Display panel

Abstract

The invention discloses a display panel, which comprises a pixel circuit column, a plurality of pixel circuits of the pixel circuit column are divided into a plurality of pixel circuit groups; a plurality of direct current integral signal lines; and a plurality of separate direct current overall power signal lines, the separate direct current overall power signal lines are even independent signal lines, the direct current overall signal lines are coupled to the pixel circuits and the separate direct current overall power signal lines, and the direct current overall signal lines are disconnected among the pixel circuit groups.

Description

Background Art

[0002] Micro LED (μLED) is an emerging display technology that uses microscopic light-emitting diodes as display units. This technology has many advantages, but also faces some challenges.

[0003] The benefits of μLEDs are as follows. (1) High brightness: μLEDs can be several times brighter than traditional OLED (organic light-emitting diode) or LCD (liquid crystal display) displays, making them ideal for use in bright light environments, such as outdoor displays. (2) High contrast: Because μLEDs can control the brightness of each pixel individually, they can achieve extremely high contrast and deeper blacks, providing better display effects. (3) Low power consumption: μLEDs consume less energy than LCDs and OLEDs because each LED only emits light when needed, making them particularly important in portable devices. (4) Long life and durability: μLEDs have high material stability and are not as susceptible to burn-in and life limitations as OLEDs, giving them a longer lifespan. (5) Fast response time: μLEDs have very fast response times, making them suitable for applications that require high-speed displays, such as VR and AR headsets. (6) Stability of inorganic materials: The inorganic materials used in μLEDs, such as gallium nitride (GaN), are not easily degraded over time, which gives μLEDs better environmental stability and reliability.

[0004] At present, the common uses of μLED are: (1) Consumer electronics: μLED can be used in consumer electronics such as smartphones, tablets, and TVs, providing higher quality display effects and lower energy consumption. (2) Wearable devices: The small size and low power consumption of μLED are very suitable for wearable devices such as smart watches and health trackers. (3) Augmented reality (AR) and virtual reality (VR): Due to its high brightness and fast response time, μLED is very suitable for AR and VR displays, providing a more realistic and comfortable immersive experience. (4) Automotive displays: μLED can be used for in-car displays or electronic billboards outside the car, providing clearer and higher brightness display effects. (5) Large displays and commercial signs: μLED can achieve seamless splicing, suitable for large displays and commercial advertising signs, providing high brightness and high contrast display effects.

[0005] μLED panel technology is highly competitive in high-end display applications; therefore, large-size μLED panels will become the mainstream direction of μLED development.

[0006] However, at present, large-size μLED panels encounter the problem of horizontal crosstalk, and this bottleneck has yet to be broken through.

[0007] Figure 1 The horizontal crosstalk problem of the existing μLED panel is shown. The active display area 100 of the μLED panel includes a central high-brightness area (F area) 110 and a low-brightness peripheral area (B area) 120 .

[0008] Table 1 below shows the horizontal crosstalk simulation results of the existing μLED panel.

[0009] Table 1

[0010]

[0011] Therefore, according to simulation analysis, the main causes of horizontal crosstalk are as follows: (1) The total driving current of the active area of ​​the display increases with the increase of the panel size (from the small-size panel 210 to the large-size panel 220) (under a fixed brightness requirement), thereby increasing the voltage drop (IR-drop) between the power supplies VDD and VSS and making the horizontal crosstalk more serious, such as Figure 2A (2) The coupling effect of the data line voltage (Vdata) in the central highlight area (area F) of the display panel 230 is transmitted to the low-brightness surrounding area (area B) through the DC signal line (such as the reference voltage line Vref, etc.) in the panel, thereby interfering with the write voltage of the μLED pixel and making the horizontal crosstalk more serious, as shown in FIG. Figure 2B shown.

[0012] Therefore, the industry needs a method that can reduce the horizontal crosstalk problem while still taking into account the uniformity of panel display brightness. Summary of the invention

[0013] According to a first aspect of the present invention, a display panel is proposed, comprising: a pixel circuit column, wherein a plurality of pixel circuits of the pixel circuit column are divided into a plurality of pixel circuit groups; a plurality of DC overall signal lines; and a plurality of separate DC overall power signal lines, wherein the separate DC overall power signal lines are independent signal lines, wherein the DC overall signal lines are coupled to the pixel circuits and the separate DC overall power signal lines, and the DC overall signal lines are disconnected between the pixel circuit groups.

[0014] According to a second aspect of the present invention, a display panel is proposed, comprising: a plurality of pixel circuit columns, wherein the plurality of pixel circuits of the pixel circuit columns are divided into a plurality of pixel circuit groups; a plurality of DC overall signal lines; and a plurality of separate DC overall power signal lines, wherein the separate DC overall power signal lines are independent signal lines, wherein the DC overall signal lines are coupled to the pixel circuits and the separate DC overall power signal lines, and the DC overall signal lines are disconnected between the pixel circuit groups.

