Display driving system and display driving method

Abstract

A display driving system is used for controlling a scanning action of a display, and comprises a scanning control circuit used for receiving a scanning starting position signal and generating a switch selection signal according to the scanning starting position signal; the scanning switching circuit is coupled with the display and the scanning control circuit, comprises a plurality of switches and is used for starting one of the switches according to the switch selection signal so as to control the display to start the scanning action at a scanning starting position; wherein the display comprises N scanning lines, and the scanning starting position is one of the scanning lines. The invention also relates to a display driving method.

Description

Technical Field

[0001] The invention relates to a display driving system and a display driving method, and more particularly to a display driving system and a display driving method capable of selectively performing a dynamic scan. Background Art

[0002] Traditional displays scan all scan lines each time they refresh the screen. However, the image data of some scan lines may not need to be refreshed. Therefore, this scanning mechanism increases the required frame refresh time and wastes power. Therefore, a new display scanning mechanism is needed. Summary of the invention

[0003] An object of the present invention is to provide a display driving system capable of performing dynamic scanning.

[0004] Another object of the present invention is to provide a display driving method capable of performing dynamic scanning.

[0005] An embodiment of the present invention provides a display driving system for controlling a scanning action of a display, comprising: a scanning control circuit for receiving a scanning starting position signal and for generating a switch selection signal according to the scanning starting position signal; a scanning switching circuit, coupling the display and the scanning control circuit, and comprising a plurality of switches for activating one of the switches according to the switch selection signal to control the display to start the scanning action at a scanning starting position; wherein the display comprises N scanning lines, wherein the scanning starting position is one of the scanning lines.

[0006] Another embodiment of the present invention provides a display driving method for controlling a scanning action of a display, comprising: generating a switch selection signal by a scanning control circuit according to a scanning starting position signal; activating one of a plurality of switches between the display and the scanning control circuit according to the switch selection signal to control the display to start the scanning action at a scanning starting position; wherein the display comprises N scanning lines, wherein the scanning starting position is one of the scanning lines.

[0007] According to the aforementioned embodiments, dynamic scanning of the display can be selectively performed without being limited to scanning all pixel columns, thereby reducing power consumption and scanning time. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A block diagram of a display driving system according to an embodiment of the present invention is shown.

[0009] Figure 2 According to an embodiment of the present invention, Figure 1A schematic diagram of the dynamic scanning performed by the display driving system shown.

[0010] Figure 3 According to an embodiment of the present invention, Figure 1 A schematic diagram showing detailed contents of signals of a display driving system is shown.

[0011] Figure 4 According to an embodiment of the present invention, Figure 3 Schematic diagram of the detailed structure of the scan switching circuit shown.

[0012] Figure 5 According to an embodiment of the present invention, Figure 3 and Figure 4 Schematic diagram of the truth table of the signal shown.

[0013] Figure 6 According to an embodiment of the present invention, Figure 3 and Figure 4 The waveform of the signal is shown.

[0014] Figure 7 FIG. 4 is a block diagram of a display driving system according to another embodiment of the present invention.

[0015] Figure 8 According to an embodiment of the present invention, Figure 7 A schematic diagram of the dynamic scanning performed by the display driving system shown.

[0016] Fig. 9 According to an embodiment of the present invention, Figure 7 A schematic diagram showing detailed contents of signals of a display driving system is shown.

[0017] Fig.10 According to an embodiment of the present invention, Fig. 9 Schematic diagram of the truth table of the signal shown.

[0018] Fig.11 According to an embodiment of the present invention, Fig. 9 The waveform of the signal is shown.

[0019] Fig.12 A flow chart of a display driving method according to an embodiment of the present invention is shown.

[0020] The reference numerals are described as follows:

[0021] 100, 700, 700_1, 700_2: Display drive system

[0022] 101: Scanning control circuit

[0023] 103: Scan switching circuit

[0024] DS: Display

[0025] SC, SC_1, SC_2, SC_3: Scanning circuit

[0026] De_U, De_D: Decoder

[0027] SW_11-SW_14, SW_21-SW_24, SW_b1, SW_b2: switch

[0028] 701: Overlap mode control circuit DETAILED DESCRIPTION

[0029] The present invention will be described below with multiple embodiments. Please note that the "first", "second" and similar descriptions in the following description are only used to define different elements, parameters, data, signals or steps. They are not used to limit their order. For example, the first device and the second device can be different devices with the same structure.

