Patent Application
20240119891
The present application claims priority to Korean patent application number 10-2022-0127325, filed on Oct. 5, 2022, the entire disclosure of which is incorporated by reference herein in its entirety.
Various embodiments of the present disclosure relate to an electronic device, and more particularly, to a display device and a method for monitoring the operation of pixels.
Various types of display devices have been developed. Examples include liquid crystal display devices and organic light emitting display devices. A display device includes a plurality of pixels which emit light to display images with various colors at various luminance levels. The pixels may include pixel circuits having substantially the same structure.
However, due to various reasons (e.g., process deviations, frequency of use of each pixel, degree of degradation of each pixel, etc.), mobility, threshold voltages of transistors of pixel circuits, and/or other electrical characteristics may differ from each other. In addition, light emitting diodes of the pixels may have deviations in threshold voltages thereof.
The information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
An embodiment of the present disclosure may provide a display device including: a display panel including first and second pixels respectively connected to first and second sensing lines; a sensing driver including a sensing channel shared by the first and the second sensing lines; and a controller configured to control the display panel and the sensing driver. The controller may be configured to: in a first time period, electrically disconnect the sensing channel from the first and the second sensing lines, and reflect electrical characteristics of the first and the second pixels in the first and the second sensing lines, respectively, as sensing voltages; and in a second time period, record the sensing voltages reflected in the first and the second sensing lines in the sensing channel by time-sharing.
The controller may be configured to: initialize the sensing channel before the sensing voltage reflected in the first sensing line is recorded in the sensing channel; and initialize the sensing channel before the sensing voltage reflected in the second sensing line is recorded in the sensing channel.
The sensing driver may further include a first switch and a second switch. An input node of the sensing channel may be connected to the first sensing line through the first switch, and may be connected to the second sensing line through the second switch. The first and the second switches may be turned off during the first time period.
The sensing channel may include a sampling capacitor connected to the input node. The sensing voltages reflected in the first and the second sensing lines may be recorded in the sampling capacitor by time-sharing.
The sensing channel may be configured to, in response to control signals from the controller, initialize the sampling capacitor before the sensing voltage reflected in the first sensing line is recorded in the sampling capacitor, and initialize the sampling capacitor before the sensing voltage reflected in the second sensing line is recorded in the sampling capacitor.
The sensing channel may include: a third switch configured to connect a first end of the sampling capacitor to the input node in response to a first control signal; a fourth switch configured to connect the first end of the sampling capacitor to an initialization voltage node in response to a second control signal; and a fifth switch configured to connect a second end of the sampling capacitor to a reference voltage node in response to a third control signal.
The sensing channel may further include a reference capacitor. A first end of the reference capacitor may be connected to the first end of the sampling capacitor. The second end of the sampling capacitor and a second end of the reference capacitor may form output ends of the sensing channel.
The display device may further include a data driver connected to the first and the second pixels through first and second data lines. The controller may control the data driver. The data driver may be configured to: apply a first reference data voltage to the first and the second pixels through the first and the second data lines in the first time period; and apply a second reference data voltage lower than the first reference data voltage to the first and the second pixels through the first and the second data lines in the second time period.
The display device may further include a scan driver configured to operate under control of the controller. The display panel may further include a first switch connected between the first pixel and the first sensing line, and a second switch connected between the second pixel and the second sensing line. The scan driver may be configured to transmit a sensing select signal to the first and the second switches and turn on the first and the second switches in the first time period, and turn off the first and the second switches before the second time period starts.
The display device may further include a scan driver configured to operate under control of the controller. The first and the second pixels may be respectively connected to first and second data lines. Each of the first and the second pixels may include a switching transistor configured to transmit, in response to a scan signal, a voltage signal received through the corresponding data line to the corresponding pixel. The scan driver may be configured to provide the scan signal, turn on the switching transistor in the first time period, and turn off the switching transistor before the second time period starts.
The sensing driver further comprises a data output circuit configured to output sensing data in response to each of the sensing voltages recorded in the sensing channel by time-sharing.
