Adapter plate and clamp for display screen test

Abstract

The utility model discloses an adapter plate and a clamp used for display screen testing. The adapter plate comprises a display screen connector, a first switch module, a second switch module, a third switch module, a fourth switch module and a fifth switch module. The first switch module is connected with the first voltage output end, the second switch module, the third switch module, the fourth switch module and the fifth switch module; the second switch module is connected with the display screen connector and the backlight voltage output end, and the second switch module is switched on when the first voltage is accessed; the third switch module is connected with the display screen connector and the positive bias voltage output end, and the third switch module is switched on when the first voltage is accessed; the fourth switch module is connected with the display screen connector and the first voltage output end, and the fourth switch module is switched on when the first voltage is accessed; the fifth switch module is connected with the display screen connector and the negative bias voltage output end, and the fifth switch module is switched on when the first voltage is connected. When the display screen is replaced, the adapter plate is replaced in a power-off mode.

Description

Technical Field

[0001] The utility model relates to the technical field of display screen testing, in particular to an adapter plate and a fixture for display screen testing. Background Art

[0002] The display screens used in electronic products such as mobile phones and tablets need to be tested before leaving the factory. When testing the display screen, the display screen is tested through a test motherboard. The test motherboard has a backlight voltage output terminal, a first voltage output terminal, a positive bias output terminal, and a negative bias output terminal. The display screen is powered directly through the test motherboard.

[0003] Currently, when a display screen is tested using a head, after one display screen is tested, another display screen is directly replaced for testing. Therefore, there is a problem of hot plugging and damaging the display screen during the replacement process.

[0004] Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an adapter plate and a fixture for display screen testing, so as to solve the problem in the prior art of damaging the display screen due to hot plugging during the replacement of the display screen.

[0006] The utility model provides an adapter board for display screen testing, the adapter board is connected to a test mainboard for testing the display screen, the test mainboard includes a backlight voltage output terminal, a first voltage output terminal, a positive bias voltage output terminal and a negative bias voltage output terminal, the adapter board includes: a display screen connector, a first switch module, a second switch module, a third switch module, a fourth switch module and a fifth switch module;

[0007] The first switch module is connected to the first voltage output end, the second switch module, the third switch module, the fourth switch module, and the fifth switch module. The first switch module is configured to connect the first voltage output from the first voltage output end to the second switch module, the third switch module, the fourth switch module, and the fifth switch module when the first switch module is turned on.

[0008] The second switch module is connected to the display screen connector and the backlight voltage output terminal, and the second switch module is turned on when connected to the first voltage. The second switch module is used to connect the backlight voltage output from the backlight voltage output terminal to the display screen connector when turned on;

[0009] The third switch module is connected to the display screen connector and the positive bias voltage output terminal. The third switch module is turned on when connected to the first voltage. The third switch module is used to connect the positive bias voltage output from the positive bias voltage output terminal to the display screen connector when turned on.

[0010] The fourth switch module is connected to the display screen connector and the first voltage output end. The fourth switch module is turned on when connected to the first voltage. The fourth switch module is used to connect the first voltage output by the first voltage output end to the display screen connector when turned on.

[0011] The fifth switch module is connected to the display screen connector and the negative bias output end. The fifth switch module is turned on when connected to the first voltage. The fifth switch module is used to connect the negative bias output from the negative bias output end to the display screen connector when turned on.

[0012] In a further configuration of the present invention, the first switch module includes:

[0013] a first switch, the first switch comprising a first end, a second end, and a third end, the first end being connected to the first voltage output end, the second end being connected to the second switch module, the third switch module, and the fourth switch module, and the third end being connected to the fifth switch module;

[0014] a pull-down resistor, one end of the pull-down resistor being connected to the second end, and the other end of the pull-down resistor being grounded;

[0015] When the first switch is turned on, the first voltage output by the first voltage output terminal is connected to the second switch module, the third switch module, the fourth switch module and the fifth switch module.

[0016] According to a further configuration of the present invention, the second switch module includes: a first switch tube, a second switch tube, a first resistor and a second resistor;

[0017] The source of the first switch tube is connected to the backlight voltage output terminal, the gate of the first switch tube is connected to the drain of the second switch tube, and the drain of the first switch tube is connected to the display screen connector;

[0018] The gate of the second switch tube is connected to the second end, and the source of the second switch tube is grounded;

[0019] One end of the first resistor is connected to the source of the first switch tube, and the other end of the first resistor is connected to the drain of the second switch tube;

[0020] One end of the second resistor is connected to the drain of the second switch tube, and the other end of the second resistor is grounded.

