Display device

Abstract

The invention discloses a display device. The display device comprises a plurality of pixel circuits, a time schedule controller and a plurality of display driving circuits. The pixel circuits are divided into a plurality of pixel groups, and each of the pixel groups has a first color light emitting diode, a second color light emitting diode, and a third color light emitting diode. The timing controller provides a plurality of display data. The display driving circuit correspondingly drives the pixel circuits in the corresponding pixel groups to sequentially light one of the first color light emitting diode, the second color light emitting diode and the third color light emitting diode in a plurality of lighting periods based on the corresponding display data. During each lighting period, the pixel group alternately lights a portion of the first color light emitting diodes, a portion of the second color light emitting diodes, and a portion of the third color light emitting diodes.

Description

Technical Field

[0001] The present invention relates to a display device, and more particularly to a display device having a pixel circuit of a light-emitting element. Background Art

[0002] In recent years, self-luminous display technology has become the mainstream of display devices due to its advantages such as low power consumption, thinner display panels, brighter colors, more obvious contrast, etc., in addition to overcoming the problem of motion blur. The light-emitting elements currently used in self-luminous display technology are mainly organic light-emitting diodes (OLED), sub-millimeter light-emitting diodes (Mini LED) and micro light-emitting diodes (Micro LED).

[0003] Taking sub-millimeter LEDs and micro LEDs as examples, both are made (or formed) using compound semiconductors. In order to make LED elements such as sub-millimeter LEDs and micro LEDs have better electro-optical conversion efficiency, the LED elements will be used at a specific current density, that is, the current density used by LEDs of different colors (such as red, green, blue, etc.) will be different. In order to reduce the maximum current load of the system, the color rotation light emission method is often adopted. However, since different colors of LEDs use different current densities, the instantaneous brightness of LEDs of different colors will also be different, resulting in flickering of brightness in static images. Moreover, the invisible brightness flicker will still cause visual fatigue to the human eye after long-term use. Summary of the invention

[0004] The invention provides a display device which can reduce the flickering of a pixel circuit with light emitting diodes of different colors in a display picture.

[0005] The display device of the present invention includes a plurality of pixel circuits, a timing controller, and a plurality of display driving circuits. The pixel circuits are arranged in an array and divided into a plurality of pixel groups, and each pixel circuit has a first color light emitting diode, a second color light emitting diode, and a third color light emitting diode. The timing controller is used to provide a plurality of display data. The display driving circuit is arranged in an array and is respectively coupled to the timing controller and a corresponding one of the pixel circuits, so as to drive the pixel circuits in the corresponding pixel group to sequentially light up the first color light emitting diode, the second color light emitting diode, and one of the third color light emitting diodes in a plurality of lighting periods based on the corresponding one of the display data. During each lighting period, the pixel group alternately lights up a portion of the first color light emitting diode, a portion of the second color light emitting diode, and a portion of the third color light emitting diode.

[0006] Based on the above, in the display device of the embodiment of the present invention, in one lighting period, among all pixel groups, part of the first color LEDs are lit, part of the second color LEDs are lit, and part of the third color LEDs are lit, so that in different but adjacent pixel groups, the light emission sequence of the first color LEDs, the second color LEDs and the third color LEDs is staggered, thereby improving the brightness of different positions of the display panel on the time axis. The stability can reduce the visual fatigue caused by viewing the user.

[0007] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. 4 is a system diagram of a display device according to an embodiment of the present invention.

[0009] Figure 2A FIG. 4 is a schematic diagram showing the lighting distribution of a pixel group of a display device according to an embodiment of the present invention.

[0010] Figure 2B to Figure 2D FIG. 4 is a schematic diagram of lighting distribution of a pixel group of a display device in different lighting periods according to an embodiment of the present invention.

[0011] Figure 2E FIG. 4 is a schematic diagram of lighting brightness distribution of a pixel group of a display device according to an embodiment of the present invention.

[0012] Figure 3 FIG. 4 is a schematic diagram showing the lighting distribution of a pixel group of a display device according to another embodiment of the present invention.

[0013] Figure 4 FIG. 4 is a schematic diagram showing the lighting distribution of a pixel group of a display device according to another embodiment of the present invention.

[0014] Figure 5 FIG. 4 is a schematic diagram of a data format of display data of a display device according to an embodiment of the present invention.

[0015] Figure 6 FIG. 4 is a circuit diagram of a display driving circuit of a display device according to an embodiment of the present invention.

[0016] Figure 7 FIG. 4 is a circuit diagram of a current sink circuit of a display driving circuit of a display device according to an embodiment of the present invention.

