This application claims priority to China Application Serial Number 202110250353.7, filed Mar. 8, 2021, which is herein incorporated by reference in its entirety.
The present disclosure relates to display technology. More particularly, the present disclosure relates to a display with pixel devices.
Conventional light emitting diode (LED) displays are driven by a passive matrix (PM) to control brightness and scale of pixels. However, requirements of ultra-fine pitches (UFP) of the displays increase nowadays, and the corresponding integrated circuits (IC) are highly integrated IC. The IC is required to be connected to multiple pixel devices and result in following problems. Circuit layouts of the displays are complicated and required multiple layers of printed circuit board (PCB) for implementation. When pitches are smaller than 0.6 mm, the process technology of driving IC and PCB faces a barrier, which is a disadvantage of marketing. PM driving lights LED by scanning with multitasking instantaneous operation, which easily results in strobe problems. A large amount of scanning requires high switching rate of the LED. Besides, connecting the multiple pixel devices requires high IC power. Therefore, how to design a new display to solve the above-mentioned shortcomings is an urgent issue for the industry.
The present disclosure provides a display. The display includes pixel driving circuits coupled to each other in series. The pixel driving circuits includes a first pixel device and a second pixel device. The first pixel device includes a first control circuit and a first light emitting circuit. The first control circuit is configured to generate a first light emitting signal according to a first clock signal and a data signal during a first period. The first light emitting circuit is coupled to the first control circuit and configured to emit light according to the first light emitting signal during a second period and a third period. The second pixel device includes a second control circuit and a second light emitting circuit. The second control circuit is configured to generate a second light emitting signal according to a second clock signal and the data signal during the second period. The second light emitting circuit is coupled to the second control circuit and configured to emit light according to the second light emitting signal during the third period. The first period to the third period are arranged continuously in order.
The present disclosure provides a display. The display includes pixel driving circuits coupled to each other in series. The pixel driving circuits includes a first pixel device and a second pixel device. The first pixel device includes a first control circuit and a first light emitting circuit. The first control circuit is configured to output a first bit of a data signal according to a first clock signal during a first period. The first light emitting circuit is coupled to the first control circuit and configured to emit light according to the first bit during a second period and a third period. The second pixel device includes a second control circuit and a second light emitting circuit. The second control circuit is configured to output the first bit according to a second clock signal during the second period. The second light emitting circuit is coupled to the second control circuit and configured to emit light according to the first bit during the third period and a fourth period. The first control circuit is further configured to output a second bit of the data signal according to the first clock signal during the fourth period. The first period to the fourth period are arranged continuously in order.
It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the disclosure as claimed.
Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It is noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.
The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
Further, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly.
The terms applied throughout the following descriptions and claims generally have their ordinary meanings clearly established in the art or in the specific context where each term is used. Those of ordinary skill in the art will appreciate that a component or process may be referred to by different names. Numerous different embodiments detailed in this specification are illustrative only, and in no way limit the scope and spirit of the disclosure or of any exemplified term.
It is worth noting that terms such as “first” and “second” used herein to describe various elements or processes aim to distinguish one element or process from another. However, the elements, processes and the sequences thereof should not be limited by these terms. For example, a first element could be termed as a second element, and a second element could be similarly termed as a first element without departing from the scope of the present disclosure.
In the following discussion and in the claims, the terms “comprising,” “including,” “containing,” “having,” “involving,” and the like are to be understood to be open-ended, that is, to be construed as including but not limited to. As used herein, instead of being mutually exclusive, the term “and/or” includes any of the associated listed items and all combinations of one or more of the associated listed items.
Reference will now be made in detail to the present embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
In some embodiments, the signal source 110 is configured to provide signals, such as high definition multimedia interface (HDMI) signal and/or digital visual interface (DVI) signal. The signal controller 120 is configured to operate according to the signals provided by the signal source 110, such as processing the signals by the technology of the serial peripheral interface bus (SPI), the inter-integrated circuit (I2C) and/or the low-voltage differential signaling (LVDS). In some embodiments, the signal controller 120 is implemented as an application specific integrated circuit (ASIC) and/or a field programmable gate array (FPGA).