[0021] In a further configuration of the present invention, the second switch module further includes: a first filtering unit and a second filtering unit;

[0022] The first filtering unit is connected to the source of the first switching tube and the connection end of the first resistor;

[0023] The second filtering unit is connected to the drain of the first switching tube.

[0024] In a further configuration of the present invention, the third switch module includes: a third switch tube, a fourth switch tube, a third resistor and a fourth resistor;

[0025] The source of the third switch tube is connected to the positive bias output terminal, the gate of the third switch tube is connected to the drain of the fourth switch tube, and the drain of the third switch tube is connected to the display screen connector;

[0026] The gate of the fourth switch tube is connected to the second end, and the source of the fourth switch tube is grounded;

[0027] One end of the third resistor is connected to the source of the third switch tube, and the other end of the third resistor is connected to the drain of the fourth switch tube;

[0028] One end of the fourth resistor is connected to the drain of the fourth switch tube, and the other end of the fourth resistor is grounded.

[0029] In a further configuration of the present invention, the third switch module further includes: a third filtering unit and a fourth filtering unit;

[0030] The third filtering unit is connected to the source of the third switch tube and the connection end of the third resistor;

[0031] The fourth filtering unit is connected to the drain of the third switching tube.

[0032] In a further configuration of the present invention, the fourth switch module includes: a fifth switch tube, a sixth switch tube, a fifth resistor and a sixth resistor;

[0033] The source of the fifth switch tube is connected to the first voltage output terminal, the gate of the fifth switch tube is connected to the drain of the sixth switch tube, and the drain of the fifth switch tube is connected to the display screen connector;

[0034] The gate of the sixth switch tube is connected to the second end, and the source of the sixth switch tube is grounded;

[0035] One end of the fifth resistor is connected to the gate of the fifth switch tube, and the other end of the fifth resistor is connected to the drain of the sixth switch tube;

[0036] One end of the sixth resistor is connected to the drain of the fifth switch tube, and the other end of the sixth resistor is grounded.

[0037] In a further configuration of the present invention, the fourth switch module further includes: a fifth filtering unit and a sixth filtering unit;

[0038] The fifth filtering unit is connected to the source of the fifth switch tube and the connection end of the fifth resistor;

[0039] The sixth filtering unit is connected to the drain of the fifth switching tube.

[0040] According to a further configuration of the present invention, the fifth switch module includes: a seventh switch tube, a seventh resistor, an eighth resistor, a seventh filter unit and an eighth filter unit;

[0041] The gate of the seventh switch tube is connected to the third end, the source of the seventh switch tube is connected to the negative bias output end, and the drain of the seventh switch tube is connected to the display screen connector;

[0042] One end of the seventh resistor is connected to the source of the seventh switch tube, and the other end of the seventh resistor is connected to the gate of the seventh switch tube;

[0043] One end of the eighth resistor is connected to the drain of the seventh switch tube, and the other end of the eighth resistor is grounded;

[0044] The seventh filtering unit is connected to the connection end of the seventh resistor and the seventh switching tube;

[0045] The eighth filtering unit is connected to the drain of the seventh switching tube.

[0046] The utility model also provides a fixture for display screen testing, comprising: a housing, a testing mainboard for testing the display screen, and the adapter board for display screen testing as described above;

[0047] The test mainboard is arranged in the housing, and the test mainboard is connected to the display screen connector in the adapter board for display screen testing.

[0048] Beneficial effects:

[0049] When testing the display screen, the display screen is connected to the display screen connector, and the first voltage is connected to the second switch module, the third switch module, the fourth switch module and the fifth switch module by controlling the first switch module to be turned on. The second switch module, the third switch module, the fourth switch module and the fifth switch module are turned on. At this time, the first voltage output by the first voltage output terminal, the backlight voltage output by the backlight voltage output terminal, the positive bias voltage output by the positive bias output terminal and the negative bias voltage output by the negative bias output terminal are output to the display screen through the display screen connector to supply power to the display screen for testing. When replacing the display screen, the first switch module is controlled to be disconnected, and the display screen is powered off. It can be seen that the adapter board used for display screen testing is replaced with power off when the display screen is replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0051] Figure 1 This is a principle block diagram of the adapter board used for display screen testing in the utility model.

[0052] Figure 2 This is a circuit diagram of the second switch module in one embodiment of the present utility model.

[0053] Figure 3 This is a circuit diagram of the third switch module in one embodiment of the present utility model.

[0054] Figure 4 This is a circuit diagram of the fourth switch module in an embodiment of the present utility model.

