CN115762423A - Source driver and display device - Google Patents
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- CN115762423A CN115762423A CN202211646105.5A CN202211646105A CN115762423A CN 115762423 A CN115762423 A CN 115762423A CN 202211646105 A CN202211646105 A CN 202211646105A CN 115762423 A CN115762423 A CN 115762423A
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- 230000033228 biological regulation Effects 0.000 claims description 2
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- 238000006243 chemical reaction Methods 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
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Abstract
The application discloses source driver and display device, wherein, source driver includes: a gray scale half voltage input end for accessing gray scale half voltage; a gray scale full voltage input end for accessing gray scale full voltage; the power end of the first operational amplifier is connected with the gray-scale full-voltage input end, and the output end of the first operational amplifier is connected with each odd-numbered row of data lines; a second operational amplifier, the power end of which is connected with the gray scale half-voltage input end, the grounding end of which is grounded, and the output end of which is connected with each even-numbered row data line; the sampling end of the control circuit is connected with the gray-scale half-voltage input end, the input end of the control circuit is connected with the grounding end of the first operational amplifier, and the output end of the control circuit is connected with the power supply end of the second operational amplifier; the control circuit is used for connecting the grounding end of the first operational amplifier with the power supply end of the second operational amplifier when the gray scale half voltage reaches the preset voltage value. The technical scheme of the application can improve the starting display effect of the display adopting the self-luminous device as the pixel.
Description
Technical Field
The present disclosure relates to self-luminous display technologies, and in particular, to a source driver and a display device.
Background
Currently, since self-light emitting devices such as organic light emitting diodes can emit light, a backlight module is not required, and the driving method of the self-light emitting devices is generally considered as a next generation display technology.
However, since the source driver needs to be connected to the gray scale half voltage and the gray scale full voltage in the ac driving, a black screen or a flicker phenomenon is likely to occur when a display device using a self-light emitting device as a pixel is turned on.
Disclosure of Invention
The present application provides a source driver, which aims to solve the problem that the self-luminous device display apparatus is easy to have a black screen or flicker phenomenon when the display apparatus is turned on by ac driving.
To achieve the above object, the present application provides a source driver for a display apparatus including a plurality of data lines and a plurality of self-light emitting devices arranged in a matrix, the source driver comprising:
a gray scale half voltage input end for accessing gray scale half voltage;
a gray scale full voltage input end for accessing gray scale full voltage;
the power supply end of the first operational amplifier is connected with the gray scale full-voltage input end, and the output end of the first operational amplifier is connected with each odd-numbered row data line;
the power supply end of the second operational amplifier is connected with the gray-scale half-voltage input end, the grounding end of the second operational amplifier is grounded, and the output end of the second operational amplifier is connected with each even-numbered row data line;
the sampling end of the control circuit is connected with the gray-scale half-voltage input end, the input end of the control circuit is connected with the grounding end of the first operational amplifier, and the output end of the control circuit is connected with the power supply end of the second operational amplifier;
and the control circuit is used for connecting the grounding end of the first operational amplifier with the power supply end of the second operational amplifier when the gray-scale half voltage is determined to reach a preset voltage value.
Optionally, the control circuit comprises:
and the controlled end, the input end and the output end of the switching device are correspondingly connected with the gray scale half-voltage input end, the grounding end of the first operational amplifier and the power supply end of the second operational amplifier one by one.
Optionally, the switching device is an N-MOS transistor.
Optionally, the source driver further includes:
and the voltage stabilizing circuit is respectively connected with the gray scale half-voltage input end, the power supply end of the second operational amplifier and the sampling end of the control circuit.
Optionally, the voltage regulation circuit comprises a capacitor.
Optionally, the source driver further includes:
and the voltage follower is connected between the gray scale half-voltage input end and the voltage stabilizing circuit.
Optionally, the voltage follower includes a third operational amplifier, a non-inverting terminal of the third operational amplifier is connected to the grayscale half-voltage input terminal, an inverting terminal of the third operational amplifier is connected to the output terminal, and an output terminal of the third operational amplifier is connected to the voltage stabilizing circuit.
The present application also proposes a display device, which includes:
a plurality of data lines; and (c) a second step of,
a plurality of self-light emitting devices arranged in a matrix;
as described above, the source driver is electrically connected to the plurality of data lines through the plurality of data lines.
Optionally, the self-emissive pixels are organic light emitting diodes.
