Voltage setting method of display device and electronic device

Abstract

A voltage setting method of a display device and an electronic device are provided, the display device including a first pixel emitting a first color light in a first data voltage range, a second pixel emitting a second color light in a second data voltage range, and a third pixel emitting a third color light in a third data voltage range. The voltage setting method includes setting an initialization voltage commonly applied to gate electrodes of drive transistors included in the pixels. Setting the initialization voltage includes selecting a lowest minimum data voltage among minimum data voltages of the first data voltage range to the third data voltage range as a fixed test data voltage, and changing test data voltages and test initialization voltages of the pixels of the remaining colors except for the color corresponding to the fixed test data voltage to find a final test initialization voltage corresponding to a target luminance and a target color coordinate, and setting the final test initialization voltage as the initialization voltage.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2025-0056603, filed on April 29, 2025, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to an electronic device including a display device and a method for setting a voltage, the display device including a voltage setting device. Background Technology

[0004] With the development of information technology, display devices, which serve as a connection medium between users and information, have become increasingly important. Therefore, display technologies such as liquid crystal displays (LCDs) and organic light-emitting diode (OLEDs) are becoming increasingly important in daily life.

[0005] To reduce manufacturing costs, multiple display devices can be produced simultaneously on a large area of ​​mother glass, and then these display devices can be separated into individual display devices by scribing.

[0006] However, in cases where multiple display devices are simultaneously manufactured on a mother glass and then scribed, the resulting individual display devices may have different driving characteristics due to their different positions on the mother glass or for other reasons. Therefore, applying the same voltage amplitude to each of the individual display devices produced from a single mother glass may result in different brightness levels. Summary of the Invention

[0007] A voltage setting method for a display device according to an embodiment of the present disclosure is provided. The display device includes a plurality of pixels, including a plurality of first pixels that emit light of a first color within a first data voltage range, a plurality of second pixels that emit light of a second color within a second data voltage range, and a plurality of third pixels that emit light of a third color within a third data voltage range. The method includes: setting an initialization voltage commonly applied to the gate electrode of a driving transistor included in the pixel. Setting the initialization voltage includes: selecting the lowest minimum data voltage among the minimum data voltages from the first data voltage range to the third data voltage range as a fixed test data voltage; changing the test data voltage and test initialization voltage of the pixels among the plurality of pixels of colors other than the color corresponding to the fixed test data voltage to find a final test initialization voltage corresponding to a target brightness and a target color coordinate; and setting the final test initialization voltage as the initialization voltage.

[0008] According to the implementation method, the voltage setting method may further include setting data voltages for multiple pixels. The data voltages for the multiple pixels may be set to be greater than or substantially equal to the test data voltages corresponding to the target brightness, target color coordinates, and final test initialization voltage.

[0009] According to the implementation method, setting the final test initialization voltage as the initialization voltage may include: changing the test initialization voltage and test data voltage of pixels in a plurality of pixels of other colors to search for a voltage set corresponding to the target brightness and target color coordinates; and setting the test initialization voltage of the voltage set with the largest test initialization voltage in the searched voltage set as the final test initialization voltage.

[0010] According to the implementation method, setting the final test initialization voltage as the initialization voltage may include: setting the initial test initialization voltage and changing the test data voltage of the pixels in the plurality of pixels of the other colors; checking whether the current brightness and current color coordinates fall within the target range; and if the current brightness and current color coordinates do not fall within the target range, then performing the change of the test data voltage of the pixels in the plurality of pixels of the other colors again.

[0011] According to the implementation method, setting the final test initialization voltage as the initialization voltage may further include: if the current brightness and current color coordinates fall within the target range, checking whether the test data voltages of the pixels in the plurality of pixels of the other colors fall within the corresponding data voltage range; and if the test data voltages of the pixels in the plurality of pixels of the other colors fall within the corresponding data voltage range, setting the current test initialization voltage as the final test initialization voltage.

[0012] According to the implementation method, setting the final test initialization voltage to the initialization voltage may further include: if the test data voltage of the pixels in the plurality of pixels of other colors does not fall within the corresponding data voltage range, then reducing the current test initialization voltage.

[0013] According to the implementation method, setting the final test initialization voltage as the initialization voltage may further include: checking whether the current test initialization voltage is greater than the minimum initialization voltage; if the current test initialization voltage is greater than the minimum initialization voltage, then performing the test data voltage change of the pixels in the other multiple pixels of the remaining colors again.

[0014] According to the implementation method, setting the final test initialization voltage as the initialization voltage may further include: if the current test initialization voltage is less than the minimum initialization voltage, then determining that the display device is defective.

[0015] A voltage setting method for a display device according to an embodiment of the present disclosure is provided. The display device includes a plurality of pixels, including a plurality of first pixels that emit light of a first color within a first data voltage range, a plurality of second pixels that emit light of a second color within a second data voltage range, and a plurality of third pixels that emit light of a third color within a third data voltage range. The voltage setting method includes setting an initialization voltage commonly applied to the gate electrode of a driving transistor included in the pixel. Setting the initialization voltage includes: setting an initial test initialization voltage; changing the test data voltages of the plurality of pixels and the initial test initialization voltage to find a final test initialization voltage corresponding to target brightness and target color coordinates; and setting the final test initialization voltage as the initialization voltage. The final test initialization voltage may be less than or substantially equal to the initial test initialization voltage.

[0016] According to the implementation method, setting the final test initialization voltage as the initialization voltage may include: changing the test data voltage of the pixel; checking whether the current brightness and current color coordinates fall within the target range; and if the current brightness and current color coordinates do not fall within the target range, then changing the test data voltage again.

[0017] According to the implementation method, setting the final test initialization voltage as the initialization voltage may further include: if the current brightness and current color coordinates fall within the target range, checking whether the test data voltage of the pixel falls within the corresponding data voltage range; and if the test data voltage falls within the corresponding data voltage range, setting the current test initialization voltage as the final test initialization voltage.

[0018] According to the implementation method, setting the final test initialization voltage as the initialization voltage may also include: if the test data voltage does not fall within the corresponding data voltage range, then reducing the current test initialization voltage.

[0019] According to the implementation method, setting the final test initialization voltage to the initialization voltage may further include: checking whether the current test initialization voltage is greater than the minimum initialization voltage; and if the current test initialization voltage is greater than the minimum initialization voltage, then performing the change test data voltage again.

[0020] According to the implementation method, setting the final test initialization voltage as the initialization voltage may further include: if the current test initialization voltage is less than the minimum initialization voltage, then determining that the display device is defective.

[0021] An electronic device including a display device according to an embodiment is provided, the display device including a voltage setting device for setting a voltage of the display device. The display device includes a plurality of pixels, the plurality of pixels including a plurality of first pixels emitting light of a first color in a first data voltage range, a plurality of second pixels emitting light of a second color in a second data voltage range, and a plurality of third pixels emitting light of a third color in a third data voltage range. The voltage setting device includes: a test control unit configured to provide a test voltage to the display device to enable the display device to display an image; and an optical system configured to measure the brightness and color coordinates of the image. The test voltage includes a test initialization voltage and a test data voltage. The voltage of the display device is an initialization voltage commonly applied to the gate electrode of a driving transistor included in the plurality of pixels. The test control unit is further configured to select the lowest minimum data voltage among the minimum data voltages in the first data voltage range to the third data voltage range as a fixed test data voltage. The test control unit is further configured to: change the test initialization voltage and test data voltage of pixels of colors other than the color corresponding to the fixed test data voltage to find a final test initialization voltage corresponding to a target brightness and a target color coordinate; and set the final test initialization voltage as the initialization voltage.

[0022] According to the implementation method, the test control unit is also configured to set the data voltage of the pixel. The data voltage of the pixel can be set to be greater than or substantially equal to the test data voltage corresponding to the target brightness, target color coordinates, and final test initialization voltage.

[0023] According to an implementation, the test control unit can also be configured to search for a voltage set corresponding to the target brightness and target color coordinates by changing the test initialization voltage and test data voltage of multiple pixels of other colors. The test control unit can also be configured to set the test initialization voltage of the voltage set with the largest test initialization voltage in the searched voltage set as the final test initialization voltage.

