Display drive circuit for suppressing a spike

Abstract

The application discloses a display driving circuit for suppressing surge, which comprises an operational amplifier, a switching element and an output inductor. The operational amplifier has a first end and an inverting end, and the first end receives an input signal. The first contact of the switching element is connected to the operational amplifier, and the switching element has a second contact opposite to the first contact. The output inductor is electrically connected between the second contact of the switching element and an output node, so as to generate an output signal at the output node. When the output signal generated by the application is used to drive a display panel, the surge voltage of the output signal can be effectively suppressed and reduced, so that the operating temperature of the display panel is reduced by at least 4 DEG C. In addition, the application is beneficial to maintaining relatively low circuit complexity and process cost of the driving circuit.

Description

Technical Field

[0001] This invention relates to an output stage architecture of a driver circuit chip, and particularly to a display driver circuit with surge suppression. By providing an output inductor therein, the surge voltage of the generated output signal can be reduced, and when applied to drive a display panel, the operating temperature of the display panel can be effectively reduced. Background Technology

[0002] In recent years, in the design of various display panel devices, not only are manufacturing technology, low power consumption, and more efficient driving capabilities noteworthy, but also higher display quality and wider screens are of paramount importance. Thus, it is evident that the evolution and development of various display panel devices are constantly expanding, and their application areas are continuously evolving and broadening.

[0003] Generally, when configuring the detailed circuitry of existing display panel devices, it is known that they typically include: multiple source driver circuits for providing data voltage to the data lines of the display panel, multiple gate driver circuits for providing gate pulses (or scan pulse signals) to the gate lines of the display panel, and a timing controller for controlling the aforementioned source driver circuits and gate driver circuits. Furthermore, since these driver circuits typically incorporate several capacitors as built-in components, the charging and / or discharging of these capacitors inevitably generates so-called spike signals, also known as glitch signals. The presence of these spikes or glitch signals causes an increase in the operating temperature of the display panel. To address this temperature rise, it is known that in existing conventional technologies, additional heat sinks or thermal paste can be used to dissipate heat and achieve cooling. However, these methods require additional process steps, increasing their complexity.

[0004] On the other hand, for those skilled in the art, another possible approach is to directly increase the heat dissipation layout area of ​​the driver circuit. However, even with this approach, as the circuit layout area increases, it also incurs significant manufacturing costs. Therefore, considering the aforementioned prior art, although several possible implementation methods have been proposed, they all still have shortcomings. In view of this, in order to improve upon the long-standing deficiencies in the aforementioned known technologies, further proposing better improvements and optimizations remains a significant challenge and absolutely necessary for the art.

[0005] Therefore, those skilled in the art urgently need to develop a novel and inventive technology that can be used to reduce the operating temperature of a display panel. This technology must not only maintain the overall efficiency of the display panel device, including high output current and high switching speed, but also better control its electromagnetic interference. The technical solution disclosed in this invention aims to solve the problems existing in the prior art and maintain a lower operating temperature of the display panel, thus preventing its operating temperature from rising. Summary of the Invention

[0006] To address the aforementioned shortcomings, one objective of this invention is to provide a display driving circuit characterized by its ability to suppress surges. When the disclosed display driving circuit is used to drive a display panel device, it can simultaneously achieve surge suppression and a lower operating temperature for the display panel device. Therefore, this invention can effectively avoid the overheating problem in the display panel device. Furthermore, as described in the prior art section, conventional heat sinks or thermal pastes used in the prior art can be omitted. In other words, the technical solution disclosed in this invention can significantly reduce the manufacturing cost of the circuit. Moreover, applying this invention eliminates the need to increase the layout area of ​​the driving circuit for heat dissipation. Thus, the complexity and cost of the driving circuit layout can be well controlled and maintained at a relatively low level. Therefore, given the numerous advantages mentioned above, this invention is valid and can be widely applied in related technical fields.