[0017] Wherein, the reference numerals are:

[0018] 100: Display device

[0019] 110: Timing controller

[0020] 111: Color sequence judgment module

[0021] 120_11~120_1n、120_m1~120_mn、200:Display driver circuit

[0022] 210: Frequency Converter

[0023] 220: Token Transmission Circuit

[0024] 230: Data receiving circuit

[0025] 240: Drive control circuit

[0026] 241: Sequential Selector

[0027] 242: Duty cycle counter

[0028] 243: Current level selector

[0029] 250: Driving multiplex circuit

[0030] 260: Duty cycle switching circuit

[0031] 270, 271: Current sink circuit

[0032] A0~A10、B0~B47、C0~C47、D0~D47:Bit

[0033] B11, B12, B21, B22: Blue LED

[0034] CLK: clock signal

[0035] CLKi: internal clock signal

[0036] CNT1, CNT2, CNT3: Current data

[0037] CS0: First current source

[0038] CS1: Second current source

[0039] CS2: The third current source

[0040] Duty: Work slot

[0041] Duty11~Duty13, Duty21~Duty23, Duty31~Duty33, Duty41~Duty43: Work slots

[0042] G11, G12, G21, G22: Green LED

[0043] GND: Ground voltage

[0044] Header: Header field

[0045] I0: First current

[0046] I1: Second current

[0047] I2: The third current

[0048] Isub: current

[0049] L avg : Average instantaneous brightness

[0050] L R , L G , L B : Instant brightness

[0051] LV1: Current level

[0052] PG11~PG1n, PG21~PG2n, PG31~PG3n, PG41~PG4n, PG51~PG5n, PG61~PG6n, PGm1~PGmn: pixel group

[0053] PX1~PX4: Pixel circuit

[0054] R11, R12, R21, R22: Red light emitting diodes

[0055] REG1: First register

[0056] REG2: Second register

[0057] REG3: The third register

[0058] Reset: Reset signal

[0059] SE: Sequential Data

[0060] SW0: First current switch

[0061] SW1: Second current switch

[0062] SW2: The third current switch

[0063] t0~t 12 : Time point

[0064] Token: Timing Token

[0065] Vdata_1~Vdata_n, Vdata: display data

[0066] VDD: system high voltage

[0067] Vin: input voltage

[0068] Vref: reference voltage

[0069] XDuty: Duty cycle data DETAILED DESCRIPTION

[0070] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0071] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

[0072] 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 in this article, these elements, components, regions, 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, the "first element", "component", "region", "layer" or "part" discussed below can be referred to as a second element, component, region, layer or part without departing from the teachings of this article.

[0073] The terms used herein are only for the purpose of describing specific embodiments and are not restrictive. As used herein, unless the content clearly indicates, the singular forms "a", "an" and "the" are intended to include plural forms, including "at least one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more related listed items. It should also be understood that when used in this specification, the terms "include" and / or "comprise" specify the presence and / or parts of the features, regions, entireties, steps, operations, elements, but do not exclude the presence or addition of one or more other features, regions, entireties, steps, operations, elements, parts and / or their combinations.

[0074] Figure 1 is a system diagram of a display device according to an embodiment of the present invention. Figure 1In this embodiment, the display device 100 includes a timing controller 110, a plurality of pixel circuits (such as PX1-PX4), and a plurality of display driving circuits (120_11-120_1n, 120_m1-120_mn), wherein m and n are independent of each other and are respectively positive integers, and the timing controller 110 is used to provide a plurality of display data (such as Vdata_1-Vdata_n). The pixel circuits (PX1-PX4) are arranged in an array and divided into a plurality of pixel groups (PG11-PG1n, PGm1-PGmn), and each pixel circuit (such as PX1-PX4) has red light emitting diodes R11, R12, R21, R22 (corresponding to the first color light emitting diode), green light emitting diodes G11, G12, G21, G22 (corresponding to the second color light emitting diode), and blue light emitting diodes B11, B12, B21, B22 (corresponding to the third color light emitting diode).

[0075] In the present embodiment, the display driving circuits (such as 120_11~120_1n, 120_m1~120_mn) are arranged in an array and are respectively coupled to the timing controller 110, wherein each display driving circuit (120_11~120_1n, 120_m1~120_mn) corresponds to a pixel group (PG11~PG1n, PGm1~PGmn), for example, the display driving circuit 120_11 corresponds to the pixel group PG11, and the display driving circuit 120_12 corresponds to the pixel group PG12, and the rest are shown in the reference diagram and will not be repeated here.

[0076] Each display driving circuit (such as 120_11~120_1n, 120_m1~120_mn) is coupled to at least one pixel circuit (herein, four pixel circuits PX1~PX4 are taken as an example, but the embodiments of the present invention are not limited to this) in the corresponding pixel group (such as PG11~PG1n, PGm1~PGmn) to drive each pixel circuit (such as PX1~PX4) in the corresponding pixel group (such as PG11~PG1n, PGm1~PGmn) based on a corresponding one of the display data (such as Vdata_1~Vdata_n) to sequentially light up one of the red light-emitting diodes (such as R11, R12, R21, R22), the green light-emitting diodes (such as G11, G12, G21, G22), and the blue light-emitting diodes (such as B11, B12, B21, B22) during multiple lighting periods.

[0077] Moreover, during each lighting period, in all pixel groups (such as PG11~PG1n, PGm1~PGmn), there are red light-emitting diodes (such as R11, R12, R21, R22) that are lit alternately, green light-emitting diodes (such as G11, G12, G21, G22) that are lit alternately, and blue light-emitting diodes (such as B11, B12, B21, B22) that are lit alternately.