[0024] According to the implementation method, the test control unit can also be configured to set an initial test initialization voltage and change the test data voltages of pixels of other colors. The test control unit can also be configured to check whether the current brightness and current color coordinates fall within the target range. The test control unit can also be configured to, if the current brightness and current color coordinates do not fall within the target range, change the test data voltages of multiple pixels of other colors again.

[0025] According to the implementation method, the test control unit can also be configured to check whether the test data voltages of the pixels of other colors fall within the corresponding data voltage range if the current brightness and current color coordinates fall within the target range. The test control unit can also be configured to set the current test initialization voltage as the final test initialization voltage if the test data voltages of the pixels of other colors fall within the corresponding data voltage range.

[0026] According to the implementation method, the test control unit can also be configured to reduce the current test initialization voltage if the test data voltage of the pixels of other colors does not fall within the corresponding data voltage range. Attached Figure Description

[0027] The above and other features of this disclosure will become more apparent from the exemplary embodiments described in more detail with reference to the accompanying drawings.

[0028] Figure 1 This is a diagram illustrating a display device according to an embodiment of the present disclosure.

[0029] Figure 2 This is a diagram illustrating pixels according to an embodiment of the present disclosure.

[0030] Figure 3 and Figure 4 This is a diagram illustrating the change in display frequency according to an embodiment of the present disclosure.

[0031] Figure 5 This is a diagram used to illustrate the address scan cycle according to embodiments of the present disclosure.

[0032] Figure 6 This is a diagram used to illustrate the self-scanning cycle according to embodiments of the present disclosure.

[0033] Figure 7 This is a diagram illustrating a voltage setting device according to an embodiment of the present disclosure.

[0034] Figure 8 This is a diagram illustrating a voltage setting method for a display device according to an embodiment of the present disclosure.

[0035] Figure 9 This is a diagram illustrating the steps of setting the initialization voltage according to an embodiment of the present disclosure.

[0036] Figure 10 This is a diagram illustrating the steps for setting an initialization voltage according to an embodiment of the present disclosure.

[0037] Figure 11 This is a diagram illustrating the steps for setting an initialization voltage according to an embodiment of the present disclosure.

[0038] Figure 12 This is a block diagram of an electronic device according to an embodiment.

[0039] Figures 13 to 15 These are schematic diagrams of electronic devices according to various embodiments. Detailed Implementation

[0040] Various embodiments of this disclosure are described in detail below with reference to the accompanying drawings to facilitate practice by those skilled in the art to which this disclosure pertains. This disclosure may be implemented in many different forms and is not limited to the embodiments described herein.

[0041] For clarity of this disclosure, parts irrelevant to the description have been omitted, and the same or similar reference numerals are used throughout the specification to denote the same or similar components. Therefore, the above reference numerals can be used in other figures.

[0042] While each figure may represent one or more specific embodiments of the present disclosure, and the figures are drawn to scale so that relative lengths, thicknesses, and angles can be inferred from them, it will be understood that the invention is not necessarily limited to the relative lengths, thicknesses, and angles shown. These values ​​may be modified within the spirit and scope of the present disclosure, for example, to allow for manufacturing limitations, etc.

[0043] According to embodiments of this disclosure, a voltage setting apparatus and a voltage setting method are provided. The method sets (or determines) an initialization voltage in a display device by applying a voltage set (or a combination of test data voltage and test initialization voltage) to a pixel and checking whether the resulting brightness and color coordinates displayed by the pixel in the display device fall within a target range. The goal is to set the initialization voltage as high as possible for the target range of color coordinates and brightness to reduce afterimages. Figure 10 and Figure 11 In some implementations, another objective is to ensure that the test data voltage used is within the data voltage range. For example... Figure 9 and Figure 10 As shown in the implementation, another variation is to change the data voltage of only two of the three colors displayed on the display device.

[0044] Figure 7 The voltage setting device ED may include an optical system 110 and a test control unit 120. The test control unit 120 may apply a voltage set to the pixels of the display device during the test method, and the optical system 110 acquires an image displayed on the display device, along with the image's brightness and color coordinates, and provides this to the test control unit 120. Embodiments of this disclosure seek to set an initialization voltage that not only achieves brightness and color coordinates within a target range, but also that the initialization voltage is as high as possible to reduce afterimages.

[0045] When the term "identical" is used in a description, it is intended to mean "substantially identical," that is, identical to the degree that a person skilled in the art would be certain of. Other expressions may omit "substantially."

[0046] Figure 1 This is a diagram illustrating a display device according to an embodiment of the present disclosure.

[0047] refer to Figure 1 The display device 10 according to embodiments of the present disclosure may include a timing controller 11, a data driver 12, a scan driver 13, a pixel unit 14, a transmission driver 15, a power supply 16, and a memory 17.

[0048] The timing controller 11 can receive gray levels for an input image (or input frame). The gray levels may include a first color gray level, a second color gray level, and a third color gray level. The first color gray level may be a gray level representing a first color, the second color gray level may be a gray level representing a second color, and the third color gray level may be a gray level representing a third color.

[0049] In addition, the timing controller 11 can receive control signals for the image. These control signals may include a horizontal synchronization signal, a vertical synchronization signal, and a data enable signal. The vertical synchronization signal may include multiple pulses, each of which indicates the end of the previous frame period and the beginning of the current frame period based on the timing of its occurrence. The interval between adjacent pulses of the vertical synchronization signal may correspond to a frame period. The horizontal synchronization signal may include multiple pulses, each of which indicates the end of the previous horizontal period and the beginning of a new horizontal period based on the timing of its occurrence. The interval between adjacent pulses of the horizontal synchronization signal may correspond to a horizontal period. The data enable signal may have an enable level for a specific horizontal period and a disable level for the remainder of the period. When the data enable signal is at the enable level, it may indicate which horizontal periods are provided with color grayscale levels.

[0050] The timing controller 11 can provide the data driver 12 with grayscale levels for rendering or calibration to meet the specifications of the display device 10. Furthermore, the timing controller 11 can provide the scan driver 13 with clock signals, scan start signals, etc. The timing controller 11 can also provide the transmit driver 15 with clock signals, transmit stop signals, etc.

[0051] The data driver 12 can generate data voltages for the data lines DL1, ..., DLj, ..., DLq using control signals received from the timing controller 11 and gray levels, where q can be an integer greater than 2 and j can be an integer greater than 1 and less than q. The data driver 12 can sample the gray levels using a clock signal and apply the data voltages corresponding to the gray levels to the data lines DL1, ..., DLj, ..., DLq in pixel rows.

[0052] The amplitude of the data voltage can vary according to the corresponding gray level. Data voltage can include black data voltage. Black data voltage can be the data voltage that should be written to a pixel when the pixel displays a black image. For example, black data voltage can correspond to the smallest gray level (e.g., zero gray level).

[0053] The amplitude of the data voltage can vary depending on the maximum brightness of the display device 10. Maximum brightness can be the brightness of light emitted by a pixel set to its maximum gray level (e.g., gray level 255 when represented by 8 bits). For example, maximum brightness can be the brightness of white light produced by a pixel in pixel unit 14 that emits light corresponding to a white gray level. The unit of brightness can be nits. Maximum brightness can be named the display brightness value. This maximum brightness can be manually set by the user operating the display device 10, or it can be automatically set by an algorithm associated with a brightness sensor, etc. For example, the maximum value of the maximum brightness can be 2175 nits, and the minimum value can be 4 nits. The maximum and minimum values ​​of the maximum brightness can vary depending on the product. Even for the same gray level, different maximum brightness will result in different data voltages, which will lead to different pixel brightness.

[0054] Scan driver 13 may include a first scan driver 13GW, a second scan driver 13GB, a third scan driver 13GI, and a fourth scan driver 13GC. The first scan driver 13GW can provide a first scan signal to first scan lines GW1, ..., GWi, ..., GWp, where p can be an integer greater than 2, and i can be an integer greater than 1 and less than p. The second scan driver 13GB can provide a second scan signal to second scan lines GB1, ..., GBi, ..., GBp. The third scan driver 13GI can provide a third scan signal to third scan lines GI1, ..., Gii, ..., GIp. The fourth scan driver 13GC can provide a fourth scan signal to fourth scan lines GC1, ..., GCI, ..., GCp.

