Voltage regulating circuit and driving chip for display device
By designing a multi-stage multi-channel distributed voltage circuit in the display device, the problem of noise interference in the driver chip is solved, the accuracy and stability of the VDATA voltage are improved, and the OLED display effect is improved.
Patent Information
- Application Number
- CN202411546971.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-01-10
AI Technical Summary
In normal working conditions, existing driver chips will bring noise into the power supply system and reference voltage signal chain, resulting in poor accuracy and stability of VDATA voltage, affecting the display effect of the AMOLED panel.
Design a voltage circuit for display devices, including a power supply voltage unit and a reference voltage signal chain voltage unit, and performs a voltage supply power supply and reference voltage signals of the chip through multi-stage multi-channel distributed voltage to suppress noise interference.
It effectively improves the accuracy and anti-noise interference capability of the driver chip GAMMA voltage, improves the accuracy and stability of the VDATA voltage, and thus improves the OLED display effect.
Smart Images
Figure CN119296480A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of display panels, and in particular to a voltage regulation circuit and a driving chip for a display device. Background Art
[0002] like Figure 1 The figure shows the luminous pixel circuit of the AMOLED (Active Matrix / Organic Light Emitting Diode) panel display screen. The panel luminous pixel circuit is a 7T1C (circuit including 7 transistors and 1 storage capacitor) structure. This structure can compensate for the non-uniformity and drift of the Vth (The threshold voltage) of the TFT pixel circuit, so that the pixel current is not related to the Vth of the switch tube of the TFT pixel circuit and maintains stability. In addition, the driver chip converts the processed image display data into an analog voltage (V DATA ), connected to the DATA line of the pixel circuit, charging the storage capacitor, V DATA The current generated by the driving tube drives the diode to emit light. The current value expression of the pixel current is: , where μ, , is the parameter of TFT pixel circuit, ELVDD is the power supply voltage generated by PMIC (Power Management IC) circuit, V DATA The grayscale voltage generated by the driver chip GAMMA correction, ELVDD and V DATA The difference between V DATA The accuracy and stability of the voltage are directly related to the pixel current, which in turn affects the display effect of the AMOLED panel. DATA The quality of voltage signal is one of the key indicators in driver chip design.
[0003] In normal working state, the existing driver chip will introduce a lot of noise into the power supply system and reference voltage signal chain in the chip, such as power supply noise, device noise and environmental noise. These noises seriously affect the quality of the reference voltage signal, and the noise components are further induced by the gamma voltage regulation circuit and V DATA The voltage output circuit will amplify it several times, which causes the V output from the driver chip to the pixel circuit to DATA The voltage accuracy and stability deteriorate, causing fluctuations in screen brightness and color accuracy. Summary of the invention
[0004] Based on this, it is necessary to provide a voltage regulation circuit and a driving chip for a display device to solve the noise problem in the power supply system and the reference voltage signal chain of the display device in the above background technology, which can avoid the interference of noise on the GAMMA voltage and improve V DATA The accuracy and stability of the voltage can improve the OLED display effect.
[0005] To achieve the above-mentioned object and other related objects, the first aspect of the present application provides a voltage regulation circuit for a display device, wherein the voltage regulation circuit is connected to an external power supply of a chip of the display device, and the voltage regulation circuit comprises:
[0006] A power voltage regulation unit, wherein the input end of the power voltage regulation unit is directly connected to the output end of the power supply external to the chip, and the power voltage regulation unit comprises at least one level of power voltage regulation circuit for performing at least one level of voltage regulation on the power supply external to the chip;
[0007] A reference voltage signal chain voltage regulating unit, wherein the input end of the reference voltage signal chain voltage regulating unit is connected to the output end of the power supply voltage regulating unit, and the reference voltage signal chain voltage regulating unit includes at least two levels of reference voltage regulating circuits for performing at least two levels of voltage regulation on the reference voltage.
[0008] In one embodiment, the voltage regulating circuit for a display device includes a power supply voltage regulating branch, a reference voltage regulating branch and a bandgap reference voltage regulating branch, and the input ends of the power supply voltage regulating branch, the reference voltage regulating branch and the bandgap reference voltage regulating branch are directly or indirectly connected to the output end of the chip external power supply, for performing multi-channel voltage regulation on the chip external power supply.