Alternatively, the display device includes an active display region in which the plurality of data lines and the plurality of self-light emitting devices are disposed and a non-active display region in which the source driver is disposed.
According to the technical scheme, the gray scale half-voltage input end, the gray scale full-voltage input end, the first operational amplifier, the second operational amplifier and the control circuit are adopted, and the sampling end of the control circuit is connected with the gray scale half-voltage input end, so that when the control circuit determines that the gray scale half-voltage reaches a preset voltage value, the grounding end of the first operational amplifier is connected with the power supply end of the second operational amplifier; and when the gray-scale half voltage is determined not to reach the preset voltage value, disconnecting the grounding end of the first operational amplifier from the power end of the second operational amplifier. Therefore, when the display device is started, because the gray scale half voltage does not reach the preset voltage value, the connection between the grounding end of the first operational amplifier and the power end of the second operational amplifier is disconnected, even if the gray scale half voltage light load occurs, redundant charges of the gray scale full voltage cannot be shared to the gray scale half voltage, and therefore the phenomenon of black screen cannot be caused due to the fact that an overvoltage protection mechanism of the power management circuit is triggered due to the gray scale half voltage overvoltage, and the phenomenon of flickering cannot be caused due to the fact that the overvoltage protection mechanism of the power management circuit is not triggered.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a source driver according to an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a source driver according to an embodiment of the present disclosure;
FIG. 3 is a schematic circuit diagram of a source driver according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a source driver according to an embodiment of the present disclosure.
The reference numbers illustrate:
the implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In addition, descriptions in this application as to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The first embodiment is as follows:
the application provides a source driver.
Referring to fig. 1 to 4, in an embodiment, the display device includes a plurality of data lines (S1 to Sn + 1), and the source driver includes:
a gray scale half voltage input terminal 10 for accessing a gray scale half voltage HVADD;
a gray scale full voltage input terminal 20 for accessing a gray scale full voltage VADD;
a first operational amplifier A1, wherein a power supply end of the first operational amplifier A1 is connected with the gray scale full voltage input end 20, and an output end of the first operational amplifier A1 is connected with each odd-numbered row data line (S1-Sn);
a power supply end of the second operational amplifier A2 is connected with the gray-scale half-voltage input end 10, a ground end of the second operational amplifier A2 is grounded, and an output end of the second operational amplifier A2 is connected with each even-numbered row of data lines (S2-Sn + 1);
a sampling end of the control circuit 30 is connected with the gray-scale half-voltage input end 10, an input end of the control circuit 30 is connected with a grounding end of the first operational amplifier A1, and an output end of the control circuit 30 is connected with a power supply end of the second operational amplifier A2;
the control circuit 30 is configured to connect the ground terminal of the first operational amplifier A1 and the power terminal of the second operational amplifier A2 when it is determined that the grayscale half voltage HVADD reaches a preset voltage value.
In this embodiment, both the gray-scale full-voltage input terminal 20 and the gray-scale half-voltage input terminal 10 can be connected to a power management circuit in the display device to access the gray-scale full voltage VADD and the gray-scale half-voltage HVADD output by the power management circuit.
The source driver can also be provided with a first digital-to-analog conversion circuit; the non-inverting terminal of the first operational amplifier A1 may be connected to the output terminal of the first digital-to-analog converting circuit to receive the first converted signal output by the first digital-to-analog converting circuit, and the output terminal of the first operational amplifier A1 may be connected to the inverting terminal thereof to form the voltage follower 50. The first operational amplifier A1 is used for carrying out follow-up amplification on the accessed first conversion signal under the action of gray-scale full voltage VADD and a ground terminal voltage, and then outputting the amplified first conversion signal as a data signal to odd-numbered data lines (S1-Sn) in the plurality of data lines (S1-Sn + 1), so that alternating current driving of the self-luminous device connected with the odd-numbered data lines (S1-Sn) is realized. The source driver can also be provided with a second digital-to-analog conversion circuit; the non-inverting terminal of the second operational amplifier A2 may be connected to the output terminal of the second digital-to-analog converting circuit to receive the second converted signal outputted from the second digital-to-analog converting circuit, and the output terminal of the second operational amplifier A2 may be connected to the inverting terminal thereof to form the voltage follower 50. The second operational amplifier A2 is used for carrying out follow-up amplification on the accessed second conversion signal under the action of the gray scale half voltage HVADD and the ground terminal voltage, and then outputting the amplified second conversion signal as a data signal to even-numbered row data lines (S2 to Sn + 1) in the plurality of data lines (S1 to Sn + 1), so that alternating current driving of the self-luminous device connected with the even-numbered row data lines (S2 to Sn + 1) is realized.
