Virtual pixel driving circuit

Abstract

The utility model discloses a virtual pixel driving circuit. The virtual pixel driving circuit comprises a display driving circuit and a pixel array with a plurality of pixel units, the display driving circuit comprises a first row driving chip, a second row driving chip, a red constant-current driving chip, a first green constant-current driving chip, a second green constant-current driving chip and a blue constant-current driving chip; the positive electrode of the red sub-pixel of each pixel unit is connected with one voltage output end of the first row of driving chips, and the positive electrodes of the green sub-pixel, the blue sub-pixel and the virtual green sub-pixel of each pixel unit are jointly connected with one voltage output end of the second row of driving chips. The negative electrodes of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the virtual green sub-pixel are respectively connected with the constant current ends of the red constant current driving chip, the first green constant current driving chip, the blue constant current driving chip and the second green constant current driving chip. The utility model has the advantages of low power consumption and little heat.

Description

Technical Field

[0001] The utility model relates to the field of display screens, in particular to a virtual pixel driving circuit. Background Art

[0002] In current display screens, the common pixel design is to consist of three sub-pixels (including red sub-pixels, green sub-pixels, and blue sub-pixels) to form one pixel for display, and the physical resolution is the visual resolution.

[0003] With the development of LED technology, the brightness of LED displays has continued to increase, while their sizes have become smaller, leading to higher process requirements and costs. Virtual pixels are a technology that significantly improves display quality while maintaining the same hardware requirements. Virtual pixel technology divides a full image into four fields and, utilizing the human eye's persistence, displays all four fields in a single frame, thus achieving a quadruple pixel density. Virtual pixel technology uses pixel units consisting of red, green, blue, and virtual green sub-pixels. Each pixel unit is reused four times, resulting in a virtualized width and height that are both double the size of a real pixel.

[0004] Existing display screens using virtual pixel technology generally use a common anode method to drive each pixel unit (i.e., the same voltage is passed through the positive electrodes of the red sub-pixels, green sub-pixels, blue sub-pixels, and virtual green sub-pixels of the pixel unit). However, since the average forward conduction voltage of the red sub-pixels is approximately 2V, and the average forward conduction voltage of the blue sub-pixels, green sub-pixels, and virtual green sub-pixels is approximately 3V, this results in a large voltage drop across the constant current driver chip connected to the negative electrode of the red sub-pixels, causing the constant current driver chip connected to the negative electrode of the red sub-pixels to generate large heat and consume large power. In addition, the large heat generated by the constant current driver chip connected to the negative electrode of the red sub-pixels may affect the display effect of the display screen.

[0005] In view of the above problems, it is necessary to study a virtual pixel driving circuit, which has the advantages of low power consumption and low heat generation. Utility Model Content

[0006] The purpose of the utility model is to provide a virtual pixel driving circuit, which has the advantages of low power consumption and low heat generation.

[0007] In order to achieve the above objectives, the solution of the present invention is:

[0008] A virtual pixel driving circuit comprises a pixel array and a display driving circuit; the pixel array comprises a plurality of pixel units, each pixel unit comprising a red sub-pixel, a green sub-pixel, a blue sub-pixel and a virtual green sub-pixel; the display driving circuit comprises a first row driving chip, a second row driving chip, a red constant current driving chip, a first green constant current driving chip, a second green constant current driving chip, and a blue constant current driving chip; the positive electrode of the red sub-pixel of each pixel unit is connected to a voltage output terminal of the first row driving chip, the positive electrodes of the green sub-pixel, the blue sub-pixel and the virtual green sub-pixel of each pixel unit are commonly connected to the same voltage output terminal of the second row driving chip, and the negative electrodes of the red sub-pixel, the green sub-pixel, the blue sub-pixel and the virtual green sub-pixel of each pixel unit are respectively connected to a constant current terminal of the red constant current driving chip, the first green constant current driving chip, the blue constant current driving chip and the second green constant current driving chip; the first row driving chip is powered by a first driving power supply, the second row driving chip is powered by a second driving power supply, and the output voltage of the first driving power supply is less than the output voltage of the second driving power supply.

