Display Device Sensing Block Pixel Compensation
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Solution Overview
Problem
Existing display devices face limitations in accurately compensating for characteristic deviations in driving transistors, leading to non-uniform current supply to light emitting elements, which affects image quality due to sensing channel deviations and heat-generated issues in external compensation methods.
Innovation Solution
A display device that includes a sensing block generating multiple types of sensing data during different periods, using initial, initialization, and reference voltages to compensate image data through a timing controller, which removes deviations in sensing channels and the data driver, ensuring uniform current supply to pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external compensation method is used to sense pixel characteristics, then pixel characteristic deviation can be compensated, but sensing accuracy deteriorates due to sensing channel deviation and heat generation
Solution Approach 1:
The sensing operation is divided into two distinct phases: a first sensing period before pixel driving to sense initial sensing channel characteristics, and a second sensing period during pixel driving to sense pixel characteristics. This segmentation allows separate compensation for sensing channel deviations and pixel characteristic deviations, improving overall sensing accuracy and image quality uniformity.
Solution Approach 2:
The sensing of initial sensing channel characteristics is performed in advance before the pixel driving operation. This preliminary sensing allows the system to pre-compensate for sensing channel deviations, ensuring that subsequent pixel characteristic sensing is not affected by channel variations, thereby improving measurement precision.
2Productivity
If sensing is performed during pixel driving, then real-time compensation is achieved, but sensing accuracy deteriorates due to heat generation and driver deviation
Solution Approach 1:
An auxiliary sensing channel is introduced as an intermediary element that mirrors the characteristics of the main sensing channels. During the second sensing period, the auxiliary sensing channel senses characteristics in response to a reference voltage, providing a reference value that compensates for heat-generated deviations and driver variations, thereby maintaining sensing accuracy during real-time operation.
Solution Approach 2:
The system changes the voltage parameter applied to the auxiliary sensing channel during the second sensing period, using a reference voltage that is distinct from the initial channel voltage. This parameter change allows the auxiliary sensing channel to capture deviations caused by heat and driver characteristics, which are then used to correct the pixel characteristic measurements.
3Measurement precision
If multiple sensing periods are used to compensate for different deviations, then sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The auxiliary sensing channel serves multiple functions: it senses initial characteristics during the first sensing period and senses reference characteristics during the second sensing period. This multi-functionality allows a single channel structure to support complex compensation operations, reducing the need for additional dedicated sensing channels and thereby limiting the increase in device complexity.
Solution Approach 2:
The sensing operations for initial channel characteristics and pixel characteristics are merged into a unified sensing framework that uses the same sensing block and auxiliary sensing channel. By combining these operations and using the auxiliary channel for both reference sensing and pixel sensing, the system achieves high measurement precision without proportionally increasing device complexity.
Data Source
AI summary
A display device includes pixels; a sensing block generating first sensing data during a first sensing period, and generating second sensing data and third sensing data during a second sensing period; and a timing controller compensating first image data with second image data based on the first sensing data, the second sensing data, and the third sensing data. The sensing block generates the first sensing data corresponding to an initial channel voltage applied to each of sensing channels and at least one auxiliary sensing channel during the first sensing period, generates the second sensing data by sensing characteristic information of the pixels corresponding to an initialization voltage applied to the pixels during the second sensing period, and generates the third sensing data corresponding to a reference voltage applied to the at least one auxiliary sensing channel during the second sensing period.