[0055] Figure 5 This is a circuit diagram of the fifth switch module in one embodiment of the present utility model.

[0056] Figure 6 It is a structural diagram of a metal dome in the prior art of the present invention.

[0057] Markings in the accompanying drawings: 10, first switch module; 101, first switch; 1011, first end; 1012, second end; 1013, third end; 1014, pull-down resistor; 11, second switch module; 111, first filter unit; 112, second filter unit; 12, third switch module; 121, third filter unit; 122, fourth filter unit; 13, fourth switch module; 131, fifth filter unit; 132, sixth filter unit; 14, fifth switch module; 141, seventh filter unit; 142, eighth filter unit; 15, display connector; 16, display; 17, metal dome; Q1, first switch tube; Q2, second switch tube; Q3, the third switching tube; Q4, the fourth switching tube; Q5, the fifth switching tube; Q6, the sixth switching tube; Q7, the seventh switching tube; R1, the first resistor; R2, the second resistor; R3, the third resistor; R4, the fourth resistor; R5, the fifth resistor; R6, the sixth resistor; R7, the seventh resistor; R8, the eighth resistor; C1, the first capacitor; C2, the second capacitor; C3, the third capacitor; C4, the fourth capacitor; C5, the fifth capacitor; C6, the sixth capacitor; C7, the seventh capacitor; C8, the eighth capacitor; C9, the ninth capacitor; C10, the tenth capacitor; C11, the eleventh capacitor; C12, the twelfth capacitor; C13, the thirteenth capacitor; C14, the fourteenth capacitor. DETAILED DESCRIPTION

[0058] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0059] like Figure 1 As shown, an adapter board for testing a display screen 16 provided by the present invention is connected to a test main board for testing the display screen 16. The test main board includes a backlight voltage output terminal, a first voltage output terminal, a positive bias output terminal, and a negative bias output terminal.

[0060] The adapter board may include a display screen connector 15 , a first switch module 10 , a second switch module 11 , a third switch module 12 , a fourth switch module 13 and a fifth switch module 14 .

[0061] Among them, the first switch module 10 is connected to the first voltage output terminal, the second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14. The first switch module 10 is used to connect the first voltage output from the first voltage output terminal to the second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14 when it is turned on; the second switch module 11 is connected to the display connector 15 and the backlight voltage output terminal, and the second switch module 11 is turned on when the first voltage is connected. The second switch module 11 is used to connect the backlight voltage output from the backlight voltage output terminal to the display connector 15 when it is turned on; the third switch module 12 is connected to the display connector 15 and the positive bias The first and second switch modules 13 are connected to the display screen connector 15 and the first voltage output terminal, and the third switch module 12 is turned on when the first voltage is connected. The third switch module 12 is used to connect the positive bias voltage output from the positive bias voltage output terminal to the display screen connector 15 when it is turned on; the fourth switch module 13 is connected to the display screen connector 15 and the first voltage output terminal, and the fourth switch module 13 is turned on when the first voltage is connected. The fourth switch module 13 is used to connect the first voltage output from the first voltage output terminal to the display screen connector 15 when it is turned on; the fifth switch module 14 is connected to the display screen connector 15 and the negative bias voltage output terminal, and the fifth switch module 14 is turned on when the first voltage is connected. The fifth switch module 14 is used to connect the negative bias voltage output from the negative bias voltage output terminal to the display screen connector 15 when it is turned on.

[0062] Specifically, when testing the display screen 16, the display screen 16 is connected to the display screen connector 15. Thereafter, the first voltage is connected to the second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14 by controlling the first switch module 10 to be turned on. The second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14 are turned on. At this time, the first voltage output by the first voltage output terminal, the backlight voltage output by the backlight voltage output terminal, the positive bias voltage output by the positive bias output terminal and the negative bias voltage output by the negative bias output terminal are output to the display screen 16 via the display screen connector 15 to supply power to the display screen 16 for testing. When replacing the display screen 16, the first switch module 10 is controlled to be disconnected, and the display screen 16 is powered off. It can be seen that the adapter board used for testing the display screen 16 is powered off when replacing the display screen 16, that is, the display screen 16 is in a powered-off state.

[0063] It should be noted that the test mainboard is a mainboard commonly used in the prior art for testing the display screen 16. The test mainboard can not only output the electrical signals required by the display screen 16 (backlight voltage, first voltage, positive bias voltage and negative bias voltage), but also output the clock, data and other signals required for the display screen 16 test. When testing the display screen 16, the clock, data and other signals required for the display screen 16 test output by the test mainboard can also be directly output to the adapter board, and then output to the display screen 16 through the adapter board.