[0015] In order to better understand the above and other aspects of the present invention, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Showing the horizontal crosstalk problem of existing μLED panels.

[0017] Figure 2A and Figure 2B It is shown that due to the data voltage coupling effect of the prior art, the writing voltage of the μLED pixel is interfered and the horizontal crosstalk is made more serious.

[0018] Figure 3 A schematic diagram of a display panel according to an embodiment of the present invention is shown.

[0019] Figure 4 A circuit diagram of a pixel circuit according to an embodiment of the present invention is shown.

[0020] Figure 5 A horizontal crosstalk simulation diagram according to an embodiment of the present invention is shown.

[0021] Wherein, the reference numerals are:

[0022] 100: Display active area

[0023] 110: Center highlight area

[0024] 120: Low light surrounding area

[0025] 210: Small size panel

[0026] 220: Large size panel

[0027] 230: Display panel

[0028] 300: Display panel

[0029] P: Pixel circuit

[0030] 310: Data signal line

[0031] 320: Gate drive signal line

[0032] 330: DC integral signal line

[0033] 340, 340_1~340_N: Separate DC integral power signal line

[0034] P_1~P_N: pixel circuit group

[0035] 360: Disconnect

[0036] 410: Main function circuit

[0037] 420: Light-emitting timing control circuit

[0038] 430: Array test circuit

[0039] M: driver transistor

[0040] 440: Light-emitting element (μLED)

[0041] SN1(n), SNm(n): scanning signal

[0042] Vdata: data signal

[0043] EM(n):luminescent signal

[0044] Vref1, Vref2: reference voltage

[0045] AT: Array test signal DETAILED DESCRIPTION

[0046] The technical terms used in this specification refer to the customary terms in the technical field. If some terms are explained or defined in this specification, the interpretation of these terms shall be based on the explanation or definition in this specification. Each embodiment of the present disclosure has one or more technical features. Under the premise of possible implementation, a person with ordinary knowledge in the technical field can selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

[0047] Figure 3 The display panel 300 according to one embodiment of the present invention comprises: a plurality of pixel circuits P, a plurality of data signal lines 310 , a plurality of gate drive signal lines 320 , a plurality of DC integral signal lines 330 and a plurality of separate DC integral power signal lines 340 .

[0048] The pixel circuits P are divided into a plurality of pixel circuit groups in the horizontal direction. For example, but not limited to, the number of pixel circuit groups is less than or equal to the total number of signal lines of the separated DC overall power signal lines 340. Figure 3 For ease of understanding, the number of pixel circuit groups and the number of signal lines of the separate DC integrated power signal lines 340 are both N (N is a positive integer, N is greater than or equal to 10). Figure 3In the figure, P_1-P_N represent the pixel circuit groups, and 340_1-340_N represent the separate DC overall power signal lines 340, wherein the separate DC overall power signal lines 340 are independent signal lines. For example but not limited to, each column of pixel circuits of the display panel has 1000 pixel circuits P, then when divided into 10 groups, each of the pixel circuit groups P_1-P_10 includes 100 pixel circuits P. In addition, Figure 3 It can also be seen that the display panel 300 includes a plurality of columns of pixel circuits.

[0049] The data signal lines 310 are coupled to the pixel circuits P for receiving data signals (Vdata) provided by a source driving circuit (not shown).

[0050] The gate driving signal lines 320 are coupled to the pixel circuits P to receive gate driving signals (such as but not limited to, scanning signals, light emitting signals, etc.) provided by a gate driving circuit (not shown).

[0051] The DC overall signal lines 330 are coupled to the pixel circuits P and the separate DC overall power signal lines 340. The DC overall signal lines 330 are used to receive the DC overall signals provided by the separate DC overall power signal lines 340, such as but not limited to, reference voltages, array test signals, etc., and the DC overall signal lines 330 provide the received DC overall signals (such as but not limited to, reference voltages, array test signals, etc.) to the pixel circuits P.

[0052] The signal sources of the separated DC integrated power signal lines 340 need to be independent and not interfere with each other.

[0053] like Figure 3 As shown, in one embodiment of the present case, the DC overall signal lines 330 are disconnected between the pixel circuit groups P_1 to P_N, as shown by reference symbol 360. The DC overall signal lines 330 are coupled to the separated DC overall power signal lines 340 to block the coupling path of the data signal (Vdata), so that the brightness of the display panel 300 can be further improved without affecting the horizontal crosstalk performance. In addition, the gate drive signal lines 320 are maintained connected between the pixel circuit groups P_1 to P_N.

[0054] In addition, in an embodiment of the present invention, the pixel circuit P can apply an NMOS type μLED pixel circuit and a PMOS type μLED pixel circuit, which are all within the spirit and scope of the present invention.