[0030] Figure 1 FIG. 1 is a block diagram of a display driving system according to an embodiment of the present invention. Figure 1 As shown, the display driving system 100 is used to control the scanning action of the display DS, and includes a scanning control circuit 101 and a scanning switching circuit 103. The scanning display DS can be any type of display, for example, an LCD, an OLED display or an EPD (Electro-Phoretic Display). Figure 1 In the embodiment of the present invention, the scan control circuit 101 receives the start position signal POS and generates a switch selection signal POS_CH according to the scan start position signal POS. The scan switching circuit 103 is coupled to the display DS and the scan control circuit 101 and includes a plurality of switches. The scan switching circuit 103 activates one of the switches according to the switch selection signal POS_CH to control the display DS to start scanning at the scan start position.

[0031] More specifically, in one embodiment, the scan control circuit 101 receives the scan trigger signal STV and performs a scan action corresponding to a specific logic value (e.g., a high logic value) of the scan trigger signal STV. By activating a corresponding switch, the scan trigger signal STV corresponding to different starting positions can be selectively transmitted to the scan circuit SC. The scan circuit SC can be disposed in the display DS or integrated in the display driving system 100.

[0032] In one embodiment, the display DS comprises N scan lines (pixel rows in the following examples). The scan start position is one of the scan lines. In other words, the present invention provides a dynamic scan, wherein the scan start position can be any scan line, rather than being limited to the start scan line or the final scan line in the conventional scan action.

[0033] Figure 2 According to an embodiment of the present invention, Figure 1 Schematic diagram of the dynamic scanning performed by the display driving system shown in FIG. Figure 2 As shown in FIG. 1 , the scanning line of the display DS can be divided into three intervals (i.e., three parts), including interval 0, interval 1, and interval 2. The scanning start position can be the first scanning line, the second scanning line, and the third scanning line. Scan line and If the scanning start position is the first scanning line, the scanning action is from the first scanning line to the Nth scanning line. According to the same rule, the scanning action can be from the scan line to the Nth scan line, or from the The first scan line to the Nth scan line.

[0034] In one embodiment, the scanning action can be two types of scanning: forward scanning or reverse scanning. In the forward scanning, the scanning starting position can be the first scanning line, the second scanning line, the third scanning line, the fourth scanning line, the fifth ... Scan line and In the reverse scan, the scan start position can be one of the Nth scan lines, Scan line and If the scanning start position is the Nth scanning line, the scanning action is from the Nth scanning line to the first scanning line. According to the same rule, the scanning action can be from the Nth scanning line to the first scanning line. scan line to the first scan line, or from the scan line to the first scan line.

[0035] The present invention is not limited to Figure 2 Embodiment. The scan lines of the display DS can be divided into different parts other than the three intervals, and the scan start positions can be set corresponding to these parts. Therefore, the scan start position of the present invention can be the Xth scan line, and X is 1, N, or between 2 and N-1. In other words, the scanning action of the present invention is not limited to starting from the first scan line (starting scan line) or the Nth scan line (last scan line). In addition, the scanning direction of the scanning action can be from the Xth scan line to the Nth scan line (forward scanning) or from the Xth scan line to the first scan line (reverse scanning).

[0036] Figure 3 According to an embodiment of the present invention, Figure 1 Detailed description of the signal of the display driving system is shown in FIG. Figure 3 In the embodiment of the present invention, the scanning start position signal POS[1:0] is a two-bit digital signal, and the switch selection signal POS_CH[1:0] is also a two-bit digital signal. Figure 3 In the embodiment of the present invention, the scan control circuit 101 also receives the above-mentioned scan trigger signal STV and the scan reset signal GDRST. The dynamic scan is triggered by the first logic value (e.g., low logic value) of the scan trigger signal STV and the second logic value (e.g., low logic value) of the scan reset signal GDRST. In addition, the scan control circuit 101 can also send a scan enable signal SCAN_EN, and the scan enable signal SCAN_EN can start or stop the dynamic scan action. In addition, in Figure 3 In the embodiment of the present invention, the scan switching circuit 103 receives signals STV_1, STV_2 and signals U and D. Signals STV_1, STV_2 have the same value as signal STV. Signal U is used to trigger the above-mentioned forward scan action, and signal D is used to trigger the above-mentioned reverse scan action.