[0009] In one embodiment, the power supply voltage regulation unit includes: a global power supply voltage regulation circuit, the input end of the global power supply voltage regulation circuit is directly connected to the output end of the chip external power supply, and is used to perform a first level of voltage regulation on the chip external power supply; a local power supply voltage regulation circuit, the input end of the local power supply voltage regulation circuit is connected to the output end of the global power supply voltage regulation circuit, and the local power supply voltage regulation circuit includes at least one level of local power supply voltage regulation circuit, and is used to perform at least a second level of voltage regulation on the chip external power supply.
[0010] In one embodiment, the local power supply voltage regulation circuit includes at least two local power supply voltage regulation circuits, which are used to perform at least two voltage regulation processes on the external power supply of the chip.
[0011] In one embodiment, the power supply voltage regulation unit includes a global power supply voltage regulation circuit, a global reference voltage power supply voltage regulation circuit and a bandgap reference power supply voltage regulation circuit, which are used to perform multi-channel voltage regulation processing on the chip external power supply, wherein the input ends of the global power supply voltage regulation circuit and the bandgap reference power supply voltage regulation circuit are directly connected to the output ends of the chip external power supply, which are used to perform first-level voltage regulation processing on the chip external power supply, and the input end of the global reference voltage power supply voltage regulation circuit is connected to the output end of the chip external power supply or the output end of the global power supply voltage regulation circuit, which is used to perform first-level or second-level voltage regulation processing on the chip external power supply.
[0012] In one embodiment, the reference voltage signal chain regulating unit includes a local reference voltage regulating circuit, including a multi-stage local reference voltage regulating circuit, each stage of the local reference voltage regulating circuit is electrically connected to the global reference voltage power supply regulating circuit, and the multi-stage local reference voltage regulating circuit performs voltage regulation on the reference in turn.
[0013] In one embodiment, the reference voltage signal chain regulating unit also includes a bandgap reference circuit, the input end of the bandgap reference is connected to the output end of the bandgap reference power supply regulating circuit, the bandgap reference circuit is used to generate a bandgap reference voltage, the input end of the local reference voltage regulating circuit is connected to the output end of the bandgap reference circuit, and the multi-stage local reference voltage regulating circuit sequentially regulates the bandgap reference voltage output by the bandgap reference circuit.
[0014] In one embodiment, the reference voltage signal chain regulating unit also includes a reference voltage generating circuit, including a multi-stage reference voltage generating circuit, wherein the input end of each stage of the reference voltage generating circuit is respectively connected to the output end of the local power supply regulating circuit and the output end of the local reference voltage regulating circuit, and the output signal of the local reference voltage regulating circuit serves as the input reference voltage of the reference voltage generating circuit.
[0015] In one embodiment, the reference voltage generating circuit at least includes a GAMMA voltage generating circuit, and the GAMMA voltage generating circuit serves as a final-stage reference voltage generating circuit of the multi-stage reference voltage generating circuit.
[0016] A second aspect of the present application provides a driver chip for a display device, comprising a voltage regulation circuit for a display device according to any one of the above items.
[0017] According to the voltage regulation circuit and driving chip for a display device provided by the present invention, a power voltage regulation unit performs multi-level and multi-path distributed voltage regulation on an external power supply of a chip, and a reference voltage signal chain voltage regulation unit performs multi-level distributed voltage regulation on a reference voltage signal chain, thereby effectively improving the accuracy and noise resistance of the GAMMA voltage of a display device driving chip, and enhancing V DATA The accuracy and stability of the voltage can improve the OLED display effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to better describe and illustrate the embodiments and / or examples of those applications disclosed herein, reference may be made to one or more drawings. The additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed applications, the embodiments and / or examples currently described, and the best modes of these applications currently understood.
[0019] FIG1 is a schematic diagram of a light-emitting pixel circuit of an AMOLED panel display screen in the prior art;
[0020] FIG2 is a schematic diagram of a voltage regulation circuit for a display device provided in an embodiment;
[0021] FIG. 3 is a schematic diagram showing another principle of a voltage regulation circuit for a display device provided in an embodiment.