[0064] In this embodiment, the display screen connector 15 may be a FPC (Flexible Printed Circuit) connector.

[0065] In some embodiments, as Figure 1 As shown, the first switch module 10 may include a first switch 101 and a pull-down resistor 1014. The first switch 101 may include a first end 1011, a second end 1012 and a third end 1013. The first end 1011 is connected to the first voltage output end, the second end 1012 is connected to the second switch module 11, the third switch module 12 and the fourth switch module 13, the third end 1013 is connected to the fifth switch module 14, one end of the pull-down resistor 1014 is connected to the second end 1012, and the other end of the pull-down resistor 1014 is grounded; wherein, when the first switch 101 is turned on, the first voltage output from the first voltage output end is connected to the second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14.

[0066] Specifically, the first switch 101 can be a three-pin switch, and the three connection pins of the three-pin switch are respectively a first end 1011, a second end 1012 and a third end 1013. When the three-pin switch is used, the first voltage output end is connected to one pin of the three-pin switch, the second switch module 11, the third switch module 12 and the fourth switch module 13 are connected to one pin of the three-pin switch, and the fifth switch module 14 is connected to one pin of the three-pin switch.

[0067] In this example, when testing the display screen 16, the first switch 101 is turned on, and the first voltage output from the first voltage output end is connected to the second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14, so that the second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14 are in the on state, so that the first voltage is connected to the display screen 16 installed on the display screen connector 15 through the display screen connector 15, the backlight voltage is connected to the display screen 16 installed on the display screen connector 15 through the display screen connector 15, the positive bias voltage is connected to the display screen 16 installed on the display screen connector 15 through the display screen connector 15, and the negative bias voltage is connected to the display screen 16 installed on the display screen connector 15 through the display screen connector 15.

[0068] It can be seen that when replacing the display screen 16 under power-off condition, the display screen 16 can be replaced by simply turning on the first switch 101 , which is simple and convenient to operate.

[0069] In some embodiments, as Figure 2 As shown, the second switch module 11 may include a first switch tube Q1, a second switch tube Q2, a first resistor R1 and a second resistor R2; the source of the first switch tube Q1 is connected to the backlight voltage output end, the gate of the first switch tube Q1 is connected to the drain of the second switch tube Q2, and the drain of the first switch tube Q1 is connected to the display screen connector 15; the gate of the second switch tube Q2 is connected to the second end 1012, and the source of the second switch tube Q2 is grounded; one end of the first resistor R1 is connected to the source of the first switch tube Q1, and the other end of the first resistor R1 is connected to the drain of the second switch tube Q2; one end of the second resistor R2 is connected to the drain of the second switch tube Q2, and the other end of the second resistor R2 is grounded.

[0070] Specifically, the second switch Q2 may be an N-MOS (N-Metal-Oxide-Semiconductor) transistor, and the first switch Q1 may be a P-MOS (P-Metal-Oxide-Semiconductor) transistor.

[0071] When the first switch tube Q1 is connected to the backlight voltage output terminal, the connection can be but not limited to being made through a conductive probe, one end of the probe is connected to the backlight voltage output terminal, and the other end of the probe is connected to the source of the first switch tube Q1.

[0072] Similarly, when the second switch tube Q2 is connected to the first switch 101, the connection can be made through a conductive member, for example, a conductive probe; for another example, a metal spring 17 can be used to connect the second switch tube Q2 and the first switch 101. Figure 6As shown in the figure, it is a structural diagram of a metal spring 17 used in the prior art. When the metal spring 17 is used for connection, Figure 6 The metal spring 17 shown is connected.

[0073] In this embodiment, when the second switch module 11 is turned on, the first voltage output from the first voltage output end is connected to the second switch tube Q2 through the first switch 101. At this time, the second switch tube Q2 is turned on, and then the first switch tube Q1 is turned on, so that the backlight voltage output from the backlight voltage output end is connected to the display screen connector 15 through the first switch tube Q1.

[0074] Furthermore, if Figure 2 As shown, the second switch module 11 further includes a first filter unit 111 and a second filter unit 112; the first filter unit 111 is connected to the source of the first switch tube Q1 and the connection end of the first resistor R1; the second filter unit 112 is connected to the drain of the first switch tube Q1.

[0075] Specifically, the first filtering unit 111 may include a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 and one end of the second capacitor C2 are connected to the connection end of the first resistor R1 and the source of the first switch tube Q1, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded.