In some embodiments, the timing controller 130 is configured to operate according to the signals processed by the signal controller 120. As shown by way of example in
In some embodiments, the display 140 is coupled to the timing controller 130 via the clock lines LC and the data lines LD. In some embodiments, the display 140 is configured to perform data writing operation and light emitting operation according to the clock signals CLK and the data signals DT.
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In some embodiments, the light emitting signal EM(1) corresponds to a result of the data signal DT(1) and the clock signal CLK(1) performing an AND operation, and the light emitting signal EM(2) corresponds to a result of the data signal DT(1) and the clock signal CLK(2) performing an AND operation.
In the embodiment shown in
In some previous approaches, a control circuit is coupled to multiple pixel devices to operate, such that errors may occurs easily, the circuit is complicated, and a printed circuit board (PCB) with larger number of layers is required for implementation.
Compared to the above approaches, in some embodiments of the present disclosure, active matrix (AM) is implemented. Each of the control circuits are connected to the corresponding light emitting circuit to operate, such as the control circuits 212 and 222 are connected to the light emitting circuit 214 and 224, respectively. As a result, the errors of currents and the complexity of the circuit are reduced, such that the circuit may be implemented by a PCB with less number of layers and costs are reduced correspondingly.
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The display may be implemented as an LED display, and the pixels may be constructed by LED. As shown by way of example in
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In some embodiments, the control circuits 212′ and 222′ may be implemented as integrated circuit (IC) or micro IC.
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In the embodiment shown in
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More specifically, during the period P31, the control circuit 212′ generates the light emitting signal EM(1), which corresponds to whether the light emitting element LR1 emits light during the period P35, according to the first data bit BT(1). For example, when the data signal DT(1) has an enable voltage level during the period P31, that is, when the first data bit BT(1) has a logic high level, the light emitting element LR1 emits light during the period P35. On the contrary, when the data signal DT(1) has an disable voltage level during the period P31, that is, when the first data bit BT(1) has a logic low level, the light emitting element LR1 does not emit light during the period P35. Further details of the data signal DT(1) and the first data bit BT(1) are described below in embodiments with reference to
Similarly, during the period P32, the control circuit 212′ generates, according to the first data bit BT(1), the light emitting signal EM(1) which corresponds to whether the light emitting element LG1 emits light during the period P35. During the period P33, the control circuit 212′ generates, according to the first data bit BT(1), the light emitting signal EM(1) which corresponds to whether the light emitting element LB1 emits light during the period P35.
During the period P34, the control circuit 212′ generates, according to the first data bit BT(1), the light emitting signal EM(1) which corresponds to a current level of a current received by the light emitting circuit 214′ when the light emitting circuit 214′ emits light. For example, when the data signal DT(1) has an enable voltage level during the period P34, that is, when the first data bit BT(1) has a logic high level, a current flowing through the light emitting circuit 214′ has a first current level during the period P35, such that at least one of the light emitting elements LR1, LB1 and LG1 that emits light has a first brightness level. On the contrary, when the data signal DT(1) has an disable voltage level during the period P34, that is, when the first data bit BT(1) has a logic low level, the current flowing through the light emitting circuit 214′ has a second current level during the period P35, such that at least one of the light emitting elements LR1, LB1 and LG1 that emits light has a second brightness level. The first current level is different from the second current level, and the first brightness level is different from the second brightness level. In other word, the control circuit 212′ adjusts the brightness level of the light emitting circuit 214′ during the period P35 according to the first data bit BT(1).
During the period P36, the clock signal CLK(1) has an enable voltage level VGH, such that the control circuit 212′ generates the light emitting signal EM(1) according to a second data bit BT(2) of the data signal DT(1). Correspondingly, during the period P37, the light emitting circuit 214′ performs a light emitting operation according to the light emitting signal EM(1) corresponding to the second data bit BT(2). In other word, the control circuit 212′ outputs the second data bit BT(2) during the period P36, and the light emitting circuit 214′ emits light according to the second data bit BT(2).
The operations of the control circuit 212′ and the light emitting circuit 214′ during the periods P36-P37 corresponding to the first data bit BT(1) are similar to the operations during the periods P31-P35 corresponding to the second data bit BT(2). For example, during the period P36, the control circuit 212′ generates, according to the second data bit BT(2), the light emitting signal EM(1) which corresponds to whether each of the light emitting elements LR1, LG1 and LB1 emits light during the period P37. Therefore, similar aspects of these operations are not repeated for brevity.