[0022] Description of reference numerals:
[0023] 100, chip external power supply; 200, power supply regulation unit; 300, reference voltage signal chain regulation unit; 110, global power supply regulation circuit; 120, local power supply regulation circuit; 120A, first local power supply regulation circuit; 120B, second local power supply regulation circuit; 120C, third local power supply regulation circuit; 130, reference voltage generating circuit; 130A, first reference voltage generating circuit; 130B, second reference voltage generating circuit; 130C, GAMMA voltage generating circuit; 210, global reference voltage supply regulation circuit; 220, local reference voltage regulation circuit; 220A, first local reference voltage regulation circuit; 220B, second local reference voltage regulation circuit; 220C, third local reference voltage regulation circuit; 310, bandgap reference power supply regulation circuit; 320, bandgap reference circuit. DETAILED DESCRIPTION
[0024] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0026] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part.
[0027] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.
[0028] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.
[0029] Embodiments of the application are described herein with reference to cross-sectional views that are schematic diagrams of ideal embodiments (and intermediate structures) of the application. Thus, variations from the shapes shown due to, for example, manufacturing techniques and / or tolerances can be expected. Therefore, embodiments of the application should not be limited to the specific shapes of the zones shown herein, but rather include shape deviations due to, for example, manufacturing, and the zones shown in the figures are schematic in nature, and their shapes are not intended to display the actual shapes of the zones of the device and are not intended to limit the scope of the application.
[0030] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner. Although the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation, the type, quantity and proportion of each component in actual implementation may be changed arbitrarily, and the component layout type may also be more complicated.
[0031] Embodiment 1
[0032] The present invention provides a voltage regulating circuit for a display device, wherein the voltage regulating circuit is connected to an external power supply of a chip of the display device, and the voltage regulating circuit comprises: a power regulating unit, wherein the input end of the power regulating unit is directly connected to the output end of the external power supply of the chip, and the power regulating unit comprises at least one level of power regulating circuit for performing at least one level of voltage regulation on the external power supply of the chip; and a reference voltage signal chain regulating unit, wherein the input end of the reference voltage signal chain regulating unit is connected to the output end of the power regulating unit, and the reference voltage signal chain regulating unit comprises at least two levels of reference voltage regulating circuits for performing at least two levels of voltage regulation on the reference voltage.
[0033] According to the voltage regulation circuit for a display device provided by the present invention, a power regulation unit performs multi-level and multi-path distributed regulation on an external power supply of a chip, and a reference voltage signal chain regulation unit performs multi-level distributed regulation on a reference voltage signal chain, thereby effectively improving the accuracy and noise resistance of the GAMMA voltage of a display device driving chip, and improving V DATAThe accuracy and stability of the voltage can improve the OLED display effect.
[0034] Exemplarily, a voltage regulation circuit for a display device is connected to a chip external power supply 100 of the display device, and the voltage regulation circuit includes a power regulation unit 200 and a reference voltage signal chain regulation unit 300. The power regulation unit 200 performs multi-level and multi-channel distribution regulation on the chip external power supply, and the reference voltage signal chain regulation unit 300 performs multi-level distribution regulation on the reference voltage signal chain. The two work together to avoid or reduce the impact of noise on the GAMMA voltage of the display device driver chip, thereby increasing V DATA The accuracy and stability of the voltage can improve the OLED display effect.
[0035] Exemplarily, the power supply voltage regulation unit 200 includes at least one level of power supply voltage regulation circuit, which is used to perform at least one level of voltage regulation on the chip external power supply 100. By setting the power supply voltage regulation circuit, at least one level of voltage regulation is performed on the chip external power supply to suppress power supply noise and prevent the power supply noise from entering the reference voltage signal chain unit.
[0036] In one embodiment, referring to Figure 2 and Figure 3 As shown, the power supply regulating unit 200 includes a global power supply regulating circuit 110 , a local power supply regulating circuit 120 , a global reference voltage power supply regulating circuit 210 and a bandgap reference power supply regulating circuit 310 .