[0076] The second filtering unit 112 may include a third capacitor C3 and a fourth capacitor C4. One end of the third capacitor C3 and one end of the fourth capacitor C4 are connected to the drain of the first switch Q1. The other end of the third capacitor C3 and the other end of the fourth capacitor C4 are grounded.

[0077] In this embodiment, the first filtering unit 111 and the second filtering unit 112 can filter out interference signals.

[0078] In some embodiments, as Figure 3 As shown, the third switch module 12 may include a third switch tube Q3, a fourth switch tube Q4, a third resistor R3 and a fourth resistor R4; the source of the third switch tube Q3 is connected to the positive bias output terminal, the gate of the third switch tube Q3 is connected to the drain of the fourth switch tube Q4, and the drain of the third switch tube Q3 is connected to the display screen connector 15; the gate of the fourth switch tube Q4 is connected to the second terminal 1012, and the source of the fourth switch tube Q4 is grounded; one end of the third resistor R3 is connected to the source of the third switch tube Q3, and the other end of the third resistor R3 is connected to the drain of the fourth switch tube Q4; one end of the fourth resistor R4 is connected to the drain of the fourth switch tube Q4, and the other end of the fourth resistor R4 is grounded.

[0079] Specifically, the third switch tube Q3 may be a P-MOS transistor, and the fourth transistor may be an N-MOS transistor.

[0080] When the third switch tube Q3 is connected to the positive bias output terminal, the connection can be but is not limited to being made through a conductive probe, one end of the probe is connected to the positive bias output terminal, and the other end of the probe is connected to the source of the third switch tube Q3.

[0081] When the fourth switch tube Q4 is connected to the first switch 101 , the connection method between the second switch tube Q2 and the first switch 101 may be referred to, and will not be repeated here.

[0082] In this embodiment, when the third switch module 12 is turned on, the first voltage output from the first voltage output terminal is connected to the fourth switch tube Q4 through the first switch 101. At this time, the fourth switch tube Q4 is turned on. Thereafter, the fourth switch tube Q4 is turned on, so that the positive voltage output from the positive bias output terminal is connected to the display screen connector 15 through the third switch tube Q3.

[0083] Furthermore, if Figure 3 As shown, the third switch module 12 further includes a third filter unit 121 and a fourth filter unit 122. The third filter unit 121 is connected to the source of the third switch tube Q3 and the connection end of the third resistor R3; the fourth filter unit 122 is connected to the drain of the third switch tube Q3.

[0084] Specifically, the third filtering unit 121 may include a fifth capacitor C5 and a sixth capacitor C6, one end of the fifth capacitor C5 and one end of the sixth capacitor C6 are commonly connected to the connection end of the third resistor R3 and the source of the third switch tube Q3, and the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are grounded.

[0085] The fourth filtering unit 122 may include a seventh capacitor C7 and an eighth capacitor C8. One end of the seventh capacitor C7 and one end of the eighth capacitor C8 are connected to the drain of the third switch Q3. The other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are grounded.

[0086] In this embodiment, the interference signal can be filtered out by the third filtering unit 121 and the fourth filtering unit 122 .

[0087] In some embodiments, as Figure 4As shown, the fourth switch module 13 may include a fifth switch tube Q5, a sixth switch tube Q6, a fifth resistor R5 and a sixth resistor R6; the source of the fifth switch tube Q5 is connected to the first voltage output end, the gate of the fifth switch tube Q5 is connected to the drain of the sixth switch tube Q6, and the drain of the fifth switch tube Q5 is connected to the display screen connector 15; the gate of the sixth switch tube Q6 is connected to the second end 1012, and the source of the sixth switch tube Q6 is grounded; one end of the fifth resistor R5 is connected to the gate of the fifth switch tube Q5, and the other end of the fifth resistor R5 is connected to the drain of the sixth switch tube Q6; one end of the sixth resistor R6 is connected to the drain of the fifth switch tube Q5, and the other end of the sixth resistor R6 is grounded.

[0088] Specifically, the fifth switch tube Q5 may be a P-MOS transistor, and the sixth switch tube Q6 may be an N-MOS transistor.

[0089] When the source of the fifth switch tube Q5 is connected to the first voltage output terminal, the connection can be but is not limited to being made through a conductive probe, one end of the probe is connected to the first voltage output terminal, and the other end of the probe is connected to the source of the fifth switch tube Q5.

[0090] The connection between the sixth switch tube Q6 and the first switch 101 may refer to the connection between the second switch tube Q2 and the first switch 101 , and will not be repeated here.