[0037] Figure 4 According to an embodiment of the present invention, Figure 3 FIG. 1 is a schematic diagram of a detailed structure of the scan switching circuit 103 shown in FIG. Figure 5 According to an embodiment of the present invention, Figure 3 and Figure 4 A schematic diagram of the truth table of the signal is shown in Figure 5 At the same time reference Figure 3 and Figure 4 , in order to more clearly understand the concept of the present invention.

[0038] Figure 5 It includes two tables: Table A and Table B. Table A shows the relationship between dynamic scanning and scan enable signal SCAN_EN. If the scan enable signal SCAN_EN=1, it means that the frame is dynamically scanned. On the contrary, if the signal SCAN_EN=0, it means that the frame is normally scanned. Therefore, Figure 5 In the example of , dynamic scanning is performed on the first frame, and normal scanning is performed on the second frame. Figure 3 and Figure 4 The signal shown.

[0039] like Figure 4As shown, the scan switching circuit 103 includes decoders De_U and De_D and switches SW_11-SW_14, SW_21-SW_24. The decoder De_U and the switches SW_11-SW_14 are used to perform the above-mentioned forward scanning action, while the decoder De_D and the switches SW_21-SW_24 are used to perform the above-mentioned reverse scanning action. However, the scan switching circuit 103 may include only one set of decoders and switches. For example, the scan switching circuit 103 may include only the decoder De_U and the switches SW_11-SW_14, or only the decoder De_D and the switches SW_21-SW_24.

[0040] Decoder De_U is used to receive switch selection signal POS_CH[1:0] to generate switch selection code POSOUTU[0]-POSOUTU[3]. The relationship between the value of switch selection signal POS_CH[1:0] and switch selection code POSOUTU[0]-POSOUTU[3] can be set according to different requirements. Switches SW_11-SW_14 are selectively activated (conducted) corresponding to switch selection code POSOUTU[0]-POSOUTU[3]. Figure 5 As shown, if the signal U is 1 and D is 0, forward scanning is performed instead of reverse scanning. At this time, the switch selection codes POSOUTD[0]-POSOUTD[3] are all 0, so the switches SW_21-SW_24 are all closed (not conducting).

[0041] Figure 4 The switch selection codes POSOUTU[0]-POSOUTU[3] shown correspond to Figure 5 In detail, switch selection code POSOUTU[3] corresponds to switch selection code POSOUTU[3:3], and switch selection codes POSOUTU[3] and POSOUTU[2] correspond to switch selection code POSOUTU[3:2]. Switch selection codes POSOUTU[3], POSOUTU[2], and POSOUTU[1] correspond to control code POSOUTU[3:1], and switch selection codes POSOUTU[3], POSOUTU[2], POSOUTU[1], and POSOUTU[0] correspond to control code POSOUTU[3:0]. Therefore, if switch selection code POSOUTU[3:0] is ABCD, switch selection code POSOUTU[3:1] is ABC, switch selection code POSOUTU[3:2] is AB, and switch selection code POSOUTU[3:3] is A. Therefore, the switch selection code POSOUTU[3] is A, the switch selection code POSOUTU[2] is B, the switch selection code POSOUTU[1] is C, and the switch selection code POSOUTU[0] is D.