During the period P38, the control circuit 212′ and the light emitting circuit 214′ perform operations similar to those of the periods P36-P37 corresponding to each of a third data bit BT(3) to a (k−1)th data bit BT(k−1) in order, such that the light emitting circuit 214′ performs light emitting operations corresponding to each of the third data bit BT(3) to the (k−1)th data bit BT(k−1) in order. It is noted that k is a positive integer larger than one.
During the period P39-P310, the control circuit 212′ and the light emitting circuit 214′ perform operations similar to those of the periods P36-P37, such that the light emitting circuit 214′ performs light emitting operations corresponding to a kth data bit BT(k).
In some embodiments, a time length of the periods P31-P310 corresponds to a frame time, such as a frame time FT1 shown in
In some embodiments, the control circuit 212′ and the light emitting circuit 214′ perform operations similar to those of the frame time FT1 during a frame time FT2 after the frame time FT1. For example, during the periods P311-P312, the control circuit 212′ and the light emitting circuit 214′ perform a light emitting operation according to a first data bit BY(1) of the data signal DT(1). The first data bit BY(1) may be different from the first data bit BT(1).
In some previous approaches, during a frame time, a control circuit generates multiple light emitting signals corresponding to multiple data bits according to the data bits of a data signal, and then a light emitting circuit emits light. The approaches described above have lower flexibility, and the algorithm configured to operate the control circuit cannot be changed after the IC circuit design is finished.
Compared to the above approaches, in some embodiments of the present disclosure, a frame time is divided into multiple sub-periods, such as the periods P31-P35, P36-P37 and P39-P310. During each of the sub-periods, the control circuit 212′ and the light emitting circuit 214′ perform a light emitting operation according to the data bits BT(1)-BT(k). As a result, the ways of the light emitting circuit 214′ emitting light can be updated during each of the sub-periods. The embodiments of the present disclosure have higher flexibility, and the ways of emitting light can be changed as cooperating with different algorithms.
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In some embodiments, the control circuit 212′ is further configured to control a current IOUT flowing through the light emitting circuit 214′. In some embodiments, the light emitting circuit 214′ configured to be turned on when the current IOUT has a current level 11, and configured to be turned off when the current IOUT has a current level 12. In some embodiments, the current level 11 is higher than the current level 12. In some embodiments, the current level 12 is substantially equal to a zero current level.
In the embodiment shown in
Referring to
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More specifically, during the period P41, the control circuit 212′ generates the light emitting signal EM(1) according to the data signal DT(1) to control a light emitting operation of the light emitting element LR1 during the periods P45-P46. In the embodiment shown in
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In other embodiments, during the period P44, the data signal DT(1) has the disable voltage level VBL. Correspondingly, during the periods P45-P46, the current flowing through the light emitting circuit 214′ has a second current level, such that the light emitting circuit 214′ emits light with a second brightness level corresponding to the second current level.
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In some embodiments, the operations of the control circuit 222′ and the light emitting circuit 224′ according to the clock signal CLK(2) during the periods P45-P47 are similar to the operations of the control circuit 212′ and the light emitting circuit 214′ according to the clock signal CLK(1) during the periods P41-P46. Therefore, similar aspects of these operations are not repeated for brevity.
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In some embodiments, during the period P45, the fourth pulse of the clock signal CLK(2) corresponds to the current flowing through the light emitting circuit 224′ during the periods P46-P47. As shown by way of example in
In some embodiments, during the period P46, other pixel devices in the pixel device group 250 receive the first bit BT(1) of the data signal DT(1) according to the clock signals CLK(3)-CLK(n), and generate the light emitting signals EM(3)-EM(n) correspondingly to perform light emitting operations.
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In some embodiments, the operations of the control circuit 212′ and the light emitting circuit 214′ corresponding to the second data bit BT(2) during the periods P47-P49 are similar to the operations corresponding to the first data bit BT(1) during the periods P41-P46. Therefore, similar aspects of these operations are not repeated for brevity.