[0009] The output voltage of the first driving power supply is 2.8V; the output voltage of the second driving power supply is 3.8V.

[0010] The display driving circuit also includes signal interfaces connected to the first row driving chip, the second row driving chip, the red constant current driving chip, the first green constant current driving chip, the second green constant current driving chip and the blue constant current driving chip respectively.

[0011] The first row driver chip and the second row driver chip are SM5368PS row driver chips.

[0012] The red constant current driver chip, the first green constant current driver chip, the second green constant current driver chip and the blue constant current driver chip are constant current driver chips of model SM16389N.

[0013] After adopting the above scheme, the utility model controls whether the positive electrode of the red sub-pixel is connected to the voltage through the first row of driver chips, and controls whether the positive electrodes of the green sub-pixels, blue sub-pixels and virtual green sub-pixels are connected to the voltage through the second row of driver chips. The first row of driver chips are powered by the first driver power supply, and the second row of driver chips are powered by the second driver power supply, and the output voltage of the first driver power supply is less than the output voltage of the second driver power supply. In this way, the voltage connected to the positive electrode of the red sub-pixel is reduced, and the voltage drop of the red constant current driver chip connected to the negative electrode of the red sub-pixel can be effectively reduced, thereby reducing the power consumption and heat generation of the red constant current driver chip, so that the virtual pixel driving circuit of the utility model has the advantages of low power consumption and low heat generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a circuit diagram of the utility model.

[0015] Description of labels:

[0016] Red sub-pixel R, green sub-pixel G, blue sub-pixel B, virtual green sub-pixel VG,

[0017] The first row driver chip U1, the second row driver chip U2, the red constant current driver chip U3, the first green constant current driver chip U4, the second green constant current driver chip U5, the blue constant current driver chip U6, the signal interface J1,

[0018] The first driving power supply VCC1 and the second driving power supply VCC2. DETAILED DESCRIPTION

[0019] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0020] like Figure 1 As shown, the utility model discloses a virtual pixel driving circuit, which includes a pixel array and a display driving circuit; the pixel array includes a plurality of pixel units, each pixel unit includes a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B and a virtual green sub-pixel VG; the display driving circuit includes a first row driving chip U1, a second row driving chip U2, a red constant current driving chip U3, a first green constant current driving chip U4, a second green constant current driving chip U5, and a blue constant current driving chip U6; the positive electrode of the red sub-pixel R of each pixel unit is connected to the first A voltage output end of a row of driver chips U1, the positive electrodes of the green sub-pixel G, blue sub-pixel B and virtual green sub-pixel VG of each pixel unit are commonly connected to the same voltage output end of the second row driver chip U2, and the negative electrodes of the red sub-pixel R, green sub-pixel G, blue sub-pixel B and virtual green sub-pixel VG of each pixel unit are respectively connected to a constant current end of the red constant current driver chip U3, the first green constant current driver chip U4, the blue constant current driver chip U6 and the second green constant current driver chip U5; the first row driver chip U1 is powered by the first driving power supply VCC1, and the second row driver chip U2 is powered by the second driving power supply VCC2, and the output voltage of the first driving power supply VCC1 is less than the output voltage of the second driving power supply VCC2.

[0021] In an embodiment of the present invention, the present invention controls whether the positive electrode of the red sub-pixel R is connected to the voltage through the first row driver chip U1, and controls whether the positive electrodes of the green sub-pixel G, the blue sub-pixel B and the virtual green sub-pixel VG are connected to the voltage through the second row driver chip U2. The first row driver chip U1 is powered by the first driver power supply VCC1, the second row driver chip U2 is powered by the second driver power supply VCC2, and the output voltage of the first driver power supply VCC1 is less than the output voltage of the second driver power supply VCC2. In this way, the voltage connected to the positive electrode of the red sub-pixel R is reduced, and the voltage drop of the red constant current driver chip U3 connected to the negative electrode of the red sub-pixel R can be effectively reduced, thereby reducing the power consumption and heat generation of the red constant current driver chip U3, so that the virtual pixel driving circuit of the present invention has the advantages of low power consumption and low heat generation.