[0055] For example, the first scan driver 13GW can receive at least one scan clock signal and a scan start signal from the timing controller 11 to generate a first scan signal to be provided to the first scan lines GW1 to GWp. The first scan driver 13GW can sequentially provide the first scan signal with pulses having an on-level to the first scan lines GW1 to GWp. For example, the first scan driver 13GW can be configured as a shift register and can generate the first scan signal by sequentially transmitting the scan start signal in the form of pulses with an on-level under the control of the scan clock signal to the next scan stage.

[0056] Each of the second scan driver 13GB, the third scan driver 13GI, and the fourth scan driver 13GC can be configured similarly to the first scan driver 13GW, and therefore redundant descriptions are omitted. According to embodiments, at least some of the first scan driver 13GW, the second scan driver 13GB, the third scan driver 13GI, and the fourth scan driver 13GC can be a single, uninterrupted structure (or integrated). For example, two or more scan drivers can be a single, uninterrupted structure if the polarity and width of the pulses are the same. For example, referring now... Figure 5 The third scan driver 13GI and the fourth scan driver 13GC can be a single uninterrupted structure because the polarity and width of the pulse applied to the conduction level of the third scan line GIi at time point t2a are the same as the pulse applied to the conduction level of the fourth scan line GCI at time point t3a.

[0057] Transmit driver 15 can generate transmit signals to be provided to transmit lines EM1, ..., EMi, ..., EMp by receiving at least one transmit clock signal and a transmit stop signal from timing controller 11. Transmit driver 15 can sequentially provide transmit signals with pulses having a cutoff level to transmit lines EM1 to EMp. For example, transmit driver 15 can be configured as a shift register and can generate transmit signals by sequentially transmitting a transmit stop signal in the form of pulses with a cutoff level under the control of the transmit clock signal to the next transmit stage.

[0058] exist Figure 1In the diagram, the first scan lines GW1 to GWp, the second scan lines GB1 to GBp, the third scan lines GI1 to GIp, the fourth scan lines GC1 to GCp, and the emission lines EM1 to EMp are each shown as p. However, in other embodiments, at least one of the second scan lines GB1 to GBp, the third scan lines GI1 to GIp, the fourth scan lines GC1 to GCp, and the emission lines EM1 to EMp can be configured to be p / 2 or fewer. For example, two adjacent pixel rows can share a second scan line. Similarly, two adjacent pixel rows can share a third scan line, a fourth scan line, or an emission line. A pixel row refers to pixels connected to the same first scan line.

[0059] Pixel unit 14 may include a pixel PXij. Each pixel PXij may be connected to a corresponding data line DLj, scan line GWi, GBi, GIi, GCI, and emission line EMi. Each pixel PXij may include a light-emitting element that emits light based on the received data voltage.

[0060] Pixel unit 14 may include a first pixel emitting light of a first color, a second pixel emitting light of a second color, and a third pixel emitting light of a third color. The first color, second color, and third color may be different colors. For example, the first color may be any one of red, green, and blue; the second color may be any one of red, green, and blue other than the first color; and the third color may be any other one of red, green, and blue other than the first color and the second color. Furthermore, magenta, cyan, and yellow may be used instead of red, green, and blue as the first to third colors. For simplicity, it is assumed below that the first color is red, the second color is green, and the third color is blue.

[0061] Pixels PXij can be arranged into various shapes, such as diamonds (PENTILE). ® RGB stripes, S-stripes, Real RGB, and standard Pentium ® wait.

[0062] Power supply 16 can provide a voltage commonly supplied to pixel PXij of pixel unit 14. For example, power supply 16 can provide a first power supply voltage ELVSS, a second power supply voltage ELVDD, an initialization voltage VINT, an anode initialization voltage VAINT, and a bias voltage VOBS. For example, power supply 16 can be a power management integrated circuit (PMIC). For example, power supply 16 can include multiple DC-DC converters.

[0063] Memory 17 can store at least some of the set voltage values ​​among ELVSS, ELVDD, VINT, VAINT, VOBS, ... (Refer to...) Figures 8 to 11The method for setting the voltage values ​​stored in memory 17 is described in more detail. For example, timing controller 11 can adjust the amplitude of voltages ELVDD, ELVSS, VINT, VAINT, VOBS, ... and data voltages supplied from data driver 12 by referring to the voltage values ​​in memory 17.

[0064] According to an embodiment, the timing controller 11 and the data driver 12 may be configured as (e.g., a single) integrated circuit. Furthermore, the timing controller 11, the data driver 12, and the power supply 16 may be configured as (e.g., a single) integrated circuit. Additionally, at least some of the timing controller 11, the data driver 12, the power supply 16, the scan driver 13, the transmit driver 15, and the memory 17 may be configured as (e.g., a single) integrated circuit. The configuration of each of these components may be determined, either integrally or individually, depending on the product.

[0065] Figure 2 This is a diagram illustrating pixels according to an embodiment of the present disclosure.

[0066] refer to Figure 2 Pixel PXij may include pixel circuit PXC and light-emitting element LD. Pixel circuit PXC includes transistors T1, T2, T3, T4, T5, T6, T7, T8 and storage capacitor Cst.

[0067] Pixel PXij can be located in the i-th pixel row and the j-th pixel column. Pixel PXij can be the first pixel representing the first color, the second pixel representing the second color, or the third pixel representing the third color.

[0068] P-type transistors can be polycrystalline silicon semiconductor transistors. The channel of the active layer of a polycrystalline silicon semiconductor transistor can also include polycrystalline silicon semiconductor. For example, a polycrystalline silicon semiconductor transistor can be a low-temperature polycrystalline silicon (LTPS) thin-film transistor. Polycrystalline silicon semiconductor transistors have high electron mobility and therefore exhibit fast drive characteristics.

[0069] N-type transistors can be oxide semiconductor transistors. The channel of the active layer of an oxide semiconductor transistor can also include oxide semiconductor. For example, an oxide semiconductor transistor can be a low-temperature polycrystalline oxide (LTPO) thin-film transistor. Compared to polycrystalline silicon semiconductor transistors, oxide semiconductor transistors have lower charge mobility. Therefore, compared to polycrystalline silicon semiconductor transistors, oxide semiconductor transistors can have less leakage current in the off state.

[0070] The first transistor T1 may have a gate electrode connected to a first node N1, a first electrode connected to a second node N2, and a second electrode connected to a third node N3. The first transistor T1 may be a driving transistor. The first transistor T1 may be a P-type transistor.

[0071] The second transistor T2 may have a gate electrode connected to the first scan line GWi, a first electrode connected to the data line DLj, and a second electrode connected to the second node N2. The second transistor T2 may be a switching transistor. The second transistor T2 may be a P-type transistor.

[0072] The first scan driver 13GW can provide a first scan signal with a conduction level, which determines when pixel PXij receives a data voltage. For example, in response to receiving the first scan signal with a conduction level, the second transistor T2 can be turned on, and the second transistor T2 can apply the data voltage applied to data line DLj to the second node N2.

[0073] The third transistor T3 may have a gate electrode connected to the fourth scan line GCI, a first electrode connected to the first node N1, and a second electrode connected to the third node N3. The third transistor T3 may be a diode-connected transistor. The third transistor T3 may be an N-type transistor.

[0074] The fourth transistor T4 may have a gate electrode connected to the third scan line GIi, a first electrode connected to the first node N1, and a second electrode that receives the initialization voltage VINT. The fourth transistor T4 may be a gate initialization transistor. The fourth transistor T4 may be an N-type transistor.

[0075] The fifth transistor T5 may have a gate electrode connected to the emitter line EMi, a first electrode receiving the second power supply voltage ELVDD, and a second electrode connected to the second node N2. The fifth transistor T5 may be a first emitter control transistor. The fifth transistor T5 may be a P-type transistor.

[0076] The sixth transistor T6 may have a gate electrode connected to the emitter line EMi, a first electrode connected to the third node N3, and a second electrode connected to the fourth node N4. The sixth transistor T6 may be a second emitter control transistor. The sixth transistor T6 may be a P-type transistor.