[0037] In one embodiment, the power supply voltage regulation circuit includes a global power supply voltage regulation circuit 110 and a local power supply voltage regulation circuit 120. The input end of the global power supply voltage regulation circuit 110 is directly connected to the output end of the chip external power supply 100, and is used to perform a first-level voltage regulation process on the chip external power supply. The input end of the local power supply voltage regulation circuit 120 is connected to the output end of the global power supply voltage regulation circuit 110, and the local power supply voltage regulation circuit 120 includes at least one level of local power supply voltage regulation circuit, which is used to perform at least a second-level voltage regulation process on the chip external power supply. Further, when the number of levels of the local power supply voltage regulation circuit is M, the chip external power supply is subjected to a second-level to M+1-level voltage regulation process. In addition, the local power supply voltage regulation circuit includes at least two local power supply voltage regulation circuits, which are used to perform at least two-way voltage regulation process on the chip external power supply, and when the number of ways of the local power supply voltage regulation circuit is N, the chip external power supply is subjected to an N-way voltage regulation process. It should be noted that the number of levels M and the number of ways N of the local power supply voltage regulation circuit 120 can be set as needed, and this application does not limit this.
[0038] In one embodiment, referring to Figure 2 and Figure 3As shown, the global power voltage regulation circuit 110 is directly connected to the power supply outside the chip to perform the first level voltage regulation on the power supply. The local power voltage regulation circuit 120 includes a first level local power voltage regulation circuit to perform the second level voltage regulation on the power supply outside the chip. By providing the global power voltage regulation circuit and the local power voltage regulation circuit, the power supply outside the chip is regulated at least in two levels, and the anti-noise processing effect is better than that of only performing the first level voltage regulation.
[0039] In one embodiment, referring to Figure 2 As shown, the input ends of the global power supply voltage regulation circuit 110 and the bandgap reference power supply voltage regulation circuit 310 are directly connected to the output end of the chip external power supply 100, so as to perform the first level voltage regulation on the chip external power supply. The input ends of the global reference voltage supply voltage regulation circuit 210 and the local power supply voltage regulation circuit 120 are connected to the output end of the global power supply voltage regulation circuit 110, so as to perform the second level voltage regulation on the chip external power supply.
[0040] In one embodiment, referring to Figure 3 As shown, the input ends of the global power supply voltage regulation circuit 110, the global reference voltage supply voltage regulation circuit 210 and the bandgap reference voltage regulation circuit 310 are directly connected to the output end of the chip external power supply 100. At this time, the global power supply voltage regulation circuit 110, the global reference voltage supply voltage regulation circuit 210 and the bandgap reference voltage regulation circuit 310 are all used to perform the first level voltage regulation processing on the chip external power supply. The local power supply voltage regulation circuit 120 is used to perform the second level voltage regulation processing on the chip external power supply.
[0041] In one embodiment, the global reference voltage power supply voltage regulator circuit 210 is directly connected to the output end of the chip external power supply 100, compared with being connected to the global power supply voltage regulator circuit 110, so that the power supply of the reference voltage signal chain voltage regulator circuit can be separated from the global power supply, and the influence of device noise and environmental noise on the GAMMA voltage can be reduced. Compared with being connected to the output end of the chip external power supply 100, the power supply of the reference voltage signal chain voltage regulator circuit has undergone one more level of voltage regulation when the global reference voltage power supply voltage regulator circuit 210 is directly connected to the global power supply voltage regulator circuit 110, and the power supply noise suppression effect on the GAMMA voltage is better. The two connection methods have their own advantages and can be selected as needed.
[0042] Exemplarily, the voltage regulation circuit includes at least two voltage regulation branches, and the at least two voltage regulation branches are directly or indirectly connected to the chip external power supply, and are used to perform at least two voltage regulation processes on the chip external power supply. By dividing the chip external power supply 100 into multiple branches, the power supply noise component is greatly reduced from the power supply source, thereby providing a separate and stable power supply voltage for each module in the reference voltage signal chain voltage regulation unit 300, thereby ensuring that the reference voltage signal chain voltage regulation unit 300 has better voltage regulation performance.