An embodiment of the present disclosure may provide a display device including: a display panel including a plurality of rows of pixels connected to a plurality of sensing lines, the plurality of sensing lines being grouped into sensing line groups; a sensing driver including sensing channels respectively allocated to the sensing line groups; and a controller configured to control the display panel and the sensing driver. The controller may be configured to: in a first time period, electrically disconnect the sensing channels from the plurality of sensing lines, and reflect electrical characteristics of the plurality of pixels in the plurality of sensing lines as sensing voltages; and in a second time period, record the sensing voltages of the sensing lines included in each of the sensing line groups in the corresponding sensing channel by timing-sharing.
The controller may be configured to, before each time the sensing voltages of the sensing lines included in each of the sensing line groups are recorded in the corresponding sensing channel by time-sharing, initialize the corresponding sensing channel.
The display device may further include a data driver connected to the plurality of pixels through a plurality of data lines. The controller may be configured to control the data driver. The data driver may be configured to: in the first time period, apply a first reference data voltage to the plurality of pixels through the plurality of data lines; and in the second time period, apply a second reference data voltage lower than the first reference data voltage to the plurality of pixels through the plurality of data lines.
The display device may further include a scan driver configured to operate under control of the controller. The display panel may further include a plurality of switches connected between the plurality of pixels and the plurality of sensing lines. The scan driver may be configured to transmit a sensing select signal to the plurality of switches, turn on the plurality of switches in the first time period, and turn off the plurality of switches before the second time period starts.
The display device may further include a scan driver configured to operate under control of the controller. The plurality of pixels may be respectively connected to a plurality of data lines. Each of the plurality of pixels may include a switching transistor configured to transmit, in response to a scan signal, a voltage signal received through the corresponding data line to the corresponding pixel. The scan driver may be configured to provide the scan signal, turn on the switching transistor in the first time period, and turn off the switching transistor before the second time period starts.
An embodiment of the present disclosure may provide a method of performing an operation of sensing pixels. First and second pixels among the pixels are respectively connected to first and second sensing lines,
The method include: reflecting, in a first time period, electrical characteristics of the first and the second pixels in the first and the second sensing lines, respectively, as sensing voltages; electrically disconnecting a sensing channel shared by the first and the second sensing lines from the first and the second sensing lines while the sensing voltages are reflected in the first and the second sensing lines; and in a second time period, connecting the first and the second sensing lines to the sensing channel by time-sharing, and successively recording the sensing voltages reflected in the first and the second sensing lines in the sensing channel.
The method may further include: initializing the sensing channel before the sensing voltage reflected in the first sensing line is recorded in the sensing channel; and initializing the sensing channel before the sensing voltage reflected in the second sensing line is recorded in the sensing channel.
As the present disclosure allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present disclosure to particular modes of practice, and it is to be appreciated that all changes, equivalents, and substitutes that do not depart from the spirit and technical scope of the present disclosure are encompassed in the present disclosure.
It will be understood that, although the terms “first”, “second”, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For instance, a first element discussed below could be termed a second element without departing from the teachings of the present disclosure. Similarly, the second element could also be termed the first element. In the present disclosure, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms “comprise”, “include”, “have”, etc. when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or combinations of them but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or combinations thereof.
Features of the present disclosure, and methods for achieving the same will be cleared with reference to embodiments described later in detail together with the accompanying drawings. However, it is to be noted that the present disclosure is not limited to the embodiments but can be embodied in various other ways. In this specification, “connected/coupled” refers to one component not only directly coupling another component but also indirectly coupling another component through an intermediate component. In addition, in an embodiment of the present disclosure, the term “connection” between two components may embrace electrical connection and physical connection.
In accordance with one or more embodiments, a display device is provided in which two sensing lines share a single sensing channel (in order to reduce the surface area of the display device). Respective ones of the sensing lines carry voltages that reflect electrical characteristics of pixels under different sensing conditions (or different sensing schemes). The voltages may be selectively transmitted to a shared sensing channel to generate sensing data. Through these features, deterioration in the reliability of a sensing operation may be prevented, and any influence that may adversely affect a compensation value to be applied to driving conditions may also be prevented. As a result, the reliability of the display device may be significantly improved.