[0042] In one embodiment, when the scan enable signal SCAN_EN=1, the scan start position signal POS[1:0] and the switch selection signal POS_CH[1:0] have the same value. Therefore, if the scan start position signal POS[1:0] is 00, the switch selection code POSOUTU[3]-POSOUTU[0] is 0001, so that switches SW_12, SW_13, and SW_14 are closed, and only switch SW_11 is activated. Therefore, the scan start position is the first scan line. If the scan start position signal POS[1:0] is 01, the switch selection code POSOUTU[3]-POSOUTU[0] is 0010, then switches SW_11, SW_13, and SW_14 are closed, and only switch SW_12 is activated. Therefore, the scan start position is the first scan line. If the scan start position signal POS[0:1] is 10, the switch selection code POSOUTU[3]-POSOUTU[0] is 0100, switches SW_11, SW_12, and SW_14 are closed, and only switch SW_13 is enabled. Therefore, the scan start position is the If the scan start position signal POS[0:1] is 11, the switch selection code POSOUTU[3]-POSOUTU[0] is 1000, so switches SW_11, SW_12, and SW_13 are closed, and only switch SW_14 is enabled. In this case, dynamic scanning is not performed, but the conventional normal operation (i.e., scanning all scan lines) is performed. The operation of the decoder De_D is similar to that of switches SW_21 to SW_24, such as Figure 5 As shown, I will not repeat it here.

[0043] Figure 6 According to an embodiment of the present invention, Figure 3 and Figure 4 The waveform of the signal is shown in Figure 6 In the clock signal GCLK is Figure 1 The clock signal used by the scanning circuit SC. The signals STV and GDRST are the above-mentioned scanning trigger signal STV and scanning reset signal GDRST. Figure 6 As shown in FIG. 1 , the scanning action is triggered by the low logic value of the scanning trigger signal STV and the scanning reset signal GDRST. If the scanning start position signal POS[1:0] is 00, the scanning start position is the first scanning line, thereby scanning N scanning lines (N channels). In addition, if the scanning start position signal POS[1:0] is 01, the scanning start position is the scan lines, so In addition, if the scanning start position signal POS[1:0] is 10, the scanning start position is Scan lines, and then scan Scan line.

[0044] In the aforementioned embodiment, the scanning action of the entire frame (i.e., all the scanning lines of the display DS) is controlled by a single scanning circuit. However, in another embodiment, the scanning action of the entire frame is controlled by multiple scanning circuits. For example, if the display DS has a high resolution, the speed of a single scanning circuit is not enough to scan the entire frame within the required time, so multiple scanning circuits are required. This mode is called a cascade mode.

[0045] Figure 7 FIG. 7 is a block diagram of a display driving system 700 according to another embodiment of the present invention. Figure 7 As shown, the display driving system 700 includes an overlapping mode control circuit 701 in addition to the above-mentioned scanning control circuit 101 and scanning switching circuit 103. Figure 7 In the embodiment of the present invention, a plurality of scanning circuits (in this example, three scanning circuits SC_1, SC_2 and SC_3) are included. Each of the scanning circuits SC_1, SC_2 and SC_3 (first scanning circuit, second scanning circuit and third scanning circuit) controls the scanning action of the corresponding part of the scanning line of the display DS. The scanning circuits SC_1, SC_2 and SC_3 can be different ICs (Integration Circuits) and can be set in the display DS or integrated into the display driving system 700. In addition, in Figure 7 In the embodiment of the present invention, each scanning circuit SC_1, SC_2 and SC_3 corresponds to one of the single display driving systems 700, 700_1 and 700_2. The following description only takes the display driving system 700 as an example. However, the actions of the display driving systems 700_1 and 700_2 may have the same actions as the display driving system 700. Please note that in this case, different display driving systems may be regarded as a single display driving system.

[0046] Figure 7 The scan control circuit 101 receives the start position signal POS and generates a switch selection signal POS_CH according to the scan start position signal POS. Figure 7The scan control circuit 101 in the embodiment further receives the dynamic enable signal Dyn_en generated by the overlay mode control circuit 701, and receives the above-mentioned scan trigger signal STV. The overlay mode control circuit 701 receives the reference signal POS' and the overlay control signal CS. The scan circuits SC_1, SC_2 and SC_3 respectively perform one of the following actions according to the value of the reference signal POS', the value of the switch selection signal POS_CH and the relationship between the reference signal POS' and the overlay control signal CS: scan all corresponding parts (i.e. normal scan), scan only a part of the corresponding parts (i.e. dynamic scan), and do not perform any scan action (i.e. bypass). The details of these actions will be described in the following description.