Conventionally, the ground terminal of the first operational amplifier A1, the power terminal of the second operational amplifier A2, and the grayscale half-voltage input terminal 10 are usually connected so that the grayscale half-voltage HVADD can be reset to the ground voltage of the first operational amplifier A1 and the power voltage of the second operational amplifier A2. However, when the display device is started, the gray scale full voltage VADD generally rises to a corresponding preset voltage value compared with the gray scale half voltage HVADD, and at this time, the gray scale half voltage HVADD is not stable and is smaller than the corresponding preset voltage value, so that once a light load of a data signal transmitted on even-numbered lines of data lines (S2 to Sn + 1) occurs, that is, the gray scale half voltage HVADD is in a light load, that is, the driving force of the gray scale half voltage HVADD is insufficient, redundant charges of the gray scale full voltage VADD are shared with the gray scale half voltage HVADD through the connection point of the first operational amplifier A1 and the second operational amplifier A2, so that the gray scale half voltage HVADD is over-voltage, and an over-voltage protection mechanism of the power management circuit is triggered, thereby causing a black screen; if the result is, for example: the display device may also flicker if the overvoltage protection mechanism fails due to other reasons such as failure of the overvoltage protection mechanism without triggering the power management circuit.
In view of the above, the present application is provided with the control circuit 30, the control circuit 30 may sample the gray scale half voltage HVADD in real time, and may determine whether the gray scale half voltage HVADD reaches a preset voltage value by comparing a sampling result with a corresponding reference voltage or a preset voltage threshold; the reference voltage or the preset voltage threshold can be determined according to the voltage value when the gray scale half voltage HVADD is stable. The method specifically comprises the following steps: when the comparison result is that the sampling result is not less than the reference voltage or the preset voltage threshold, determining that the gray scale half voltage HVADD reaches the preset voltage value; and when the comparison result is that the sampling result is smaller than the reference voltage or the preset voltage threshold, determining that the gray scale half voltage HVADD does not reach the preset voltage threshold. The control circuit 30 may control the corresponding switching devices to be turned on when it is determined that the gray-scale half voltage HVADD reaches the preset voltage value, so that the turned-on switching devices may connect the ground terminal of the first operational amplifier A1 and the power terminal of the second operational amplifier A2; when the gray-scale half voltage HVADD is determined not to reach the preset voltage value, the respective switching devices Q are controlled to turn off so that the turned-off switching devices Q can disconnect the connection between the ground terminal of the first operational amplifier A1 and the power supply terminal of the second operational amplifier A2.
Therefore, when the display device is started, because the gray-scale half-voltage HVADD does not reach the preset voltage value, the connection between the grounding end of the first operational amplifier A1 and the power end of the second operational amplifier A2 is disconnected, even if light load of the gray-scale half-voltage HVADD occurs, redundant charges of the gray-scale full-voltage VADD cannot be shared to the gray-scale half-voltage HVADD, so that an overvoltage protection mechanism of a power management circuit cannot be triggered due to overvoltage of the gray-scale half-voltage HVADD, a black screen phenomenon cannot be caused, a flicker phenomenon cannot be caused due to the fact that an overvoltage protection mechanism of the power management circuit is not triggered, the problem that the black screen phenomenon or the flicker phenomenon easily occurs when the self-luminous device display device is started by alternating current driving is solved, and the starting display effect of the self-luminous device display device is improved.
Referring to fig. 2 to 4, in the first embodiment, the control circuit 30 includes:
and the controlled end, the input end and the output end of the switching device Q are correspondingly connected with the gray scale half-voltage input end 10, the grounding end of the first operational amplifier A1 and the power supply end of the second operational amplifier A2 one by one.
In this embodiment, the switching device Q may be implemented by a voltage-type switching device. The switching device Q can be turned on when the voltage value of the controlled terminal, that is, the voltage value of the grayscale half-voltage HVADD reaches a preset voltage value, to connect the ground terminal of the first operational amplifier A1 with the power terminal of the second operational amplifier A2; and when the voltage value of the controlled end does not reach the preset voltage value, the controlled end is turned off so as to disconnect the grounding end of the first operational amplifier A1 from the power end of the second operational amplifier A2.