[0055] Figure 4A circuit diagram of a pixel circuit according to an embodiment of the present invention is shown. The pixel circuit P includes: a main function circuit 410, a light-emitting timing control circuit 420, an array test circuit 430, a driving transistor M and a light-emitting element (μLED) 440. The details of the main function circuit 410, the light-emitting timing control circuit 420, the array test circuit 430, the driving transistor M and the light-emitting element (μLED) 440 may not be particularly limited here. Among them, SN1(n) and SNm(n) are scan signals, Vdata is a data signal, and EM(n) is a light-emitting signal.

[0056] The reference voltages Vref1 and Vref2 received by the main function circuit 410 and the array test signal AT received by the array test circuit 430 are DC overall signals.

[0057] In one embodiment of the present invention, when the DC overall signal lines 330 are disconnected between the pixel circuit groups P_1 to P_N, one or more signals may be selected to be disconnected. For example, but not limited to, between the pixel circuit groups P_1 to P_N, at least one of the reference voltage Vref1, the reference voltage Vref2 and the array test signal AT is disconnected, and the others may remain connected, which is also within the spirit of the present invention.

[0058] Figure 5 A horizontal crosstalk simulation diagram according to an embodiment of the present invention is shown. Figure 5 It can be seen that in one embodiment of the present case, the brightness uniformity (U%) can be further improved by reducing the signal line impedance without affecting the horizontal crosstalk.

[0059] Professionals in the technical field may use different methods to implement the functions described in each specific application, but it should not be considered that such implementation exceeds the scope of this application.

[0060] Although many specific details may be described in this case, these should not be understood as limiting the scope of the claimed invention, but should be regarded as descriptions of the characteristics of specific embodiments. In the description of this case, certain features described in the context of a single embodiment may also be implemented in a single embodiment in combination. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments alone or in any appropriate sub-combination. In addition, although a feature may initially be described as working in certain combinations, or even initially described as such a combination, in some cases one or more features may be deleted from the combination, and the described combination may be for a sub-combination or a variation of a sub-combination. Similarly, although operations are depicted in the diagrams as being performed in a particular order, this should not be understood as requiring that these operations must be performed in the particular order or sequence shown, or that all depicted operations must be performed to achieve the desired result.

[0061] Although the above embodiments of the present invention only disclose some examples and implementations, the examples and implementations and other implementations may be changed, modified and enhanced according to the disclosed content.

[0062] In summary, although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. A person having ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A display panel, characterized in that: include: a pixel circuit column, wherein a plurality of pixel circuits in the pixel circuit column are divided into a plurality of pixel circuit groups; Multiple DC integral signal lines; and A plurality of separate DC integral power signal lines, wherein the separate DC integral power signal lines are independent signal lines, in, The DC overall signal lines are coupled to the pixel circuits and the separate DC overall power signal lines, and The DC overall signal lines are disconnected between the pixel circuit groups.

2. The display panel according to claim 1, wherein: in, The number of the pixel circuit groups is less than or equal to the total number of signal lines of the separated DC integral power signal lines.

3. The display panel according to claim 1, wherein: in, The DC integral signal lines receive a plurality of DC integral signals provided by the separate DC integral power signal lines, and The DC overall signal lines provide the received DC overall signals to the pixel circuits.

4. The display panel according to claim 1, wherein: in, The signal sources of the separated DC integral power signal lines are independent of each other and do not interfere with each other.

5. The display panel according to claim 1, wherein: It further includes a plurality of gate driving signal lines coupled to the pixel circuits, wherein the gate driving signal lines maintain connection between the pixel circuit groups. The DC overall signal lines include at least one reference voltage and an array test signal. Between the pixel circuit groups, at least one of the at least one reference voltage and the array test signal is disconnected.

6. A display panel, characterized in that: include: A plurality of pixel circuit columns, wherein the plurality of pixel circuits in the pixel circuit columns are divided into a plurality of pixel circuit groups; Multiple DC integral signal lines; and A plurality of separate DC integral power signal lines, wherein the separate DC integral power signal lines are independent signal lines, in, The DC overall signal lines are coupled to the pixel circuits and the separate DC overall power signal lines, and The DC overall signal lines are disconnected between the pixel circuit groups.

7. The display panel according to claim 6, wherein: in, The number of the pixel circuit groups is less than or equal to the total number of signal lines of the separated DC integral power signal lines.

8. The display panel according to claim 6, wherein: in, The DC integral signal lines receive a plurality of DC integral signals provided by the separate DC integral power signal lines, and The DC overall signal lines provide the received DC overall signals to the pixel circuits.

9. The display panel according to claim 6, wherein: in, The signal sources of the separated DC integral power signal lines are independent of each other and do not interfere with each other.

10. The display panel according to claim 6, wherein: It further includes a plurality of gate driving signal lines coupled to the pixel circuits, wherein the gate driving signal lines maintain connection between the pixel circuit groups. The DC overall signal lines include at least one reference voltage and an array test signal. Between the pixel circuit groups, at least one of the at least one reference voltage and the array test signal is disconnected.

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