[0043] Exemplarily, the voltage regulation circuit includes a power voltage regulation branch, a reference voltage voltage regulation branch and a bandgap reference voltage regulation branch, and the input ends of the power voltage regulation branch, the reference voltage voltage regulation branch and the bandgap reference voltage regulation branch are directly or indirectly connected to the output end of the chip external power supply, and are used to perform multi-channel voltage regulation on the chip external power supply. The power voltage regulation branch, the reference voltage regulation branch and the bandgap reference voltage regulation branch are voltage regulation branches with different functions, and each voltage regulation branch obtains different signals after voltage regulation on the chip external power supply, and the reference voltage signal chain voltage regulation unit 300 further performs voltage regulation based on different signals.
[0044] In one embodiment, referring to Figure 2 and Figure 3 As shown, the power supply voltage regulation branch includes a global power supply voltage regulation circuit 110 and a local power supply voltage regulation circuit 120, and the input end of the local power supply voltage regulation circuit 120 is connected to the output end of the global power supply voltage regulation circuit 110. Further, the local power supply voltage regulation circuit 120 also includes three branches: a first local power supply voltage regulation circuit 120A, a second local power supply voltage regulation circuit 120B, and a third local power supply voltage regulation circuit 120C. The reference voltage regulation branch includes a global reference voltage supply voltage regulation circuit 210 and a local reference voltage regulation circuit 220, and the input end of the local reference voltage regulation circuit 220 is connected to the output end of the global reference voltage supply voltage regulation circuit 210. Further, the local reference voltage regulation circuit 220 also includes three branches: a first local reference voltage regulation circuit 220A, a second local reference voltage regulation circuit 220B, and a third local reference voltage regulation circuit 220C. The bandgap reference voltage regulating branch includes a bandgap reference power supply voltage regulating circuit 310 and a bandgap reference circuit 320 . An input end of the bandgap reference circuit 320 is connected to an output end of the bandgap reference power supply voltage regulating circuit 310 .
[0045] In one embodiment, referring to Figure 2As shown, the input ends of the global power supply regulating circuit 110 and the bandgap reference power supply regulating circuit 310 are directly connected to the output end of the chip external power supply 100, and the chip external power supply is divided for the first time. The input end of the global reference voltage supply regulating circuit 210 is connected to the output end of the global power supply regulating circuit 110, and the chip external power supply is divided for the second time. After two divisions, the chip external power supply is divided into three paths.
[0046] In one embodiment, referring to Figure 3 As shown, the input ends of the global power supply regulating circuit 110, the global reference voltage supply regulating circuit 210 and the bandgap reference power supply regulating circuit 310 are directly connected to the output end of the chip external power supply 100, directly dividing the chip external power supply into three paths.
[0047] Exemplarily, the reference voltage signal chain voltage regulating unit 300 includes at least two levels of reference voltage regulating circuits, which are used to perform at least two levels of voltage regulation on the reference voltage in sequence. The reference voltage signal chain voltage regulating unit 300 includes reference voltage generating circuits at various levels and local reference voltage regulating circuits at various levels, wherein the GMMMA voltage generating circuit is the last level of the reference voltage generating circuits at various levels. By performing multi-level distributed voltage regulation on the reference voltage signal chain, and adding reference voltage regulating circuits between the reference voltage generating circuits at various levels to distribute and regulate the reference voltages at various levels, various noise components can be effectively suppressed, and device noise and environmental noise can be prevented from entering the GAMMA voltage generating circuit, thereby providing a clean and stable reference voltage for the GAMMA voltage generating circuit, so as to achieve the improvement of V DATA The purpose is to improve voltage accuracy and stability, and ultimately enhance OLED display effects.
[0048] In one embodiment, Figure 2 and Figure 3 As shown, the reference voltage signal chain voltage regulating unit 300 includes a reference voltage generating circuit 130, a local reference voltage regulating circuit 220 and a bandgap reference circuit 320. Specifically, the reference voltage generating circuit 130 includes three levels of reference voltage generating circuits: a first reference voltage generating circuit 130A, a second reference voltage generating circuit 130B and a GAMMA voltage generating circuit 130C. Further, each level of the local reference voltage regulating circuit 220 includes three levels of local reference voltage regulating circuits: a first local reference voltage regulating circuit 220A, a second local reference voltage regulating circuit 220B and a third local reference voltage regulating circuit 220C.