[0091] In this embodiment, when the fourth switch module 13 is turned on, the first voltage output from the first voltage output terminal is connected to the sixth switch tube Q6 through the first switch 101. At this time, the sixth switch tube Q6 is turned on, and then the fifth switch tube Q5 is turned on, so that the first voltage output from the first voltage output terminal is connected to the display screen connector 15 through the fifth switch tube Q5.

[0092] Furthermore, the fourth switch module 13 further includes a fifth filter unit 131 and a sixth filter unit 132 ; the fifth filter unit 131 is connected to the source of the fifth switch tube Q5 and the connection end of the fifth resistor R5 ; the sixth filter unit 132 is connected to the drain of the fifth switch tube Q5 .

[0093] Specifically, the fifth filtering unit 131 may include a ninth capacitor C9 and a tenth capacitor C10, one end of the ninth capacitor C9 and one end of the tenth capacitor C10 are connected to the source of the fifth switch tube Q5 and the connection end of the fifth resistor R5, and the other end of the ninth capacitor C9 and the other end of the tenth capacitor C10 are grounded.

[0094] The sixth filtering unit 132 may include an eleventh capacitor C11 and a twelfth capacitor C12. One end of the eleventh capacitor C11 and one end of the twelfth capacitor C12 are connected to the drain of the fifth switch Q5. The other end of the eleventh capacitor C11 and the other end of the twelfth capacitor C12 are grounded.

[0095] In this embodiment, the interference signal can be filtered out by the fifth filtering unit 131 and the sixth filtering unit 132 .

[0096] In some embodiments, as Figure 5 As shown, the fifth switch module 14 may include a seventh switch tube Q7, a seventh resistor R7, an eighth resistor R8, a seventh filtering unit 141, and an eighth filtering unit 142; the gate of the seventh switch tube Q7 is connected to the third terminal 1013, the source of the seventh switch tube Q7 is connected to the negative bias output terminal, and the drain of the seventh switch tube Q7 is connected to the display connector 15; one end of the seventh resistor R7 is connected to the source of the seventh switch tube Q7, and the other end of the seventh resistor R7 is connected to the gate of the seventh switch tube Q7; one end of the eighth resistor R8 is connected to the drain of the seventh switch tube Q7, and the other end of the eighth resistor R8 is grounded; the seventh filtering unit 141 is connected to the connection terminal between the seventh resistor R7 and the seventh switch tube Q7;

[0097] The eighth filtering unit 142 is connected to the drain of the seventh switch tube Q7 .

[0098] Specifically, the seventh switch tube Q7 can be an N-MOS transistor.

[0099] When the source of the seventh switch tube Q7 is connected to the negative voltage output terminal, the connection can be but is not limited to being made through a conductive probe, one end of the probe is connected to the negative voltage output terminal, and the other end of the probe is connected to the gate of the seventh switch tube Q7.

[0100] In this embodiment, when the fifth switch module 14 is turned on, the first voltage output from the first voltage output end is connected to the seventh switch tube Q7 through the first switch 101. At this time, the seventh switch tube Q7 is turned on, so that the negative bias voltage output from the negative bias output end is connected to the display screen connector 15 through the seventh switch tube Q7.

[0101] In this embodiment, the seventh filtering unit 141 may include a thirteenth capacitor C13 and a fourteenth capacitor C14. One end of the thirteenth capacitor C13 and one end of the fourteenth capacitor C14 are commonly connected to the connection end of the seventh resistor R7 and the source of the seventh switch transistor Q7. The other end of the thirteenth capacitor C13 and the other end of the fourteenth capacitor C14 are grounded.

[0102] The eighth filtering unit 142 may include a fifteenth capacitor and a sixteenth capacitor. One end of the fifteenth capacitor and one end of the sixteenth capacitor are connected to the drain of the seventh switch Q7 , and the other end of the fifteenth capacitor and the other end of the sixteenth capacitor are grounded.

[0103] In this embodiment, the interference signal can be filtered out by the seventh filtering unit 141 and the eighth filtering unit 142 .

[0104] In some embodiments, the present invention also provides a fixture for testing the display screen 16, which may include a shell, a test mainboard for testing the display screen 16, and an adapter board for testing the display screen 16 as described above; wherein, the test mainboard is arranged in the shell, and the test mainboard is connected to the adapter board for testing the display screen 16 and the display screen 16.

[0105] Specifically, the adapter board for testing the display screen 16 can be integrated on a printed circuit board (PCB), and the display screen connector 15 in the adapter board for testing the display screen 16 can be an FPC connector, one end of which is integrated on the printed circuit board, and the other end of the FPC connector is connected to the display screen 16 when testing the display screen 16.

