RGB-LED display control method and equipment

Abstract

The invention discloses an RGB-LED display control device. The RGB-LED display control device comprises a power supply unit, a power bus, an LED light-emitting unit and an LED driving control unit. The power supply unit comprises three power supply channels which are mutually independent; the power supply bus is used for connecting the power supply unit and the LED light-emitting unit, the LED light-emitting unit comprises three LED light-emitting element channels of RGB, and each LED light-emitting element channel corresponds to one power supply channel; the LED driving control unit is provided with a plurality of LED driving channels, one end of an LED light-emitting element of each LED light-emitting element channel is connected with the power bus, and the other end of the LED light-emitting element of each LED light-emitting element channel is connected with one of the LED driving channels.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED display driving, in particular to an RGB-LED display control method and device. BACKGROUND

[0002] RGB display technology, i.e. display technology with RGB-LED as light source, such as high-end LCD, RGB-Mini LED, etc., is currently in rapid development. Its significant color, brightness and energy efficiency advantages make it a new favorite in the high-end display market. RGB display screens mix various colors by adjusting the brightness of red (R), green (G) and blue (B) light-emitting diodes (LEDs). Due to different materials (such as gallium arsenide, indium gallium phosphide, etc.), the forward voltages (VF) of these LEDs differ, with red LEDs typically being 1.8-2.2V, green LEDs typically being 2.8-3.4V, and blue LEDs typically being 3.0-3.6V. Therefore, the existing display screen circuit wiring has certain complexity, as shown in Figure 1 When driving R, G, and B three-color LED light-emitting elements, the display device in the prior art needs to set three power supply circuits for the three-color LEDs and control them with separate switching devices. The voltage difference leads to the traditional driving method of providing independent power supply lines and current control for each color of LED, which results in complex wiring and area waste.

[0003] Therefore, a new RGB-LED display control method and device are needed in the prior art to make the wiring of the display device more concise. SUMMARY

[0004] The technical purpose of the present application is to provide a new RGB LED display control circuit structure that can solve the problems of complex wiring and area waste of the existing circuit.

[0005] To achieve the above technical purpose, the present application provides an RGB-LED display control device, which comprises a power supply unit, a power bus, an LED light-emitting unit and an LED driving control unit.

[0006] The power supply unit includes three independent power supply channels, each corresponding to RGB three-color LED light-emitting elements. Each power supply channel includes a power supply with a predetermined voltage and a first switching element to control the power supply channel.

[0007] The power bus is used for connecting the power supply unit and the LED light-emitting unit, the LED light-emitting unit comprises three RGB LED light-emitting element channels, each LED light-emitting element channel is provided with an LED light-emitting element and a second switch element, and each LED light-emitting element channel corresponds to a power supply channel, that is, a pair of first switch elements and second switch elements control a group of corresponding power supply channels and LED light-emitting element channels; and when a pair of first switch elements and second switch elements are in the conducting state, the remaining first switch elements and second switch elements are in the cut-off state;

[0008] The LED drive control unit is provided with a plurality of LED drive channels, one end of the LED light-emitting element of each LED light-emitting element channel is connected to the power bus, and the other end is connected to one of the plurality of LED drive channels through the second switch element;

[0009] The R, G and B image components are extracted from the actual display image to obtain the light-emitting timing information and the light-emitting gray scale information of each LED light-emitting element channel; and the timing of the conduction or cut-off of the plurality of pairs of first switch elements and second switch elements is controlled according to the light-emitting timing information;

[0010] And according to the light-emitting gray scale information, the adjustment of the driving current of the LED light-emitting element channel is realized by using the current control function of the LED drive channel.

[0011] The present application can improve the problem of complex wiring and area waste caused by the need to provide independent power supply lines and current control for each color LED due to the different forward conduction voltages of RGB three kinds of lamp beads in the prior art solution by opening the LED lamp bead through the time division multiplexing power bus.

[0012] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art, and will be learned from practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structures particularly pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and together with the embodiments of the present application, serve to explain the present application, and do not constitute a limitation of the present application. In the drawings:

[0014] Figure 1 is a schematic diagram of the RGB-LED drive circuit structure in the prior art;

[0015] Figure 2 is a schematic diagram of the RGB-LED drive circuit structure of the present application. DETAILED DESCRIPTION

[0016] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the accompanying drawings.