[0047] Figure 8 According to an embodiment of the present invention, Figure 7 Schematic diagram of dynamic scanning performed by the display driving system shown in FIG. As described above, each of the scanning circuits SC_1, SC_2 and SC_3 controls the scanning action of the corresponding part of the display DS. Figure 8 In the embodiment of FIG. 1 , the display DS further comprises N scanning lines. Figure 8 In the embodiment, each of the scanning circuits SC_1, SC_2 and SC_3 controls the scanning action of a portion of a frame (i.e., a portion of the N scanning lines of the display DS). This portion of the frame is the corresponding portion described above, and includes three intervals INV2, INV1 and INV0. Figures 1 to 5 In the embodiment of , only the scanning starting position needs to be selected. Figure 8 In the embodiment, in addition to scanning the start position, it is also necessary to select one of the scanning circuits SC_1, SC_2 and SC_3 to perform dynamic scanning.

[0048] In one embodiment, the scanning circuit SC_3 is after the scanning circuit SC_2, and the scanning circuit SC_2 is after the scanning circuit SC_1. In other words, the corresponding part of the scanning circuit SC_3 is after the corresponding part of the scanning circuit SC_2, and the corresponding part of the scanning circuit SC_2 is after the corresponding part of the scanning circuit SC_1. For example, the corresponding part of the scanning circuit SC_1 is the 1st to Xth scanning lines of the display DS, the corresponding part of the scanning circuit SC_2 is the (X+1)th to Yth scanning lines of the display DS, and the corresponding part of the scanning circuit SC_2 is the (X+1)th to Yth scanning lines of the display DS. The corresponding part of the scanning circuit SC_3 is the (Y+1)th to Nth scanning lines of the display DS.

[0049] In this embodiment, if one of the scanning circuits SC_1 and SC_3 does not perform a scanning action (i.e., bypassed), the other scanning circuit scans all corresponding parts (i.e., normal scanning). In addition, in this embodiment, the scanning circuit SC_2 only scans part of the corresponding part (i.e., dynamic scanning). For example, the scanning circuit SC_1 is bypassed, the scanning circuit SC_2 performs dynamic scanning, and the scanning circuit SC_3 performs normal scanning. This action can also be called the forward scanning mentioned above. For another example, the scanning circuit SC_3 is bypassed, the scanning circuit SC_2 performs dynamic scanning, and the scanning circuit SC_1 performs normal scanning. This action can also be called the backward scanning mentioned above. It should be understood that such an embodiment can be used for other applications. For example, if the corresponding part of the scanning circuit SC_1 is not the starting part of the display DS, when the scanning circuit SC_2 performs dynamic scanning, the scanning circuit followed by the scanning circuit SC_1 can also be bypassed. For another example, if the corresponding part of the scanning circuit SC_3 is not the last part of the display DS, when the scanning circuit SC_2 performs dynamic scanning, the scanning circuit after the scanning circuit SC_3 can also perform normal scanning.

[0050] Fig. 9 According to an embodiment of the present invention, Figure 7 A schematic diagram showing detailed contents of signals of a display driving system is shown. Fig.10 According to an embodiment of the present invention, Fig. 9 Please also refer to the schematic diagram of the truth table of the signal shown. Figure 7 , Figure 8 , while referring to Fig. 9 and Fig.10 , in order to more clearly understand the concept of the present invention.

[0051] exist Fig. 9 In the embodiment of the present invention, the splicing control signal CS[1:0] is a two-bit digital signal, and the reference signal POS[3:2] is also a two-bit digital signal. As described above, the scanning start position signal POS[1:0] received by the scanning control circuit 101 is also a two-bit digital signal. Therefore, in this case, the scanning start position signal POS[1:0] is a digital signal of the first part of the specific digital signal POS[3:0], and the reference signal POS[3:2] is a digital signal of the second part of the specific digital signal POS[3:0]. The first part is used to select the scanning circuit used for dynamic scanning, and the second part is used to set the scanning start position of the scanning circuit selected by the first part.

[0052] The scan reset signal GDRST, the scan trigger signal STV, the start position signal POS[1:0] received by the scan control circuit 101, the switch selection signal POS_CH[1:0] output by the scan control circuit 101, and the scan trigger signals STV_1, STV_2, and the signals U and D received by the scan switching circuit 103 have been described in detail in the above embodiments, and will not be repeated here.