[0078] According to the above, in one lighting period, in all pixel groups, some light up red LEDs, some light up green LEDs, and some light up blue LEDs, so that in different but adjacent pixel groups, the lighting order of red LEDs, green LEDs, and blue LEDs is staggered, and the brightness of different positions of the display panel on the time axis is improved to be stable, thereby reducing visual fatigue caused by viewing by users. In addition, without increasing the pulse width modulation (PWM) frequency, the lighting frequency can be increased by approximately 3 times.

[0079] In the present embodiment, each display driving circuit (120_11-120_1n, 120_m1-120_mn) is coupled to the cathodes of the red light emitting diodes R11, R12, R21, R22, the cathodes of the green light emitting diodes G11, G12, G21, G22, and the cathodes of the blue light emitting diodes B11, B12, B2 of the pixel circuits PX1-PX4 in a corresponding pixel group (PG11-PG1n, PGm1-PGmn). 1, B22, and the anodes of the red light emitting diodes R11, R12, R21, R22 of the pixel circuits PX1~PX4 in all pixel groups (PG11~PG1n, PGm1~PGmn), the anodes of the green light emitting diodes G11, G12, G21, G22, and the anodes of the blue light emitting diodes B11, B12, B21, B22 are commonly coupled (receive) the system high voltage VDD, but the embodiments of the present invention are not limited thereto.

[0080] In this embodiment, the timing controller 110 is further coupled to (receives) a ground voltage GND, and can further provide a reset signal Reset, a timing token Token, and a clock signal CLK, wherein the reset signal Reset is used to reset the display driving circuit (such as 120_11-120_1n, 120_m1-120_mn), and the clock signal CLK is used as a reference for the operation of the display driving circuit (such as 120_11-120_1n, 120_m1-120_mn). The timing token Token is transmitted row by row through the display driving circuit (such as 120_11-120_1n, 120_m1-120_mn) to start the display driving circuit (such as 120_11-120_1n, 120_m1-120_mn) row by row. For example, the display driving circuit 120_11 is activated upon receiving the timing token Token from the timing controller 110, and then sets the lighting mode (e.g., lighting time sequence, lighting time sequence of the light emitting diodes) of the red light emitting diodes R11, R12, R21, R22, the green light emitting diodes G11, G12, G21, G22, and the blue light emitting diodes B11, B12, B21, B22 of the pixel group PG11 according to the display data Vdata_1 from the timing controller 110. The current level of the tube, the length of time it is lit), and then the driving circuit 120_11 provides a timing token to the next level display driving circuit (such as 120_11~120_1n, 120_m1~120_mn) to start the next level display driving circuit (such as 120_11~120_1n, 120_m1~120_mn). The remaining display driving circuits (such as 120_11~120_1n, 120_m1~120_mn) are roughly the same and will not be repeated here.

[0081] In this embodiment, the timing controller 110 may include a color sequence determination module 111 to determine the timing of lighting up the anodes of the red light-emitting diodes R11, R12, R21, R22, the anodes of the green light-emitting diodes G11, G12, G21, G22, or the blue light-emitting diodes B11, B12, B21, B22 in the pixel circuits PX1~PX4 of each pixel group (PG11~PG1n, PGm1~PGmn).

[0082] Figure 2A FIG. 4 is a schematic diagram showing the lighting pattern distribution of a pixel group of a display device according to an embodiment of the present invention. Figure 2B to Figure 2D FIG. 1 is a schematic diagram of the lighting distribution of a pixel group of a display device in different lighting periods according to an embodiment of the present invention. Figure 1 as well as Figures 2A to 2DIn this embodiment, the pixel groups in the same row (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44) belong to the same lighting pattern, but the pixel groups in adjacent rows (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44) are classified as different lighting patterns. Specifically, the first row of pixel groups (such as PG11-PG14) are lighting pattern 1, the second row of pixel groups (such as PG21-PG24) are lighting pattern 2, the third row of pixel groups (such as PG31-PG34) are lighting pattern 3, the fourth row of pixel groups (such as PG41-PG44) are lighting pattern 1, and the rest are similar.

[0083] like Figure 2B As shown, in the first lighting period, the first row of pixel groups (such as PG11-PG14) lights up the red LEDs R11, R12, R21, and R22, the second row of pixel groups (such as PG21-PG24) lights up the green LEDs G11, G12, G21, and G22, the third row of pixel groups (such as PG31-PG34) lights up the blue LEDs B11, B12, B21, and B22, the fourth row of pixel groups (such as PG41-PG44) lights up the red LEDs R11, R12, R21, and R22, and the rest are similar.

[0084] like Figure 2C As shown, the first row of pixel groups (such as PG11 to PG14) light up the green LEDs G11, G12, G21, and G22, the second row of pixel groups (such as PG21 to PG24) light up the blue LEDs B11, B12, B21, and B22, the third row of pixel groups (such as PG31 to PG34) light up the red LEDs R11, R12, R21, and R22, the fourth row of pixel groups (such as PG41 to PG44) light up the green LEDs G11, G12, G21, and G22, and the rest are similar.