[0049] Exemplarily, the input end of the local reference voltage regulator circuit 220 is connected to the output end of the bandgap reference circuit 320, and the multi-stage local reference voltage regulator circuit 220 sequentially regulates the bandgap reference voltage output by the bandgap reference circuit 320. Further, the plurality of reference voltage generating circuits 130 and the multi-stage local reference voltage regulator circuit 220 are alternately arranged, and the local reference voltage regulator circuit regulates the reference voltage generated by the previous reference voltage generating circuit, and the processed signal is used as the input reference voltage of the next reference voltage generating circuit.
[0050] In one embodiment, Figure 2 and Figure 3 As shown, the first local reference voltage rectifying circuit 220A is powered by the global reference voltage power rectifying circuit 210, and is responsible for rectifying the reference voltage generated by the bandgap reference circuit 320, and the processed signal is used as the input reference voltage of the first reference voltage generating circuit 130A; the second local reference voltage rectifying circuit 220B is powered by the global reference voltage power rectifying circuit 210, and is responsible for rectifying the reference voltage generated by the first reference voltage generating circuit 130A, and the processed signal is used as the input reference voltage of the second reference voltage generating circuit 130B; the third local reference voltage rectifying circuit 220C is powered by the global reference voltage power rectifying circuit 210, and is responsible for rectifying the reference voltage generated by the second reference voltage generating circuit 130B, and the processed signal is used as the input reference voltage of the GAMMA voltage generating circuit 130C.
[0051] In one embodiment, referring to Figure 2 and Figure 3As shown, the voltage regulation circuit for the display device includes a global power supply voltage regulation circuit 110, a local power supply voltage regulation circuit 120 (a first local power supply voltage regulation circuit 120A, a second local power supply voltage regulation circuit 120B, and a third local power supply voltage regulation circuit 120C), a reference voltage generating circuit 130 (a first reference voltage generating circuit 130A, a second reference voltage generating circuit 130B, and a GAMMA voltage generating circuit 130C), a global reference voltage supply voltage regulation circuit 210, a local reference voltage regulation circuit 220 (a first local reference voltage regulation circuit 220A, a second local reference voltage regulation circuit 220B, and a third local reference voltage regulation circuit 220C), a bandgap reference power supply voltage regulation circuit 310, and a bandgap reference circuit 320. It is composed of a multi-stage multi-channel power supply rectification circuit and a multi-stage reference voltage rectification circuit: the power supply rectification unit 200 is composed of a global power supply rectification circuit 110, a local power supply rectification circuit 120, a global reference voltage supply rectification circuit 210 and a bandgap reference power supply rectification circuit 310; the reference voltage signal chain rectification unit 300 is composed of a reference voltage generating circuit 130, a local reference voltage rectification circuit 220 and a bandgap reference circuit 320; the power supply rectification branch is composed of the global power supply rectification circuit 110 and the local power supply rectification circuit 120; the reference voltage rectification branch is composed of the global reference voltage supply rectification circuit 210 and the local reference voltage rectification circuit 220; the bandgap reference power supply rectification circuit 310 and the bandgap reference circuit 320 constitute a bandgap reference rectification branch.
[0052] According to the voltage regulation circuit for a display device provided in this embodiment, on the one hand, multi-channel and multi-level distributed voltage regulation is performed from the power supply end to provide a separate and stable power supply voltage for each module circuit in the reference voltage signal chain in the chip, thereby greatly reducing the power supply noise component from the power source. At the same time, power supply voltage regulation processing is provided for the reference voltage signal chain voltage regulation circuit, thereby ensuring that the reference voltage signal chain voltage regulation circuit has better voltage regulation performance. On the other hand, adding multi-level distributed voltage regulation to the reference voltage signal chain system, adding voltage regulation circuits between each level of the reference voltage generation circuit, and distributing and regulating the reference voltage at each level can effectively suppress various noise components, thereby providing a clean and stable reference voltage for the GAMMA voltage generation circuit. In order to achieve the goal of improving V DATA The purpose is to improve voltage accuracy and stability, and ultimately enhance OLED display effects.
