Display Device Reference Voltage Ripple Compensation
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Solution Overview
Problem
Display devices face challenges in accurately expressing desired gray levels due to ripple components caused by delayed compensation of reference voltages, leading to inaccurate representation of images.
Innovation Solution
A display device with a reference voltage controller that compensates the reference voltage in synchronization with the rising edge of the source output enable signal, using a buck DC-DC converter or buffer circuit to adjust the voltage level and prevent ripples, ensuring accurate gray level representation by offsetting changes in the reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference voltage is compensated with a delay, then the compensation can be performed, but a ripple component remains between the time when the voltage level of the reference voltage is changed and the time when the compensation is performed
Solution Approach 1:
The reference voltage level is changed in advance during the period when the data voltage is changed from peak black gray level to the image data voltage, before the actual compensation is needed. This preliminary action ensures that when compensation occurs, the reference voltage is already at the appropriate level, eliminating ripples caused by delayed compensation.
Solution Approach 2:
The patent applies beforehand cushioning by pre-adjusting the reference voltage level during the data voltage transition period. This cushioning action prepares the reference voltage in advance to offset any potential ripples that might occur during subsequent compensation operations, ensuring smooth voltage transitions.
2Measurement precision
If the reference voltage level is changed in response to image data voltage, then gray level accuracy is improved, but ripples may occur during the transition period
Solution Approach 1:
The reference voltage level is changed in advance during the period when the data voltage is changed from peak black gray level to the image data voltage. This preliminary action ensures that the reference voltage is already adjusted before compensation is needed, achieving accurate gray level representation without causing ripples.
Solution Approach 2:
The patent uses feedback by monitoring the data voltage changes and automatically adjusting the reference voltage level in response. The reference voltage controller detects when data voltage transitions occur and相应地 adjusts the reference voltage to maintain accurate gray level representation while preventing ripples.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate expression of desired gray levels by compensating the reference voltage without delay, preventing or reducing ripples and ensuring consistent voltage levels, thereby improving image quality.
Implementation Method 1
the reference voltage controller may compensate the reference voltage in synchronization with the rising edge of the source output enable signal
Implementation Method 2
using a buck DC-DC converter or buffer circuit to adjust the voltage level
Data Source
AI summary
A display device includes: a pixel unit including a plurality of pixels; a data driver configured to supply a data voltage to the pixels through data lines based on a source output enable signal; and a reference voltage controller configured to supply a reference voltage to the pixels through reference voltage lines, wherein each of the pixels includes a light emitting element between a first power source line and a second power source line, and wherein the reference voltage controller is configured to compensate for the reference voltage based on the source output enable signal, and to supply a compensated reference voltage to an anode electrode of the light emitting element.