Virtual load board and test system and test method for liquid crystal display control board

• US 9,430,957 B2
• Filed: 10/18/2011
• Issued: 08/30/2016
• Est. Priority Date: 09/28/2011
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Li, Chun-jiang, Zhang, Xiao-xin, Liao, Shiue-shih, Tsai, Jung-mao
• Primary Examiner(s): Nguyen, Tung X
• Assistant Examiner(s): Clarke, Adam
• Application Number:
  US13/379,349
• Publication Number:
  US 20130076386A1
• Time in Patent Office: 1,778 Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/2849 Environmental or reliability testing, e.g. burn-in or validation tests of individual semiconductors G01R31/2642; of printed circuits boards G01R31/2817; of IC's G01R31/2855
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A virtual load board includes a connection port, a conversion circuit, and an indication unit, wherein the connection port comprises at least one terminal. The terminal receives an output voltage from the liquid crystal display control board. The conversion circuit converts the output voltage into an operating voltage for the indication unit and supplies the operating voltage to the indication unit. A test system and a test method for liquid crystal display control board are also provided. With the above-discussed arrangement, the virtual load board replaces a liquid crystal display panel to carry out a reliability test of the liquid crystal display control board, and has the advantages of small volume and low cost and can be accommodated, together with the liquid crystal display control board, in reliability test equipment in order to carry out a reliability test of the liquid crystal display control board in a specific environment.

Claims

1. A virtual load board, wherein the virtual load board comprises a connection port, a conversion circuit, and an indication unit, wherein the connection port comprises at least one terminal, the terminal adapted to receive an output voltage from a liquid crystal display control board, the conversion circuit connected to a reference voltage and receiving and converting the output voltage into an operating voltage for the indication unit and supplying the operating voltage to the indication unit;

wherein the conversion circuit comprises a first resistor component and a second resistor component connected in series between the terminal and the reference voltage and the indication unit has a first end directly connected to a node point between the first and second resistor components and a second end connected directly to the terminal or the reference voltage and is connected in parallel with the first resistor component or the second resistor component, which defines a division voltage that is supplied to the indication unit, whereby the indication unit is activated when the division voltage corresponds to the operating voltage of the indication unit.

2. The virtual load board as claimed in claim 1, wherein the indication unit comprises a light-emitting diode connected in parallel with the first resistor component or the second resistor component.

3. The virtual load board as claimed in claim 1, wherein the first resistor component or the second resistor component comprises a plurality of resistors connected in parallel.

4. The virtual load board as claimed in claim 1, wherein the conversion circuit further comprises a filter capacitor connected in series between the terminal and the reference voltage and in parallel with the conversion circuit.

5. The virtual load board as claimed in claim 1, wherein the output voltage comprises high gate voltage, low gate voltage, common voltage, a first operating voltage, or second operating voltage.

6. A test system for a liquid crystal display control board, wherein the test system comprises a virtual load board, the virtual load board adapted to connect to a liquid crystal display control board in order to monitor operation condition of the liquid crystal display control board with an indication unit, wherein the virtual load board comprises a connection port, a conversion circuit, and the indication unit, the connection port comprising at least one terminal, the terminal receiving an output voltage from the liquid crystal display control board, the conversion circuit connected to a reference voltage and receiving and converting the output voltage into an operating voltage for the indication unit and supplying the operating voltage to the indication unit;

wherein the conversion circuit comprises a first resistor component and a second resistor component connected in series between the terminal and the reference voltage and the indication unit has a first end directly connected to a node point between the first and second resistor components and a second end connected directly to the terminal or the reference voltage and is connected in parallel with the first resistor component or the second resistor component, which defines a division voltage that is supplied to the indication unit, whereby the indication unit is activated when the division voltage corresponds to the operating voltage of the indication unit.

7. The test system as claimed in claim 6, wherein the indication unit comprises a light-emitting diode connected in parallel with the first resistor component or the second resistor component.

8. The test system as claimed in claim 6, wherein the first resistor component or the second resistor component comprises a plurality of resistors connected in parallel.

9. The test system as claimed in claim 6, wherein the conversion circuit further comprises a filter capacitor connected in series between the terminal and the reference voltage and in parallel with the conversion circuit.

10. The test system as claimed in claim 6, wherein the output voltage comprises high gate voltage, low gate voltage, common voltage, a first operating voltage, or second operating voltage.

11. A test method for a liquid crystal display control board, wherein the test method comprises the following steps:

receiving an output voltage from a liquid crystal display control board;

operating a conversion circuit that is connected to a reference voltage and receives the output voltage for converting the output voltage into an operating voltage for an indication unit and supplying the operating voltage to the indication unit, wherein the conversion circuit comprises a first resistor component and a second resistor component connected in series between the terminal and the reference voltage and the indication unit has a first end directly connected to a node point between the first and second resistor components and a second end connected directly to the terminal or the reference voltage and is connected in parallel with the first resistor component or the second resistor component, which defines a division voltage that is supplied to the indication unit, whereby the indication unit is activated when the division voltage corresponds to the operating voltage of the indication unit; and

monitoring an operation condition of the liquid crystal display control board with the indication unit.

12. The test method as claimed in claim 11, wherein the step of operating a conversion circuit that is connected to a reference voltage and receives the output voltage for converting the output voltage into an operating voltage for an indication unit and supplying the operating voltage to the indication unit comprises:

performing filtration of the output voltage with a capacitor connected in parallel with the conversion circuit.