[0077] The seventh transistor T7 may have a gate electrode connected to the second scan line GBi, a first electrode receiving the anode initialization voltage VAINT, and a second electrode connected to the fourth node N4. The seventh transistor T7 may be an anode initialization transistor. The seventh transistor T7 may be a P-type transistor. The amplitude of the anode initialization voltage VAINT may differ from the amplitude of the initialization voltage VINT.

[0078] The anode initialization voltage VAINT can be set differently depending on the type of light-emitting element (LD). The emission start time can also vary depending on the type of LD, and different emission start times may cause color ghosting. For example, the anode initialization voltage VAINT for a first-color LD, the anode initialization voltage VAINT for a second-color LD, and the anode initialization voltage VAINT for a third-color LD can be set differently. In one embodiment, the anode initialization voltage VAINT for two colors of LD can be set to the same value, and the anode initialization voltage VAINT for the remaining color of LD can be set differently. In another embodiment, the anode initialization voltage VAINT for all LDs can be set to the same value. This allows for adjustment of the emission timing differences for each color of LD to prevent color ghosting.

[0079] The initialization voltage VINT can be set commonly for pixels PXij of the first, second, and third colors. That is, the initialization voltage VINT can be applied at the same voltage level to the gate electrode of the driving transistor included in pixels PXij of all colors.

[0080] The second scan driver 13GB can provide a second scan signal with an on-level, which determines the timing for initializing the anode voltage of the light-emitting element LD. For example, in response to receiving the second scan signal with an on-level, the seventh transistor T7 can be turned on, and the anode initialization voltage VAINT can be applied to the anode of the light-emitting element LD, such that the anode voltage of the light-emitting element LD is initialized to the anode initialization voltage VAINT.

[0081] The eighth transistor T8 may have a gate electrode connected to the second scan line GBi, a first electrode receiving the bias voltage VOBS, and a second electrode connected to the second node N2. The eighth transistor T8 may be a bias transistor. The eighth transistor T8 may be a P-type transistor.

[0082] The storage capacitor Cst may have a first electrode that receives the second power supply voltage ELVDD, and the second electrode may be connected to the first node N1.

[0083] The anode of the light-emitting element (LD) can be connected to the fourth node N4, and the cathode of the LD can receive the first power supply voltage ELVSS. The LD can emit light of one of a first color, a second color, and a third color. The LD can be a light-emitting diode (LED). The LD can include organic LEDs, inorganic LEDs, quantum dot / quantum well LEDs, etc. In one embodiment, the LD is disposed in each pixel PXij, but in other embodiments, multiple LDs can be disposed in each pixel PXij. The LDs can be connected in series, parallel, series / parallel, etc.

[0084] Figure 3 and Figure 4 This is a diagram illustrating the change in display frequency according to an embodiment of the present disclosure.

[0085] Display device 10 can support variable refresh rate (VRR). Refresh rate is the frequency at which data voltage is written to pixel PXij, which can also be called screen scan rate, screen playback rate, and can represent the number of image frames played per second.

[0086] For example, pixel unit 14 can display an image at a first frequency AHz in the first mode (see...). Figure 3 ), and can display images in the second mode at a second frequency BHz, which is less than the first frequency AHz (see Figure 4 ).

[0087] For example, in a first mode, each frame period 1F for each pixel PXij may include (e.g., a single) address scan period AS and (e.g., a single) self-scan period SS. For example, in a second mode, each frame period 1F for each pixel PXij may include (e.g., a single) address scan period AS and multiple self-scan periods SS. Because the second frequency BHz is smaller, the number of self-scan periods SS included in (e.g., a single) frame period 1F can be increased. In another example, in a third mode, each frame period 1F for each pixel PXij may include an address scan period AS but does not include self-scan periods SS.

[0088] The address scan cycle AS is the period during which data voltage is written to pixel PXij. The address scan cycle AS can also be named the data programming cycle for receiving data voltage from data line DLj.

[0089] The self-scan cycle SS is the period during which no data voltage is written to pixel PXij. During the emission period of the self-scan cycle SS, pixel PXij can emit light using the data voltage written in the address scan cycle AS. The length of the self-scan cycle SS can be the same as the length of the address scan cycle AS.

[0090] Figure 5 This is a diagram illustrating the address scan cycle according to an embodiment of the present disclosure. In the description... Figure 5 When, refer to Figure 2 The pixel PXij.

[0091] At time point t1a, a cutoff level (high level) transmit signal can be applied to the transmit line EMi, causing the fifth transistor T5 and the sixth transistor T6 to be cut off, and the pixel PXij to be in a non-emitting state.

[0092] At time point t2a, a third scan signal with a conduction level (high level) can be applied to the third scan line GIi that turns on the fourth transistor T4. Therefore, an initialization voltage VINT can be applied to the first node N1. The initialization voltage VINT can be a sufficiently low voltage to bias the first transistor T1 to conduct.

[0093] At time point t3a, the third transistor T3 can be turned on by applying the fourth scan signal, which is at the on level (high level), to the fourth scan line GCI. Therefore, the first transistor T1 is in a diode connection state in which the drain electrode and the gate electrode are connected.

[0094] At time point t4a, the second transistor T2 can be turned on by applying a first scan signal at a low level to the first scan line GWi. Therefore, the data voltage of the data line DLj can be applied to the first node N1 through the second transistor T2, the first transistor T1, and the third transistor T3, all of which are in the on state. At this time, the voltage at the first node N1 can be a compensation voltage, which is the data voltage minus the threshold voltage of the first transistor T1. The storage capacitor Cst can maintain the difference between the second power supply voltage ELVDD and the compensation voltage.

[0095] At time point t5a, a second scan signal at a conduction level (low level) can be applied to the second scan line GBi, thereby turning on the seventh transistor T7 and the eighth transistor T8. When the seventh transistor T7 is turned on, the anode initialization voltage VAINT is applied to the anode of the light-emitting element LD, and the light-emitting element LD can be initialized with the amount of charge corresponding to the voltage difference between the anode initialization voltage VAINT and the first power supply voltage ELVSS. Therefore, it is beneficial to achieve low grayscale representation of the light-emitting element LD.

[0096] Furthermore, when the eighth transistor T8 is turned on, the voltage at the second node N2 can be set to the bias voltage VOBS. Therefore, since the bias voltage VOBS is applied to the source electrode of the first transistor T1, hysteresis can be prevented and the on-bias state can be ensured.

[0097] At time point t6a, the fifth transistor T5 and the sixth transistor T6 can be turned on by applying a low-level transmit signal to the transmit line EMi. This forms a path for the drive current flowing from the second power supply voltage ELVDD through the fifth transistor T5, the first transistor T1, the sixth transistor T6, and the light-emitting element LD to the first power supply voltage ELVSS.

[0098] The amount of drive current can be adjusted based on the voltage maintained on the storage capacitor Cst. The light-emitting element LD emits light with a brightness corresponding to the amount of drive current. The light-emitting element LD can emit light until a cutoff level emission signal is applied to the emission line EMi.

[0099] Figure 6 This is a diagram used to illustrate the self-scanning cycle according to embodiments of the present disclosure. In the description... Figure 6 When, refer to Figure 2 The pixel PXij.

[0100] At time point t7a, a cutoff level (high level) transmit signal is applied to the transmit line EMi, causing the fifth transistor T5 and the sixth transistor T6 to be cut off, and the pixel PXij to be in a non-emitting state.

[0101] During time points t7a to t8a, the first scan line GWi, the third scan line GIi, and the fourth scan line GCI remain at the off level. Therefore, the voltage at the first node N1 remains unchanged.

[0102] At time point t8a, a low-level scan signal can be applied to the second scan line GBi, thereby turning on the seventh transistor T7 and the eighth transistor T8. When the seventh transistor T7 is turned on, the anode initialization voltage VAINT is applied to the anode of the light-emitting element LD, and the light-emitting element LD can be initialized with the amount of charge corresponding to the voltage difference between the anode initialization voltage VAINT and the first power supply voltage ELVSS. Therefore, it is beneficial to achieve low grayscale representation of the light-emitting element LD.