[0085] like Figure 2D As shown, the first row of pixel groups (such as PG11 to PG14) light up the blue LEDs B11, B12, B21, and B22, the second row of pixel groups (such as PG21 to PG24) light up the red LEDs R11, R12, R21, and R22, the third row of pixel groups (such as PG31 to PG34) light up the green LEDs G11, G12, G21, and G22, the fourth row of pixel groups (such as PG41 to PG44) light up the blue LEDs B11, B12, B21, and B22, and the rest are similar.

[0086] According to the above, the red LEDs (e.g., R11, R12, R21, R22), green LEDs (e.g., G11, G12, G21, G22), or blue LEDs (e.g., B11, B12, B21, B22) lit up in each pixel group (e.g., PG11-PGmn) during each lighting period are the same as the red LEDs (e.g., R11, R12, R21, R22), green LEDs (e.g., G11, G12, G21, G22), or blue LEDs (e.g., B11, B12, B21, B22) lit up in a horizontally adjacent pixel group (e.g., PG11-PGmn).

[0087] Figure 2E FIG. 1 is a schematic diagram of the lighting brightness distribution of a pixel group of a display device according to an embodiment of the present invention. Figure 1 as well as Figures 2A to 2E In this embodiment, in order to achieve a better electro-optical conversion efficiency, the current level LV1 of the red light emitting diode (such as R11, R12, R21, R22), the current level LV2 of the green light emitting diode (such as G11, G12, G21, G22), and the current level LV3 of the blue light emitting diode (such as B11, B12, B21, B22) are different, that is, the instantaneous brightness L of the red light emitting diode (such as R11, R12, R21, R22) is different. R Corresponding to the current level LV1, the instantaneous brightness L of the green light-emitting diode (such as G11, G12, G21, G22) when it is lit G Corresponding to the current level LV2, the instantaneous brightness L of the blue light-emitting diode (such as B11, B12, B21, B22) is lit B Corresponding to the current level LV3. In addition, the instantaneous brightness L of the red LEDs (such as R11, R12, R21, R22), the green LEDs (such as G11, G12, G21, G22), and the blue LEDs (such as B11, B12, B21, B22) is lit. R , L G , L B It will be different.

[0088] Moreover, at time points t0 to t 12As shown in the multiple lighting periods separated by the intervals, the red LEDs (such as R11, R12, R21, R22), the green LEDs (such as G11, G12, G21, G22), and the blue LEDs (such as B11, B12, B21, B22) are lit alternately. More specifically, during the time period t0-t1, the red LEDs (such as R11, R12, R21, R22) are lit in the pixel groups of the 1st, 4th, ... rows (such as PG11-PG1n, PG41-PG4n, ...), the green LEDs (such as G11, G12, G21, G22) are lit in the pixel groups of the 2nd, 5th, ... rows (such as PG21-PG2n, PG51-PG5n, ...), and the blue LEDs (such as G11, G12, G21, G22) are lit in the pixel groups of the 3rd, 6th, ... rows. In the pixel groups (such as PG31-PG3n, PG61-PG6n, ...), the blue LEDs (such as B11, B12, B21, B22) are lit; during the time point t1-t2, in the pixel groups of the 1st, 4th, ... rows (such as PG11-PG1n, PG41-PG4n, ...), the green LEDs (such as G11, G12, G21, G22) are lit, and in the pixel groups of the 2nd, 5th, ... rows (such as PG21-PG2n , PG51~PG5n, ...) light up the blue LEDs (such as B11, B12, B21, B22), and the pixel groups in the 3rd, 6th, ... rows (such as PG31~PG3n, PG61~PG6n, ...) light up the red LEDs (such as R11, R12, R21, R22); during the time point t2~t3, the pixel groups in the 1st, 4th, ... rows (such as PG11~PG1n, PG41~PG4n, ...) light up the red LEDs (such as R11, R12, R21, R22). The blue LEDs (such as B11, B12, B21, B22) are lit, the red LEDs (such as R11, R12, R21, R22) are lit in the pixel groups of the 2nd, 5th, ... rows (such as PG21~PG2n, PG51~PG5n, ...), and the green LEDs (such as G11, G12, G21, G22) are lit in the pixel groups of the 3rd, 6th, ... rows (such as PG31~PG3n, PG61~PG6n, ...). The rest can be referred to Figure 2E As shown, no further details will be given here.

[0089] During each lighting period (such as between time points t0-t1, t1-t2, ..., etc.), red LEDs (such as R11, R12, R21, R22), green LEDs (such as G11, G12, G21, G22), and blue LEDs (such as B11, B12, B21, B22) are lit in different pixel groups (such as PG11-PG1n, PG21-PG2n, PG31-PG3n, PG41-PG4n, PG51-PG5n, PG61-PG6n, ...), so the average instantaneous brightness L avg will remain essentially consistent.