Referring to
The display panel 110 may be one of various types of display panels. Examples include a light emitting diode (LED) panel and a liquid crystal display panel (LCD). Hereinafter, there will be described the case where the pixels include light emitting diodes, and the display panel 110 is a light emitting diode panel. However, embodiments are not limited thereto, and the display panel 110 may be any one of other types of display panels.
The controller 120 may receive an image signal RGB and a control signal CTRL from an external device. The controller 120 may convert a data format of the image signal RGB to a format suitable for interface with the data driver 140, and generate an image data signal DATA. The controller 120 may output a scan control signal SCCS, a data control signal DCS, and a sensing control signal SSCS based on the control signal CTRL.
The scan driver 130 may be connected to rows of pixels of the display panel 110 by the scan lines SCL. The scan driver 130 may apply scan signals to the scan lines SL in response to the scan control signal SCCS. Furthermore, the scan driver 130 may be connected to the rows of pixels of the display panel 110 by the sensing select lines SSL. During operations of sensing electrical characteristics of the pixels to be described in greater detail below, the scan driver 130 may apply a sensing select signal to the sensing select lines SSL in response to the scan control signal SCCS, and select each of the rows of pixels.
The data driver 140 may receive the data control signal DCS and the image data DATA from the controller 120. The data driver 140 may output analog voltage signals to the first to m-th data lines DL1 to DLm in response to the image data signal DATA. The analog voltage signals may correspond to grayscale values corresponding to the image data signal DATA. Hence, the analog voltage signals may be provided to the pixels of a row that receives a scan signal. The light emitting diodes of the corresponding pixels may emit light in response to the provided analog voltage signals.
The sensing driver 150 may receive the sensing control signal SSCS from the controller 120. The sensing driver 150 may be connected to columns of the pixels of the display panel 110 by first to m-th sensing lines SL1 to SLm. The sensing driver 150 may be configured to sense electrical characteristics of the pixels of a selected row through the first to m-th sensing lines SL1 to SLm in response to the sensing control signal SSCS, and generate sensing data SD.
Referring to
In accordance with one example, the first sensing line group SLG1 may include an odd sensing line SL1_1 and an even sensing line SL1_2. The odd sensing line SL1_1 may be connected to the first pixel PX1, and the even sensing line SL1_2 may be connected to the second pixel PX2. For example, the p-th sensing line group SLGp may include an odd sensing line SLp_1 and an even sensing line SLp_2. The odd sensing line SLp_1 may be connected to the m−1-th pixel PXm−1, and the even sensing line SLp_2 may be connected to the m-th pixel PXm. Here, p is an integer of m/2.
The display panel 110 may include switches SSW1_1, SSW1_2, SSWp_1, and SSWp_2 which respectively connect the first to m-th pixels PX1 to PXm to the corresponding sensing lines. The switch SSW1_1 may connect the first pixel PX1 to the odd sensing line SL1_1 of the first sensing line group SLG1 in response to a sensing select signal of the first sensing select line SSL1. The switch SSW1_2 may connect the second pixel PX2 to the even sensing line SL1_2 of the first sensing line group SLG1 in response to a sensing select signal. The switch SSWp_1 may connect the m−1-th pixel PXm−1 to the odd sensing line SLp_1 of the p-th sensing line group SLGp in response to a sensing select signal. The switch SSWp_2 may connect the m-th pixel PXm to the even sensing line SLp_2 of the p-th sensing line group SLGp in response to a sensing select signal.
Referring to
As illustrated in
An odd sensing select transistor SST1_1 and an even sensing select transistor SST1_2 may be provided as the switch SSW1_1 and the switch SSW1_2 of
Electrical characteristics of the first and second pixels PX1 and PX2 may be respectively reflected in signals (e.g., sensing voltages) of the odd and even sensing lines SL1_1 and SL1_2. A scan signal of the first scan line SCL1 and a sensing select signal of the first sensing select line SSL1 may be enabled to a first (e.g., high) logic level (hereinafter, a high level), so that a certain reference data voltage may be transmitted through the first and second data lines DL1 and DL2. In this case, a voltage obtained by subtracting a threshold voltage of the driving transistor T2 from the reference data voltage may be applied to a node between the driving transistor T2 and the light emitting diode LD as a sensing voltage. The sensing voltage may be transmitted to the sensing line through the corresponding sensing select transistor. As such, the sensing voltage may include information about electrical characteristics of each pixel, for example, information about the threshold voltage of the driving transistor T2, as described above.