[0103] Furthermore, when the eighth transistor T8 is turned on, the voltage of the second node N2 can be set to the bias voltage VOBS. Therefore, since the bias voltage VOBS is applied to the source electrode of the first transistor T1, hysteresis can be prevented and the on-bias state can be ensured.

[0104] At time point t9a, the fifth transistor T5 and the sixth transistor T6 can be turned on by applying a low-level transmit signal to the transmit line EMi. This forms a path for the drive current flowing from the second power supply voltage ELVDD through the fifth transistor T5, the first transistor T1, the sixth transistor T6, and the light-emitting element LD to the first power supply voltage ELVSS.

[0105] The amount of drive current can be adjusted based on the voltage maintained in the storage capacitor Cst. Since the voltage of the first node N1 recorded during the address scan cycle AS is maintained during the self-scan cycle SS, the brightness of pixel PXij in the self-scan cycle SS is the same as the brightness of pixel PXij in the address scan cycle AS.

[0106] Figure 7 This is a diagram illustrating a voltage setting device according to an embodiment of the present disclosure.

[0107] refer to Figure 7 The voltage setting device ED according to embodiments of the present disclosure may include an optical system 110 and a test control unit 120. The optical system 110 can measure the luminance and color coordinates of an image. For example, the optical system 110 may include a camera, a luminance meter, a colorimeter, a spectrometer, a spectrophotometer, etc. The test control unit 120 may be a computing device. For example, the computing device may include a recording medium and a processor. The recording medium and the processor may be located on the same physical device, but may also be located on physically different devices, such as by utilizing cloud technology.

[0108] Recording media can include any type of recording device capable of storing data or programs that can be read by a processor. Examples of processor-readable storage media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, hard disk, external hard disk, SSD, USB storage device, DVD, and Blu-ray. ® Disks, etc. Processor-readable storage media can also be a combination of multiple devices and can be distributed across networked computer systems. Such recording media can be non-transitory computer-readable media. Non-transitory recording media can be media that store data or programs on a semi-permanent basis and can be read by the processor, as opposed to media that temporarily store data or programs, such as registers, caches, and memory.

[0109] The test control unit 120 can provide a test voltage to the display device 10' so that the display device 10' can display an image. The test voltage can include a test initialization voltage and a test data voltage. For example, the test initialization voltage can be a voltage applied during the voltage setting process that replaces the initialization voltage VINT. For example, the test data voltage can be a voltage applied during the voltage setting process that replaces the data voltage.

[0110] Display device 10' may refer to a single display device or multiple display devices. Display device 10' may be one of multiple display devices disposed on a mother glass having a large area. For example, the voltage setting process may be performed before the mother glass is etched.

[0111] The optical system 110 can acquire an image displayed by the display device 10' based on a test voltage, measure the brightness of the image, or measure the color coordinates of the image. The optical system 110 can provide the image, the brightness of the image, the color coordinates of the image, etc., to the test control unit 120.

[0112] The test control unit 120 can set a test voltage suitable for the display device 10' to the voltage value of the display device 10'. The set voltage value can be stored in the memory 17 of the display device 10'.

[0113] Figure 8 This is a diagram illustrating a voltage setting method for a display device according to an embodiment of the present disclosure.

[0114] First, the test control unit 120 can set the first power supply voltage ELVSS of the display device 10' (step S101). At this time, the first power supply voltage ELVSS can be set independently for each maximum brightness level. For example, the drive current required when the maximum brightness is 2175 nits can be greater than the drive current required when the maximum brightness is 1200 nits. For example, the difference between the second power supply voltage ELVDD and the first power supply voltage ELVSS when the maximum brightness is 2175 nits can be greater than the difference between the second power supply voltage ELVDD and the first power supply voltage ELVSS when the maximum brightness is 1200 nits. For example, the higher the maximum brightness, the lower the first power supply voltage ELVSS can be set.

[0115] Each of the subsequent steps S102, S103, S104, S105, and S106 can also be performed independently for each of the maximum brightness steps, and will not be described in this document.

[0116] Next, the test control unit 120 can set the black data voltage of the display device 10' (step S102). As described above, the black data voltage can be the data voltage written to the pixel when the pixel displays a black image. For example, the black data voltage can correspond to the minimum gray level (e.g., zero gray level). For example, the test control unit 120 can incrementally increase the temporary black data voltage to check whether the brightness of the black image is below a threshold. When the brightness of the black image drops below the threshold, the test control unit 120 can determine the corresponding temporary black data voltage as the black data voltage. Since the brightness measurement time of the optical system 110 decreases as the brightness of the displayed image increases, it is advantageous to test the temporary black data voltage by gradually increasing it from the minimum to the maximum value. The black data voltage can be set differently or the same for each color.

[0117] Next, the test control unit 120 can set the difference between the anode initialization voltage VAINT and the first power supply voltage ELVSS during the address scan cycle AS (step S103). Since the voltage value of the first power supply voltage ELVSS has been set in step S101, the amplitude of the anode initialization voltage VAINT can be determined through this step S103.

[0118] The smaller the difference between the anode initialization voltage VAINT and the first supply voltage ELVSS, the easier it is to achieve low grayscale representation. For example, black dithering can be reduced. On the other hand, a larger difference has the advantage of increasing the response speed of pixel PXij and reducing temperature sensitivity.

[0119] For example, the test control unit 120 can incrementally decrease the temporary difference to check if the brightness of the black image has decreased below a threshold. When the brightness of the black image decreases below the threshold, the test control unit 120 can determine the corresponding temporary difference as the difference between the anode initialization voltage VAINT and the first power supply voltage ELVSS. Since the brightness measurement time of the optical system 110 decreases as the brightness of the displayed image increases, it is advantageous to test the temporary difference by gradually decreasing it from a maximum value to a minimum value.

[0120] As described above, the anode initialization voltage VAINT can be set differently for each of the first to third colors. In another example, the anode initialization voltage VAINT can be set to be the same for two colors and different for the remaining colors.

[0121] Next, the test control unit 120 can set the initialization voltage VINT (step S104). Refer to... Figures 9 to 11 The implementation method is described in more detail for step S104. In this implementation, according to step S104, in addition to the initialization voltage VINT, a white data voltage corresponding to the white grayscale level (e.g., the highest grayscale level) can also be set. The white data voltage can be set differently or the same for each color.

[0122] Next, the test control unit 120 can set the data voltage (step S105). At this time, the data voltage for each color can be determined within the corresponding data voltage range. For example, a first pixel emitting light of the first color can have a data voltage determined within the first data voltage range. A second pixel emitting light of the second color can have a data voltage determined within the second data voltage range. A third pixel emitting light of the third color can have a data voltage determined within the third data voltage range. The minimum value (minimum data voltage) and maximum value (maximum data voltage) of the first to third data voltage ranges can be different or the same. For example, the first to third data voltage ranges can be limited by the relationship between each light-emitting element (LD) and the driving transistor.

[0123] The data voltage can be set to be greater than or substantially equal to the test data voltage corresponding to the target brightness (e.g., white brightness), the target color coordinates (e.g., white color coordinates), and the final test initialization voltage set in the previous step S104. These test data voltages can be set as white data voltages. For example, the data voltage for each color can be set to be greater than or substantially equal to the white data voltage determined in step S104. Furthermore, the data voltage for each color can also be set to be less than or substantially equal to the black data voltage determined in step S102.

[0124] Next, the test control unit 120 can set the bias voltage VOBS of the self-scan cycle SS (step S106). For example... Figures 3 to 6 As shown, flickering may occur because the address scan cycle AS and the self-scan cycle SS are driven by different methods. In step S106, the bias voltage VOBS can be set by repeatedly setting and checking the bias voltage VOBS to minimize flickering.

[0125] Next, in step S107, the test control unit 120 can set the difference between the anode initialization voltage VAINT and the first power supply voltage ELVSS during the self-scan cycle SS. In other words, by setting the difference in step S107 independently of the difference set in step S103, differences in brightness, color coordinates, etc., caused by changes in display frequency can be minimized.

[0126] Figure 9 This is a diagram illustrating the steps of setting the initialization voltage according to an embodiment of the present disclosure.