[0053] As described above, the scanning circuits SC_1, SC_2 and SC_3 operate according to the switch selection signal POS_CH and the relationship between the reference signal POS' and the overlapping control signal CS. In one embodiment, the relationship is the relationship between the values ​​of the reference signal POS' and the overlapping control signal CS. Fig. 9 In an embodiment, the display driving system 700 includes a bypass circuit, and the bypass circuit includes a switch SW_b1 and a switch SW_b2. The switch SW_b1 is controlled by the inverted signal of the bypass signal byp, and the switch SW_b2 is controlled by the bypass signal byp. The bypass circuit is used to block the scan trigger signal STV from being transmitted to the scan circuit to be bypassed, and is used to transmit the scan trigger signal to the next scan circuit of the scan circuit to be bypassed (that is, the circuit that should perform dynamic scanning). In one embodiment, if the scan trigger signal STV_IN is not bypassed by the bypass circuit, the scan trigger signal STV_IN is transmitted to the scan switching circuit 103 via the switch SW_b1 as the scan trigger signal STV1, STV2 or STV. On the contrary, if the scan trigger signal STV_IN is bypassed by the bypass circuit, the scan trigger signal STV_IN will be transmitted to the next scan circuit via the switch SW_b2 as the signal STV_O.

[0054] like Fig.10As shown, for the forward scan (U=1, D=0), if the value of the reference signal POS[3:2] is less than the overlap control signal CS[1:0], the dynamic enable signal Dyn_en is 0, and the bypass signal byp is 0. In addition, if the above-mentioned scan enable signal Scan_en is 0, the dynamic enable signal Dyn_en is 0, and the bypass signal byp is 0. At this time, dynamic scanning is not performed, and the corresponding scan circuit is not bypassed, and can receive the scan trigger signal STV_IN to perform normal scanning. In addition, if the value of the reference signal POS[3:2] is the same as the value of the overlap control signal CS[1:0], the dynamic enable signal Dyn_en is 1 and the bypass signal byp is 0. In this case, dynamic scanning is performed, that is, the corresponding scan circuit receives the scan trigger signal STV_IN to perform dynamic scanning. Furthermore, if the value of the reference signal POS[3:2] is greater than the value of the overlay control signal CS[1:0], the dynamic enable signal Dyn_en is 0 and the bypass signal byp is 1, so dynamic scanning is not performed and the corresponding bypassed scanning circuit does not receive the scanning trigger signal STV_IN.

[0055] Fig.10 An example of a truth table when U / D is 10 is shown below:

[0056] For the scan circuit SC_1, the overlap control signal CS[1:0] is 00, and the specific digital signal POS[3:0] is 0101, so the value of POS[3:2] (01) is greater than the value of the overlap control signal CS[1:0], and the scan circuit SC_1 is bypassed. For the scan circuit SC_2, the overlap control signal CS[1:0] is 01, and the specific digital signal POS[3:0] is 0101, so the value of POS[3:2] (01) is the same as the value of the overlap control signal CS[1:0], and the scan circuit SC_2 performs dynamic scanning. For the scan circuit SC_3, the overlap control signal CS[1:0] is 10, and the specific digital signal POS[3:0] is 0101, so the value of POS[3:2] (01) is less than the value of the overlap control signal CS[1:0], and the scan circuit SC_3 performs normal scanning.

[0057] According to the aforementioned embodiment, if the reference signal is a fixed value, such as a specific digital signal POS[3:0], the scan circuit can be controlled to be bypassed, perform dynamic scanning or perform normal scanning by setting the overlay control signal CS.

[0058] For reverse scanning (U / D=01), the operation sequence of the scanning circuit is reversed, so the rule is opposite to that of the forward scanning. More specifically, in the reverse scanning, the scanning circuit SC_3 is bypassed, the scanning circuit SC_2 performs dynamic scanning, and the scanning circuit SC_1 performs normal scanning. Therefore, in the reverse scanning, if the value of the reference signal POS[3:2] is less than the value of the overlay control signal CS[1:0], the dynamic enable signal Dyn_en is 0, the bypass signal byp is 1, and the corresponding scanning circuit is bypassed. And, if the value of the reference signal POS[3:2] is the same as the value of the overlay control signal CS[1:0], the dynamic enable signal Dyn_en is 1, the bypass signal byp is 0, and the corresponding scanning circuit performs dynamic scanning. If the value of the reference signal POS[3:2] is greater than the value of the overlay control signal CS[1:0], the dynamic enable signal Dyn_en is 0, the bypass signal byp is 0, and the corresponding scanning circuit performs normal scanning.