[0053] Embodiment 2
[0054] The present invention also provides a driving chip for a display device, wherein a voltage regulating circuit arranged in the driving chip of the display device is connected to an external power supply of the chip of the display device, and the voltage regulating circuit comprises: a power regulating unit, wherein the input end of the power regulating unit is directly connected to the output end of the external power supply of the chip, and the power regulating unit comprises at least one level of power regulating circuit for performing at least one level of voltage regulation on the external power supply of the chip; and a reference voltage signal chain regulating unit, wherein the input end of the reference voltage signal chain regulating unit is connected to the output end of the power regulating unit, and the reference voltage signal chain regulating unit comprises at least two levels of reference voltage regulating circuits for performing at least two levels of voltage regulation on the reference voltage.
[0055] Exemplarily, a voltage regulation circuit for a display device is connected to a chip external power supply 100 of the display device, and the voltage regulation circuit includes a power regulation unit 200 and a reference voltage signal chain regulation unit 300. The power regulation unit 200 performs multi-level and multi-channel distribution regulation on the chip external power supply, and the reference voltage signal chain regulation unit 300 performs multi-level distribution regulation on the reference voltage signal chain. The two work together to avoid or reduce the impact of noise on the GAMMA voltage of the display device driver chip, thereby increasing V DATA The accuracy and stability of the voltage can improve the OLED display effect.
[0056] Exemplarily, the power supply voltage regulation unit 200 includes at least one level of power supply voltage regulation circuit, which is used to perform at least one level of voltage regulation on the chip external power supply 100. By setting the power supply voltage regulation circuit, at least one level of voltage regulation is performed on the chip external power supply to suppress power supply noise and prevent the power supply noise from entering the reference voltage signal chain unit.
[0057] Exemplarily, the voltage regulation circuit includes at least two voltage regulation branches, and the at least two voltage regulation branches are directly or indirectly connected to the chip external power supply, and are used to perform at least two voltage regulation processes on the chip external power supply. By dividing the chip external power supply 100 into multiple branches, the power supply noise component is greatly reduced from the power supply source, thereby providing a separate and stable power supply voltage for each module in the reference voltage signal chain voltage regulation unit 300, thereby ensuring that the reference voltage signal chain voltage regulation unit 300 has better voltage regulation performance.
[0058] Exemplarily, the reference voltage signal chain voltage regulating unit 300 includes at least two levels of reference voltage regulating circuits, which are used to perform at least two levels of voltage regulation on the reference voltage in sequence. The reference voltage signal chain voltage regulating unit 300 includes reference voltage generating circuits at various levels and local reference voltage regulating circuits at various levels, wherein the GMMMA voltage generating circuit is the last level of the reference voltage generating circuits at various levels. By performing multi-level distributed voltage regulation on the reference voltage signal chain, and adding reference voltage regulating circuits between the reference voltage generating circuits at various levels to distribute and regulate the reference voltages at various levels, various noise components can be effectively suppressed, and device noise and environmental noise can be prevented from entering the GAMMA voltage generating circuit, thereby providing a clean and stable reference voltage for the GAMMA voltage generating circuit, so as to achieve the improvement of V DATA The purpose is to improve voltage accuracy and stability, and ultimately enhance OLED display effects.
[0059] In one embodiment, the driving chip of the display device further includes a high-speed interface circuit, a digital circuit and an analog circuit. The display device can be applied to various electronic devices including display devices, including but not limited to: televisions, computer monitors, mobile phones, smart watches, smart Internet of Things devices, etc.
[0060] Please note that the above embodiments are for illustrative purposes only and are not intended to limit the present application.
[0061] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0063] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A voltage regulation circuit for a display device, characterized in that: The voltage regulation circuit is connected to the chip external power supply of the display device, and the voltage regulation circuit includes: A power voltage regulation unit, wherein the input end of the power voltage regulation unit is directly connected to the output end of the power supply external to the chip, and the power voltage regulation unit comprises at least one level of power voltage regulation circuit for performing at least one level of voltage regulation on the power supply external to the chip; A reference voltage signal chain voltage regulating unit, wherein the input end of the reference voltage signal chain voltage regulating unit is connected to the output end of the power supply voltage regulating unit, and the reference voltage signal chain voltage regulating unit includes at least two levels of reference voltage regulating circuits for performing at least two levels of voltage regulation on the reference voltage.
