Pixel Circuit Segmentation for High Resolution Display Substrates
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Solution Overview
Problem
Current display technologies face challenges in achieving high resolution and improved display effects, particularly in flexible display apparatuses using OLED or QLED light emitting devices.
Innovation Solution
The proposed display substrate incorporates a display region with M1 rows and N1 columns of pixel circuits and M2 rows and N2 columns of light emitting units, each unit comprising three light emitting devices of different colors. Each pixel circuit is connected to K light emitting devices of the same color, featuring a current control sub-circuit and a light emitting selection sub-circuit to manage the drive current and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each pixel circuit is connected with multiple light emitting devices of the same color (K≥2), then the resolution and display effect are improved, but the device complexity and control difficulty increase
Solution Approach 1:
The control function is segmented into two independent sub-circuits: current control sub-circuit that manages drive current for all K light emitting devices, and light emitting selection sub-circuit that sequentially selects which device receives the signal. This segmentation allows complex multi-device control to be broken down into manageable functional modules.
Solution Approach 2:
The light emitting selection sub-circuit performs preliminary selection of which light emitting device should be activated before the current control sub-circuit delivers the drive current. This sequential selection mechanism (using selection signal terminals EM1 to EMK) prevents simultaneous activation of multiple devices and simplifies the timing control requirements.
2Measurement precision
If the number of light emitting units per pixel circuit is increased, then the display resolution is improved, but the current control and signal distribution become more complex
Solution Approach 1:
The current control sub-circuit serves a universal function by providing drive current to all K light emitting devices regardless of which specific device is selected. This universal current supply mechanism simplifies the design compared to having separate current control paths for each device, as the same circuit handles all K devices through the selection mechanism.
Solution Approach 2:
The light emitting selection sub-circuit acts as an intermediary between the signal source and the K light emitting devices. It receives the signal from the first node and selectively transmits it to the appropriate device based on selection signals, thereby managing the complexity of signal distribution to multiple devices systematically.
Data Source
AI summary
Disclosed are a display substrate and a display apparatus, the display substrate includes a display region and a non-display region, the display region is provided with a pixel circuit and a light emitting unit; each pixel circuit is connected with K light emitting devices emitting light of a same color; each pixel circuit includes a current control sub-circuit and a light emitting selection sub-circuit; the current control sub-circuit is configured to provide a drive current to a first node under control of a reset signal terminal, an initial signal terminal, a scan signal terminal, a data signal terminal, a light emitting control terminal, and a first power supply terminal; the light emitting selection sub-circuit is configured to sequentially provide a signal of the first node to the K light emitting devices emitting light of the same color under control of K light emitting selection signal terminals.