[0059] After selecting one of the scanning circuits for dynamic scanning, you can Figures 1 to 6 The embodiment shown performs dynamic scanning and normal scanning, so it will not be described in detail here. Fig.10 In the truth table of , if the switch selection signal = POS_CH[1:0] is 11, the scan circuit can be bypassed or perform normal operation.

[0060] Fig.11 According to an embodiment of the present invention, Fig. 9 The waveform of the signal is shown in Fig.11 In the embodiment of FIG. 5 , the display DS has 3N scan lines, and therefore, the scan circuits SC_1 , SC_2 and SC_3 respectively control corresponding parts having the 1st scan line to the Nth scan line.

[0061] exist Fig.11 In the example, the clock signal GCLK is Figure 7 The clock signals used by the scanning circuits SC_1, SC_2, and SC_3 in FIG. 1 are the scanning trigger signal STV and the scanning reset signal GDRST. Fig.11 As shown, the scanning action is triggered by the low logic value of the scanning trigger signal STV and the scanning reset signal GDRST. And, as described above, the scanning circuit SC_1 is bypassed, so it does not receive the scanning trigger signal STV. In addition, the scanning circuit SC_2 performs dynamic scanning, so the scanning action of the scanning circuit SC_2 is triggered by the low logic value of the STV signal (STV signal STV_SC2) received by the scanning circuit SC_2. Fig.11 In the embodiment of the present invention, the scanning circuit SC_2 scans the first After that, the scanning circuit SC_2 performs normal scanning, so the scanning action of the scanning circuit SC_3 is triggered by the low logic value of the STV signal (STV signal STV_SC3) received by the scanning circuit SC_3 to scan N scanning lines. .

[0062] According to the above-described embodiments, a display driving method can be obtained. Fig.12 A flow chart of a display driving method according to an embodiment of the present invention is shown, comprising the following steps:

[0063] Step 1201

[0064] Scan control circuit (eg Figure 1 The scanning control circuit 101 in the scanning control circuit 101) is based on the scanning start position signal (for example Figure 1 STV in) generates a switch selection signal (e.g. Figure 1 POS_CH in .

[0065] Step 1203

[0066] According to the switch selection signal, the display (such as Figure 1 One of the switches between the display DS in the display and the scanning control circuit is used to control the display to start the scanning action at the scanning starting position.

[0067] The display includes N scan lines, wherein the scan start position is one of the scan lines.

[0068] Other detailed steps can be obtained by referring to the above embodiments and will not be described in detail here.

[0069] According to the aforementioned embodiments, dynamic scanning of the display can be selectively performed without being limited to scanning all pixel columns, thereby reducing power consumption and scanning time.

[0070] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the claims of the present invention should fall within the scope of the present invention.

Claims

1. A display driving system for controlling a scanning action of a display, comprising: A scanning control circuit, for receiving a scanning start position signal and for generating a switch selection signal according to the scanning start position signal; a scan switching circuit coupled to the display and the scan control circuit and comprising a plurality of switches for activating one of the switches according to the switch selection signal to control the display to start the scan action at a scan start position; The display includes N scan lines, and the scan start position is one of the scan lines. 2 . The display driving system as claimed in claim 1 , wherein the scanning start position is the Xth scanning line, and X is between 2 and N-1.

3. The display driving system as claimed in claim 1, wherein the scanning starting position is the Xth scanning line, and wherein the scanning direction of the scanning action is from the Xth scanning line to the Nth scanning line, or from the Xth scanning line to the starting scanning line.

4. The display driving system as claimed in claim 1, wherein the scan control circuit further receives a scan driving signal and a scan reset signal, wherein the scan action is triggered by a first logic value of the scan driving signal and a second logic value of the scan reset signal.