[0127] First, the test control unit 120 can select the lowest minimum data voltage among the minimum data voltages in the first data voltage range to the third data voltage range as the fixed test data voltage (step S1041a). For example, if the minimum data voltage in the first data voltage range for the first color is 0.7V, the minimum data voltage in the second data voltage range for the second color is 0.6V, and the minimum data voltage in the third data voltage range for the third color is 0.5V, then the test control unit 120 can select 0.5V for the third color as the fixed test data voltage.

[0128] Next, the test control unit 120 can change the test initialization voltage and test data voltage of pixels of other colors (e.g., the first color and the second color) except for the color corresponding to the fixed test data voltage (e.g., the third color) to find the final test initialization voltage corresponding to the target brightness and target color coordinates, and set the final test initialization voltage as the initialization voltage VINT (steps S1042a, S1043a).

[0129] For example, the test control unit 120 can change the test initialization voltage and test data voltage of pixels of other colors to search for a voltage set corresponding to the target brightness and target color coordinates (step S1042a). Here, the target brightness can be white brightness, and the target color coordinates can be white coordinates. For example, the test data voltage for the third color can be set as a fixed variable, and the test data voltage and test initialization voltage for the first and second colors can be set as input variables to search for a voltage set corresponding to the target brightness and target color coordinates. Each in the voltage set can include test data voltages and test initialization voltages for the first to third colors. The test data voltage for the third color for each in the voltage set can be the same (fixed test data voltage).

[0130] Next, the test control unit 120 can set the test initialization voltage of the voltage set with the maximum test initialization voltage in the searched voltage set as the final test initialization voltage (step S1043a). As described above, the final test initialization voltage can be set as the initialization voltage VINT. In this embodiment, the test data voltage and fixed test data voltage of the selected voltage set can be set as white data voltages.

[0131] A lower initialization voltage VINT is beneficial for achieving high brightness, while a higher initialization voltage is beneficial for improving ghosting. According to the implementation method, maximizing the initialization voltage VINT can reduce ghosting in the display device 10' while achieving high brightness.

[0132] According to embodiments of this disclosure, a voltage setting method is provided. This method sets (or determines) an initialization voltage in a display device by applying a voltage set (or a combination of test data voltage and test initialization voltage) to a pixel and checking whether the resulting brightness and color coordinates displayed by the pixel in the display device fall within a target range. The goal is to set the initialization voltage as high as possible for the target range of color coordinates and brightness to reduce afterimages. Figure 9 In this implementation, the data voltage varies for only two of the three colors displayed on the display device. By selecting the maximum initialization voltage with brightness and color coordinates within the target range and setting it as the initialization voltage for the display device, afterimages can be minimized.

[0133] Figure 10 This is a diagram illustrating the steps for setting an initialization voltage according to an embodiment of the present disclosure.

[0134] First, the test control unit 120 can select the lowest minimum data voltage among the minimum data voltages in the first data voltage range to the third data voltage range as the fixed test data voltage (step S1041b). For example, if the minimum data voltage in the first data voltage range for the first color is 0.7V, the minimum data voltage in the second data voltage range for the second color is 0.6V, and the minimum data voltage in the third data voltage range for the third color is 0.5V, then the test control unit 120 can select 0.5V for the third color as the fixed test data voltage.

[0135] Next, the test control unit 120 changes the test initialization voltage and test data voltage of pixels of other colors (e.g., the first color and the second color) except for the color corresponding to the fixed test data voltage (e.g., the third color) to find the final test initialization voltage corresponding to the target brightness and target color coordinates, and can set the final test initialization voltage as the initialization voltage VINT (steps S1042b, S1043b, S1044b, S1045b, S1046b, S1047b, S1048b).

[0136] For example, the test control unit 120 can set an initial test initialization voltage and change the test data voltage of the pixels of other colors (step S1042b). For example, the test control unit 120 can set the initial test initialization voltage to -4V. Furthermore, the test control unit 120 can change the test data voltage of the pixels of the first and second colors. At this time, the test control unit 120 can calculate the test data voltages that are expected to achieve the target brightness (white brightness) and target color coordinates (white coordinates) based on the fixed test data voltage (e.g., 0.5V) and the initial test initialization voltage (e.g., -4V).

[0137] Based on the fixed test data voltage, the initial test initialization voltage, and the test data voltage calculated in step S1042b, the display device 10' can display an image. The optical system 110 can provide the current brightness and current color coordinates of these images to the test control unit 120. Therefore, the test control unit 120 can check whether the current brightness and current color coordinates fall within the target range (step S1043b).

[0138] If the current brightness and current color coordinates are not within the target range, the test control unit 120 can execute step S1042b again to change the test data voltage of the remaining color pixels. At this time, the initial test initialization voltage and fixed test data voltage can be maintained. The target range may include the brightness range corresponding to the target brightness and the color coordinate range corresponding to the target color coordinates.

[0139] If the current brightness and current color coordinates fall within the target range, the test control unit 120 can check whether the test data voltages of the pixels of other colors fall within the corresponding data voltage ranges (step S1044b). For example, if the other colors are the first color and the second color, the corresponding data voltage ranges can be the first data voltage range and the second data voltage range.

[0140] If the test data voltages of pixels of other colors fall within the corresponding data voltage range, the test control unit 120 can set the current test initialization voltage as the final test initialization voltage (step S1047b). In this embodiment, the test data voltage corresponding to the final test initialization voltage and the fixed test data voltage can be set to the white data voltage.

[0141] However, if the test data voltage of the pixels of other colors does not fall within the corresponding data voltage range, the test control unit 120 can reduce the current test initialization voltage (step S1045b). For example, the test control unit 120 can reduce the current test initialization voltage by 0.5 volts.

[0142] The test control unit 120 can check whether the current test initialization voltage is greater than the minimum initialization voltage (step S1046b). For example, the minimum initialization voltage can be -6V.

[0143] If the current test initialization voltage is greater than the minimum initialization voltage, the test control unit 120 can again execute step S1042b to change the test data voltage of the pixels of other colors.

[0144] If the current test initialization voltage is less than the minimum initialization voltage, the test control unit 120 can determine that the display device 10' is defective (step S1048b).

[0145] According to the embodiment, by confirming in step S1044b that the test data voltage falls within the corresponding data voltage range, the data voltage margin of the display device 10' can be satisfied. Furthermore, by setting the initialization voltage VINT of the display device 10' as high as possible, it becomes advantageous to reduce redundant images.

[0146] according to Figure 10 In one embodiment, a voltage setting method is provided, which sets (or determines) the initialization voltage in a display device by applying a voltage set (or a combination of test data voltage and test initialization voltage) to a pixel and checking whether the resulting brightness and color coordinates displayed by the pixel in the display device fall within a target range. Figure 10 The method reduces redundant images while ensuring that the test data voltage used is within the data voltage range. Figure 10 The method also changes the data voltage of only two of the three colors displayed on the display device. Figure 9 Unlike other methods, in this approach, the initialization voltage is tested starting at a high level and then decreasing until the color coordinates and brightness fall within the target range, at which point the initialization voltage is set. This ensures that the highest possible initialization voltage is used to minimize afterimages.

[0147] Figure 11 This is a diagram illustrating the steps of setting the initialization voltage according to an embodiment of the present disclosure.

[0148] First, the test control unit 120 can set the initial test initialization voltage (step S1041c). For example, the test control unit 120 can set the initial test initialization voltage to -4 volts.

[0149] Next, the test control unit 120 can change the test data voltages of the first pixel, the second pixel, and the third pixel, as well as the initial test initialization voltage, to find the final test initialization voltage corresponding to the target brightness and target color coordinates, and set the final test initialization voltage as the initialization voltage VINT (steps S1042c, S1043c, S1044c, S1045c, S1046c, S1047c, S1048c). The final test initialization voltage can be lower than or substantially equal to the initial test initialization voltage. In this embodiment, there is no fixed test data voltage.

[0150] For example, the test control unit 120 can change the test data voltage of the pixels of the first color to the third color (step S1042c). At this time, the test control unit 120 can calculate the test data voltage to achieve the desired target brightness (white brightness) and target color coordinates (white coordinates) based on the initial test initialization voltage (e.g., -4V).