The first to p-th sensing channels 211 to 21p may be operated under control of the controller 120 of
Each of the first to p-th sensing channels 211 to 21p may be configured to sequentially record, therein, sensing voltages reflected in the corresponding odd and even sensing lines. In embodiments, each of the first to p-th sensing channels 211 to 21p may include, for example, a sampling capacitor for recording a sensing voltage.
The sensing driver 200 may further include a line select switch connected between each of the odd and even sensing lines and the sensing channel that is shared by the odd and even sensing lines. An odd line select switch LSW1_1 may be connected between the odd sensing line SL1_1 of the first sensing line group SLG1 and the first sensing channel 211. An even line select switch LSW1_2 may be connected between the even sensing line SL1_2 of the first sensing line group SLG1 and the first sensing channel 211. Likewise, an odd line select switch LSWp_1 may be connected between the odd sensing line SLp_1 of the p-th sensing line group SLGp and the p-th sensing channel 21p. An even line select switch LSWp_2 may be connected between the even sensing line SLp_2 of the p-th sensing line group SLGp and the p-th sensing channel 21p. The odd line select switches LSW1_1 to LSWp_1 may be turned on or off in response to one or more select signals, e.g., in response to the same odd line select signal LSS1. The even line select switches LSW1_2 to LSWp_2 may be turned on or off in response to one or more select signals, e.g., in response to the same even line select signal LSS2.
In accordance with an embodiment of the present disclosure, when sensing voltages from the pixels are reflected in the sensing lines SL1_1 to SLp_1 and SL1_2 to SLp_2 of the first to p-th sensing line groups SLG1 to SLGp, the odd line select switches LSW1_1 to LSWp_1 and the even line select switches LSW1_2 and LSWp_2 are turned off. Thereafter, each of the first to p-th sensing channels 211 to 21p may be successively connected to the corresponding odd sensing line and the corresponding sensing line and record a corresponding sensing voltage therein. The first to p-th sensing channels 211 to 21p may be initialized before each writing operation is performed. Hence, even though each of the first to p-th sensing channels 211 to 21p is shared by the odd sensing line and the even sensing line of the corresponding sensing line group, sensing voltages may be recorded in the first to p-th sensing channels 211 to 21p through the odd sensing lines SL1_1 to SLp_1 and the even sensing lines SL1_2 to SLp_2 with relatively high reliability.
The switch circuit 220 may be connected to the first to p-th sensing channels 211 to 21p through the first to p-th channel output lines CHO1 to CHOp, respectively. The switch circuit 220 may successively connect each of the first to p-th channel output lines CHO1 to CHOp to the data output circuit 230 under control of the controller 120. As such, the switch circuit 220 allows the first to p-th sensing channels 211 to 21p to time-share the data output circuit 230.
The data output circuit 230 may obtain sensing voltages recorded in the first to p-th sensing channels 211 to 21p through the first to p-th channel output lines CHO1 to CHOp, and output sensing data SD according to the obtained voltages.
The sensing driver 200 may further include first to p-th initialization circuits 241 to 24p. The initialization circuits may control the voltage on the sensing lines to assume an initial (e.g., ground) value during a sensing operation for the display panel. The first to p-th initialization circuits 241 to 24p may receive a line initialization signal LINT from the controller 120. In response to the line initialization signal LINT, the first to p-th initialization circuits 241 to 24p may respectively initialize the first to p-th sensing line groups SLG1 to SLGp.
The odd and even line select signals LSS1 and LSS2, a channel initialization signal CHINT, and the line initialization signal LINT may be included in the sensing control signal SSCS of
Referring to
At operation S120, electrical characteristics of the first and second pixels PX1 and PX2 (refer to
At operation S130, the first sensing channel 211 is initialized in response to a channel initialization signal CHINT. In embodiments, the first sensing channel 211 may include a sampling capacitor (refer to “SAMC” of
At operation S140, a sensing voltage reflected in the odd sensing line SL1_1 is recorded in the first sensing channel 211, and a portion of sensing data SD is generated according to the recorded voltage.