[0022] In an embodiment of the present invention, the output voltage of the first driving power supply VCC1 is 2.8V to meet the forward conduction voltage requirement of the red sub-pixel R; the output voltage of the second driving power supply VCC2 is 3.8V to meet the forward conduction voltage requirement of the green sub-pixel G, the blue sub-pixel B and the virtual green sub-pixel VG.

[0023] In an embodiment of the present utility model, the display driving circuit also includes a signal interface J1 connected to the first row driver chip U1, the second row driver chip U2, the red constant current driver chip U3, the first green constant current driver chip U4, the second green constant current driver chip U5 and the blue constant current driver chip U6 respectively. The signal interface J1 is used to input the external first row control signal, the second row control signal, the first column control signal, the second column control signal and the third column control signal to the first row driver chip U1, the second row driver chip U2, the red constant current driver chip U3, the first green constant current driver chip U4, the second green constant current driver chip U5 and the blue constant current driver chip U6 respectively, so as to control the first row driver chip U1, the second row driver chip U2, the red constant current driver chip U3, the first green constant current driver chip U4, the second green constant current driver chip U5 and the blue constant current driver chip U6 respectively.

[0024] In an embodiment of the present invention, the first row driver chip U1 and the second row driver chip U2 may be row driver chips of model SM5368PS.

[0025] In an embodiment of the present invention, the red constant current driver chip U3, the first green constant current driver chip U4, the second green constant current driver chip U5 and the blue constant current driver chip U6 may be constant current driver chips of model SM16389N.

[0026] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A virtual pixel driving circuit, characterized in that: including a pixel array and a display driver circuit; The pixel array includes a plurality of pixel units, each pixel unit includes a red sub-pixel, a green sub-pixel, a blue sub-pixel and a virtual green sub-pixel; The display driving circuit includes a first row driver chip, a second row driver chip, a red constant current driver chip, a first green constant current driver chip, a second green constant current driver chip, and a blue constant current driver chip; the positive electrode of the red sub-pixel of each pixel unit is connected to a voltage output terminal of the first row driver chip, the positive electrodes of the green sub-pixel, blue sub-pixel and virtual green sub-pixel of each pixel unit are commonly connected to the same voltage output terminal of the second row driver chip, and the negative electrodes of the red sub-pixel, green sub-pixel, blue sub-pixel and virtual green sub-pixel of each pixel unit are respectively connected to a constant current terminal of the red constant current driver chip, the first green constant current driver chip, the blue constant current driver chip and the second green constant current driver chip; the first row driver chip is powered by a first driver power supply, and the second row driver chip is powered by a second driver power supply, and the output voltage of the first driver power supply is less than the output voltage of the second driver power supply.

2. The virtual pixel driving circuit according to claim 1, wherein: The output voltage of the first driving power supply is 2.8V; the output voltage of the second driving power supply is 3.8V.

3. The virtual pixel driving circuit according to claim 1, wherein: The display driving circuit also includes signal interfaces connected to the first row driving chip, the second row driving chip, the red constant current driving chip, the first green constant current driving chip, the second green constant current driving chip and the blue constant current driving chip respectively.

4. The virtual pixel driving circuit according to claim 1, wherein: The first row driver chip and the second row driver chip are SM5368PS row driver chips.

5. The virtual pixel driving circuit according to claim 1 , wherein: The red constant current driver chip, the first green constant current driver chip, the second green constant current driver chip and the blue constant current driver chip are constant current driver chips of model SM16389N.

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