[0090] Figure 3 FIG. 1 is a schematic diagram showing the lighting distribution of a pixel group of a display device according to another embodiment of the present invention. Figure 1 , Figure 2A as well as Figure 3 In this embodiment, the pixel groups in the same row (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44) belong to the same lighting pattern, but the pixel groups in adjacent rows (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44) are classified as different lighting patterns. Specifically, the first row of pixel groups (such as PG11-PG41) is lighting pattern 1, the second row of pixel groups (such as PG12-PG42) is lighting pattern 2, the third row of pixel groups (such as PG13-PG43) is lighting pattern 3, the fourth row of pixel groups (such as PG41-PG44) is lighting pattern 1, and the rest are similar.

[0091] That is to say, the red LEDs (such as R11, R12, R21, R22), green LEDs (such as G11, G12, G21, G22), or blue LEDs (such as B11, B12, B21, B22) lit up in each pixel group (such as PG11 to PGmn) during each lighting period are the same as the red LEDs (such as R11, R12, R21, R22), green LEDs (such as G11, G12, G21, G22), or blue LEDs (such as B11, B12, B21, B22) lit up in a vertically adjacent pixel group (such as PG11 to PGmn).

[0092] Figure 4 FIG. 1 is a schematic diagram showing the lighting distribution of a pixel group of a display device according to another embodiment of the present invention. Figure 1 , Figure 2A as well as Figure 4In this embodiment, the pixel groups (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44) that are arranged in an upper left and lower right oblique row belong to the same lighting pattern, but the adjacent pixel groups (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44) are classified as different lighting patterns. Specifically, the pixel groups PG11, PG22, PG33, PG44, PG14, PG41, ..., etc. are lighting pattern 1, the pixel groups PG12, PG23, PG34, PG31, PG42, ..., etc. are lighting pattern 2, the pixel groups PG13, PG24, PG21, PG32, PG43, are lighting pattern 3, and the rest are similar.

[0093] That is to say, the red LEDs (such as R11, R12, R21, R22), green LEDs (such as G11, G12, G21, G22), or blue LEDs (such as B11, B12, B21, B22) lit up in each lighting period of each pixel group (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44) are the same as the red LEDs (such as R11, R12, R21, R22), green LEDs (such as G11, G12, G21, G22), or blue LEDs (such as B11, B12, B21, B22) lit up in an obliquely adjacent pixel group (such as PG11-PG14, PG21-PG24, PG31-PG34, PG41-PG44).

[0094] Figure 5 FIG. 1 is a schematic diagram of the data format of display data of a display device according to an embodiment of the present invention. Figure 1 and Figure 5 In the present embodiment, each display data (such as Vdata_1~Vdata_n) includes a header field Header (here taking 11 bits A0~A10 as an example) and a working field part Duty (here taking 144 bits B0~B47, C0~C47, D0~D47 as an example), and the working field part Duty includes a plurality of working fields Duty11~Duty13, Duty21~Duty23, Duty31~Duty33, and Duty41~Duty43.

[0095] In the present embodiment, bits A0-A1 (i.e., sequence data SE) of the header field Header determine the lighting sequence of the red LEDs R11, R12, R21, R22, the green LEDs G11, G12, G21, G22, and the blue LEDs B11, B12, B21, B22 in each pixel group (e.g., PG11-PG1n, PGm1-PGmn), that is, determine whether each pixel group (e.g., PG11-PG1n, PGm1-PGmn) lights up the red LEDs R11, R12, R21, R22, lights up the green LEDs G11, G12, G21, G22, or lights up the blue LEDs B11, B12, B21, B22 during each lighting period.

[0096] In addition, bits A2 to A4 (i.e., current data CNT1) of the header field Header determine the current levels of the red LEDs (e.g., R11, R12, R21, R22), the green LEDs (e.g., G11, G12, G21, G22), and the blue LEDs (e.g., B11, B12, B21, B22) that are lit first in sequence; bits A5 to A7 (i.e., current data CNT2) of the header field Header determine the current levels of the red LEDs (e.g., R11, R12, R21, R22), the green LEDs (e.g., G11, G12, G21, G22), and the blue LEDs (e.g., B11, B12, B21, B22) that are lit first in sequence. The bits A8 to A10 (i.e., the current data CNT3) of the header field Header determine the current levels of the light emitting diodes of the same color that are lit up in the second sequence among the red light emitting diodes (such as R11, R12, R21, R22), the green light emitting diodes (such as G11, G12, G21, G22), and the blue light emitting diodes (such as B11, B12, B21, B22). The bits A8 to A10 (i.e., the current data CNT3) of the header field Header determine the current levels of the light emitting diodes of the same color that are lit up in the third sequence among the red light emitting diodes (such as R11, R12, R21, R22), the green light emitting diodes (such as G11, G12, G21, G22), and the blue light emitting diodes (such as B11, B12, B21, B22).

[0097] Furthermore, the working fields Duty11-Duty13, Duty21-Duty23, Duty31-Duty33, and Duty41-Duty43 respectively determine the current pulse widths for lighting up the red light-emitting diodes R11, R12, R21, and R22, the green light-emitting diodes G11, G12, G21, and G22, and the blue light-emitting diodes B11, B12, B21, and B22 in the pixel circuits PX1-PX4 in each pixel group (such as PG11-PG1n, PGm1-PGmn).