At operation S150, the first sensing channel 211 is initialized in response to a channel initialization signal CHINT. In embodiments, the sampling capacitor of the first sensing channel 211 may be re-initialized.
At operation S160, a sensing voltage reflected in the even sensing line SL1_2 is recorded in the first sensing channel 211, and a portion of sensing data SD is generated according to the recorded voltage.
As such, when sensing voltages are reflected in the odd and even sensing lines SL1_1 and SL1_2, the first sensing channel 211 is electrically disconnected from the odd and even sensing lines SL1_1 and SL1_2. Thereafter, the first sensing channel 211 may be successively connected to the odd and even sensing lines SL1_1 and SL1_2 so that the corresponding sensing voltage can be recorded therein. This may be accomplished by selectively activating corresponding ones of the odd and even line select switches LSW1_1 and LSW1_2, as shown, for example, in the timing diagram of
Each time a recording operation is performed, the first sensing channel 211 may be first initialized before the recording operation. Hence, even though the first sensing channel 211 is shared by the odd and even sensing lines SL1_1 and SL1_2, the sensing voltages may be reflected in the odd and even sensing lines SL1_1 and SL1_2 with relatively high reliability, and may be recorded in the first sensing channel 211.
Referring to
An odd sensing line capacitor SLC1 may be connected between the odd sensing line SL1_1 and a ground node. The odd sensing line capacitor SLC1 may be for conceptually showing a capacitance or a parasitic capacitance that is included in the odd sensing line SL1_1. Alternatively, the odd sensing line capacitor SLC1 may be a physical element connected to the odd sensing line SL1_1. Likewise, an even sensing line capacitor SLC2 may be connected between the even sensing line SL1_2 and a ground node. Each of the odd sensing line capacitor SLC1 and the even sensing line capacitor SLC2 may have a relatively large predetermined capacitance, compared to that of a sampling capacitor SAMC or a reference capacitor REFC of the sensing channel 310.
The initialization circuit 340 may include first and second initialization switches ISW1 and ISW2. The first initialization switch ISW1 may be connected between an initialization power supply VINT and the odd sensing line SL1_1, and may be turned on in response to a line initialization signal LINT. The second initialization switch ISW2 may be connected between the initialization power supply VINT and the even sensing line SL1_2, and may be turned on in response to a line initialization signal LINT.
The odd line select switch LSW1_1 may be provided between the odd sensing line SL1_1 and an input node IN of the sensing channel 310, and may be turned on in response to an odd line select signal LSS1. The even line select switch LSW1_2 may be provided between the even sensing line SL1_2 and the input node IN, and may be turned on in response to an even line select signal LSS2.
The sensing channel 310 may include a sampling capacitor SAMC, a reference capacitor REFC, a sampling switch SAMSW, a comparison switch COMSW, and first to fourth switches SW1 to SW4. In other embodiments, storage devices different from the aforementioned capacitors may be used.
The sampling capacitor SAMC may include a first end connected to the input node IN, and a second end connected to a first output node ON1 of the sensing channel 310. The sampling switch SAMSW may be connected between the input node IN and the first end of the sampling capacitor SAMC, and may be turned on in response to a sampling signal SAM.
A first end of the reference capacitor REFC may be connected to the first end of the sampling capacitor SAMC. A second end of the reference capacitor REFC may be connected to a second output node ON2 of the sensing channel 310. The first and second output nodes ON1 and ON2 may form a first channel output line CHO1 of the sensing channel 310.
The comparison switch COMSW may be connected between the first end of the sampling capacitor SAMC and the first end of the reference capacitor REFC, and may be turned on in response to a comparison signal COM.