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In some embodiments, during the period P47, the light emitting circuit 214′ does not perform light emitting operations, and the light emitting circuit 224′ performs light emitting operations according to the first data bit BT(1).
In the embodiment shown in
In some embodiments, the operations of the control circuit 222′ and the light emitting circuit 224′ according to the clock signal CLK(2) during the periods P48-P49 are similar to the operations the control circuit 212′ and the light emitting circuit 214′ according to the clock signal CLK(1) during the periods P47-P48. Therefore, similar aspects of these operations are not repeated for brevity.
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In the embodiment shown in
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In some embodiments, during the period P49, other pixel devices in the pixel device group 250 receive the second bit BT(2) of the data signal DT(1) according to the clock signals CLK(3)-CLK(n), and generate the light emitting signals EM(3)-EM(n) correspondingly to perform light emitting operations.
In some embodiments, after the period P49, the pixel device group 250 perform light emitting operations according to the third data bit BT(3) to the kth data bit BT(k) in order.
In some previous approaches, a display includes multiple pixel devices, and the pixel devices are configured to receive a single data signal to emit light in turns according to corresponding scanning signals. In the approaches described above, a light emitting time of each of the pixel devices are shorter, a larger current is required to maintain the brightness of the display, and the display suffers from serious strobe problems.
Compared to the above approaches, in some embodiments of the present disclosure, the light emitting circuits in the display 200B emit light simultaneously, such as the light emitting circuits emitting light simultaneously during the periods P46 and P49. As a result, the current required for emitting light is smaller, the strobe problems are reduced, and the quality of the screen is improved.
In the embodiment shown in
In different embodiments, users may select the operations corresponding to the timing diagrams 400A or 500A according to different conditions, such that the pixel device 210′ emits light or not when the control circuit 212′ writes the data signal DT(1).
As shown by way of example in
Similarly, during the period P55, the control circuit 222′ generates the light emitting signal EM(2) according to the second data bit BT(2). At this moment, the light emitting circuit 224′ performs light emitting operations according to the first data bit BT(1). In other words, the light emitting circuit 224′ performs light emitting operations according to the first data bit BT(1) during the periods P53-P55.
In the embodiment shown in
Comparing to
As shown by way of example in
Similarly, during the periods P63-P64, the pixel device 210′ performs a light emitting operation according to the second data bit BT(2) of the data signal DT(1). During the periods P65-P66, the pixel device 210′ performs a light emitting operation according to the third data bit BT(3) of the data signal DT(1), and so on. During the frame time F6 shown in
In some embodiments, during the periods P61, P63 and P65, the data signal DT(1) is written into the pixel device 210′ to control the light emitting circuit 214′, and thus the periods P61, P63 and P65 are referred to as writing periods. During the periods P62, P64 and P66, the light emitting circuit 214′ emits light according to the data signal DT(1), and thus the periods P62, P64 and P66 are referred to as light emitting periods.
In some embodiments, during the frame time F6, time lengths of periods of light emitting operations corresponding to each of the first data bit BT(1) to the kth data bit BT(k) are arranged in order in descending power.
For example, a time length of the periods P61-P62 corresponding to the first data bit BT(1) is twice of a time length of the periods P63-P64 corresponding to the second data bit BT(2), and a time length of the periods P63-P64 corresponding to the second data bit BT(2) is twice of a time length of the periods P65-P66 corresponding to the third data bit BT(3), and so on. During the frame time F6, a time length corresponding to the ith data bit BT(i) is twice of a time length corresponding to the (i+1)th data bit BT(i+1). It is noted that i is a positive integer smaller than k.
In the embodiment shown in
As shown by way of example in
In some embodiments, during the periods P71, P73, P75 and P78, the data signal DT(1) is written into the pixel device 210′ to control the light emitting circuit 214′, and thus the periods P71, P73, P75 and P78 are referred to as writing periods. During the periods P72, P74, P76 and P79, the light emitting circuit 214′ emits light according to the data signal DT(1), and thus the periods P72, P74, P76 and P79 are referred to as light emitting periods.
In some embodiments, during the frame time F7, time lengths of periods of light emitting operations corresponding to each of the first data bit BT(1) to the k′th data bit BT(k′) are same. For example, each of a time length of the periods P71-P72 corresponding to the first data bit BT(1), a time length of the periods P73-P74 corresponding to the second data bit BT(2), a time length of the periods P75-P76 corresponding to the third data bit BT(3) and a time length of the periods P78-P79 corresponding to the k′ data bit BT(k′) are same as each other.
