US 11,056,073 B2
Display device and reference voltage generation method
Yu-jen Chen, Chongqing (CN)
Assigned to HKC CORPORATION LIMITED, Shenzhen (CN); and CHONGQING HKC OPTOELECTRONICS TECHNOLOGY CO., LTD., Chongqing (CN)
Appl. No. 16/90,852
Filed by HKC Corporation Limited, Shenzhen (CN); and Chongqing HKC Optoelectronics Technology Co.,ltd., Chongqing (CN)
PCT Filed Dec. 12, 2017, PCT No. PCT/CN2017/115715
§ 371(c)(1), (2) Date Oct. 3, 2018,
PCT Pub. No. WO2018/192240, PCT Pub. Date Oct. 25, 2018.
Claims priority of application No. 201710258778.6 (CN), filed on Apr. 19, 2017.
Prior Publication US 2021/0035522 A1, Feb. 4, 2021
Int. Cl. G09G 3/36 (2006.01); G05F 3/24 (2006.01)
CPC G09G 3/3696 (2013.01) [G05F 3/24 (2013.01); G09G 3/3648 (2013.01); G09G 2310/08 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A display device, comprising:
a display area,
a fan-out area, and
a reference voltage generation circuit formed in the fan-out area,
wherein the reference voltage generation circuit comprises:
a multi-voltage conversion module, configured to: input a first direct current voltage and a second direct current voltage, and output multiple third direct current voltages having different voltage values, wherein the first direct current voltage and the second direct current voltage are both larger than zero;
a latch module, configured to: input multiple latch signals and gating signals, and output corresponding switch control signals according to the input multiple latch signals and gating signals; and
a gating switch matrix, having a plurality of switch branches for controlling output of the multiple third direct current voltages, configured to: turn on corresponding switch branches according to the switch control signals when the switch control signals are received, so as to output the third direct current voltages having corresponding voltage values, wherein
the multi-voltage conversion module comprises N voltage divider resistors which are sequentially connected in serial between first input ends and second input ends of the multi-voltage conversion module,
the N voltage divider resistors divide a difference value between the first direct current voltage and the second direct current voltage into N+1 voltage values and output the N+1 voltage values as the third direct current voltages,
a quantity of the switch branches is N+1, and each of the N+1 switch branches has M serially connected switching tubes, so as to form the gating switch matrix having M rows and (N+1) columns, wherein N=2M−1,
in response that the latch signals are at a first level, the latch module outputs a gating signal input as a switch control signal, and
in response that the latch signals are at a second level, the latch module outputs a previous switch control signal as the switch control signal.