The first switch SW1 may be connected between the initialization power supply VINT and the first end of the sampling capacitor SAMC, and may transmit a voltage of the initialization power supply VINT to the first end of the sampling capacitor SAMC in response to a first capacitor initialization signal CPINT1. In other embodiments, the first switch SW1 may be omitted, and the third switch SW3 and the comparison switch COMSW may perform the function of the first switch SW1. In this case, when the comparison signal COM and the second capacitor initialization signal CPINT2 are enabled, the third switch SW3 and the comparison switch COMSW may transmit the voltage of the initialization power supply VINT to the first end of the sampling capacitor SAMC.
The second switch SW2 may be connected between the second end of the sampling capacitor SAMC and a reference power supply VREF, and may be turned on in response to a reference signal SREF. In one or more embodiments, the reference power supply VREF and the initialization power supply VINT may be substantially the same as each other. In other embodiments, the reference power supply VREF and the initialization power supply VINT may be different from each other. The third switch SW3 may be connected between the initialization power supply VINT and the first end of the reference capacitor REFC, and may be turned on in response to the second capacitor initialization signal CPINT2. The fourth switch SW4 may be between the reference power supply VREF and the second output node ON2, and may be turned on in response to the reference signal SREF.
The line initialization signal LINT, the odd and even line select signals LSS1 and LSS2, and the first and second capacitor initialization signals CPINT1 and CPINT2, the comparison signal COM, and the reference signal SREF may be included in the sensing control signal SSCS output from the controller 120 of
The switch circuit 320 may, for example, have the same configuration as that of the switch circuit 220 described with reference to
The data output circuit 330 may be operated under control of the controller 120. The data output circuit 330 may include an analog-to-digital converter (ADC) 331 and a data output unit 332. The ADC 331 may be connected to each channel output line, e.g., the first channel output line CHO1, through the switch circuit 320. The ADC 331 may perform an analog-to-digital conversion operation for voltage differences between the first and second output nodes ON1 and ON2 of the connected channel output line, and thus generate sensing data SD. The data output unit 332 may output the sensing data SD generated by the ADC 331. For example, the data output unit 332 may buffer the sensing data SD, and rearrange the buffered sensing data SD and output the rearranged sensing data SD to the controller 120.
Referring to
At the first time t1, a line initialization signal LINT is in a state of having been enabled to a first (e.g., high) logic level. As illustrated in
At a second time t2, the line initialization signal LINT is disabled to a second (e.g., low) logic level (hereinafter referred to as a low level). The initialization circuit 340 may separate the odd and even sensing lines SL1_1 and SL1_2 from the initialization power supply VINT. Referring to
A preset time elapses from the second time t2, and the time reaches a fourth time t4. A period between the first time t1 and the fourth time t4 may be defined as a sensing period SP provided to reflect electrical characteristics of the pixels of the display panel 110 (refer to
Referring again to
At a third time t3 before a recording period ORP (hereinafter, referred to as an odd recording period) for the sensing voltage reflected in the odd sensing line SL1_1, the channel initialization signal CHINT (refer to
Hence, as illustrated in
At the fourth time t4, the odd line select signal LSS1 is enabled to a high level, so that the sensing voltage of the odd sensing line SL1_1 is recorded in the sensing channel 310. As such, the time for which the odd line select signal LSS1 is enabled may be defined as an odd writing period ORP of the writing period RP.
Referring to
Referring again to
Referring to
The first end of the sampling capacitor SAMC and the first end of the reference capacitor REFC may be connected to each other through the comparison switch COMSW and thus have substantially the same voltage. For example, the voltage of the first end of the sampling capacitor SAMC may be reduced to the foregoing same voltage. The voltage of the first end of the reference capacitor REFC may be increased to the foregoing same voltage. The second end of the sampling capacitor SAMC and the second end of the reference capacitor REFC may be in a floating state. Hence, the voltage of the second end of the sampling capacitor SAMC may vary depending on a voltage change (e.g., a voltage reduction) on the first end of the sampling capacitor SAMC.
The voltage of the second end of the reference capacitor REFC may vary depending on a voltage change (e.g., a voltage reduction) on the first end of the sampling capacitor SAMC. The difference in voltage between the second end of the sampling capacitor SAMC and the second end of the reference capacitor REFC may be a difference between the sensing voltage recorded in the first end of the sampling capacitor SAMC and the initialization voltage VINT. The difference between the sensing voltage and the initialization voltage VINT may be output to the data output circuit 330 through the first channel output line CHO1.