[0106] This test motherboard is a commonly used test board for testing display screen 16. Test software is burned into the test motherboard. When connected to display screen 16, the test motherboard is connected to a printed circuit board (PCB) integrated with an adapter board via an FPC connector. This allows the test motherboard to be connected to display screen 16 via the FPC connector (the FPC connector connecting the test motherboard to the PCB), the PCB, and the FPC connector (the FPC connector connecting the PCB to display screen 16). When powered, the test motherboard is supplied with power from a power supply and has a first voltage output terminal, a backlight voltage output terminal, a positive bias voltage output terminal, and a negative bias voltage output terminal.

[0107] In this embodiment, a test mainboard is mounted within a housing, which has a mounting slot that matches a printed circuit board with an integrated adapter board, and the printed circuit board with an integrated adapter board is mounted within the mounting slot. Furthermore, a first button, a second button, and a third button are provided on the housing, each of which is connected to the test mainboard. The first button is a power button for the test mainboard. When testing the display screen 16, the lines and color scale of the touchpad (TP) on the display screen 16 need to be tested. Pressing the second button tests the lines on the touchpad via the test mainboard, and pressing the third button tests the color scale via the test mainboard.

[0108] Furthermore, the first switch 101 in the first switch module 10 is mounted on the housing.

[0109] In this embodiment, when testing the display screen 16, the display screen 16 is connected to an FPC connector (the FPC connector that connects the printed circuit board to the display screen 16), the test mainboard is turned on by pressing the first button, and the first switch 101 is pressed (the display screen 16 is awakened). The test mainboard then automatically begins testing the color scale. After the color scale test, the second button is pressed, and the test mainboard then tests the touchpad stroke. After the touchpad stroke test is completed, the third button is pressed, and the test mainboard returns to the color scale test. After testing one display screen 16, the first switch 101 is pressed (the display screen 16 is off, i.e., the display screen 16 is powered off), and the display screen 16 is replaced.

[0110] It can be seen that the fixture for testing the display screen 16 is replaced with power off when the display screen 16 is replaced; in addition, the test main board uses the existing test main board, which does not need to be customized separately, saving costs.

[0111] In summary, the present invention provides an adapter board and a fixture for testing a display screen 16. When testing the display screen 16, the display screen 16 is connected to the display screen connector 15. By controlling the first switch module 10 to be turned on, the first voltage is connected to the second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14. The second switch module 11, the third switch module 12, the fourth switch module 13 and the fifth switch module 14 are turned on. At this time, the first voltage output by the first voltage output end, the backlight voltage output by the backlight voltage output end, the positive bias voltage output by the positive bias output end and the negative bias voltage output by the negative bias output end are output to the display screen 16 through the display screen connector 15 to supply power to the display screen 16 for testing. When replacing the display screen 16, the first switch module 10 is controlled to be disconnected, and the display screen 16 is powered off. It can be seen that the adapter board for testing the display screen 16 is powered off when the display screen 16 is replaced.

[0112] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An adapter board for display screen testing, the adapter board being connected to a test mainboard for testing the display screen, the test mainboard comprising a backlight voltage output terminal, a first voltage output terminal, a positive bias voltage output terminal, and a negative bias voltage output terminal, characterized in that: The adapter board includes: a display screen connector, a first switch module, a second switch module, a third switch module, a fourth switch module and a fifth switch module; The first switch module is connected to the first voltage output end, the second switch module, the third switch module, the fourth switch module, and the fifth switch module. The first switch module is configured to connect the first voltage output from the first voltage output end to the second switch module, the third switch module, the fourth switch module, and the fifth switch module when the first switch module is turned on. The second switch module is connected to the display screen connector and the backlight voltage output terminal, and the second switch module is turned on when connected to the first voltage. The second switch module is used to connect the backlight voltage output from the backlight voltage output terminal to the display screen connector when turned on; The third switch module is connected to the display screen connector and the positive bias voltage output terminal. The third switch module is turned on when connected to the first voltage. The third switch module is used to connect the positive bias voltage output from the positive bias voltage output terminal to the display screen connector when turned on. The fourth switch module is connected to the display screen connector and the first voltage output end. The fourth switch module is turned on when connected to the first voltage. The fourth switch module is used to connect the first voltage output by the first voltage output end to the display screen connector when turned on. The fifth switch module is connected to the display screen connector and the negative bias output end. The fifth switch module is turned on when connected to the first voltage. The fifth switch module is used to connect the negative bias output from the negative bias output end to the display screen connector when turned on.