[0007] Based on the technical solution disclosed in this invention, a display driving circuit for suppressing surges is proposed, characterized by incorporating an inductor design. According to an embodiment of the invention, this surge-suppressing display driving circuit includes at least one operational amplifier, a switching element, and an output inductor. The operational amplifier has a first terminal, a second terminal, and an output terminal, wherein the first terminal receives an input signal, and the second terminal is an inverting input and electrically coupled to the output terminal of the operational amplifier. The switching element may be, for example, a switch, and has a first contact and a second contact, wherein the second contact is disposed relative to the first contact. According to an embodiment of the invention, the first contact of the switching element is connected to the output terminal of the operational amplifier. Then, the second contact of the switching element is electrically connected to the output inductor, such that the output inductor is electrically connected between the second contact of the switching element and an output node, thereby generating an output signal at the output node. In practical applications, the output node can be further electrically coupled to a display panel to drive the display panel through the generated output signal. Therefore, when the output signal is used to drive the display panel, the surge voltage of the output signal can be effectively suppressed and reduced, thereby lowering the operating temperature of the display panel by 4 to 5 degrees Celsius. On the other hand, according to a further modification of the present invention, a resistor may also be provided in the display driving circuit disclosed in the present invention. Once the technical content disclosed in this application is understood, those skilled in the art can make appropriate modifications and substitutions without departing from the core technology of the present invention. That is to say, the scope of protection claimed by the present invention is not limited to the embodiments disclosed in this application. Other feasible alternatives and modifications will be obvious to those skilled in the art; however, the present invention should protect and cover equivalent alternatives and modifications.

[0008] Furthermore, it should be understood that the foregoing technical summary and the following detailed description are exemplary and intended to provide a further explanation of the claims made in this invention. Technical Effects Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the architecture of a display driving circuit for suppressing surges according to a first embodiment of the present invention.

[0010] Figure 2 This is a public disclosure based on the present invention. Figure 1 A detailed circuit configuration diagram of the display driver circuit in the embodiment.

[0011] Figure 3 The publicly disclosed application of this invention generates an output signal V compared to existing technologies. out A schematic diagram of the relative waveforms.

[0012] Figure 4 This is a schematic diagram of the architecture of a display driving circuit for suppressing surges according to a second embodiment of the present invention.

[0013] Figure 5 This is a schematic diagram of the architecture of a display driving circuit for suppressing surges according to a third embodiment of the present invention.

[0014] Figure 6 This is a schematic diagram of a circuit layout suitable for forming the output inductor, according to an embodiment of the present invention.

[0015] Figure 7 This is a schematic cross-sectional layout diagram of an embodiment of the present invention suitable for forming the output inductor disclosed in the present invention.

[0016] [Symbol Explanation]

[0017] 20…Source Operational Amplifier

[0018] 22… Output stage driver

[0019] 61… conductor

[0020] 63… solder pads

[0021] 71… Upper metal layer

[0022] 73…lower metal layer

[0023] 75…Intermediate Metal Layer

[0024] 100, 100A, 100B... Display driver circuits

[0025] 102…Operational amplifier

[0026] 104…Switching element

[0027] 106… Output Inductor

[0028] 108… resistor

[0029] 811…Internal Connecting Column

[0030] VDD…Power supply voltage

[0031] GND…grounding voltage

[0032] V I …input signal

[0033] V out Output signal

[0034] N1…output node

[0035] MP…P-type metal-oxide-semiconductor field-effect transistor

[0036] MN…N-type metal-oxide-semiconductor field-effect transistor

[0037] L1…dashed line

[0038] L2…solid line Detailed Implementation

[0039] Embodiments of the present invention will be further explained below with reference to the accompanying drawings. Wherever possible, the same reference numerals represent the same or similar components in the drawings and description. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It is understood that elements not specifically shown in the drawings or described in the description are forms known to those skilled in the art. Those skilled in the art can make various changes and modifications based on the content of this invention.

[0040] Unless otherwise specified, certain conditional clauses or words, such as "can," "could," "might," or "may," are generally intended to express features, elements, or steps that are present in the embodiments of this application, but may also be interpreted as features, elements, or steps that may not be necessary. In other embodiments, these features, elements, or steps may be unnecessary.

[0041] In the following description of "one embodiment" or "an embodiment," the reference refers to a particular element, structure, or feature associated with at least one embodiment. Therefore, the multiple descriptions of "one embodiment" or "an embodiment" appearing in various places below do not refer to the same embodiment. Furthermore, specific components, structures, and features in one or more embodiments may be combined in a suitable manner.

[0042] Certain terms are used in the specification and claims to refer to specific elements. However, those skilled in the art will understand that the same element may be referred to by different names. The specification and claims do not distinguish elements by differences in name, but by differences in function. The term "comprising" in the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to". Furthermore, "coupled" here includes any direct and indirect means of connection. Therefore, if the text describes a first element coupled to a second element, it means that the first element can be directly connected to the second element through electrical connection or signal connection methods such as wireless transmission or optical transmission, or indirectly electrically or signalally connected to the second element through other elements or connection means.