5. The display driving system according to claim 1, Further comprising a plurality of scanning circuits, wherein each of the scanning circuits controls the scanning action of a corresponding portion of the N scanning lines; The display driving system further comprises: At least one overlapping mode control circuit, for receiving at least one reference signal and at least one overlapping control signal; The scanning circuit further performs one of the following actions according to the scanning selection signal and a relationship between the reference signal and the overlay control signal: Scan all of the corresponding parts, scan only a part of the corresponding parts, and do not perform the scanning action.

6. The display driving system according to claim 5, The relationship is a relationship between a value of the reference signal and a value of the overlay control signal. 7 . The display driving system as claimed in claim 5 , wherein the scanning start position signal is a digital signal of a first part of a specific digital signal, and the reference signal is a digital signal of a second part of the specific digital signal.

8. The display driving system as claimed in claim 7, wherein the first part is used to select the scanning circuit used to scan only a portion of the corresponding portion, and the second part is used to set the scanning start position of the scanning circuit selected by the first part.

9. The display driving system as claimed in claim 5, wherein the scan control circuit further receives a scan trigger signal, wherein the scan circuit performs the scan action in response to the scan trigger signal, wherein the display driving system further comprises: At least one bypass circuit is used to block the scan trigger signal transmitted to the scan circuit that does not perform the scan action according to the relationship, and to transmit the scan trigger signal to the next scan circuit of the scan circuit that does not perform the scan action according to the relationship.

10. The display driving system according to claim 5, The scanning circuit includes a first scanning circuit, a second scanning circuit and a third scanning circuit; wherein the third scanning circuit is after the second scanning circuit, and the second scanning circuit is after the first scanning circuit; If one of the first scanning circuit and the third scanning circuit does not perform the scanning action, the other scanning circuit of the first scanning circuit and the third scanning circuit scans all the corresponding parts; The second scanning circuit only scans a portion of the corresponding portion.

11. A display driving method for controlling a scanning action of a display, comprising: A scanning control circuit generates a switch selection signal according to a scanning start position signal; activating one of the plurality of switches between the display and the scanning control circuit according to the switch selection signal to control the display to start the scanning action at a scanning starting position; The display includes N scan lines, and the scan start position is one of the scan lines. 12 . The display driving method as claimed in claim 11 , wherein the scanning start position is the Xth scanning line, and X is between 2 and N-1. 13 . The display driving method as claimed in claim 11 , wherein the scanning start position is the Xth scanning line, and wherein the scanning direction of the scanning action is from the Xth scanning line to the Nth scanning line, or from the Xth scanning line to the starting scanning line.

14. The display driving method according to claim 11, further comprising The scanning action is triggered according to a first logic value of a scanning driving signal and a second logic value of a scanning reset signal.

15. The display driving method according to claim 11, further comprising One of the following actions is performed according to a relationship between the scan selection signal and a reference signal and an overlay control signal: Scan all corresponding parts, scan only a part of the corresponding parts, and do not perform the scanning action; Each of the scan circuits controls the scan action of a corresponding portion of the N scan lines.

16. The display driving method according to claim 15, The relationship is a relationship between a value of the reference signal and a value of the overlay control signal. 17 . The display driving method as claimed in claim 15 , wherein the scanning start position signal is a digital signal of a first part of a specific digital signal, and the reference signal is a digital signal of a second part of the specific digital signal.

18. The display driving method as claimed in claim 17, wherein the first part is used to select the scanning circuit for scanning only a part of the corresponding part, and the second part is used to set the scanning start position of the scanning circuit selected by the first part.

19. The display driving method as claimed in claim 15, wherein the scanning circuit performs the scanning action in response to a scanning trigger signal, wherein the display driving method further comprises: The scan trigger signal transmitted to the scan circuit that does not perform the scan action according to the relationship is blocked, and the scan trigger signal is transmitted to a scan circuit next to the scan circuit that does not perform the scan action according to the relationship.

20. The display driving method according to claim 15, The scanning circuit includes a first scanning circuit, a second scanning circuit and a third scanning circuit; wherein the third scanning circuit is after the second scanning circuit, and the second scanning circuit is after the first scanning circuit; If one of the first scanning circuit and the third scanning circuit does not perform the scanning action, the other scanning circuit of the first scanning circuit and the third scanning circuit scans all the corresponding parts; The second scanning circuit only scans a portion of the corresponding portion.

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