2. The adapter board for display screen testing according to claim 1, wherein: The first switch module includes: a first switch, the first switch comprising a first end, a second end, and a third end, the first end being connected to the first voltage output end, the second end being connected to the second switch module, the third switch module, and the fourth switch module, and the third end being connected to the fifth switch module; a pull-down resistor, one end of the pull-down resistor being connected to the second end, and the other end of the pull-down resistor being grounded; When the first switch is turned on, the first voltage output by the first voltage output terminal is connected to the second switch module, the third switch module, the fourth switch module and the fifth switch module.

3. The adapter board for display screen testing according to claim 2, wherein: The second switch module includes: a first switch tube, a second switch tube, a first resistor and a second resistor; The source of the first switch tube is connected to the backlight voltage output terminal, the gate of the first switch tube is connected to the drain of the second switch tube, and the drain of the first switch tube is connected to the display screen connector; The gate of the second switch tube is connected to the second end, and the source of the second switch tube is grounded; One end of the first resistor is connected to the source of the first switch tube, and the other end of the first resistor is connected to the drain of the second switch tube; One end of the second resistor is connected to the drain of the second switch tube, and the other end of the second resistor is grounded.

4. The adapter board for display screen testing according to claim 3, wherein: The second switch module further includes: a first filtering unit and a second filtering unit; The first filtering unit is connected to the source of the first switching tube and the connection end of the first resistor; The second filtering unit is connected to the drain of the first switching tube.

5. The adapter board for display screen testing according to claim 2, wherein: The third switch module includes: a third switch tube, a fourth switch tube, a third resistor and a fourth resistor; The source of the third switch tube is connected to the positive bias output terminal, the gate of the third switch tube is connected to the drain of the fourth switch tube, and the drain of the third switch tube is connected to the display screen connector; The gate of the fourth switch tube is connected to the second end, and the source of the fourth switch tube is grounded; One end of the third resistor is connected to the source of the third switch tube, and the other end of the third resistor is connected to the drain of the fourth switch tube; One end of the fourth resistor is connected to the drain of the fourth switch tube, and the other end of the fourth resistor is grounded.

6. The adapter board for display screen testing according to claim 5, characterized in that: The third switch module further includes: a third filtering unit and a fourth filtering unit; The third filtering unit is connected to the source of the third switch tube and the connection end of the third resistor; The fourth filtering unit is connected to the drain of the third switching tube.

7. The adapter board for display screen testing according to claim 2, wherein: The fourth switch module includes: a fifth switch tube, a sixth switch tube, a fifth resistor and a sixth resistor; The source of the fifth switch tube is connected to the first voltage output terminal, the gate of the fifth switch tube is connected to the drain of the sixth switch tube, and the drain of the fifth switch tube is connected to the display screen connector; The gate of the sixth switch tube is connected to the second end, and the source of the sixth switch tube is grounded; One end of the fifth resistor is connected to the gate of the fifth switch tube, and the other end of the fifth resistor is connected to the drain of the sixth switch tube; One end of the sixth resistor is connected to the drain of the fifth switch tube, and the other end of the sixth resistor is grounded.

8. The adapter board for display screen testing according to claim 7, wherein: The fourth switch module further includes: a fifth filtering unit and a sixth filtering unit; The fifth filtering unit is connected to the source of the fifth switch tube and the connection end of the fifth resistor; The sixth filtering unit is connected to the drain of the fifth switching tube.

9. The adapter board for display screen testing according to claim 2, wherein: The fifth switch module includes: a seventh switch tube, a seventh resistor, an eighth resistor, a seventh filter unit and an eighth filter unit; The gate of the seventh switch tube is connected to the third end, the source of the seventh switch tube is connected to the negative bias output end, and the drain of the seventh switch tube is connected to the display screen connector; One end of the seventh resistor is connected to the source of the seventh switch tube, and the other end of the seventh resistor is connected to the gate of the seventh switch tube; One end of the eighth resistor is connected to the drain of the seventh switch tube, and the other end of the eighth resistor is grounded; The seventh filtering unit is connected to the connection end of the seventh resistor and the seventh switching tube; The eighth filtering unit is connected to the drain of the seventh switching tube.

10. A fixture for display screen testing, characterized in that: include: A housing, a test mainboard for testing a display screen, and an adapter board for display screen testing according to any one of claims 1 to 9; The test mainboard is arranged in the housing, and the test mainboard is connected to the display screen connector in the adapter board for display screen testing.

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