Referring again to
At a seventh time t7, the even line select signal LSS2 is enabled to a high level, so that the sensing voltage of the even sensing line SL1_2 is recorded in the sensing channel 310. As such, the time for which the even line select signal LSS2 is enabled may be defined as an even writing period ERP of the writing period RP.
Referring to
Referring again to
Referring to
As such, the operation of connecting each of the odd and even sensing lines SL1_1 and SL1_2 to the sensing channel 310 and recording a corresponding sensing voltage in the sensing channel 310 may be performed after an initialization operation on the sensing channel 310 is performed. Hence, sensing voltages of the odd and even sensing lines SL1_1 and SL1_2 may be recorded in the sensing channel 310 under substantially the same conditions. Therefore, sensing data SD having enhanced reliability may be provided.
Referring to
Referring to
In one embodiment, the driving transistors T2 may be NMOS transistors. In this case, leakage current of the driving transistors T2 may be reduced by the second reference data voltage being lower than the first reference data voltage. For example, gate-source voltages of the driving transistors T2 may be reduced. Even though the even recording period ERP is later than the odd recording period ORP (for example, due to reduced leakage current of the driving transistors T2 during a time difference between the even recording period ERP and the odd recording period ORP), the sensing voltage of the even sensing line SL1_2 is allowed to be recorded in the sensing channel 310 (refer to
Referring to
Hence, before the recording period RP, each of the odd and even sensing lines SL1_1 and SL1_2 may be electrically separated from the corresponding pixel in the same manner, and thus may not receive a sensing voltage. In other words, each of the odd and even sensing lines SL1_1 and SL1_2 may receive a sensing voltage from the corresponding pixel during substantially the same time period. During the recording period RP, the odd and even sensing lines SL1_1 and SL1_2 are electrically separated from the first and second pixels PX1 and PX2, but due to the odd and even sensing line capacitors SLC1 and SCL2 (refer to
Referring to
The first sensing line SL1_1 may be connected to a first pixel PX1 through a switch SSW1_1. The second sensing line SL1_2 may be connected to a second pixel PX2 through a switch SSW1_2. The third sensing line SL1_3 may be connected to a third pixel PX3 through a switch SSW1_3. The fourth sensing line SL1_4 may be connected to a fourth pixel PX4 through a switch SSW1_4. The switches SSW1_1, SSW1_2, SSW1_3, and SSW1_4 may be turned on in response to a sensing select signal of the first sensing select line SSL1.
Referring to
The first to fourth sensing lines SL1_1, SL1_2, SL1_3, and SL1_4 may time-share the sensing channel 510. In this way, the sensing channel 510 may selectively receive signals (e.g., voltages) from the first to fourth sensing lines SL1_1, SL1_2, SL1_3, and SL1_4. To achieve the foregoing, the first to fourth sensing lines SL1_1, SL1_2, SL1_3, and SL1_4 may be connected to the sensing channel 510 through first to fourth line select switches LSW1_1 to LSW1_4, respectively. The first to fourth line select switches LSW1_1 to LSW1_4 may be turned on in response to first to fourth line select signals LSS1 to LSS4.
The sensing channel 510 may be operated under control of the controller 120 (refer to
The switch circuit 520 may be operated under control of the controller 120 (refer to
The initialization circuit 540 may initialize the first to fourth sensing lines SL1_1, SL1_2, SL1_3, and SL1_4 in response to a line initialization signal LINT. In
As such, a larger number of sensing lines than two sensing lines (odd and even sensing lines) may share a single sensing channel. As described with reference to
Various embodiments of the present disclosure may provide a display device and method for performing an operation of sensing pixels with enhanced reliability.
The effects of the present disclosure are not limited by the foregoing, and other various effects are anticipated herein. While various exemplary embodiments have been described above, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the present disclosure. Therefore, the embodiments disclosed in this specification are only for illustrative purposes rather than limiting the technical spirit of the present disclosure. The scope of the present disclosure must be defined by the accompanying claims. The embodiments may be combined to form additional embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0127325 | Oct 2022 | KR | national |