[0043] The disclosure is specifically described by the following examples, which are merely illustrative. Various modifications and refinements can be made by those skilled in the art without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure is determined by the appended claims. Throughout the specification and claims, unless explicitly stated otherwise, the words “a” and “the” include “a or at least one” of the element or component. Furthermore, as used in this disclosure, the singular article also includes a description of a plurality of elements or components unless clearly excluded from the specific context. Moreover, when applied in this description and throughout the claims, unless explicitly stated otherwise, “in which” may include both “in which” and “therein”. The terms used throughout the specification and claims, unless otherwise specified, generally have their ordinary meaning in the art, in the content of this disclosure, and in the specific context. Certain terms used to describe this disclosure will be discussed below or elsewhere in this specification to provide additional guidance to a practitioner in describing this disclosure. Examples throughout this specification, including examples of any terms discussed herein, are for illustrative purposes only and do not limit the scope or meaning of this disclosure or any of the illustrative terms. Similarly, this disclosure is not limited to the various embodiments set forth in this specification.

[0044] In the following paragraphs, the present invention will provide a display driving circuit suitable for suppressing surges. By employing the display driving circuit disclosed in this application, the purpose of driving a display panel can be achieved while suppressing surges. The display panel driven by the present invention can be, for example, a display device having a liquid crystal display (LCD) panel, an organic light-emitting diode (OLED) display panel, or a micro light-emitting diode (μLED) display panel. The display driving circuit disclosed in the present invention can be implemented as a source driver circuit to drive the display panel. Simultaneously, when the display panel is driven using the output signal generated by the present invention, surge voltages in the output signal can be effectively suppressed and reduced, thus suppressing and avoiding signal defects such as surges and glitches commonly found in output voltages in the prior art. Therefore, the operating temperature of the display panel can be reduced by at least 4 to 5 degrees Celsius.

[0045] To fully illustrate the technical features of this invention, please first refer to... Figure 1 As shown, it is a schematic diagram of the architecture of a display driving circuit for suppressing surges according to a first embodiment of the present invention, as follows. Figure 1 As shown, the display driving circuit 100 disclosed in the first embodiment of the present invention can be used to drive a display panel and is intended to eliminate its output signal V. out Spike voltage.

[0046] According to a first embodiment of the present invention, the display driving circuit 100 includes at least one operational amplifier 102, a switching element 104, and an output inductor 106. The operational amplifier 102 has a function for receiving an input signal V. I The operational amplifier 102 has a first terminal and a second terminal that serves as an inverting input. The second terminal (inverting input) is electrically coupled to the output of the operational amplifier 102. A switching element 104 is then electrically coupled to the operational amplifier 102. In embodiments of the invention, the switching element 104 may be, for example, a switch, and is therefore abbreviated as "SW" in the drawings. For instance, the switching element 104 is a two-end component that can be used to turn current on or off, or to control the direction of current flow.

[0047] According to an embodiment of the present invention, the switching element 104 has a first contact and a second contact connected to the output terminal of the aforementioned operational amplifier 102, wherein the second contact is disposed opposite to the first contact. An output inductor 106 is further disposed and electrically connected between the second contact of the switching element 104 and an output node N1, thereby generating an output signal V at the output node N1. out .

[0048] According to an embodiment of the present invention, when the output node N1 is electrically coupled to a display panel, the output signal V out This can then be used to drive the aforementioned display panel. In feasible embodiments of the present invention, the driven display panel may optionally be: a liquid crystal display panel, an organic light-emitting diode display panel, or a micro light-emitting diode display panel. However, it is worth noting that the present invention is not limited to these applications; generally speaking, when the output signal V generated by the present invention... out When driving the display panel, this output signal V out The surge voltage can be effectively suppressed and eliminated, and based on the decrease in surge voltage, the operating temperature of the driven display panel can be significantly improved, for example, by at least 4 to 5 degrees Celsius.

[0049] For details, please refer to the accompanying drawings of this invention. Figure 2 As shown, it is disclosed according to the present invention. Figure 1 A detailed circuit configuration diagram of the display driving circuit 100 in this embodiment is shown below. Figure 2As shown, the operational amplifier 102 disclosed in this invention may include, for example, a source operational amplifier 20 and an output stage driver 22, wherein the output stage driver 22 is electrically coupled to a power supply voltage VDD and a ground voltage GND, and the output stage driver 22 is electrically coupled between the source operational amplifier 20, the output terminal of the operational amplifier 102, and the first contact of the aforementioned switching element 104.

