AMOLED DISPLAY PANEL AND IMAGE DISPLAY DEVICE

• US 20200135116A1
• Filed: 12/30/2019
• Published: 04/30/2020
• Est. Priority Date: 11/20/2017
• Status: Active Grant

• Current Assignee: Seeya Optronics Company Limited
• Original Assignee: Shanghai Seeo Optronics Technology Co., Ltd.
• Inventors: QIAN, Dong, GU, Tieer, WU, Tong, LI, Qi
• Granted Patent: US 10,885,851 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0828 forming a digital to analog [D/A] conversion circuit
• CPC Class Codes: G09G 2310/0259 with use of an analog or digital ramp generator in the column driver or in the pixel circuit
• 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 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

An AMOLED display panel includes a pixel display array including a plurality of pixel circuits arranged in an array. A gate driving circuit is adapted to provide a gate scan signal to the pixel circuits. The gate scan signal is used to control an operation stage of the pixel circuits. A source driving circuit is provided with a digital video signal and adapted to generate a data voltage in accordance with the digital video signal. The data voltage is used to control a light-emitting state of a light-emitting element in the plurality of pixel circuits. The pixel display array, the gate driving circuit and the source driving circuit are integrated on the same chip substrate. The source driving circuit is adapted to be coupled to a panel control circuit external to the chip substrate.

Claims

1. An AMOLED display panel, comprising:

a pixel display array comprising a plurality of pixel circuits arranged in an array;

a gate driving circuit adapted to provide a gate scan signal to the plurality of pixel circuits, the gate scan signal being used to control an operation stage of the plurality of pixel circuits; and

a source driving circuit provided with a digital video signal and adapted to generate a data voltage in accordance with the digital video signal, the data voltage being used to control a light-emitting state of a light-emitting element in the plurality of pixel circuits,

wherein the pixel display array, the gate driving circuit and the source driving circuit are integrated on a same chip substrate, and the source driving circuit is adapted to be coupled to a panel control circuit external to the chip substrate.

2. The AMOLED display panel according to claim 1, wherein the panel control circuit comprises one or more of a power module, a clock module, or a voltage reference module.

3. The AMOLED display panel according to claim 1, wherein the source driving circuit comprises:

a ramp Digital-to-Analog Converter adapted to output a first ramp voltage, the first ramp voltage varying linearly with a preset step over time within a preset voltage range; and

a first data strobe circuit provided with i associated digital video signals and adapted to respectively generate a corresponding data strobe signal based on each of the associated digital video signals at a first moment associated with a value of the associated digital video signals, each of the associated digital video signals being associated with a digital video signal, the data strobe signal being used to strobe the first ramp voltage to be directly or indirectly used as a data voltage, and the data voltage being used to control a display state of the plurality of pixel circuits in the display panel,

wherein the ramp Digital-to-Analog Converter is of M bits, and a bit number of the respective digital video signal is N, wherein M≤

N, and wherein i, M and N are positive integers.

4. The AMOLED display panel according to claim 3, wherein M=N, and the first ramp voltage varies in a linearly increasing manner;

and the first data strobe circuit comprises;

a counter;

i numerical comparators adapted to respectively compare a counting result of the counter with a value of a corresponding one of the associated digital video signals and generate a corresponding data strobe signal when the counting result and the value are equal; and

i first switches, each of the i first switches having a first terminal provided with the first ramp voltage and a second terminal outputting the data voltage, and each of the i first switches being turned on in response to the data strobe signal.

5. The AMOLED display panel according to claim 3, wherein M=N, and the source driving circuit further comprises:

a data extension module adapted to map the respective digital video signal having a bit number of N to an extended digital video signal having N+P bits according to a preset lookup table, where P is a positive integer;

i step adjustment modules adapted to perform an amplitude adjustment on the first ramp voltage to obtain a corresponding second ramp voltage in such a manner that an amplitude of the second ramp voltage is equal to a value obtained by the first ramp voltage minus the preset step plus a product of the preset step and a voltage-division factor, where the voltage-division factor is one of 2^P sub-voltage-division factors, the 2^P sub-voltage-division factors are in an arithmetic progression with a first term of 0 and a tolerance of 1/2^P; and

a control signal generation module adapted to control a magnitude of the voltage-division factor in each of the i step adjustment modules according to low P bits of the extended digital video signal,

wherein the associated digital video signal is high N bits of the extended digital video signal, and the second ramp voltage is used as the data voltage.

