DISPLAY PANEL AND A DRIVING MODULE OF THE DISPLAY PANEL

• US 20180018913A1
• Filed: 05/05/2017
• Published: 01/18/2018
• Est. Priority Date: 07/14/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, JEEHWAL, Kong, Kiho, Kim, Youngmin, Sung, Wangsuk, Jeong, Euihyuk
• Granted Patent: US 10,614,744 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/0243 Details of the generation of driving signals
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0278 Details of driving circuits arranged to drive both scan and data electrodes
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165

Abstract

A display panel includes a display module including a plurality of pixels connected to gate lines and source lines and a driver module configured to apply driving voltages to the gate lines and the source lines. The driver module includes a driving voltage generator configured to generate the driving voltages and a calibration circuit configured to compare each of the driving voltages with a reference voltage and to output a calibration parameter according to a comparison result. The driving voltage generator calibrates each of the driving voltages using the calibration parameter.

Claims

1. A display panel comprising:

a display module comprising a plurality of pixels connected to gate lines and source lines; and

a driver module configured to apply driving voltages to the gate lines and the source lines,

wherein the driver module comprises;

a driving voltage generator configured to generate the driving voltages; and

a calibration circuit configured to compare each of the driving voltages with a reference voltage and to output a calibration parameter according to a comparison result,

wherein the driving voltage generator calibrates each of the driving voltages using the calibration parameter.

2. The display panel of claim 1, wherein the driver module is a mobile driver module and the display module is a mobile display module.

3. The display panel of claim 1, wherein the calibration circuit is configured to receive the reference voltage from a terminal to which a voltage is supplied from outside of the display panel.

4. The display panel of claim 1,

wherein the driver module further comprises a first interface configured to communicate with a first external device and a second interface configured to communicate with a second external device, and

wherein the driving voltage generator and the calibration circuit adjust each of the driving voltages in response to a command received through one of the first interface and the second interface.

5. The display panel of claim 4,

wherein the first interface is configured to communicate with a processor, and

wherein the second interface is configured to communicate with a codec.

6. The display panel of claim 1,

wherein the driver module further comprises a nonvolatile memory,

wherein the calibration circuit stores the calibration parameter in the nonvolatile memory, and

wherein the driving voltage generator outputs the driving voltages using the calibration parameter stored in the nonvolatile memory.

7. The display panel of claim 6, wherein the nonvolatile memory is a one-time programmable memory.

8. The display panel of claim 1, wherein the driving voltage generator comprises:

a voltage generator configured to generate a first voltage;

a first amplifier configured to amplify the first voltage to a second voltage;

a plurality of string resistors connected in series between a node to which the second voltage is supplied and a ground node;

a decoder configured to output one of a plurality of voltages between the string resistors as a third voltage using the calibration parameter; and

a second amplifier configured to amplify the third voltage to output as each of the driving voltages.

9. The display panel of claim 1, wherein the calibration circuit comprises:

an amplifier configured to compare each of the driving voltages with the reference voltage and to output the comparison result as a fifth voltage; and

an analog-digital converter configured to digitize the fifth voltage and to output the digitized fifth voltage as the calibration parameter.

10. The display panel of claim 1, wherein the calibration circuit comprises:

an amplifier configured to perform a comparison operation to compare each of the driving voltages with the reference voltage and to output the comparison result as a fifth voltage;

a successive approximation register configured to store each bit of the calibration parameter according to the fifth voltage; and

a control circuit configured to control the amplifier to perform the comparison operation a predetermined number of times and to control the successive approximation register to store each bit of the calibration parameter.

11. The display panel of claim 10, wherein the driving voltage generator adjust the driving voltages according to each bit of the calibration parameter while the amplifier performs the comparison operation and the successive approximation register stores each bit of the calibration parameter.

12. The display panel of claim 1,

wherein the driving voltage generator individually generates the driving voltages, and

wherein the calibration circuit individually outputs the calibration parameters of each of the driving voltages.

13. The display panel of claim 1, wherein the driving voltages comprise source line driving voltages to be applied to the source lines and gate line driving voltages to be applied to the gate lines, and

wherein the driving voltage generator and the calibration circuit adjust the source line driving voltages and the gate line driving voltages separately.

14. A driver module of a display panel comprising:

a driving voltage generator configured to generate driving voltages; and

a calibration circuit configured to compare each of the driving voltages with a reference voltage and to output calibration parameters according to a comparison result,

wherein the driving voltage generator adjusts the driving voltages using the calibration parameters.

15. The driver module of claim 14, wherein the driving voltages are supplied to gate lines and source lines of a display module of the display panel.

16. A method of operating a driver module of a display panel, the method comprising:

receiving a calibration command;

entering a calibration mode in response to the calibration command;

generating a first driving voltage;

comparing the first driving voltage with a reference voltage to output a comparison result;

determining a calibration parameter using the comparison result;

storing the calibration parameter; and

calibrating the first driving voltage using the stored calibration parameter to generate a second driving voltage.

17. The method of claim 16, wherein

the first driving voltage has a level of a default driving voltage corresponding to a predetermined default value before calibrating the first driving voltage, and

the first driving voltage is calibrated within a predetermined range.

18. The method of claim 17, wherein

each bit of the calibration parameter corresponds to a number of voltage sections, and

calibrating the first driving voltage comprises adjusting the first driving voltage in a positive or negative direction according to the number of voltage sections for each bit of the calibration parameter.

19. The method of claim 16, further comprising:

completing the calibration mode;

combining the display panel with a plurality of components; and

prohibiting the calibration mode after the display panel is combined with the plurality of components.

20. The method of claim 16, further comprising:

supplying the reference voltage from a first external device to a reference voltage terminal in the calibration mode; and

supplying a power supply voltage from a second external device to the reference voltage terminal in a normal mode that is different from the calibration mode.