[0050] According to the accompanying drawings of this invention Figure 2 As shown, the output stage driver 22 may include, for example, a P-type metal-oxide-semiconductor field-effect transistor (PMOSFET) MP and an N-type metal-oxide-semiconductor field-effect transistor (NMOSFET) MN. The PMOSFET MP and NMOSFET MN are connected in series, and the PMOSFET MP is electrically coupled to the power supply voltage VDD, the source operational amplifier 20, and the first contact of the switching element 104. Conversely, the NMOSFET MN is electrically coupled to the ground voltage GND, the source operational amplifier 20, and the first contact of the switching element 104. According to an embodiment of the present invention, the output stage driver 22 is a complementary metal-oxide-semiconductor (CMOS) transistor, which implements logic functions by employing complementary and symmetrical P-type and N-type MOSFETs. Generally, CMOS technology can be used to construct integrated circuit chips, including but not limited to microprocessors, microcontrollers, memory chips (including CMOS BIOS), and other digital logic circuits. In addition, CMOS process technology can also be applied to analog circuits, such as image sensors, data converters, radio frequency circuits, and various other highly integrated transceiver circuits for different communication types. Since the relevant technological developments are already significant and known in this art, the applicant will not provide excessive details in this application.

[0051] Please see below. Figure 3 As shown, the publicly disclosed application of this invention generates an output signal V compared to the prior art. out A schematic diagram of the relative waveforms. (See attached diagram.) Figure 3 In the diagram, the applicant uses the dashed line L1 to represent the conventional output signal V. outThe waveform is shown, and the solid line L2 represents the output signal V generated by the present invention. out The waveforms. Comparing these two waveforms, it is clear that the output signal V, shown by the dashed line L1, is different. out Before reaching the stable target voltage, a sharp spike occurs. However, in contrast, when the technical solution disclosed in this invention is used, that is, when an output inductor is provided in the display driver circuit, it can be clearly seen that the output signal V, as shown by the solid line L2, is much smoother. out The surge voltage can be significantly suppressed and reduced. These waveforms clearly demonstrate that this invention successfully proposes an effective surge-suppressing display driving circuit, which can effectively eliminate the surge voltage in the output signal V. out The surge voltage in the display panel can further reduce the operating temperature of the driven display panel. In one embodiment, the temperature reduction can be at least 4°C.

[0052] Furthermore, in the following paragraphs, the present invention proposes several alternative modifications to achieve the inventive effect of suppressing surges. Please refer to... Figure 4 As shown, it is a schematic diagram of the display driving circuit for suppressing surges according to a second embodiment of the present invention, as follows. Figure 4 As shown, the display driving circuit 100A disclosed in the second embodiment of the present invention can also be used to drive a display panel and suppress its output signal V. out Spike voltage.

[0053] In addition to the operational amplifier 102, switching element 104, and output inductor 106 disclosed in the first embodiment of the present invention, the display driving circuit 100A disclosed in the second embodiment of the present invention also includes a resistor 108. The resistor 108 is connected in series with the switching element 104 and the output inductor 106, and specifically disposed between the second contact of the switching element 104 and the output inductor 106.

[0054] However, it is worth noting that the placement of resistor 108 is not based on... Figure 4 The methods disclosed are limited. Please refer to further information. Figure 5 As shown, it is a schematic diagram of the architecture of a display driving circuit for suppressing surges according to a third embodiment of the present invention, as follows. Figure 5 As shown in the display driver circuit 100B disclosed in this third embodiment, the resistor 108 can also optionally be disposed between the output inductor 106 and the output node N1. In this embodiment, the resistor 108 is connected in series with the output inductor 106 to generate the output signal V. out And suppress the output signal V out The surge voltage.

[0055] On the other hand, when integrating the output inductor disclosed in this invention into the display driving circuit during actual manufacturing, multiple wound wires can be used to form the output inductor of this invention. Please refer to the accompanying drawings of this invention. Figure 6 The diagram shows a circuit layout suitable for forming the output inductor. The wires 61 can be wound in a concentric pattern, such as a square, rectangle, octagon, or polygon, to form the output inductor disclosed in this invention between the pads 63 and the internal circuitry (not shown), further achieving electrostatic discharge (ESD) protection.

[0056] On the other hand, please see Figure 7 The diagram shown is a cross-sectional layout schematic suitable for forming the output inductor disclosed in this invention. The wires used to form the output inductor may optionally employ the same or different metal layers, such as... Figure 7 As shown, the upper metal layer 71, lower metal layer 73, and intermediate metal layer 75 are all optional. The upper metal layer 71, lower metal layer 73, and intermediate metal layer 75 can be electrically connected through multiple internal connecting posts 811. According to other embodiments of the present invention, those skilled in the art can also form the output inductor disclosed in the present invention according to different circuit layouts and specifications. The present invention is not intended to limit the embodiments disclosed herein to the protection claimed by its patent rights.