6. The AMOLED display panel according to claim 5, wherein

each of the i step adjustment modules comprises a second data strobe circuit and a weighted resistor divider network;

the second data strobe circuit is provided with the first ramp voltage and adapted to be turned on at a second moment to transmit the first ramp voltage of the second moment to a second input terminal of the weighted resistor divider network, and the second moment is a moment associated with a value of the high N bits of the extended digital video signal minus 1; and

a first input terminal of the weighted resistor divider network is coupled to an output terminal of the first data strobe circuit, so that the first input terminal of the weighted resistor divider network is provided with the first ramp voltage corresponding to the first moment;

the weighted resistor divider network is adapted to perform, based on the first ramp voltage at the second moment, voltage-division on the preset step according to the voltage-division factor, to obtain the second ramp voltage.

7. The AMOLED display panel according to claim 3, wherein

M+P=N;

P is a positive integer;

the associated digital video signal is high M bits of the digital video signal; and

the source driving circuit further comprises;

i step adjustment modules adapted to perform an amplitude adjustment on the first ramp voltage to obtain a corresponding second ramp voltage such that an amplitude of the second ramp voltage is equal to a value obtained by the first ramp voltage minus the preset step plus a product of the preset step and a voltage-division factor, where the voltage-division factor is one of 2^P sub-voltage-division factors, and the 2^P sub-voltage-division factors are in an arithmetic progression with a first term of 0 and a tolerance of 1/2^P; and

a control signal generation module adapted to control a magnitude of the voltage-division factor in the respective step adjustment module according to low P bits of the digital video signal,

wherein the second ramp voltage is used as the data voltage.

8. The AMOLED display panel according to claim 7, wherein

each of the i step adjustment modules comprises a second data strobe circuit and a weighted resistor divider network;

the second data strobe circuit is provided with the first ramp voltage and is adapted to be turned on at a second moment to transmit the first ramp voltage of the second moment to a second input terminal of the weighted resistor divider network, and the second moment is a moment associated with a value of the high M bits of the digital video signal minus 1;

a first input terminal of the weighted resistor divider network is coupled to an output terminal of the first data strobe circuit, so that the first input terminal of the weighted resistor divider network is provided with the first ramp voltage corresponding to the first moment; and

the weighted resistor divider network is adapted to perform, based on the first ramp voltage at the second moment, voltage-division on the preset step according to the voltage-division factor to obtain the second ramp voltage.

9. The AMOLED display panel according to claim 7, wherein the source driving circuit further comprises a numerical value extraction module adapted to extract values of the high M bits and the low P bits of the respective digital video signal.

10. The AMOLED display panel according to claim 6, wherein the weighted resistor divider network comprises:

2^P voltage-division resistors sequentially connected end to end, a first terminal of a first voltage-division resistor being coupled to the output terminal of the first data strobe circuit, and a second terminal of a last voltage-division resistor being coupled to an output terminal of the second data strobe circuit;

2^P second switches, a first terminal of a j^th second switch being coupled to a second terminal of a j^th voltage-division resistor, where 1≤

j≤

2^P, and a second terminal of a k^th second switch being coupled to a second terminal of a (k+1)^th second switch, where k is an odd number, and 1≤

k≤

2^P−

1; and

2<sup>P−

1</sup> third switches, a first terminal of a m^th third switch being coupled to a second terminal of a (2×

m−

1)^th second switch, where 1≤

m≤

2<sup>P−

1</sup>, and second terminals of the 2<sup>P−

1</sup> third switches being coupled to output the second ramp voltage.

11. An image display device, comprising the AMOLED display panel according to claim 1 and the panel control circuit external to the chip substrate.