In some embodiments, a time length of each of the writing periods and each of the light emitting periods is substantially equal to one-k′th of a time length of the frame time F7. For example, k′ times of the time length of the periods P71-P72 is equal to the time length of the frame time F7.
As shown by way of example in
In some embodiments, a period corresponding to each of the first data bit BT(1) to the (N+M)th data bit BT(N+M) includes a writing period and a light emitting period. For example, the periods P83, P85, P87 and P810 correspond to writing periods of the data bits BT(N−1), BT(N), BT(N+1) and BT(N+2), respectively, and the periods P84, P86, P88 and P811 correspond to light emitting periods of the data bits BT(N−1), BT(N), BT(N+1) and BT(N+2), respectively.
Referring to
In some embodiments, a time length of each of the periods corresponding to the data bits BT(1)-BT(N) are same as each other. For example, a time length of the period P81 corresponds the data bit BT(1), a time length of the period P82 corresponds the data bit BT(2), a time length of the periods P83-P84 corresponds the data bit BT(N−1), and a time length of the periods P85-P86 corresponds the data bit BT(N) are same as each other.
As shown by way of example in
In some embodiments, a period corresponding to each of the (N+1)th data bit BT(N+1) to the (N+M)th data bit BT(N+M) further includes a disable period. The light emitting circuit 214′ does not emit light during the disable period. For example, the periods P89 and P812 correspond to disable periods of the data bits BT(N+1) and BT(N+2), respectively. During the periods P89 and P812 the light emitting circuit 214′ does not emit light.
In some embodiments, time lengths of the writing periods and the light emitting periods of the (N+1)th data bit BT(N+1) to the (N+M)th data bit BT(N+M) are arranged in order in descending power.
For example, a time length of the writing period P85 and the light emitting period P86 corresponding to the (N)th data bit BT(N) is twice of a time length of the writing period P87 and the light emitting period P88 corresponding to the (N+1)th data bit BT(N+1), and a time length of the periods P87-P88 is twice of a time length of the writing period P810 and the light emitting period P811 corresponding to the (N+2)th data bit BT(N+2), and so on. During the frame time F8, a time length corresponding to the (N+L)th data bit BT(N+L) is half of a time length corresponding to the (N+L−1)th data bit BT(N+L−1). It is noted that L is a positive integer smaller than or equal to M. In some embodiments, a time length of the periods P85-P86 is 2M times of a time length of a writing period and a light emitting period in the period P813 corresponding to the (N+M)th data bit BT(N+M).
In some embodiments, the time lengths of the periods of each of the data bits BT(1)-BT(N+M) are same as each other. The period corresponding to each of the data bits BT(1)-BT(N) includes a writing period and a light emitting period, and the period corresponding to each of the data bits BT(N+1)-BT(N+M) includes a writing period, a light emitting period and a disable period.
For example, a time length of the writing period P85 and the light emitting period P86 corresponding to the data bit BT(N), a time length of the writing period P87, the light emitting period P88 and the disable period P89 corresponding to the data bit BT(N+1), and a time length of the writing period P810, the light emitting period P812 and the disable period P813 corresponding to the data bit BT(N+2) same as each other.
In some embodiments, a time length of the frame time F8 is (N+M) times of a time length of a period corresponding to one of the data bits BT(1)-BT(N+M). For example, the time length of the frame time F8 is equal to (N+M) times of the time length of the period P81 corresponding to the data bit BT(1), and also equal to (N+M) times of the time length of the periods P87-P89 corresponding to the data bit BT(N+1).
In summary, in the embodiments of the present disclosure, a frame time is separated into multiple sub-periods. The ways of the light emitting circuit 214′ emitting light can be updated during each of the sub-periods, such that the operations of the light emitting circuit 214′ have higher flexibility. Furthermore, in the embodiments of the present disclosure, multiple light emitting circuits in the display 200B emit light simultaneously. As a result, the current required for emitting light is smaller, the strobe problems are reduced, and the quality of the screen is improved.
Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims.
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