With such an arrangement, the sampling of the gray scale half voltage HVADD can be realized by the on-state voltage of the switching device Q itself, and the connection between the ground terminals and the power source terminals of the two operational amplifiers can be realized by using the on/off state of the switching device Q, so that it is not necessary to provide a dedicated voltage sampling circuit and voltage comparing circuit, thereby not only saving the circuit area occupied by the control circuit 30 in the source driver, but also effectively avoiding the increase of the heat generation amount and power consumption of the source driver.
Optionally, the switching device Q is an N-MSO transistor.
The controlled end, the input end and the output end of the N-MOS tube can be respectively a base electrode, a drain electrode and a source electrode. Therefore, after the gray scale half voltage HVADD is stabilized, the N-MOS tube is automatically conducted under the action of the stabilized gray scale half voltage HVADD to realize the connection between the grounding end of the first operational amplifier A1 and the power end of the second operational amplifier A2; and when the gray scale half voltage HVADD is unstable, the connection between the grounding end of the first operational amplifier A1 and the power end of the second operational amplifier A2 is automatically disconnected under the action of the unstable gray scale half voltage HVADD by the N-MOS tube.
Referring to fig. 3 to 4, in the first embodiment, the source driver further includes:
and the voltage stabilizing circuit 40 is respectively connected with the gray scale half-voltage input end 10, the power supply end of the second operational amplifier A2 and the sampling end of the control circuit 30.
The voltage stabilizing circuit 40 may be implemented using energy storage devices. The voltage stabilizing circuit 40 can charge the energy storage device by using the unstable gray scale half voltage HVADD after the display device is turned on, and can output the stable terminal voltage of the charged energy storage device as the gray scale half voltage HVADD to the power supply terminal of the second operational amplifier A2 and the sampling terminal of the control circuit 30 to supply power to the second operational amplifier A2, and simultaneously trigger the control circuit 30 to connect the ground terminal of the first operational amplifier A1 and the power supply terminal of the second operational amplifier A2. Therefore, the stability of the gray scale half-voltage HVADD can be improved, the backward flowing phenomenon of the gray scale full-voltage VADD can be avoided, the loading capacity of the gray scale half-voltage HVADD in a normal display stage can be enhanced, and the phenomenon that when some pictures are displayed, data signals on even number lines of data lines (S2-Sn + 1) are overloaded, namely when the gray scale half-voltage HVADD is overloaded, the picture display effect is influenced by insufficient driving force of the gray scale half-voltage HVADD can be effectively avoided.
Alternatively, the voltage stabilizing circuit 40 may include a capacitor C, one end of the capacitor C may be connected to the grayscale half-voltage input terminal 10, the power supply terminal of the second operational amplifier A2, and the sampling terminal of the control circuit 30, respectively, and the other end of the capacitor C may be grounded.
Optionally, the source driver further includes:
and the voltage follower 50 is connected between the gray scale half-voltage input end 10 and the voltage stabilizing circuit 40, wherein the voltage follower 50 is connected between the gray scale half-voltage input end 10 and the voltage stabilizing circuit 40.
The voltage follower 50 is used for outputting the gray scale half voltage HVADD to the voltage stabilizing circuit 40 after following and amplifying, and is beneficial to further improving the driving capability of the gray scale half voltage HVADD.
Optionally, the voltage follower 50 includes a third operational amplifier A3, a non-inverting terminal of the third operational amplifier A3 is connected to the grayscale half-voltage input terminal 10, an inverting terminal of the third operational amplifier A3 is connected to an output terminal, and an output terminal of the third operational amplifier A3 is connected to the voltage stabilizing circuit 40, so as to form the voltage follower 50.
In practical applications, the third operational amplifier A3 further has a power source terminal and a ground terminal, wherein the power source terminal can be connected to a predetermined power supply voltage, and the ground terminal can be grounded. The third operational amplifier A3 can follow and amplify the gray scale half voltage HVADD according to the accessed preset power supply voltage and output the gray scale half voltage HVADD to the voltage stabilizing circuit 40, and can adjust the enhancement degree of the source driver for the driving force of the gray scale half voltage HVADD by adjusting the size of the preset power supply voltage.
