensation circuit 170 may be disposed outside the controller 140 or may be disposed inside the controller 140 together with the brightness compensation circuit 144.

On the other hand, since the brightness compensation circuit 144 and the gamma compensation circuit 170 are driving circuits for compensating the image data VDATA according to the temperature of the organic light emitting display module 100 using the brightness signal DBV, the brightness compensation The circuit 144 and the gamma compensation circuit 170 may be collectively referred to as a data compensation circuit.

In contrast, the common voltage compensation circuit 246 and the driving voltage compensation circuit 248 are driving circuits for compensating the common voltage VCOM and the driving voltage ELVDD applied according to the temperature of the organic light emitting display module 100. , It may be referred to as a voltage compensation circuit.

The common voltage compensation circuit 146 extracts the gamma common voltage GVCOM, which is a compensation value of the common voltage VCOM, from the lookup table according to the sensed temperature value Tout, and transmits the gamma common voltage GVCOM to the power supply circuit 160. Accordingly, the power supply circuit 160 may apply the gamma common voltage (GVCOM) to the cathode electrode of the organic light emitting diode (OLED) through the common line.

8B shows an example of a look-up table for generating a gamma common voltage GVCOM, which is a compensation value for a common voltage VCOM applied to the power supply circuit 160 according to the sensed temperature value Tout. Even in this case, by dividing the distribution of the temperature value Tout into a plurality of zones (Zone0 to Zone9) having a predetermined range, it is possible to increase the processing speed for the luminance compensation of the controller 140.

The driving voltage compensation circuit 148 extracts the gamma driving voltage GELVDD, which is a compensation value of the driving voltage ELVDD, from the lookup table according to the sensed temperature value Tout, and transmits the gamma driving voltage GELVDD to the power supply circuit 160. Accordingly, the power supply circuit 160 may apply the gamma driving voltage GELVDD to the subpixel SP through the driving voltage line DVL.

8C shows an example of a look-up table for generating a gamma driving voltage GELVDD, which is a compensation value for a driving voltage ELVDD applied to the power supply circuit 160 according to the sensed temperature value Tout. Even in this case, by dividing the distribution of the temperature value Tout into a plurality of zones (Zone0 to Zone9) having a predetermined range, it is possible to increase the processing speed for the luminance compensation of the controller 140.

9 is a block diagram of a gamma compensation circuit in a micro display device according to an embodiment of the present invention.

Referring to FIG. 9, in the gamma compensation circuit 170, a plurality of gamma image data selection circuits for selecting gamma image data GVDATA using the gamma brightness signal GDBV may be configured in parallel. The gamma image data selection circuit may be composed of a multiplexer (MUX) and an OP amplifier connected to it and serving as a buffer.

A plurality of multiplexer (MUX) input terminals may be provided with a resistance string (R) connecting them. The resistor string R may be composed of a plurality of resistors connected in series and a plurality of divided voltage nodes disposed between the resistors. Accordingly, the multiplexer MUX selected by the gamma control signals GC_1 and ??GC_255 is connected to a specific voltage divider node in the resistance string R, and a gamma image according to the voltage between the gamma reference voltage VDDA and the connected voltage divider node. Data (GVDATA) will be output. For example, the gamma image data GVDATA may output a value between the first gamma image data GVDATA_1 for 255 gray levels and the 255 gamma image data GVDATA_255.

The OP amplifier, which acts as a buffer, prevents the current in the output stage from flowing back to the multiplexer (MUX) and keeps the output signal stable in the multiplexer (MUX).

At this time, the output signal of the multiplexer (MUX) constituting the upper bit and the OP amplifier is applied to the gamma reference voltage of the multiplexer (MUX) constituting the lower bit and the OP amplifier, thereby adjusting the signal interval of the gamma image data (GVDATA). Will be able to.

As described above, the micro display device of the present invention is configured by constructing a circuit capable of compensating for image data and voltage (common voltage or driving voltage) according to the temperature value in the circuit region CZ of the organic light emitting display module 100 , It is possible to perform luminance compensation with high speed and low power consumption without going through the application processor 200.

The above description and the accompanying drawings are merely illustrative of the technical spirit of the present invention, and those of ordinary skill in the art to which the present invention pertains combine configurations in a range that does not depart from the essential characteristics of the present invention. , Various modifications and variations such as separation, substitution and change will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

10: electronic device 11: video signal input
12L, 12R: Display device 13: Case
110: organic light emitting display module 120: gate driving circuit
130: data driving circuit 140: controller
142: selector 144: brightness compensation circuit
146: common voltage compensation circuit 148: driving voltage compensation circuit
150: temperature sensor 160: power circuit

Claims (20)