[0057] Therefore, based on the technical solution disclosed in this application, such as Figures 1 to 7 As shown, this invention successfully proposes a surge-suppressing display driving circuit. By configuring it as a source driver circuit, surges in its output voltage can be suppressed and reduced with advantages of low circuit cost and small circuit layout area. Furthermore, based on the reduction in surges, when this output voltage is applied to drive a display panel, the operating temperature of the display panel can also be effectively reduced. Therefore, it is evident that this invention can achieve the optimal results of both surge suppression and panel operating temperature reduction, demonstrating superior inventive efficacy compared to existing technologies.

[0058] Furthermore, according to a feasible embodiment of the present invention, the display driving circuit incorporates an output inductor design, and a resistor is also an optional configuration. Overall, other alternative optional components are also compatible. Other optional embodiments are also covered within the scope of protection claimed by the present invention without departing from the core technical aspects of the invention. That is to say, the present invention is certainly not limited to the previously disclosed configurations.

[0059] Therefore, through precise configuration and innovative design, this invention successfully proposes a driving circuit applicable to source drivers. Based on the surge suppression display driving circuit disclosed in this invention, not only can surge suppression be achieved, but also lower operating temperatures can be controlled for the driven display panel. This invention can be applied not only to common electronic components, but also widely to various electronic circuit components in the semiconductor industry, integrated circuit industry, or power electronics. Clearly, the technical solution claimed by the applicant in this case possesses excellent industrial applicability and competitiveness. Furthermore, the technical features, methods, and achieved technical effects disclosed in this invention are significantly different from existing solutions and cannot be easily replicated by those skilled in the art, thus meeting patent requirements.

[0060] The embodiments described above are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. That is, all equivalent changes or modifications made in accordance with the spirit disclosed in the present invention should still be covered within the scope of protection claimed in the claims of the present invention.

Claims

1. A display driving circuit for suppressing surges, comprising: An operational amplifier has a first terminal, a second terminal, and an output terminal, wherein the first terminal receives an input signal, and the second terminal of the operational amplifier is electrically coupled to the output terminal of the operational amplifier. A switching element has a first contact and a second contact, wherein the second contact is disposed opposite to the first contact, and the first contact of the switching element is connected to the output terminal of the operational amplifier; and An output inductor is electrically connected between the second contact of the switching element and the output node, thereby generating an output signal at the output node.

2. The surge-suppressing display driving circuit as described in claim 1 further includes a resistor, wherein, The resistor is connected in series with the output inductor to generate the output signal, and the resistor is positioned between the output inductor and the output node.

3. The surge-suppressing display driving circuit as described in claim 1 further includes a resistor, wherein, The resistor is connected in series with the output inductor, and the resistor is positioned between the second contact of the switching element and the output inductor.

4. The display driving circuit for suppressing surges as described in claim 1, wherein, The output node is electrically coupled to the display panel to drive the display panel through the generated output signal.

5. The display driving circuit for suppressing surges as described in claim 4, wherein, The display panel can be a liquid crystal display panel, an organic light-emitting diode display panel, or a micro light-emitting diode display panel.

6. The display driving circuit for suppressing surges as described in claim 4, wherein, When the output signal is used to drive the display panel, the surge voltage of the output signal can be suppressed and reduced.

7. The display driving circuit for suppressing surges as described in claim 1, wherein, The output inductor comprises multiple wires that are wound in a concentric pattern to form the output inductor.

8. The display driving circuit for suppressing surges as described in claim 7, wherein, The concentric patterns formed by the winding of the wires include: squares, rectangles, octagons, polygons, etc.

9. The display driving circuit for suppressing surges as described in claim 7, wherein, The conductors of the output inductor may use the same or different metal layers.

10. The display driving circuit for suppressing surges as described in claim 1, wherein, The operational amplifier includes a source operational amplifier and an output stage driver. The output stage driver is electrically coupled to a power supply voltage and a ground voltage. The output stage driver is electrically coupled between the source operational amplifier, the output terminal of the operational amplifier, and the first contact of the switching element.

11. The display driving circuit for suppressing surges as described in claim 10, wherein, The output stage driver includes a P-type metal-oxide-semiconductor field-effect transistor and an N-type metal-oxide-semiconductor field-effect transistor, which are connected in series. The P-type field-effect transistor is electrically coupled to the power supply voltage, the source operational amplifier, and the first contact of the switching element, and the N-type field-effect transistor is electrically coupled to the ground voltage, the source operational amplifier, and the first contact of the switching element.

12. The display driving circuit for suppressing surges as described in claim 6, wherein, When the surge voltage in the output signal decreases, the operating temperature of the display panel drops by 4 to 5 degrees Celsius.

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