IP Library Granted Patent US 11,676,554
Granted Patent B2
US 11,676,554 · App. 17/316,092 · Granted Jun 13, 2023

Optimizing flickering of a liquid crystal display

Inventors: ChaoKai Huang (Taipei County, TW); Dan Odell Boice (Taipei, TW); MengFeng Hung (Taoyuan, TW); ChingFeng Chen (New Taipei, TW); YiFan Wang (Taipei, TW)
Assignee: Dell Products L.P.
G09G3/3648G09G2300/0842G09G2310/08G09G2330/021
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Quick Facts
Patent No.
US 11,676,554
App. No.
17/316,092
Granted
Jun 13, 2023
Kind
B2
Abstract

An information handling system includes a timing controller configured to transmit a command for a common voltage of a particular frame rate to a power management circuit. A storage component may store digital information, wherein each digital information is associated with the common voltage of a particular frame rate. The power management circuit supports a variety of common voltage requirements of the liquid crystal display including an ability to select digital information of the digital information that is associated with the common voltage at the particular frame rate stored in the storage component and apply the common voltage at the particular frame rate to the liquid crystal display.

Claims (29)

1. A hardware liquid crystal display comprising:

a hardware timing controller integrated circuit configured to transmit a command for a common voltage of a corresponding refresh rate to a hardware power management integrated circuit when the hardware timing controller integrated circuit intends to operate the hardware liquid crystal display at a refresh rate, wherein the common voltage is determined at manufacture, and wherein the corresponding refresh rate of the common voltage matches the refresh rate that the hardware liquid crystal display is to operate;

a hardware non-volatile storage device configured to store a plurality of digital information, wherein each digital information is associated with a particular common voltage of a particular refresh rate including the common voltage of the corresponding refresh; and

the hardware power management integrated circuit configured to in response to the command, select the digital information from the plurality of digital information and convert the digital information to the common voltage at the corresponding refresh rate and apply to the hardware liquid crystal display.

2. The hardware liquid crystal display of claim 1 , wherein the hardware timing controller integrated circuit is configured to transmit the command to the hardware power management integrated circuit in response to a request from a hardware graphics controller integrated circuit.

3. The hardware liquid crystal display of claim 2 , wherein the hardware timing controller integrated circuit is configured to determine whether to transmit the command for the common voltage of the corresponding refresh rate based on the request from the hardware graphics controller integrated circuit and a current common voltage applied at the hardware liquid crystal display.

4. The hardware liquid crystal display of claim 1 , wherein the hardware timing controller integrated circuit is configured to determine whether a pixel voltage at the hardware liquid crystal display is unbalanced.

5. The hardware liquid crystal display of claim 4 , wherein the hardware timing controller integrated circuit is configured to transmit the command to the hardware power management integrated circuit in response to a determination that the pixel voltage at the hardware liquid crystal display is unbalanced.

6. The hardware liquid crystal display of claim 1 , wherein the hardware power management integrated circuit is further configured to apply a default common voltage to the hardware liquid crystal display if the command is not received from the hardware timing controller integrated circuit.

7. The hardware liquid crystal display of claim 1 , wherein the hardware power management integrated circuit is configured to generate the common voltage of the corresponding refresh rate based on the digital information.

8. The hardware liquid crystal display of claim 1 , wherein the hardware non-volatile storage device is a flash memory.

9. A method comprising:

receiving, by a hardware power management integrated circuit, a command for a common voltage of a corresponding refresh rate when a hardware timing controller integrated circuit intends to operate a hardware liquid crystal display device at a refresh rate, wherein the corresponding refresh rate of the common voltage matches the refresh rate that the hardware liquid crystal display device is to operate, and wherein the common voltage is determined at manufacture;

in response to the command, selecting digital information from a plurality of digital information and convert the digital information to the common voltage of the corresponding refresh rate; and

applying the common voltage of the corresponding refresh rate to the hardware liquid crystal display device.

10. The method of claim 9 , further comprising transmitting the command to the hardware power management integrated circuit in response to a request from a hardware graphics controller integrated circuit.

11. The method of claim 10 , determining whether to transmit the command for the common voltage of the corresponding refresh rate based on the request from the hardware graphics controller integrated circuit and a current common voltage applied at the hardware liquid crystal display device.