[0098] For example, assume that in each pixel group (such as PG11-PG1n, PGm1-PGmn), the red LEDs R11, R12, R21, R22 are first lit, then the green LEDs G11, G12, G21, G22 are lit, and finally the blue LEDs B11, B12, B21, B22 are lit. At this time, the current data CNT1 determines the current level of driving the red LEDs R11, R12, R21, R22, the current data CNT2 drives the current level of the green LEDs G11, G12, G21, G22, and the current data CNT3 determines the current level of driving the blue LEDs B11, B12, B21, B22.

[0099] The working fields Duty11, Duty21, Duty31, and Duty41 respectively determine the current pulse widths of the red light-emitting diodes R11, R12, R21, and R22; the working fields Duty12, Duty22, Duty32, and Duty42 respectively determine the current pulse widths of the green light-emitting diodes G11, G12, G21, and G22; and the working fields Duty13, Duty23, Duty33, and Duty43 respectively determine the current pulse widths of the blue light-emitting diodes B11, B12, B21, and B22.

[0100] Figure 6 FIG. 1 is a circuit diagram of a display driving circuit of a display device according to an embodiment of the present invention. Figure 1 , Figure 5 and Figure 6 , each display driving circuit (such as 120_11~120_1n, 120_m1~120_mn) can be taken as an example of the display driving circuit 200, but the embodiment of the present invention is not limited thereto. In this embodiment, the display driving circuit 200 receives an input voltage Vin and a reset signal Reset, and includes a frequency converter 210, a token transmission circuit 220, a data receiving circuit 230, a driving control circuit 240, a driving multiplexing circuit 250, a duty cycle switch circuit 260 and a current sink circuit 270.

[0101] The frequency converter 210 receives the clock signal CLK to provide the internal clock signal CLKi. The token transmission circuit 220 receives the timing token Token and the internal clock signal CLKi to start each display driving circuit 200 to perform data update, and outputs the timing token Token when the data update is completed. The data receiving circuit 230 receives the display data Vdata (i.e., the corresponding one of the display data Vdata_1 to Vdata_n) and the internal clock signal CLKi to capture the display data Vdata based on the internal clock signal CLKi. Then, the data receiving circuit 230 provides the sequence data SE and the current data CNT1 to CNT3 based on the header field Header of the captured display data Vdata, and provides the duty cycle data XDuty based on the duty fields Duty11 to Duty13, Duty21 to Duty23, Duty31 to Duty33, and Duty41 to Duty43 of the captured display data Vdata.

[0102] The driving multiplexing circuit 250 is coupled to the cathodes of the red light emitting diodes R11, R12, R21, R22, the green light emitting diodes G11, G12, G21, G22, and the blue light emitting diodes B11, B12, B21, B22 of a corresponding one of the pixel groups (e.g., PG11-PG1n, PGm1-PGmn). The duty cycle switch circuit 260 is coupled to the driving multiplexing circuit 250, and the current sink circuit 270 is coupled between the duty cycle switch circuit 260 and the ground voltage GND. The driving control circuit 240 receives the clock signal CLK, and is coupled to the data receiving circuit 230, the driving multiplexing circuit 250, the duty cycle switch circuit 260, and the current sink circuit 270.

[0103] The driving control circuit 240 controls the driving multiplexing circuit 250 based on the sequential data SE to connect the red light-emitting diodes R11, R12, R21, R22, the green light-emitting diodes G11, G12, G21, G22, or the blue light-emitting diodes B11, B12, B21, B22 of a corresponding one of the pixel groups (PG11~PG1n, PGm1~PGmn) to the duty cycle switching circuit 260. Furthermore, the driving control circuit 240 controls the duty cycle switch circuit 260 based on the duty cycle data XDuty to determine the duty cycle of each of the red LEDs R11, R12, R21, R22, the green LEDs G11, G12, G21, G22, and the blue LEDs B11, B12, B21, B22 of a corresponding one of the pixel groups (e.g., PG11-PG1n, PGm1-PGmn), that is, to determine the current pulse width for lighting up the red LEDs R11, R12, R21, R22, lighting up the green LEDs G11, G12, G21, G22, and lighting up the blue LEDs B11, B12, B21, B22. However, the driving control circuit 240 controls the current sink circuit 270 based on the current data CNT1-CNT3 to determine the first current level (e.g., Figure 2E LV1), driving the second current level of the green light emitting diodes G11, G12, G21, G22 (such as Figure 2E LV2), and a third current level (as shown in FIG. 1 ) for driving the blue light emitting diodes B11, B12, B21, and B22. Figure 2E LV3 shown).