A silicon substrate including a pixel array in which a plurality of gate lines, a plurality of data lines, and a plurality of subpixels are arranged;
A gate driving circuit disposed on one side of the pixel array to drive the plurality of gate lines;
A data driving circuit disposed on the other side of the pixel array to drive the plurality of data lines;
A controller controlling signals applied to the gate driving circuit and the data driving circuit;
A temperature sensor disposed at one or more locations in the pixel array;
A power supply circuit that supplies a voltage required to drive the subpixels arranged in the pixel array;
A data compensation circuit that generates gamma image data for compensating image data applied to the data driving circuit according to the temperature value sensed by the temperature sensor and transmits the gamma image data to the data driving circuit; And
And a voltage compensation circuit that generates a gamma voltage that compensates for a voltage applied to the power supply circuit and transmits the gamma voltage to the power supply circuit according to the temperature value sensed by the temperature sensor.
According to claim 1,
And a selector for selecting one of the temperature values sensed by the temperature sensor.
According to claim 1,
The data compensation circuit
A brightness compensation circuit including a look-up table corresponding to a brightness compensation value according to a plurality of temperature values and outputting a brightness compensation value corresponding to the temperature value sensed by the temperature sensor; And
And a gamma compensation circuit that generates gamma image data to compensate for image data applied to the data driving circuit according to the brightness compensation value provided by the brightness compensation circuit.
According to claim 3,
The brightness compensation circuit is a micro display device disposed inside the controller.
According to claim 3,
The look-up table is a micro display device that divides the distribution of temperature values into a plurality of regions having a predetermined range.
According to claim 1,
The voltage compensation circuit
It includes a look-up table corresponding to a gamma common voltage corresponding to a compensation value of a common voltage according to a plurality of temperature values, and a common voltage compensation that delivers a gamma common voltage corresponding to a temperature value sensed by the temperature sensor to the power supply circuit. Micro display device comprising a circuit.
According to claim 1,
The voltage compensation circuit
A look-up table corresponding to a gamma driving voltage corresponding to a compensation value of a driving voltage according to a plurality of temperature values, and compensating for driving voltage to transmit a gamma driving voltage corresponding to a temperature value sensed by the temperature sensor to the power supply circuit Micro display device comprising a circuit.
The method of claim 6 or 7,
The common voltage compensation circuit or the driving voltage compensation circuit is a micro display device disposed inside the controller.
The method of claim 6 or 7,
The look-up table is a micro display device that divides a distribution of temperature values into a plurality of regions having a predetermined range.
A pixel array in which a plurality of subpixels are arranged, a gate driving circuit electrically connected to the pixel array through a plurality of gate lines, a data driving circuit electrically connected to the pixel array through a plurality of data lines, and the subpixel In a micro display device including a power supply circuit for supplying a voltage required to drive the, In the luminance compensation circuit for compensating the luminance of the pixel array according to the temperature,
A temperature sensor disposed at one or more locations in the pixel array;
A data compensation circuit that generates gamma image data for compensating image data applied to the data driving circuit according to the temperature value sensed by the temperature sensor and transmits the gamma image data to the data driving circuit; And
And a voltage compensation circuit that generates and transmits a gamma voltage that compensates for a voltage applied to the power supply circuit according to the temperature value sensed by the temperature sensor and transmits the gamma voltage to the power supply circuit.
The method of claim 10,
And a selector for selecting one of the temperature values sensed by the temperature sensor.
The method of claim 10,
The data compensation circuit
A brightness compensation circuit including a lookup table corresponding to a brightness compensation value according to a plurality of temperature values and outputting a brightness compensation value corresponding to the temperature value sensed by the temperature sensor; And
A luminance compensation circuit of a micro display device including a gamma compensation circuit that generates gamma image data to compensate for image data applied to the data driving circuit according to the brightness compensation value provided by the brightness compensation circuit.
The method of claim 12,
The look-up table is a luminance compensation circuit of a micro display device that divides a distribution of temperature values into a plurality of regions having a predetermined range.
The method of claim 10,
The voltage compensation circuit
It includes a look-up table corresponding to a gamma common voltage corresponding to a compensation value of a common voltage according to a plurality of temperature values, and a common voltage compensation that delivers a gamma common voltage corresponding to a temperature value sensed by the temperature sensor to the power supply circuit. A luminance compensation circuit of the micro display device including the circuit.
The method of claim 10,
The voltage compensation circuit
A look-up table corresponding to a gamma driving voltage corresponding to a compensation value of a driving voltage according to a plurality of temperature values, and compensating for driving voltage to transmit a gamma driving voltage corresponding to a temperature value sensed by the temperature sensor to the power supply circuit A luminance compensation circuit of the micro display device including the circuit.
A pixel array in which a plurality of subpixels are arranged, a gate driving circuit electrically connected to the pixel array through a plurality of gate lines, a data driving circuit electrically connected to the pixel array through a plurality of data lines, and the subpixel In the luminance control method of a micro-display device including a power supply circuit for supplying the voltage required to drive,
Sensing temperature at a temperature sensor disposed at one or more locations in the pixel array;
A data compensation step of generating gamma image data for compensating image data applied to the data driving circuit according to the temperature value sensed by the temperature sensor and transmitting the gamma image data to the data driving circuit; And
And generating a gamma voltage compensating for a voltage applied to the power circuit according to the temperature value sensed by the temperature sensor and transmitting the gamma voltage to the power circuit.
The method of claim 16,
And selecting a temperature value from among the temperature values sensed by the temperature sensor.
The method of claim 16,
The data compensation step
A brightness compensation step of outputting a brightness compensation value corresponding to the temperature value sensed by the temperature sensor from a lookup table corresponding to the brightness compensation value according to a plurality of temperature values; And
And a gamma compensation step of generating gamma image data to compensate for image data applied to the data driving circuit according to the brightness compensation value.
The method of claim 16,
The voltage compensation step
And a common voltage compensation step of transferring a gamma common voltage corresponding to the temperature value sensed by the temperature sensor from the lookup table corresponding to the gamma common voltage corresponding to the compensation value of the common voltage to the power supply circuit according to a plurality of temperature values. The luminance control method of the micro display device.
The method of claim 16,
The voltage compensation step
A driving voltage compensation step of transmitting a gamma driving voltage corresponding to the temperature value sensed by the temperature sensor to the power supply circuit from a lookup table corresponding to a gamma driving voltage corresponding to a compensation value of the driving voltage according to a plurality of temperature values. A method for controlling luminance of a micro display device comprising a.

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