The second embodiment:
the present application further provides a display apparatus, which includes a plurality of data lines (S1 to Sn + 1), a plurality of self-light emitting devices, and a source driver, where a specific structure of the source driver refers to the foregoing embodiments, and the display apparatus adopts all technical solutions of all the foregoing embodiments, so that the display apparatus at least has all beneficial effects brought by the technical solutions of the foregoing embodiments, and details are not repeated here.
The plurality of self-luminous devices can be arranged in a matrix form to form a self-luminous device array; it is understood that each self-light emitting device can be a pixel of the display device. The data lines (S1-Sn + 1) can be respectively connected with the source electrode driver, each data line can also be connected with a row of self-luminous devices in the self-luminous device array, and each data line is used for accessing a data signal output by the source electrode driver and transmitting the data signal to the row of self-luminous devices connected with the data line so as to realize the alternating current driving of the row of self-luminous devices.
Optionally, the self-emissive pixels are organic light emitting diodes.
Alternatively, the display apparatus includes an active display region in which a plurality of the data lines and a plurality of the self-light emitting devices are disposed, and a self-light emitting device array formed by the plurality of the self-light emitting devices may be disposed corresponding to the active display region, and a non-active display region in which the source driver is disposed.
The above description is only an alternative embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents made by the contents of the specification and the drawings or directly/indirectly applied to other related technical fields under the inventive concept of the present application are included in the scope of the present application.
Claims (10)
1. A source driver for a display apparatus including a plurality of data lines and a plurality of self-light emitting devices arranged in a matrix, the source driver comprising:
a gray scale half voltage input end for accessing gray scale half voltage;
a gray scale full voltage input end for accessing gray scale full voltage;
the power supply end of the first operational amplifier is connected with the gray-scale full-voltage input end, and the output end of the first operational amplifier is connected with each odd-numbered row of data lines;
the power supply end of the second operational amplifier is connected with the gray-scale half-voltage input end, the grounding end of the second operational amplifier is grounded, and the output end of the second operational amplifier is connected with each even-numbered row of data lines;
the sampling end of the control circuit is connected with the gray-scale half-voltage input end, the input end of the control circuit is connected with the grounding end of the first operational amplifier, and the output end of the control circuit is connected with the power supply end of the second operational amplifier;
and the control circuit is used for connecting the grounding end of the first operational amplifier with the power supply end of the second operational amplifier when the gray scale half voltage is determined to reach a preset voltage value.
2. The source driver of claim 1, wherein the control circuit comprises:
and the controlled end, the input end and the output end of the switching device are correspondingly connected with the gray scale half-voltage input end, the grounding end of the first operational amplifier and the power supply end of the second operational amplifier one by one.
3. The source driver of claim 2, wherein the switching device is an N-MOS transistor.
4. The source driver of any of claims 1 to 3, further comprising:
and the voltage stabilizing circuit is respectively connected with the gray scale half-voltage input end, the power supply end of the second operational amplifier and the sampling end of the control circuit.
5. The source driver of claim 4, wherein the regulation circuit comprises a capacitor.
6. The source driver of claim 4, wherein the source driver further comprises:
and the voltage follower is connected between the gray scale half-voltage input end and the voltage stabilizing circuit.
7. The source driver of claim 6, wherein the voltage follower comprises a third operational amplifier, the in-phase terminal of the third operational amplifier is connected to the grayscale half-voltage input terminal, the inverting terminal of the third operational amplifier is connected to the output terminal, and the output terminal of the third operational amplifier is connected to the voltage stabilizing circuit.
8. A display device, characterized in that the display device comprises:
a plurality of data lines; and (c) a second step of,
a plurality of self-light emitting devices arranged in a matrix;
the source driver of any one of claims 1 to 7, electrically connected to a plurality of the data lines through a plurality of the data lines.
9. The display device according to claim 8, wherein the self-light emitting pixels are organic light emitting diodes.
10. The display device according to claim 9, wherein the display device includes an active display region in which a plurality of the data lines and a plurality of self-light emitting devices are provided and a non-active display region in which the source driver is provided.
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| CN202211646105.5A CN115762423B (en) | 2022-12-19 | 2022-12-19 | Source driver and display device |
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| CN202211646105.5A CN115762423B (en) | 2022-12-19 | 2022-12-19 | Source driver and display device |
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| CN115762423B CN115762423B (en) | 2024-03-26 |
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| CN115762423B (en) | 2024-03-26 |
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