[0151] Based on the initial test voltage and the test data voltage calculated in step S1042c, the display device 10' can display an image. The optical system 110 can provide the current brightness and current color coordinates of these images to the test control unit 120. Therefore, the test control unit 120 can check whether the current brightness and current color coordinates fall within the target range (step S1043c).

[0152] If the current brightness and current color coordinates are not within the target range, the test control unit 120 can execute step S1042c of changing the test data voltage again. At this time, the initial test initialization voltage can be maintained. The target range may include the brightness range corresponding to the target brightness and the color coordinate range corresponding to the target color coordinates.

[0153] If the current brightness and current color coordinates fall within the target range, the test control unit 120 can check whether the test data voltage of the pixel falls within the corresponding data voltage range (step S1044c). For example, the corresponding data voltage range can be a first data voltage range, a second data voltage range, and a third data voltage range.

[0154] If the test data voltage falls within the corresponding data voltage range, the test control unit 120 can set the current test initialization voltage as the final test initialization voltage (step S1047c). In this embodiment, the test data voltage corresponding to the final test initialization voltage can be set as the white data voltage.

[0155] However, if the test data voltage does not fall within the corresponding data voltage range, the test control unit 120 can reduce the current test initialization voltage (step S1045c). For example, the test control unit 120 can reduce the current test initialization voltage by 0.5 volts.

[0156] The test control unit 120 can check whether the current test initialization voltage is greater than the minimum initialization voltage (step S1046c). For example, the minimum initialization voltage can be -6V.

[0157] If the current test initialization voltage is greater than the minimum initialization voltage, the test control unit 120 can again execute step S1042c of changing the test data voltage of the pixels of other colors.

[0158] If the current test initialization voltage is less than the minimum initialization voltage, the test control unit 120 can determine that the display device 10' is defective (step S1048c).

[0159] According to the embodiment, by confirming in step S1044c that the test data voltage falls within the corresponding data voltage range, the data voltage margin of the display device 10' can be satisfied. Furthermore, by setting the initialization voltage VINT of the display device 10' as high as possible, it becomes advantageous to minimize afterimages.

[0160] according to Figure 11 In one embodiment, a voltage setting method is provided, which sets (or determines) the initialization voltage in a display device by applying a voltage set (or a combination of test data voltage and test initialization voltage) to a pixel and checking whether the resulting brightness and color coordinates displayed by the pixel in the display device fall within a target range. Figure 11 This method reduces redundant images while ensuring that the test data voltage used is within the data voltage range. Figure 9 and Figure 10 The methods are different. Figure 11 The method changes the data voltages used to display all three colors on the display device. Figure 10 The method is similar; throughout this process, the initialization voltage is tested and started at a high level and then decreased until the color coordinates and brightness fall within the target range, at which point the initialization voltage is set. This ensures that the highest possible initialization voltage is used to minimize afterimages.

[0161] Figure 12 This is a block diagram of an electronic device according to an embodiment. (Reference) Figure 12 The electronic device 10ET according to the embodiment may include a display module 11ET, a processor 12ET, a memory 13ET, and a power module 14ET. The display module 11ET may also be represented by a display device.

[0162] The processor 12ET may include at least one of a central processing unit (CPU), an application processor (AP), a graphics processing unit (GPU), a communication processor (CP), an image signal processor (ISP), and a controller. In embodiments, from a functional or structural perspective, the processor 12ET may be divided into two or more processors. For example, the processor 12ET may include a main processor and a second processor, the main processor having the form of a first driver chip including the central processing unit, and the second processor having the form of a second driver chip including a controller that receives image signals from the main processor and processes the image signals to meet the interface specifications of the display module 11ET. The processor 12ET can provide image data. The display module 11ET can display images based on the grayscale levels of the image data.

[0163] The memory 13ET may include at least one of non-volatile memory and volatile memory. The memory 13ET may store data information required for the operation of the processor 12ET or the display module 11ET. When the processor 12ET executes an application stored in the memory 13ET, image data signals and / or input control signals may be transmitted to the display module 11ET, and the display module 11ET may process the received signals to output image information via the display screen.

[0164] The power module 14ET may include a power module such as a power adapter or battery cell, and a power conversion module that converts the power supplied by the power module to generate the power required for the operation of the electronic device 10ET. The power conversion performed by the power conversion module may include, but is not limited to, DC-DC conversion, AC-DC conversion, and DC-AC conversion.

[0165] The electronic device 10ET may also include an input module 15ET, an output module 16ET, and / or a communication module 17ET.

[0166] Input module 15ET can provide input information to processor 12ET and / or display module 11ET. Input module 15ET may include physical buttons, keyboard, microphone, and various sensor modules. Examples of sensor modules may include touch sensors, pressure sensors, proximity sensors, position sensors, digitizers, motion recognition sensors, camera sensors, light sensors, photoelectric sensors, temperature sensors, and biosensors such as blood pressure sensors, blood glucose sensors, electrocardiogram sensors, and heart rate sensors.

[0167] The output module 16ET can be used to receive information other than the image received from the processor 12ET and provide it to the user. Examples of the output module 16ET may include an acoustic module, a haptic module, a light-emitting module, and other functional modules specific to electronic devices (e.g., a cooling module in a refrigerator).

[0168] The communication module 17ET is responsible for sending and receiving information between the electronic device 10ET and external devices, and may include a receiving section and a transmitting section. The communication module 17ET may include, for example, a mobile communication module, a Wi-Fi module, or Bluetooth. ® Various wireless communication modules or various wired communication modules.

[0169] At least one of the above-described configurations of electronic device 10ET may be included in the display device according to the above embodiments. Furthermore, some of the individual modules functionally contained in a single module may be included in the display device, and other modules may be provided separately from the display device. For example, the display device may include display module 11ET, while processor 12ET, memory 13ET, and power module 14ET may be provided as other devices in electronic device 10ET besides the display device. As another example, power module 14ET may be provided in the display device, and processor 12ET and memory 13ET may be provided in electronic device 10ET external to the display device, without limiting the above examples.

[0170] Figures 13 to 15 These are schematic diagrams of electronic devices according to various embodiments. Figures 13 to 15 Examples of various electronic devices with display devices according to various embodiments are shown.

[0171] Figure 13 Examples of electronic devices are shown, including a smartphone 10_1a, a tablet computer 10_1b, a laptop computer 10_1c, a TV 10_1d, and a monitor 10_1e.

[0172] In addition to the display module 11ET, the smartphone 10_1a may also include an input module such as a touch sensor and a communication module. The smartphone 10_1a can process information received via the communication module or other input modules and display the information via the display module of the display device.

[0173] Similar to the smartphone 10_1a, the tablet computer 10_1b, laptop computer 10_1c, TV 10_1d, and monitor 10_1e may also include a display module and an input module, and in some cases, a communication module.

[0174] Figure 14 An example of an electronic device including a display module being applied to a wearable electronic device is shown. The wearable electronic device may be smart glasses 10_2a, a head-mounted display 10_2b, a smartwatch 10_2c, etc.

[0175] The smart glasses 10_2a and the head-mounted display 10_2b may include a display module for projecting and displaying images and a reflector for reflecting the projected display images and providing them to the user's eyes, thereby providing the user with a virtual reality or augmented reality view.

[0176] The smartwatch 10_2c may include a biometric sensor as an input device and may provide the user with biometric information identified by the biometric sensor via a display module.

[0177] Figure 15 An example of an electronic device including a display module being applied to a vehicle is shown. For example, the electronic device 10_3 can be applied to the vehicle's dashboard, center console, etc., or to a central information display (CID) placed on the vehicle's dashboard, or to an interior mirror display that replaces the side mirrors.

[0178] Although not shown, the electronic device with a display module according to the embodiments can include not only devices such as billboards and game consoles that focus on a display screen, but also various household appliances that display information via the display module, such as refrigerators, washing machines, dryers, air conditioners, robotic vacuum cleaners, etc. Furthermore, if the display module has the function of transmitting light, it can be applied to electronic devices such as transparent display devices that simultaneously display a background and an image, or smart windows. The types of electronic devices according to the embodiments are not limited to the examples above, and various other electronic devices not shown can be applied.