[0104] For example, assuming that the sequence data SE indicates that the green LEDs G11, G12, G21, and G22 are lit first, the driving control circuit 240 first connects the green LEDs G11, G12, G21, and G22 to the duty cycle switch circuit 260 based on the sequence data SE, determines the duty cycles of the green LEDs G11, G12, G21, and G22 based on the duty fields Duty11, Duty21, Duty31, and Duty41, and determines the current levels of the green LEDs G11, G12, G21, and G22 based on the current data CNT1; then, the driving control circuit 240 connects the blue LEDs B11, B12, B21, and B22 to the duty cycle switch circuit 260 based on the sequence data SE, and determines the current levels of the green LEDs G11, G12, G21, and G22 based on the duty fields Duty11, Duty21, Duty31, and Duty41. The fields Duty12, Duty22, Duty32, and Duty42 respectively determine the duty cycles of the blue light emitting diodes B11, B12, B21, and B2, and determine the current levels of driving the blue light emitting diodes B11, B12, B21, and B2 based on the current data CNT2. Then, the driving control circuit 240 connects the red light emitting diodes R11, R12, R21, and R22 to the duty cycle switch circuit 260 based on the sequence data SE, and respectively determines the duty cycles of the red light emitting diodes R11, R12, R21, and R22 based on the duty fields Duty13, Duty23, Duty33, and Duty43, and determines the current levels of driving the red light emitting diodes R11, R12, R21, and R22 based on the current data CNT3. In this way, a data update of the display driving circuit 200 and the corresponding pixel groups (such as PG11-PG1n, PGm1-PGmn) is completed.

[0105] In the present embodiment, the driving control circuit 240 includes a first register REG1, a second register REG2, a third register REG3, a sequence selector 241, a duty cycle counter 242, and a current level selector 243. The first register REG1 stores sequence data SE. The sequence selector 241 is coupled to the first register REG1 and the driving multiplexer circuit 250 to control the driving multiplexer circuit 250 based on the sequence data SE. The second register REG2 stores duty cycle data XDuty. The duty cycle counter 242 is coupled to the second register REG and the duty cycle switch circuit 260 to control the duty cycle switch circuit 260 based on the duty cycle data XDuty. The third register REG3 stores current data CNT1-CNT3. The current level selector 243 is coupled to the third register and the current sink circuit 270 to control the current sink circuit 270 based on the current data CNT1-CNT3.

[0106] Figure 7FIG. 1 is a circuit diagram of a current sink circuit of a display driving circuit of a display device according to an embodiment of the present invention. Figure 1 , Figure 5 , Figure 6 and Figure 7 The current sink circuit 270 can be exemplified by the current sink circuit 271. In this embodiment, the current sink circuit 271 includes a first current source CS0, a second current source CS1, a third current source CS2, a first current switch SW0, a second current switch SW1, and a third current switch SW2.

[0107] The first current source CS0 provides a first current I0, the second current source CS1 provides a second current I1, and the third current source CS2 provides a third current I2, wherein the magnitude of the first current I0, the magnitude of the second current I1, and the magnitude of the third current I2 are different from each other. The first current switch SW0 is coupled between the duty cycle switch circuit 260 and the first current source CS0, the second current switch SW1 is coupled between the duty cycle switch circuit 260 and the second current source CS1, and the third current switch SW2 is coupled between the duty cycle switch circuit 260 and the third current source CS2.

[0108] In the present embodiment, one or more of the first current switch SW0, the second current switch SW1 and the third current switch SW2 are controlled by the driving control circuit 240 to be turned on to determine the current Isub of the duty cycle switching circuit 260, that is, to determine the current level of the driving light-emitting diodes R11, R12, R21, R22, the green light-emitting diodes G11, G12, G21, G22, or the blue light-emitting diodes B11, B12, B21, B22.

[0109] Further, the first current switch SW0 can be controlled by bit A4 of the current data CNT1, bit A7 of the current data CNT2, or bit A10 of the current data CNT3 to connect the duty cycle switch circuit 260 or the reference voltage Vref to the first current source CS0; the second current switch SW1 can be controlled by bit A3 of the current data CNT1, bit A6 of the current data CNT2, or bit A9 of the current data CNT3 to connect the duty cycle switch circuit 260 or the reference voltage Vref to the second current source CS1; and the third current switch SW2 can be controlled by bit A2 of the current data CNT1, bit A5 of the current data CNT2, or bit A8 of the current data CNT3 to connect the duty cycle switch circuit 260 or the reference voltage Vref to the third current source CS2, but the embodiments of the present invention are not limited to this.

[0110] In this embodiment, the magnitude of the first current I0, the magnitude of the second current I1, and the magnitude of the third current I2 are in a geometric progression. For example, the magnitude of the second current I1 may be twice the magnitude of the first current I0, and the third current I2 may be twice the magnitude of the second current I1 (i.e., four times the magnitude of the first current I0).

[0111] In summary, in the display device of the embodiment of the present invention, during a lighting period, among all pixel groups, some light up the red LEDs, some light up the green LEDs, and some light up the blue LEDs, so that in different but adjacent pixel groups, the lighting order of the red LEDs, green LEDs, and blue LEDs is staggered, thereby improving the brightness of different positions of the display panel on the time axis. The stability can reduce the visual fatigue caused by viewing the user.