12. The method of claim 9 , further comprising determining whether a pixel voltage at the hardware liquid crystal display device is unbalanced.

13. The method of claim 12 , further comprising if the pixel voltage at the hardware liquid crystal display device is unbalanced, then transmitting the command to the hardware power management integrated circuit in response to a determination that the pixel voltage at the hardware liquid crystal display device is unbalanced.

14. The method of claim 9 , further comprising applying a default common voltage to the hardware liquid crystal display device if the command is not received from the hardware timing controller integrated circuit.

15. The method of claim 9 , further comprising generating the common voltage of the corresponding refresh rate based on the digital information.

16. A non-transitory computer-readable medium including code that when executed performs a method, the method comprising:

receiving a command for a common voltage of a corresponding refresh rate when a hardware timing controller integrated circuit intends to operate a hardware liquid crystal display at a refresh rate, wherein the corresponding refresh rate of the common voltage matches the refresh rate that the hardware liquid crystal display is to operate, and wherein the common voltage is determined at manufacture;

in response to the command, selecting digital information from a plurality of digital information that corresponds to the common voltage of the corresponding refresh rate; and

applying the common voltage of the corresponding refresh rate to the hardware liquid crystal display.

17. The method of claim 16 , further comprising transmitting the command to a hardware power management integrated circuit in response to a request from a hardware graphics controller integrated circuit.

18. The method of claim 16 , further comprising determining whether a pixel voltage at the hardware liquid crystal display is unbalanced.

19. The method of claim 18 , further comprising if the pixel voltage at the hardware liquid crystal display is unbalanced, then transmitting the command to a hardware power management integrated circuit in response to a determination that the pixel voltage at the hardware liquid crystal di splay is unbalanced.

20. The method of claim 16 , further comprising generating the common voltage of the corresponding refresh rate based on the digital information.

Assignments (8)
RELEASE OF SECURITY INTEREST IN PATENTS PREVIOUSLY RECORDED AT REEL/FRAME (058014/0560) Recorded Jun 10, 2022
From: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS NOTES COLLATERAL AGENT
To: DELL PRODUCTS L.P.; EMC IP HOLDING COMPANY LLC
Reel/Frame 062022/0473 →
RELEASE OF SECURITY INTEREST IN PATENTS PREVIOUSLY RECORDED AT REEL/FRAME (057931/0392) Recorded Jun 10, 2022
From: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS NOTES COLLATERAL AGENT
To: DELL PRODUCTS L.P.; EMC IP HOLDING COMPANY LLC
Reel/Frame 062022/0382 →
RELEASE OF SECURITY INTEREST IN PATENTS PREVIOUSLY RECORDED AT REEL/FRAME (057758/0286) Recorded Jun 10, 2022
From: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS NOTES COLLATERAL AGENT
To: DELL PRODUCTS L.P.; EMC IP HOLDING COMPANY LLC
Reel/Frame 061654/0064 →
SECURITY INTEREST Recorded Oct 6, 2021
From: DELL PRODUCTS L.P.; EMC IP HOLDING COMPANY LLC
To: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS NOTES COLLATERAL AGENT
Reel/Frame 058014/0560 →
SECURITY INTEREST Recorded Oct 6, 2021
From: DELL PRODUCTS L.P.; EMC IP HOLDING COMPANY LLC
To: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS NOTES COLLATERAL AGENT
Reel/Frame 057758/0286 →
SECURITY INTEREST Recorded Oct 6, 2021
From: DELL PRODUCTS L.P.; EMC IP HOLDING COMPANY LLC
To: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS NOTES COLLATERAL AGENT
Reel/Frame 057931/0392 →
SECURITY AGREEMENT Recorded Oct 1, 2021
From: DELL PRODUCTS, L.P.; EMC IP HOLDING COMPANY LLC
To: CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH
Reel/Frame 057682/0830 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 10, 2021
From: HUANG, CHAOKAI; BOICE, DAN ODELL; HUNG, MENGFENG; CHEN, CHINGFENG; WANG, YIFAN
To: DELL PRODUCTS, LP
Reel/Frame 056189/0547 →
Continuity (1)
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