[0179] The accompanying drawings and detailed description provided above are merely examples of this disclosure and are intended to illustrate its purpose, and are not intended to limit or restrict the scope of the disclosure as claimed in the appended claims. Therefore, those skilled in the art will understand that many variations and implementations are possible.

Claims

1. A voltage setting method for a display device, comprising: A plurality of pixels are provided, the plurality of pixels including: a plurality of first pixels that emit light of a first color in response to a data voltage within a first data voltage range; a plurality of second pixels that emit light of a second color in response to a data voltage within a second data voltage range; and a plurality of third pixels that emit light of a third color in response to a data voltage within a third data voltage range; and Set an initialization voltage that is commonly applied to the gate electrode of the driving transistors included in the plurality of pixels. Setting the initial voltage includes: The lowest minimum data voltage among the minimum data voltages in the first data voltage range to the third data voltage range is selected as the fixed test data voltage; The test data voltage and test initialization voltage of pixels among the plurality of pixels of colors other than the color corresponding to the fixed test data voltage are changed to find the final test initialization voltage corresponding to the target brightness and target color coordinates; and Set the final test initialization voltage to the initialization voltage.

2. The method according to claim 1, further comprising: Set the data voltage of the plurality of pixels, wherein, The data voltage of the plurality of pixels is set to be greater than or equal to the test data voltage corresponding to the target brightness, the target color coordinates, and the final test initialization voltage.

3. The method according to claim 1, wherein, Setting the final test initialization voltage to the initialization voltage includes: Change the test initialization voltage and the test data voltage of the pixels among the plurality of pixels of the remaining colors to search for a voltage set corresponding to the target brightness and the target color coordinates; and The test initialization voltage of the voltage set with the largest test initialization voltage in the searched voltage set is set as the final test initialization voltage.

4. The method according to claim 1, wherein, Setting the final test initialization voltage to the initialization voltage includes: Set an initial test initialization voltage, and change the test data voltage of the pixels among the plurality of pixels of the remaining colors; Check if the current brightness and current color coordinates fall within the target range; and If the current brightness and the current color coordinates do not fall within the target range, then the test data voltage of the pixel among the plurality of pixels of the remaining colors is changed again.

5. The method according to claim 4, wherein, Setting the final test initialization voltage to the initialization voltage also includes: If the current brightness and the current color coordinates fall within the target range, then check whether the test data voltage of the pixels among the plurality of pixels of the remaining colors falls within the corresponding data voltage range; and If the test data voltage of the pixel among the plurality of pixels of the remaining colors falls within the corresponding data voltage range, then the current test initialization voltage is set as the final test initialization voltage.

6. The method according to claim 5, wherein, Setting the final test initialization voltage to the initialization voltage also includes: If the test data voltage of a pixel among the plurality of pixels of the remaining colors does not fall within the corresponding data voltage range, then the current test initialization voltage is reduced.

7. The method according to claim 6, wherein, Setting the final test initialization voltage to the initialization voltage also includes: Check whether the current test initialization voltage is greater than the minimum initialization voltage, and If the current test initialization voltage is greater than the minimum initialization voltage, then the test data voltage of the pixel among the plurality of pixels of the remaining colors is changed again.

8. The method according to claim 7, wherein, Setting the final test initialization voltage to the initialization voltage also includes: If the current test initialization voltage is less than the minimum initialization voltage, the display device is determined to be defective.

9. A voltage setting method for a display device, comprising: A plurality of pixels are provided, the plurality of pixels including: a plurality of first pixels that emit light of a first color in response to a data voltage within a first data voltage range; a plurality of second pixels that emit light of a second color in response to a data voltage within a second data voltage range; and a plurality of third pixels that emit light of a third color in response to a data voltage within a third data voltage range; and Set an initialization voltage that is commonly applied to the gate electrode of the driving transistors included in the plurality of pixels. Setting the initial voltage includes: Set the initial test initialization voltage; By changing the test data voltage of the multiple pixels and the initial test initialization voltage, a final test initialization voltage corresponding to the target brightness and target color coordinates is found; and Set the final test initialization voltage to the initialization voltage. Wherein, the final test initialization voltage is less than or equal to the initial test initialization voltage.

10. The method according to claim 9, wherein, Setting the final test initialization voltage to the initialization voltage includes: Change the test data voltage of the plurality of pixels; Check if the current brightness and current color coordinates fall within the target range; and If the current brightness and the current color coordinates do not fall within the target range, then the test data voltage is changed again.

11. The method according to claim 10, wherein, Setting the final test initialization voltage to the initialization voltage also includes: If the current brightness and the current color coordinates fall within the target range, then check whether the test data voltages of the plurality of pixels fall within the corresponding data voltage range; and If the test data voltage falls within the corresponding data voltage range, then the current test initialization voltage is set to the final test initialization voltage.

12. The method according to claim 11, wherein, Setting the final test initialization voltage to the initialization voltage also includes: If the test data voltage does not fall within the corresponding data voltage range, then the current test initialization voltage is reduced.

13. The method according to claim 12, wherein, Setting the final test initialization voltage to the initialization voltage also includes: Check whether the current test initialization voltage is greater than the minimum initialization voltage; and If the current test initialization voltage is greater than the minimum initialization voltage, then the test data voltage is changed again.

14. The method according to claim 13, wherein, Setting the final test initialization voltage to the initialization voltage also includes: If the current test initialization voltage is less than the minimum initialization voltage, the display device is determined to be defective.

15. An electronic device comprising: A display device includes a plurality of pixels, the plurality of pixels including: a plurality of first pixels that emit light of a first color in response to a data voltage within a first data voltage range; a plurality of second pixels that emit light of a second color in response to a data voltage within a second data voltage range; and a plurality of third pixels that emit light of a third color in response to a data voltage within a third data voltage range; and A voltage setting device is configured to set the voltage of the display device. The voltage setting device includes: A test control unit is configured to provide a test voltage to the display device so that the display device can display an image; and An optical system configured to measure the brightness and color coordinates of the image, wherein, The test voltage includes the test initialization voltage and the test data voltage. The voltage of the display device is an initialization voltage commonly applied to the gate electrodes of the driving transistors included in the plurality of pixels, and The test control unit is also configured to: The lowest minimum data voltage among the minimum data voltages in the first data voltage range to the third data voltage range is selected as the fixed test data voltage. The test initialization voltage and the test data voltage of the plurality of pixels of colors other than those corresponding to the fixed test data voltage are changed to find the final test initialization voltage corresponding to the target brightness and target color coordinates. Set the final test initialization voltage to the initialization voltage.

16. The electronic device according to claim 15, wherein, The test control unit is also configured to set the data voltage of the plurality of pixels, and The data voltage of the plurality of pixels is set to be greater than or equal to the test data voltage corresponding to the target brightness, the target color coordinates, and the final test initialization voltage.

17. The electronic device according to claim 15, wherein, The test control unit is also configured to: By changing the test initialization voltage and the test data voltage of the plurality of pixels of the remaining colors, a voltage set corresponding to the target brightness and the target color coordinates is searched. The test initialization voltage of the voltage set with the largest test initialization voltage in the searched voltage set is set as the final test initialization voltage.

18. The electronic device according to claim 15, wherein, The test control unit is also configured to: Set the initial test voltage, and change the test data voltage of the plurality of pixels of the remaining colors. Check if the current brightness and current color coordinates fall within the target range, and If the current brightness and the current color coordinates do not fall within the target range, then the test data voltage of the plurality of pixels of the remaining colors is changed again.

19. The electronic device according to claim 18, wherein, The test control unit is also configured to: If the current brightness and the current color coordinates fall within the target range, then check whether the test data voltages of the plurality of pixels of the remaining colors fall within the corresponding data voltage range, and If the test data voltage of the plurality of pixels of the remaining colors falls within the corresponding data voltage range, then the current test initialization voltage is set as the final test initialization voltage.

20. The electronic device according to claim 19, wherein, The test control unit is further configured to reduce the current test initialization voltage if the test data voltage of the plurality of pixels of the remaining colors does not fall within the corresponding data voltage range.

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