[0112] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some 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 device, characterized in that: include: A plurality of pixel circuits are arranged in an array and divided into a plurality of pixel groups, and each of the pixel circuits has a first color light emitting diode, a second color light emitting diode, and a third color light emitting diode; A timing controller for providing a plurality of display data; as well as A plurality of display driving circuits are arranged in an array and are respectively coupled to the timing controller and a corresponding one of the pixel groups, so as to drive the pixel circuits in the corresponding pixel group to sequentially light up the first color light emitting diode, the second color light emitting diode, and one of the third color light emitting diodes during a plurality of lighting periods based on a corresponding one of the display data, During each of the lighting periods, the pixel groups alternately light up a portion of the first color LEDs, a portion of the second color LEDs, and a portion of the third color LEDs.

2. The display device according to claim 1, wherein: The first color LEDs, the second color LEDs, or the third color LEDs lit by each of the pixel groups during each of the lighting periods are the same as the first color LEDs, the second color LEDs, or the third color LEDs lit by a horizontally adjacent pixel group.

3. The display device according to claim 1, wherein: The first color LEDs, the second color LEDs, or the third color LEDs lit by each of the pixel groups during each of the lighting periods are the same as the first color LEDs, the second color LEDs, or the third color LEDs lit by a vertically adjacent pixel group.

4. The display device according to claim 1, wherein: The first color LEDs, the second color LEDs, or the third color LEDs lit by each of the pixel groups during each of the lighting periods are the same as the first color LEDs, the second color LEDs, or the third color LEDs lit by an obliquely adjacent pixel group.

5. The display device according to claim 1, wherein: The timing controller is further used to provide a timing mark and a clock signal, wherein the timing mark is transmitted row by row through the display driving circuits to activate the display driving circuits row by row.

6. The display device according to claim 5, characterized in that Each of the display data includes a header field and a plurality of working fields, wherein the header field determines the first color LEDs, the second color LEDs, or the third color LEDs lit by each of the pixel groups during each of the lighting periods and determines the current level for lighting the first color LEDs, the second color LEDs, and the third color LEDs, and the working fields respectively determine the current pulse width for lighting the first color LEDs, the second color LEDs, and the third color LEDs in the pixel circuits of each of the pixel groups.

7. The display device according to claim 6, wherein: Each of the display driving circuits includes: a frequency converter, receiving the clock signal to provide an internal clock signal; A token transmission circuit receives the timing token and the internal clock signal to activate each of the display driving circuits, and outputs the timing token; a data receiving circuit receiving a corresponding one of the display data and the internal clock signal to provide a sequence data and a current data based on the header field of the corresponding one of the display data, and to provide a duty cycle data based on the duty fields of the corresponding one of the display data; a driving multiplexing circuit coupled to the first-color LEDs, the second-color LEDs, and the third-color LEDs of a corresponding one of the pixel groups; A duty cycle switch circuit coupled to the driving multiplexing circuit; a current sink circuit coupled to the duty cycle switch circuit; and a driving control circuit, receiving the clock signal and coupled to the data receiving circuit, the driving multiplexing circuit, the duty cycle switch circuit, and the current sink circuit; wherein the driving control circuit controls the driving multiplexing circuit based on the sequence data to connect the first color light emitting diodes, the second color light emitting diodes, or the third color light emitting diodes of a corresponding one of the pixel groups to the duty cycle switching circuit, wherein the driving control circuit controls the duty cycle switch circuit based on the duty cycle data to determine a duty cycle of each of the first color light emitting diodes, the second color light emitting diodes, and the third color light emitting diodes corresponding to one of the pixel groups, and The driving control circuit controls the current sink circuit based on the current data to determine a first current level for driving the first color LEDs, a second current level for driving the second color LEDs, and a third current level for driving the third color LEDs.

8. The display device according to claim 7, characterized in that: The drive control circuit includes: a first register storing the sequence data; a sequence selector coupled to the first register and the driving multiplex circuit to control the driving multiplex circuit based on the sequence data; A second register for storing the duty cycle data; a duty cycle counter coupled to the second register and the duty cycle switch circuit to control the duty cycle switch circuit based on the duty cycle data; a third register for storing the current data; and A current level selector is coupled to the third register and the current sink circuit to control the current sink circuit based on the current data.

9. The display device according to claim 7, wherein: The current sink circuit comprises: a first current source, providing a first current; a first current switch coupled between the duty cycle switch circuit and the first current source; a second current source, providing a second current; a second current switch coupled between the duty cycle switch circuit and the second current source; a third current source, providing a third current; and a third current switch coupled between the duty cycle switch circuit and the third current source, One or more of the first current switch, the second current switch and the third current switch are controlled by the driving control circuit to be turned on, and the magnitudes of the first current, the second current and the third current are different from each other.

10. The display device according to claim 9, characterized in that The magnitude of the first current, the magnitude of the second current and the magnitude of the third current are in relationship.

11. The display device according to claim 1, wherein: The first color LEDs, the second color LEDs, and the third color LEDs include a plurality of red LEDs, a plurality of green LEDs, and a plurality of blue LEDs.

Images