2. The voltage regulating circuit for a display device according to claim 1, characterized in that: It includes a power supply voltage regulation branch, a reference voltage regulation branch and a bandgap reference voltage regulation branch. The input ends of the power supply voltage regulation branch, the reference voltage regulation branch and the bandgap reference voltage regulation branch are directly or indirectly connected to the output end of the chip external power supply, so as to perform multi-channel voltage regulation on the chip external power supply.
3. The voltage regulation circuit for a display device according to claim 1, characterized in that: The power supply voltage regulating unit comprises: A global power supply voltage regulation circuit, the input end of which is directly connected to the output end of the chip external power supply, and is used to perform a first level voltage regulation process on the chip external power supply; A local power supply voltage regulation circuit, wherein the input end of the local power supply voltage regulation circuit is connected to the output end of the global power supply voltage regulation circuit, and the local power supply voltage regulation circuit comprises at least one level of local power supply voltage regulation circuit, which is used to perform at least a second level of voltage regulation on the external power supply of the chip.
4. The voltage regulation circuit for a display device according to claim 3, characterized in that: The local power supply voltage regulation circuit includes at least two local power supply voltage regulation circuits, which are used to perform at least two voltage regulation processes on the external power supply of the chip.
5. The voltage regulation circuit for a display device according to claim 3, characterized in that: The power supply voltage regulation unit includes a global power supply voltage regulation circuit, a global reference voltage power supply voltage regulation circuit and a bandgap reference power supply voltage regulation circuit, which are used to perform multi-channel voltage regulation processing on the chip external power supply, wherein the input ends of the global power supply voltage regulation circuit and the bandgap reference power supply voltage regulation circuit are directly connected to the output end of the chip external power supply, which are used to perform the first-level voltage regulation processing on the chip external power supply, and the input end of the global reference voltage power supply voltage regulation circuit is connected to the output end of the chip external power supply or the output end of the global power supply voltage regulation circuit, which is used to perform the first-level or second-level voltage regulation processing on the chip external power supply.
6. The voltage regulating circuit for a display device according to claim 5, characterized in that: The reference voltage signal chain voltage regulating unit comprises: The local reference voltage regulating circuit comprises a multi-stage local reference voltage regulating circuit, each stage of the local reference voltage regulating circuit is electrically connected to the global reference voltage power regulating circuit, and the multi-stage local reference voltage regulating circuit regulates the reference in turn.
7. The voltage regulation circuit according to claim 6, characterized in that: The reference voltage signal chain voltage regulating unit further includes: A bandgap reference circuit, wherein the input end of the bandgap reference circuit is connected to the output end of the bandgap reference power supply voltage regulator circuit, the bandgap reference circuit is used to generate a bandgap reference voltage, the input end of the local reference voltage regulator circuit is connected to the output end of the bandgap reference circuit, and the multi-stage local reference voltage regulator circuit sequentially regulates the bandgap reference voltage output by the bandgap reference circuit.
8. The voltage regulation circuit according to claim 6, characterized in that: The reference voltage signal chain voltage regulating unit further includes: The reference voltage generating circuit comprises a multi-stage reference voltage generating circuit, wherein the input end of each stage of the reference voltage generating circuit is respectively connected to the output end of the local power supply regulating circuit and the output end of the local reference voltage regulating circuit, and the output signal of the local reference voltage regulating circuit serves as the input reference voltage of the reference voltage generating circuit.
9. The voltage regulation circuit according to claim 8, characterized in that: The reference voltage generating circuit at least includes a GAMMA voltage generating circuit, and the GAMMA voltage generating circuit serves as a final-stage reference voltage generating circuit of the multi-stage reference voltage generating circuit.
10. A driver chip for a display device, characterized in that: The invention comprises a voltage regulating circuit for a display device according to any one of claims 1 to 9.