[0017] It should be understood that when an element or layer is referred to as being "on", "adjacent", "connected to" or "coupled to" another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer, or one or more intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected to", or "directly coupled to" another element or layer, then there are no intervening elements or layers present. It will be appreciated that, although terms such as first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are simply used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application. Conversely, a second element, component, region, layer or section discussed need not necessarily exist.

[0018] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0019] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0020] Example 1

[0021] As Figure 2 shown, the RGB-LED display control device of the present application comprises a power supply unit 1, a power bus 2, an LED light unit 3 and an LED drive control unit 4.

[0022] The power supply unit 1 comprises three independent power supply channels, each of which corresponds to a RGB LED light element, and each power supply channel comprises a power supply with a predetermined voltage and a first switch element (S1-S3) for controlling the power supply channel.

[0023] The power bus 2 is used to connect the power supply unit 1 and the LED light unit 3, and the LED light unit 3 comprises three RGB LED light element channels, each of which is provided with an LED light element and a second switch element (L1-L3), and each LED light element channel corresponds to a power supply channel, that is, a pair of first and second switch elements controls a group of corresponding power supply channels and LED light element channels. When a pair of first and second switch elements is in a conducting state, the remaining first and second switch elements are in a cut-off state.

[0024] The LED drive control unit 4 is provided with a plurality of LED drive channels, and one end of the LED light element of each LED light element channel is connected to the power bus, and the other end is connected to one of the plurality of LED drive channels through the second switch element.

[0025] In this embodiment, the R, G and B image components are extracted from the actual display image to obtain the light timing information and the light gray scale information of each LED light element channel. According to the light timing information, the timing of the conduction or cut-off of the pairs of first and second switch elements is controlled, and according to the light gray scale information, the adjustment of the drive current of the LED light element channel is realized by using the current control function of the LED drive channel.

[0026] As Figure 2As shown, for example, when the red (R) LED light emitting element is powered according to the light emitting timing information, the positive pole of the red (R) LED light emitting element corresponds to the power supply channel being connected, i.e. the first switch element S1 is closed and conducts electricity, while the negative pole of the red (R) LED light emitting element corresponds to the second switch element L1 being closed and conducting electricity, so that the red (R) LED light emitting element is driven to emit light. The positive poles of the blue (B) LED light emitting element and the green (G) LED light emitting element correspond to the first switch elements S2, S3 being opened and cut off, so that the blue (B) LED light emitting element and the green (G) LED light emitting element cannot form a conducting loop and cannot emit light. At this time, the LED driving control unit 4 controls the gray value of the red (R) LED light emitting element by controlling the current on the LED driving channel LED1.

[0027] The above-described embodiments are merely used to illustrate the technical solutions of the present application, but not limit the present application; even though the present application has been described in detail with reference to the foregoing embodiments, those ordinarily skilled in the art should understand: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An RGB-LED display control device, characterized in that: The RGB-LED display control device includes: a power supply unit, a power bus, an LED light-emitting unit, and an LED driver control unit. The power supply unit includes three independent power supply channels, each corresponding to an RGB three-color LED light-emitting element. Each power supply channel includes a power supply with a predetermined voltage and a first switching element to control the power supply channel. The power bus is used to connect the power supply unit and the LED light-emitting unit. The LED light-emitting unit includes three LED light-emitting element channels (RGB). Each LED light-emitting element channel is equipped with an LED light-emitting element and a second switching element. Each LED light-emitting element channel corresponds to a power supply channel. That is, the first switching element and the second switching element are paired to control a set of corresponding power supply channels and LED light-emitting element channels. When a pair of first switching elements and second switching elements are in the on state, the other first switching elements and second switching elements are in the off state. The LED drive control unit is provided with multiple LED drive channels. One end of the LED light-emitting element of each LED light-emitting element channel is connected to the power bus, and the other end is connected to one of the multiple LED drive channels through a second switching element. The light-emitting timing information of each LED light-emitting element channel is obtained by extracting R, G, and B image components from the actual display image; and the timing of the conduction or cutoff of multiple pairs of first and second switching elements is controlled according to the light-emitting timing information.

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